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The basking shark had the lowest TP (3·1) and δ15N value (10·4‰), whereas the thresher shark had the highest values (4·5, 15·2‰). Mako sharks showed considerable variation in TP and isotopic values, possibly due to foraging from both inshore and offshore waters. Thresher sharks were significantly more enriched in δ15N than blue sharks and mako sharks, suggesting a different prey base. The δ13C values of thresher sharks and mako sharks varied significantly, but neither was significantly different from that of blue sharks. No statistical differences were found between our TP estimations and those derived from published stomach contents analyses, indicating that stable isotope data may be used to estimate the trophic status of sharks.","author":[{"@context":"https://schema.org","@type":"Person","name":"Aaron Rice"}],"contributor":[],"dateCreated":"2014-10-22","dateModified":"2014-10-22","datePublished":null,"headline":"Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis","inLanguage":"en","keywords":["Feeding Ecology","Sharks"],"locationCreated":null,"publication":null,"publisher":{"@context":"https://schema.org","@type":"Organization","name":null},"image":null,"thumbnailUrl":null,"url":"https://www.academia.edu/8911523/Predicting_trophic_position_in_sharks_of_the_north_west_Atlantic_Ocean_using_stable_isotope_analysis","sourceOrganization":[{"@context":"https://schema.org","@type":"EducationalOrganization","name":"cornell"}]}</script><link rel="stylesheet" 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"https://www.academia.edu/login?post_login_redirect_url=https%3A%2F%2Fwww.academia.edu%2F8911523%2FPredicting_trophic_position_in_sharks_of_the_north_west_Atlantic_Ocean_using_stable_isotope_analysis%3Fauto%3Ddownload"; window.loswp.translateUrl = "https://www.academia.edu/login?post_login_redirect_url=https%3A%2F%2Fwww.academia.edu%2F8911523%2FPredicting_trophic_position_in_sharks_of_the_north_west_Atlantic_Ocean_using_stable_isotope_analysis%3Fshow_translation%3Dtrue"; window.loswp.previewableAttachments = [{"id":35238187,"identifier":"Attachment_35238187","shouldShowBulkDownload":false}]; window.loswp.shouldDetectTimezone = true; window.loswp.shouldShowBulkDownload = true; window.loswp.showSignupCaptcha = false window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":8911523,"created_at":"2014-10-22T09:41:51.085-07:00","from_world_paper_id":null,"updated_at":"2021-01-14T18:19:13.899-08:00","_data":{"abstract":"Trophic positions (TP) were estimated for the blue shark (Prionace glauca), shortfin mako (Isurus oxyrinchus), thresher shark (Alopias vulpinus), and basking shark (Cetorhinus maximus) using stable isotope ratios of carbon (δ13C) and nitrogen (δ15N). The basking shark had the lowest TP (3·1) and δ15N value (10·4‰), whereas the thresher shark had the highest values (4·5, 15·2‰). Mako sharks showed considerable variation in TP and isotopic values, possibly due to foraging from both inshore and offshore waters. Thresher sharks were significantly more enriched in δ15N than blue sharks and mako sharks, suggesting a different prey base. The δ13C values of thresher sharks and mako sharks varied significantly, but neither was significantly different from that of blue sharks. No statistical differences were found between our TP estimations and those derived from published stomach contents analyses, indicating that stable isotope data may be used to estimate the trophic status of sharks."},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis","broadcastable":true,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [85871]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loswp.appleClientId = 'edu.academia.applesignon';</script><script defer="" src="https://accounts.google.com/gsi/client"></script><div class="ds-loswp-container"><div class="ds-work-card--grid-container"><div class="ds-work-card--container js-loswp-work-card"><div class="ds-work-card--cover"><div class="ds-work-cover--wrapper"><div class="ds-work-cover--container"><button class="ds-work-cover--clickable js-swp-download-button" data-signup-modal="{"location":"swp-splash-paper-cover","attachmentId":35238187,"attachmentType":"pdf"}"><img alt="First page of “Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis”" class="ds-work-cover--cover-thumbnail" src="https://0.academia-photos.com/attachment_thumbnails/35238187/mini_magick20190316-1134-rvz6bl.png?1552773338" /><img alt="PDF Icon" class="ds-work-cover--file-icon" src="//a.academia-assets.com/assets/single_work_splash/adobe.icon-574afd46eb6b03a77a153a647fb47e30546f9215c0ee6a25df597a779717f9ef.svg" /><div class="ds-work-cover--hover-container"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span><p>Download Free PDF</p></div><div class="ds-work-cover--ribbon-container">Download Free PDF</div><div class="ds-work-cover--ribbon-triangle"></div></button></div></div></div><div class="ds-work-card--work-information"><h1 class="ds-work-card--work-title">Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis</h1><div class="ds-work-card--work-authors ds-work-card--detail"><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="85871" href="https://cornell.academia.edu/AaronRice"><img alt="Profile image of Aaron Rice" class="ds-work-card--author-avatar" src="https://0.academia-photos.com/85871/2816415/11310789/s65_aaron.rice.png" />Aaron Rice</a></div><div class="ds-work-card--detail"></div><p class="ds-work-card--work-abstract ds-work-card--detail ds2-5-body-md">Trophic positions (TP) were estimated for the blue shark (Prionace glauca), shortfin mako (Isurus oxyrinchus), thresher shark (Alopias vulpinus), and basking shark (Cetorhinus maximus) using stable isotope ratios of carbon (δ13C) and nitrogen (δ15N). The basking shark had the lowest TP (3·1) and δ15N value (10·4‰), whereas the thresher shark had the highest values (4·5, 15·2‰). Mako sharks showed considerable variation in TP and isotopic values, possibly due to foraging from both inshore and offshore waters. Thresher sharks were significantly more enriched in δ15N than blue sharks and mako sharks, suggesting a different prey base. The δ13C values of thresher sharks and mako sharks varied significantly, but neither was significantly different from that of blue sharks. No statistical differences were found between our TP estimations and those derived from published stomach contents analyses, indicating that stable isotope data may be used to estimate the trophic status of sharks.</p><div class="ds-work-card--button-container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--work-card","attachmentId":35238187,"attachmentType":"pdf","workUrl":"https://www.academia.edu/8911523/Predicting_trophic_position_in_sharks_of_the_north_west_Atlantic_Ocean_using_stable_isotope_analysis"}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--work-card","attachmentId":35238187,"attachmentType":"pdf","workUrl":"https://www.academia.edu/8911523/Predicting_trophic_position_in_sharks_of_the_north_west_Atlantic_Ocean_using_stable_isotope_analysis"}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div></div><div data-auto_select="false" data-client_id="331998490334-rsn3chp12mbkiqhl6e7lu2q0mlbu0f1b" data-doc_id="35238187" data-landing_url="https://www.academia.edu/8911523/Predicting_trophic_position_in_sharks_of_the_north_west_Atlantic_Ocean_using_stable_isotope_analysis" data-login_uri="https://www.academia.edu/registrations/google_one_tap" data-moment_callback="onGoogleOneTapEvent" id="g_id_onload"></div><div class="ds-top-related-works--grid-container"><div class="ds-related-content--container ds-top-related-works--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="0" data-entity-id="35691644" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/35691644/Stable_Isotope_Applications_for_Understanding_Shark_Ecology_in_the_Northeast_Pacific_Ocean">Stable Isotope Applications for Understanding Shark Ecology in the Northeast Pacific Ocean</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="74685564" href="https://independent.academia.edu/SaraMargaritaVasquezCastillo">Sara Margarita Vasquez Castillo</a></div><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Stable Isotope Applications for Understanding Shark Ecology in the Northeast Pacific Ocean","attachmentId":55562728,"attachmentType":"pdf","work_url":"https://www.academia.edu/35691644/Stable_Isotope_Applications_for_Understanding_Shark_Ecology_in_the_Northeast_Pacific_Ocean","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/35691644/Stable_Isotope_Applications_for_Understanding_Shark_Ecology_in_the_Northeast_Pacific_Ocean"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="1" data-entity-id="11744795" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/11744795/Population_and_individual_foraging_patterns_of_two_hammerhead_sharks_using_carbon_and_nitrogen_stable_isotopes">Population and individual foraging patterns of two hammerhead sharks using carbon and nitrogen stable isotopes</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="39950602" href="https://aunap.academia.edu/CarlosPolo">Carlos Polo</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32689505" href="https://independent.academia.edu/FGalv%C3%A1nmaga%C3%B1a">F. Galván-magaña</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4792588" href="https://independent.academia.edu/CarlosJulioPoloSilva">Carlos Julio Polo-Silva</a></div><p class="ds-related-work--abstract ds2-5-body-sm">RATIONALE: Individual foraging behavior is an important variable of predators commonly studied at the population level. Some hammerhead shark species play a significant role in the marine ecosystem as top consumers. In this context, stable isotope analysis allows us to infer some ecological metrics and patterns that cannot usually be obtained using traditional methods. METHODS: We determined the isotopic composition (δ13C and δ15N values) of dorsal muscle and vertebrae of Sphyrna lewini and Sphyrna zygaena using a continuous-flow system consisting of an elemental analyzer combined with a Delta Plus XL mass spectrometer. Foraging variability by sex and by individual was inferred from the isotopic values. RESULTS: There were no significant differences in the isotopic values of muscle samples between sexes, but there were differences between species. The trophic niche breadth of the two species was similar and overlap was low. A low niche overlap was observed between S. lewini individual vertebrae. We found differences in the δ15N values of S. zygaena vertebrae, with lower values in the first group of samples. CONCLUSIONS: Despite these hammerhead shark species inhabiting the same area, there was low trophic niche overlap between species and individuals, due to different individual foraging strategies, according to the carbon and nitrogen isotopic profiles obtained. The use of tissues that retain lifetime isotopic information is useful to complement studies on trophic ecology</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Population and individual foraging patterns of two hammerhead sharks using carbon and nitrogen stable isotopes","attachmentId":37174054,"attachmentType":"pdf","work_url":"https://www.academia.edu/11744795/Population_and_individual_foraging_patterns_of_two_hammerhead_sharks_using_carbon_and_nitrogen_stable_isotopes","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/11744795/Population_and_individual_foraging_patterns_of_two_hammerhead_sharks_using_carbon_and_nitrogen_stable_isotopes"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="2" data-entity-id="11402209" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/11402209/Trophic_ecology_of_reef_sharks_determined_using_stable_isotopes_and_telemetry">Trophic ecology of reef sharks determined using stable isotopes and telemetry</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="27739432" href="https://aims-au.academia.edu/ConradSpeed">Conrad Speed</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="27243283" href="https://imos.academia.edu/CliveMcMahon">Clive McMahon</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="66942" href="https://jamescook.academia.edu/K%C3%A1tyaAbrantes">Kátya Abrantes</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Coral Reefs, 2012</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Trophic ecology of reef sharks determined using stable isotopes and telemetry","attachmentId":46728339,"attachmentType":"pdf","work_url":"https://www.academia.edu/11402209/Trophic_ecology_of_reef_sharks_determined_using_stable_isotopes_and_telemetry","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/11402209/Trophic_ecology_of_reef_sharks_determined_using_stable_isotopes_and_telemetry"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="3" data-entity-id="104004193" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/104004193/Tissue_specific_stable_isotope_ratios_of_shortfin_mako_Isurus_oxyrinchus_and_white_Carcharodon_carcharias_sharks_as_indicators_of_size_based_differences_in_foraging_habitat_and_trophic_level">Tissue-specific stable isotope ratios of shortfin mako (Isurus oxyrinchus ) and white (Carcharodon carcharias ) sharks as indicators of size-based differences in foraging habitat and trophic level</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="275239815" href="https://independent.academia.edu/MiguelOlvera89">Miguel Olvera</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Fisheries Oceanography, 2013</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Tissue-specific stable isotope ratios of shortfin mako (Isurus oxyrinchus ) and white (Carcharodon carcharias ) sharks as indicators of size-based differences in foraging habitat and trophic level","attachmentId":103849546,"attachmentType":"pdf","work_url":"https://www.academia.edu/104004193/Tissue_specific_stable_isotope_ratios_of_shortfin_mako_Isurus_oxyrinchus_and_white_Carcharodon_carcharias_sharks_as_indicators_of_size_based_differences_in_foraging_habitat_and_trophic_level","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/104004193/Tissue_specific_stable_isotope_ratios_of_shortfin_mako_Isurus_oxyrinchus_and_white_Carcharodon_carcharias_sharks_as_indicators_of_size_based_differences_in_foraging_habitat_and_trophic_level"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="4" data-entity-id="3987764" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/3987764/Trophic_shift_in_the_diet_of_the_pelagic_thresher_shark_based_on_stomach_contents_and_stable_isotope_analyses">Trophic shift in the diet of the pelagic thresher shark based on stomach contents and stable isotope analyses</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4792588" href="https://independent.academia.edu/CarlosJulioPoloSilva">Carlos Julio Polo-Silva</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2013</p><p class="ds-related-work--abstract ds2-5-body-sm">The trophic ecology of the pelagic thresher shark (Alopias pelagicus) was analysed using stomach contents and carbon (d13C) and nitrogen (d15N) stable isotope analysis. The sharks were caught in Ecuadorian waters between June and December 2003. Approximately 24 prey species were found in the stomachs of 111 sharks. The most common species were Dosidicus gigas, Benthosema panamense and Sthenoteuthis oualaniensis. Mean (9SD) muscle isotope values of the pelagic thresher shark were 16.090.3for d13Cand 13.791.1for d15N; mean (9SD) vertebrae valueswere16.792.0 for d13Cand 9.491.8 for d15N. There were no significant sex-related differences in muscle d13Cand d15N; however, female vertebrae had significantly higher mean (9SD) d13Cvalues (16.492.0) than males (18.890.3). Inter-individual variation in d15Nvalues was observed in both tissues and was likely related to foraging in different ecosystems with distinct isotope values. Both stomach content and isotope data suggest that the pelagic thresher shark is a specialist predator in Ecuadorian waters. In general, little is known about the foraging ecology and movement patterns of this globally distributed but elusive top marine predator, and how these fundamental ecological traits vary among populations. By using two independent but complementary approaches, our study addresses these questions for the pelagic thresher sharks in Ecuadorian waters. Such information is critically important for the design of effective management strategies for these highly exploited but poorly understood predators.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Trophic shift in the diet of the pelagic thresher shark based on stomach contents and stable isotope analyses","attachmentId":31541964,"attachmentType":"pdf","work_url":"https://www.academia.edu/3987764/Trophic_shift_in_the_diet_of_the_pelagic_thresher_shark_based_on_stomach_contents_and_stable_isotope_analyses","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/3987764/Trophic_shift_in_the_diet_of_the_pelagic_thresher_shark_based_on_stomach_contents_and_stable_isotope_analyses"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="4025944" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/4025944/Trophic_shift_in_the_diet_of_the_pelagic_thresher_shark_based_on_stomach_contents_and_stable_isotopic_analyses">Trophic shift in the diet of the pelagic thresher shark based on stomach contents and stable isotopic analyses</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="3615116" href="https://utadeo.academia.edu/AdolfoSanjuan">Adolfo Sanjuan</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Marine Biology Research, 2013</p><p class="ds-related-work--abstract ds2-5-body-sm">The trophic ecology of the pelagic thresher shark (Alopias pelagicus) was analysed using stomach contents and carbon (d13C) and nitrogen (d15N) stable isotope analysis. The sharks were caught in Ecuadorian waters between June and December 2003. Approximately 24 prey species were found in the stomachs of 111 sharks. The most common species were Dosidicus gigas, Benthosema panamense and Sthenoteuthis oualaniensis. Mean (9SD) muscle isotope values of the pelagic thresher shark were 16.090.3for d13Cand 13.791.1for d15N; mean (9SD) vertebrae valueswere16.792.0 for d13Cand 9.491.8 for d15N. There were no significant sex-related differences in muscle d13Cand d15N; however, female vertebrae had significantly higher mean (9SD) d13Cvalues (16.492.0) than males (18.890.3). Inter-individual variation in d15Nvalues was observed in both tissues and was likely related to foraging in different ecosystems with distinct isotope values. Both stomach content and isotope data suggest that the pelagic thresher shark is a specialist predator in Ecuadorian waters. In general, little is known about the foraging ecology and movement patterns of this globally distributed but elusive top marine predator, and how these fundamental ecological traits vary among populations. By using two independent but complementary approaches, our study addresses these questions for the pelagic thresher sharks in Ecuadorian waters. Such information is critically important for the design of effective management strategies for these highly exploited but poorly understood predators.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Trophic shift in the diet of the pelagic thresher shark based on stomach contents and stable isotopic analyses","attachmentId":31567842,"attachmentType":"pdf","work_url":"https://www.academia.edu/4025944/Trophic_shift_in_the_diet_of_the_pelagic_thresher_shark_based_on_stomach_contents_and_stable_isotopic_analyses","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/4025944/Trophic_shift_in_the_diet_of_the_pelagic_thresher_shark_based_on_stomach_contents_and_stable_isotopic_analyses"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="48392987" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/48392987/Assessing_the_trophic_position_of_two_sharks_from_the_open_waters_of_the_southeastern_Pacific_Ocean">Assessing the trophic position of two sharks from the open waters of the southeastern Pacific Ocean</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="6904250" href="https://unab.academia.edu/PaulineSallaberryPincheira">Pauline Sallaberry Pincheira</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Latin American Journal of Aquatic Research, 2016</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Assessing the trophic position of two sharks from the open waters of the southeastern Pacific Ocean","attachmentId":67029439,"attachmentType":"pdf","work_url":"https://www.academia.edu/48392987/Assessing_the_trophic_position_of_two_sharks_from_the_open_waters_of_the_southeastern_Pacific_Ocean","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/48392987/Assessing_the_trophic_position_of_two_sharks_from_the_open_waters_of_the_southeastern_Pacific_Ocean"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="17935123" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/17935123/Short_term_shifts_of_stable_isotope_%CE%B415N_%CE%B413C_ratios_in_juvenile_sharks_within_nursery_areas_suggest_rapid_shifts_in_energy_pathways">Short-term shifts of stable isotope (δ15N, δ13C) ratios in juvenile sharks within nursery areas suggest rapid shifts in energy pathways</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32041039" href="https://independent.academia.edu/PhilMatich">Phil Matich</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="37847143" href="https://fiu.academia.edu/MichaelHeithaus">Michael Heithaus</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Experimental Marine Biology and Ecology</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Short-term shifts of stable isotope (δ15N, δ13C) ratios in juvenile sharks within nursery areas suggest rapid shifts in energy pathways","attachmentId":42031115,"attachmentType":"pdf","work_url":"https://www.academia.edu/17935123/Short_term_shifts_of_stable_isotope_%CE%B415N_%CE%B413C_ratios_in_juvenile_sharks_within_nursery_areas_suggest_rapid_shifts_in_energy_pathways","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/17935123/Short_term_shifts_of_stable_isotope_%CE%B415N_%CE%B413C_ratios_in_juvenile_sharks_within_nursery_areas_suggest_rapid_shifts_in_energy_pathways"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="3987832" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/3987832/Trophic_inferences_of_blue_shark_Prionace_glauca_in_the_Mexican_Pacific_from_stable_isotope_analysis_in_teeth">Trophic inferences of blue shark Prionace glauca in the Mexican Pacific from stable isotope analysis in teeth</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4792588" href="https://independent.academia.edu/CarlosJulioPoloSilva">Carlos Julio Polo-Silva</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2012</p><p class="ds-related-work--abstract ds2-5-body-sm">RATIONALE: Isotopic analysis of biogenic tissues such as teeth of elasmobranchs has been well recognized as an important method to interpret present and past environmental conditions. However, few studies on shark teeth have focused their attention on making trophic inferences or reconstruction of diet. METHODS:We analyzed the carbon (d13C) and nitrogen (d15N) isotope composition of the tooth crown and root from blue sharks Prionace glauca caught in southern Baja California using a continuous-flow system by means of an elemental analyzer combined with a Delta Plus XL mass spectrometer, to describe their feeding ecology, considering sex and maturity stage. RESULTS: Significant differences in d13C values for tooth root were found between immature and mature males, with depleted values of 13C in immature individuals. No statistical differences were found between maturity stages in females for both the C and N isotopes in any part of the tooth, which suggests that females were consuming the same prey in the same area. In addition, we observed significant differences in d15N values between the tooth crown and root. CONCLUSIONS: Isotopic analysis in the tooth crown (dentin) and root may represent a new tool to describe the feeding ecology of different species of elasmobranchs, showing dietary change over a short timescale</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Trophic inferences of blue shark Prionace glauca in the Mexican Pacific from stable isotope analysis in teeth","attachmentId":31542066,"attachmentType":"pdf","work_url":"https://www.academia.edu/3987832/Trophic_inferences_of_blue_shark_Prionace_glauca_in_the_Mexican_Pacific_from_stable_isotope_analysis_in_teeth","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/3987832/Trophic_inferences_of_blue_shark_Prionace_glauca_in_the_Mexican_Pacific_from_stable_isotope_analysis_in_teeth"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="81596915" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/81596915/Using_stable_isotopes_analysis_to_understand_ontogenetic_trophic_variations_of_the_scalloped_hammerhead_shark_at_the_Galapagos_Marine_Reserve">Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="3309108" href="https://darwinfoundation.academia.edu/FlorenciaCerutti">Florencia Cerutti-Pereyra</a></div><p class="ds-related-work--metadata ds2-5-body-xs">PLOS ONE, 2022</p><p class="ds-related-work--abstract ds2-5-body-sm">Changes in life-history requirements drive trophic variations, particularly in large marine predators. The life history of many shark species is still poorly known and understanding their dietary ontogeny is a challenging task, especially for highly migratory species. Stable isotope analysis has proven as a useful method for examining the foraging strategies of sharks and other marine predators. We assessed the foraging strategies and ontogenetic changes of scalloped hammerhead sharks, Sphyrna lewini, at Galapagos Marine Reserve (GMR), by analysing δ 13 C and δ 15 N signatures in different maturity stages. Our isotopic results suggest ontogenetic shifts in resource use between sub-adult and adult stages, but not between adult and juvenile stages. Carbon isotopic signatures found in the juvenile stage were enriched in contrast to sub-adults (~0.73‰) suggesting a combination of the maternal input and the use of coastal resources around the Galapagos Islands. Adult female sharks also showed enrichment in δ 13 C (~0.53‰) in comparison to sub-adult stages that suggest feeding in high primary productivity areas, such as the GMR. This study improves the understanding of the trophic ecology and ontogenetic changes of a highly migratory shark that moves across the protected and unprotected waters of the Eastern Tropical Pacific.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve","attachmentId":87586505,"attachmentType":"pdf","work_url":"https://www.academia.edu/81596915/Using_stable_isotopes_analysis_to_understand_ontogenetic_trophic_variations_of_the_scalloped_hammerhead_shark_at_the_Galapagos_Marine_Reserve","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/81596915/Using_stable_isotopes_analysis_to_understand_ontogenetic_trophic_variations_of_the_scalloped_hammerhead_shark_at_the_Galapagos_Marine_Reserve"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":35238187,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":35238187,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_35238187" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. You can download the paper by clicking the button above.</p></div></div></div></div><div class="ds-sidebar--container js-work-sidebar"><div class="ds-related-content--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="0" data-entity-id="10492747" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/10492747/Short_term_shifts_of_stable_isotope_%CE%B413C_%CE%B415N_values_in_juvenile_sharks_within_nursery_areas_suggest_rapid_shifts_in_energy_pathways">Short-term shifts of stable isotope (δ13C, δ15N) values in juvenile sharks within nursery areas suggest rapid shifts in energy pathways</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32481724" href="https://fiu.academia.edu/MHeithaus">Michael Heithaus</a><span>, </span><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="1104323" href="https://mq.academia.edu/JohannMourier">Johann Mourier</a></div><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Short-term shifts of stable isotope (δ13C, δ15N) values in juvenile sharks within nursery areas suggest rapid shifts in energy pathways","attachmentId":36505830,"attachmentType":"pdf","work_url":"https://www.academia.edu/10492747/Short_term_shifts_of_stable_isotope_%CE%B413C_%CE%B415N_values_in_juvenile_sharks_within_nursery_areas_suggest_rapid_shifts_in_energy_pathways","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/10492747/Short_term_shifts_of_stable_isotope_%CE%B413C_%CE%B415N_values_in_juvenile_sharks_within_nursery_areas_suggest_rapid_shifts_in_energy_pathways"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="1" data-entity-id="35691643" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/35691643/Trophic_habits_of_an_abundant_shark_in_the_northwestern_Mediterranean_Sea_using_an_isotopic_non_lethal_approach">Trophic habits of an abundant shark in the northwestern Mediterranean Sea using an isotopic non-lethal approach</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="74685564" href="https://independent.academia.edu/SaraMargaritaVasquezCastillo">Sara Margarita Vasquez Castillo</a></div><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Trophic habits of an abundant shark in the northwestern Mediterranean Sea using an isotopic non-lethal approach","attachmentId":55562733,"attachmentType":"pdf","work_url":"https://www.academia.edu/35691643/Trophic_habits_of_an_abundant_shark_in_the_northwestern_Mediterranean_Sea_using_an_isotopic_non_lethal_approach","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/35691643/Trophic_habits_of_an_abundant_shark_in_the_northwestern_Mediterranean_Sea_using_an_isotopic_non_lethal_approach"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="2" data-entity-id="113165439" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/113165439/Data_from_A_global_perspective_on_the_trophic_geography_of_sharks">Data from: A global perspective on the trophic geography of sharks</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4792588" href="https://independent.academia.edu/CarlosJulioPoloSilva">Carlos Julio Polo-Silva</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2018</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Data from: A global perspective on the trophic geography of sharks","attachmentId":110196572,"attachmentType":"pdf","work_url":"https://www.academia.edu/113165439/Data_from_A_global_perspective_on_the_trophic_geography_of_sharks","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/113165439/Data_from_A_global_perspective_on_the_trophic_geography_of_sharks"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="3" data-entity-id="12826876" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/12826876/Diet_and_tissue_specific_incorporation_of_isotopesin_the_shark_Scyliorhinus_stellaris_a_North_Sea_mesopredator"> Diet-and tissue-specific incorporation of isotopesin the shark Scyliorhinus stellaris , a North Sea mesopredator</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="8332855" href="https://independent.academia.edu/MichaelJowers">Michael Jowers</a><span>, </span><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="31924539" href="https://ulg.academia.edu/GillesLepoint">Gilles Lepoint</a><span>, </span><a 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href="https://myulg.academia.edu/KrishnaDas">Krishna Das</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Marine Environmental Research, 2005</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Feeding ecology of five commercial shark species of the Celtic Sea through stable isotope and trace metal analysis","attachmentId":102636148,"attachmentType":"pdf","work_url":"https://www.academia.edu/102340024/Feeding_ecology_of_five_commercial_shark_species_of_the_Celtic_Sea_through_stable_isotope_and_trace_metal_analysis","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" 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