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(PDF) Octopus insularis (Octopodidae), evidences of a specialized predator and a time-minimizing hunter | Jennifer Mather - Academia.edu
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[{"id":116921938,"identifier":"Attachment_116921938","shouldShowBulkDownload":false}]; window.loswp.shouldDetectTimezone = true; window.loswp.shouldShowBulkDownload = true; window.loswp.showSignupCaptcha = false window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":122208013,"created_at":"2024-07-20T09:21:54.668-07:00","from_world_paper_id":257435133,"updated_at":"2024-11-27T01:02:46.682-08:00","_data":{"publisher":"Springer Science and Business Media LLC","ai_title_tag":"Feeding Ecology and Foraging Behavior of Octopus insularis","grobid_abstract":"Shallow-water octopuses have been reported as major predators of motile species in benthonic marine communities, capturing their prey by diVerent foraging techniques. This study assessed for the Wrst time the feeding ecology, foraging behavior, and defensive strategy during foraging, including the use of body patterns, to construct a general octopus foraging strategy in a shallow water-reef system. Octopus insularis was studied in situ using visual observations and video recordings. The diet included at least 55 species of crustaceans (70%), bivalves (17.5%), and gastropods (12.5%); however, only four species accounted for half of the occurrences: the small crabs Pitho sp. (26.8%) and Mithrax forceps (23.9%), the bivalve Lima lima (5.3%), and the gastropod Pisania pusio (4.9%). Poke and crawl were most frequent foraging behaviors observed in the video recordings. The foraging behaviors were associated with environmental variables and octopus body size. The sequences of foraging behavior showed characteristics of a tactile saltatory searching predator, as well as a visual opportunist. Body patterns showed a relationship with foraging behavior, habitat variables, and octopus body size. Mottle was the most frequent pattern, especially during poke and crawl, in shallower depths. Dorsal light-ventral blue green was more frequent during swimming at midwater, and Blotch was the normal pattern during web-over by large animals. The large proportion of two species of small crabs in den remains, the intense search for food during short hunting trips, and the intense use of cryptic body patterns during foraging trips, suggest that this species is a 'time-minimizing' forager instead of a 'rate-maximizer'.","publication_date":"2009,,","publication_name":"Marine Biology","grobid_abstract_attachment_id":"116921938"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Octopus insularis (Octopodidae), evidences of a specialized predator and a time-minimizing hunter","broadcastable":false,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [34437047]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "control"; window.loswp.useOptimizedScribd4genScript = false; window.loswp.appleClientId = 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href="https://independent.academia.edu/TanyaDetto">Tanya Detto</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Ethology, 2010</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":"Hunting and predation in a fiddler crab","attachmentId":74464169,"attachmentType":"pdf","work_url":"https://www.academia.edu/61433421/Hunting_and_predation_in_a_fiddler_crab","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/61433421/Hunting_and_predation_in_a_fiddler_crab"><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="69093332" 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/69093332/Prey_selection_of_the_swimming_crab_Portunus_trituberculatus_Miers_1876_Brachyura_Portunidae_foraging_on_bivalves">Prey selection of the swimming crab Portunus trituberculatus (Miers, 1876) (Brachyura: Portunidae) foraging on bivalves</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="51812042" href="https://su-se.academia.edu/HDircksen">Heinrich Dircksen</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Crustacean Biology</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":"Prey selection of the swimming crab Portunus trituberculatus (Miers, 1876) (Brachyura: Portunidae) foraging on bivalves","attachmentId":79323832,"attachmentType":"pdf","work_url":"https://www.academia.edu/69093332/Prey_selection_of_the_swimming_crab_Portunus_trituberculatus_Miers_1876_Brachyura_Portunidae_foraging_on_bivalves","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/69093332/Prey_selection_of_the_swimming_crab_Portunus_trituberculatus_Miers_1876_Brachyura_Portunidae_foraging_on_bivalves"><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="1616138" 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/1616138/Claw_morphology_prey_size_selection_and_foraging_efficiency_in_generalist_and_specialist_shell_breaking_crabs">Claw morphology, prey size selection and foraging efficiency in generalist and specialist shell-breaking crabs</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="1875878" href="https://uoguelph.academia.edu/ElizabethBoulding">Elizabeth G Boulding</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Experimental Marine Biology and Ecology, 1998</p><p class="ds-related-work--abstract ds2-5-body-sm">Claw morphology, and claw-closing forces of four species of intertidal crabs from San Juan Island, Washington were compared and related these findings were related to prey size selection, shell breaking times and total handling times on their snail prey, Littorina sitkana Philippi. Two functional groups of crabs emerged: generalists and specialists on hard-shelled prey. The generalist, Hemigrapsus nudus (Dana), has an omnivorous diet and possesses weak claws with small, fine denticles and mechanical advantage (MA) of the claw's lever system <0.3, while the specialists, Lophopanopeus bellus (Stimpson), Cancer oregonensis (Dana) and C. productus (Randall), consume hard-shelled prey and possess large, powerful claws with broad, blunt molars and MA>0.3. The claws of the generalist, H. nudus, exhibited weaker claw closing forces (5 N) than those of similar sized specialists (>12 N). When crabs of similar weight were offered four size categories of Littorina sitkana, the generalist, Hemigrapsus nudus, exhibited a consistent preference for the smallest size categories, while the three specialists attacked all size classes offered. Hemigrapsus nudus took significantly longer (134 s) than the specialists (30–52 s) to break open a 4 mm L. sitkana. This difference in shell-breaking time between the generalist and the specialists increased with increasing prey size. The rate of successful attacks on increasingly larger L. sitkana decreased with prey size in the generalist (70% on 4 mm, 37% on 6 mm, and 0% on 8 mm snails), but remained high in the specialists (70–100%). Strength limitation of the claws is the best hypothesis to explain the avoidance of large snails by the generalist, H. nudus.</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":"Claw morphology, prey size selection and foraging efficiency in generalist and specialist shell-breaking crabs","attachmentId":15927546,"attachmentType":"pdf","work_url":"https://www.academia.edu/1616138/Claw_morphology_prey_size_selection_and_foraging_efficiency_in_generalist_and_specialist_shell_breaking_crabs","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/1616138/Claw_morphology_prey_size_selection_and_foraging_efficiency_in_generalist_and_specialist_shell_breaking_crabs"><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="27546169" 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/27546169/Diet_choice_in_an_omnivorous_salt_marsh_crab_different_food_types_body_size_and_habitat_complexity">Diet choice in an omnivorous salt-marsh crab: different food types, body size, and habitat complexity</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="51667868" href="https://independent.academia.edu/GBreed">Greg Breed</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Experimental Marine Biology and Ecology, 2003</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":"Diet choice in an omnivorous salt-marsh crab: different food types, body size, and habitat complexity","attachmentId":47799242,"attachmentType":"pdf","work_url":"https://www.academia.edu/27546169/Diet_choice_in_an_omnivorous_salt_marsh_crab_different_food_types_body_size_and_habitat_complexity","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/27546169/Diet_choice_in_an_omnivorous_salt_marsh_crab_different_food_types_body_size_and_habitat_complexity"><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="2754003" 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/2754003/Effects_of_experience_on_crab_foraging_in_a_mobile_and_a_sedentary_species">Effects of experience on crab foraging in a mobile and a sedentary species</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="117106" href="https://stanford.academia.edu/FiorenzaMicheli">Fiorenza Micheli</a></div><p class="ds-related-work--metadata ds2-5-body-xs">1997</p><p class="ds-related-work--abstract ds2-5-body-sm">The effects of experience on prey and prey-patch choice were compared between two species of marine predatory crabs. 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Milne-Edwards, is smaller and less mobile and is found mostly in oyster reefs and on shelly bottoms.</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":"Effects of experience on crab foraging in a mobile and a sedentary species","attachmentId":30725528,"attachmentType":"pdf","work_url":"https://www.academia.edu/2754003/Effects_of_experience_on_crab_foraging_in_a_mobile_and_a_sedentary_species","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/2754003/Effects_of_experience_on_crab_foraging_in_a_mobile_and_a_sedentary_species"><span class="ds2-5-text-link__content">View PDF</span><span 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