Beaver ponds may exacerbate warming in Arctic, scientists say | Animals

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data-link-name="header : secondary : View all Opinion" data-testid="column-collapse-sublink-Opinion" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">View all Opinion</a></li><li role="none" class="dcr-4hq641"><a href="/profile/editorial" role="menuitem" data-link-name="header : secondary : The Guardian view" data-testid="column-collapse-sublink-The Guardian view" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">The Guardian view</a></li><li role="none" class="dcr-4hq641"><a href="/index/contributors" role="menuitem" data-link-name="header : secondary : Columnists" data-testid="column-collapse-sublink-Columnists" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Columnists</a></li><li role="none" class="dcr-4hq641"><a href="/tone/cartoons" role="menuitem" data-link-name="header : secondary : Cartoons" data-testid="column-collapse-sublink-Cartoons" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Cartoons</a></li><li role="none" class="dcr-4hq641"><a 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}) })</script><input type="checkbox" id="Sport-checkbox-input" tabIndex="-1" aria-hidden="true" class="dcr-1acea34"/><label id="Sport-button" aria-label="Toggle Sport" for="Sport-checkbox-input" aria-haspopup="true" aria-controls="sportLinks" tabIndex="-1" role="menuitem" data-testid="column-collapse-Sport" data-link-name="header : secondary : Sport" class="selectableMenuItem dcr-10b2o1s">Sport</label><ul role="menu" id="sportLinks" data-testid="sportLinks" class="dcr-wp8bgr"><li role="none" class="dcr-9ra8aa"><a href="/sport" role="menuitem" data-link-name="header : secondary : View all Sport" data-testid="column-collapse-sublink-Sport" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">View all Sport</a></li><li role="none" class="dcr-4hq641"><a href="/football" role="menuitem" data-link-name="header : secondary : Football" data-testid="column-collapse-sublink-Football" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Football</a></li><li role="none" class="dcr-4hq641"><a href="/sport/cricket" role="menuitem" data-link-name="header : secondary : Cricket" data-testid="column-collapse-sublink-Cricket" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Cricket</a></li><li role="none" class="dcr-4hq641"><a href="/sport/rugby-union" role="menuitem" data-link-name="header : secondary : Rugby union" data-testid="column-collapse-sublink-Rugby union" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Rugby union</a></li><li role="none" class="dcr-4hq641"><a href="/sport/tennis" role="menuitem" data-link-name="header : secondary : Tennis" data-testid="column-collapse-sublink-Tennis" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Tennis</a></li><li role="none" class="dcr-4hq641"><a href="/sport/cycling" role="menuitem" data-link-name="header : secondary : Cycling" data-testid="column-collapse-sublink-Cycling" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Cycling</a></li><li role="none" class="dcr-4hq641"><a href="/sport/formulaone" role="menuitem" 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class="dcr-142siv7"><div id="img-1" class="dcr-1t8m8f2"><picture class="dcr-evn1e9"><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=620&dpr=2&s=none&crop=none" media="(min-width: 980px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 980px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=620&dpr=1&s=none&crop=none" media="(min-width: 980px)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=700&dpr=2&s=none&crop=none" media="(min-width: 740px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 740px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=700&dpr=1&s=none&crop=none" media="(min-width: 740px)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=620&dpr=2&s=none&crop=none" media="(min-width: 660px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 660px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=620&dpr=1&s=none&crop=none" media="(min-width: 660px)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=645&dpr=2&s=none&crop=none" media="(min-width: 480px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 480px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=645&dpr=1&s=none&crop=none" media="(min-width: 480px)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=465&dpr=2&s=none&crop=none" media="(min-width: 320px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 320px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=465&dpr=1&s=none&crop=none" media="(min-width: 320px)"/><img alt="A pair of beavers in the water" src="https://i.guim.co.uk/img/media/78477555322642d4f4c16c601ac20acdef8bad9f/113_224_1974_1184/master/1974.jpg?width=465&dpr=1&s=none&crop=none" width="465" height="278.90577507598783" loading="eager" class="dcr-evn1e9"/></picture><span class="dcr-v822l1"><div class="dcr-gup2gr"><div class="dcr-zy1nbx"><label for="the-checkbox" class="dcr-1xgwz8b"><svg width="6" height="14" fill="white" viewBox="0 0 6 14"><path d="M4.6 12l-.4 1.4c-.7.2-1.9.6-3 .6-.7 0-1.2-.2-1.2-.9 0-.2 0-.3.1-.5l2-6.7H.7l.4-1.5 4.2-.6h.2L3 12h1.6zm-.3-9.2c-.9 0-1.4-.5-1.4-1.3C2.9.5 3.7 0 4.6 0 5.4 0 6 .5 6 1.3c0 1-.8 1.5-1.7 1.5z"></path></svg></label><input type="checkbox" id="the-checkbox"/> <div id="the-caption"><figcaption data-spacefinder-role="inline" class="dcr-1ie0kc7"><span class="dcr-1inf02i"><svg width="18" height="13" viewBox="0 0 18 13"><path d="M18 3.5v8l-1.5 1.5h-15l-1.5-1.5v-8l1.5-1.5h3.5l2-2h4l2 2h3.5l1.5 1.5zm-9 7.5c1.9 0 3.5-1.6 3.5-3.5s-1.6-3.5-3.5-3.5-3.5 1.6-3.5 3.5 1.6 3.5 3.5 3.5z"></path></svg></span><span class="dcr-1qvd3m6">Beavers in the area studied by the University of Alaska in the north-west of the state.</span> Photograph: Ken Tape/University of Alaska, Fairbanks</figcaption></div></div></div></span><a href="#img-1" data-ignore="global-link-styling" aria-hidden="true" tabIndex="-1" class="open-lightbox dcr-13fd1ms"><button data-element-id="fb477465-11f5-426a-a260-c17caf475924" type="button" aria-haspopup="dialog" class="open-lightbox dcr-4tmywn"><svg viewBox="-3 -3 30 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path fill-rule="evenodd" clip-rule="evenodd" d="M23 8.75V1.5l-.5-.5h-7.25v1.25l4.5.6L14 8.575 15.4 10l5.75-5.725.6 4.475zm-22 6.5v7.25l.475.5h7.25v-1.25l-4.475-.6 5.725-5.775L8.6 14l-5.775 5.725-.575-4.475z"></path></svg><span class="dcr-194i6pr">View image in fullscreen</span></button></a></div><span class="dcr-n4pnam"><figcaption data-spacefinder-role="inline" class="dcr-1fujct4"><span class="dcr-1inf02i"><svg width="18" height="13" viewBox="0 0 18 13"><path d="M18 3.5v8l-1.5 1.5h-15l-1.5-1.5v-8l1.5-1.5h3.5l2-2h4l2 2h3.5l1.5 1.5zm-9 7.5c1.9 0 3.5-1.6 3.5-3.5s-1.6-3.5-3.5-3.5-3.5 1.6-3.5 3.5 1.6 3.5 3.5 3.5z"></path></svg></span><span class="dcr-1qvd3m6">Beavers in the area studied by the University of Alaska in the north-west of the state.</span> Photograph: Ken Tape/University of Alaska, Fairbanks</figcaption></span></figure></div></div></div><aside style="--grid-area:title;" data-gu-name="title" class="dcr-1fnjjtg"><div class="dcr-10355cg"><div class="dcr-0"><span class="dcr-1v9xu6e"></span><a href="https://www.theguardian.com/world/animals" data-component="section" data-link-name="article section" class="content__label__link dcr-qmfkju"><span>Animals</span></a></div></div></aside><div style="--grid-area:border;" data-gu-name="border" class="dcr-1fnjjtg"><div class="dcr-upmzd8"></div></div><div style="--grid-area:headline;" data-gu-name="headline" class="dcr-1fnjjtg"><div class="dcr-14emo0l"><div class="dcr-cohhs3"><div class="dcr-notra3"><div aria-hidden="true" class="dcr-13832xi"><svg width="11" height="11" viewBox="0 0 11 11" fill="currentColor"><path d="M5.4 0C2.4 0 0 2.4 0 5.4s2.4 5.4 5.4 5.4 5.4-2.4 5.4-5.4S8.4 0 5.4 0zm3 6.8H4.7V1.7h.7L6 5.4l2.4.6v.8z"></path></svg> This article is more than <strong>11 months old</strong></div></div><h1 class="dcr-u0152o">Beaver ponds may exacerbate warming in Arctic, scientists say</h1><div class="dcr-1nvgr5i">This article is more than 11 months old</div></div></div></div><div style="--grid-area:standfirst;" data-gu-name="standfirst" class="dcr-1fnjjtg"><div class=" dcr-4gwv1z"><p>Rising temperatures have spurred an influx of beavers to Alaska and northern Canada ‘on a huge scale’</p></div></div><aside style="--grid-area:meta;" data-gu-name="meta" class="dcr-1fnjjtg"><div class="dcr-14emo0l"><div class="dcr-ich95x"><svg xmlns="http://www.w3.org/2000/svg" width="100%" height="13" viewBox="0 0 1300 13" preserveAspectRatio="none" stroke="var(--article-border)" stroke-width="1" aria-hidden="true" focusable="false" class="dcr-194w08h"><line x1="0" x2="1300" y1="0.5" y2="0.5"></line><line x1="0" x2="1300" y1="4.5" y2="4.5"></line><line x1="0" x2="1300" y1="8.5" y2="8.5"></line><line x1="0" x2="1300" y1="12.5" y2="12.5"></line></svg></div></div><div class="dcr-14emo0l"><div class=" dcr-1v9sla6"><div class="dcr-5oiine"><div class="dcr-1kpcv08"><div><address aria-label="Contributor info" data-component="meta-byline" data-link-name="byline"><div class=" dcr-1cfpnlw"><a rel="author" data-link-name="auto tag link" href="https://www.theguardian.com/profile/iansample">Ian Sample</a><span> Science editor</span></div></address><details style="--mobile-color:inherit;" class="dcr-1pexjb9"><summary class="dcr-1ybxn6r"><span class="dcr-u0h1qy">Tue 2 Jan 2024 16.00 GMT</span></summary>Last modified on Wed 3 Jan 2024 13.43 GMT</details></div></div><div data-print-layout="hide" class="dcr-9dgpdq"><div class=" dcr-16lnb0w"><gu-island name="ShareButton" priority="feature" deferUntil="visible" props="{"pageId":"world/2024/jan/02/global-heating-beavers-alaska-northern-canada","webTitle":"Beaver ponds may exacerbate warming in Arctic, scientists say","format":{"design":0,"display":0,"theme":0},"context":"ArticleMeta"}"><a href="mailto:?subject=Beaver ponds may exacerbate warming in Arctic, scientists say&body=https://www.theguardian.com/world/2024/jan/02/global-heating-beavers-alaska-northern-canada?CMP=share_btn_url" type="button" class="dcr-bao4ku">Share<div class="src-button-space"></div><svg viewBox="-3 -3 30 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path fill-rule="evenodd" clip-rule="evenodd" d="M19 16c1.675 0 3 1.35 3 3 0 1.675-1.325 3-3 3a2.97 2.97 0 0 1-2.975-3c0-.125 0-.275.025-.375L7.1 14.15a2.9 2.9 0 0 1-2.075.825C3.325 14.975 2 13.65 2 12a3.004 3.004 0 0 1 3.025-3.025c.775 0 1.5.35 2.075.875l8.95-4.475c-.025-.1-.025-.225-.025-.4A2.966 2.966 0 0 1 19 2c1.675 0 3 1.325 3 2.975C22 6.65 20.675 8 19 8c-.8 0-1.475-.325-2.05-.825l-8.975 4.45C8 11.7 8 11.825 8 12s0 .3-.025.375l8.975 4.45c.575-.5 1.25-.825 2.05-.825m0-12.8c-.975 0-1.8.775-1.8 1.775S18.025 6.8 19 6.8c1 0 1.825-.825 1.825-1.825S20 3.2 19 3.2m0 17.6c1 0 1.825-.825 1.825-1.8 0-1-.825-1.8-1.825-1.8-.975 0-1.8.8-1.8 1.8 0 .975.825 1.8 1.8 1.8"></path></svg></a></gu-island></div><div class=" dcr-1csot3r"><div class="dcr-14baf59"><div></div></div></div></div></div></div></div><div class="dcr-fu29fd"><span class="dcr-1lhv23l"><gu-island name="ExpandableMarketingCardWrapper" priority="enhancement" deferUntil="visible" props="{"guardianBaseURL":"https://www.theguardian.com"}"></gu-island></span></div></aside><div style="--grid-area:body;" data-gu-name="body" class="dcr-1upb05m"><span class="dcr-1iz7gbk"><gu-island name="ExpandableMarketingCardWrapper" priority="enhancement" deferUntil="idle" props="{"guardianBaseURL":"https://www.theguardian.com"}"></gu-island></span><div class="dcr-1a4fred"><div id="maincontent" class="dcr-1bwys2b"><div class="article-body-commercial-selector article-body-viewer-selector dcr-1q6n3e0"><p class="dcr-s3ycb2">The stream through western <a href="https://www.theguardian.com/us-news/alaska" data-link-name="in body link" data-component="auto-linked-tag">Alaska</a> never looked like this before. In aerial photography from the 1980s, it wove cleanly through the tundra, thin as thread. Today, in satellite images, it appears as a string of black patches: one large pond after another, dozens of metres apart.</p><p class="dcr-s3ycb2">It’s a transformation that is happening across the <a href="https://www.theguardian.com/world/arctic" data-link-name="in body link" data-component="auto-linked-tag">Arctic</a>, the result of landscape engineering on an impressive scale. But this is no human endeavour to reshape the world. It is the work of the North American beaver, and there is no sign of it stopping.</p><div id="sign-in-gate"><gu-island name="SignInGateSelector" priority="feature" deferUntil="visible" props="{"contentType":"Article","sectionId":"world","tags":[{"id":"world/animals","type":"Keyword","title":"Animals"},{"id":"environment/climate-crisis","type":"Keyword","title":"Climate crisis"},{"id":"environment/wildlife","type":"Keyword","title":"Wildlife"},{"id":"world/arctic","type":"Keyword","title":"Arctic"},{"id":"us-news/alaska","type":"Keyword","title":"Alaska"},{"id":"world/canada","type":"Keyword","title":"Canada"},{"id":"us-news/us-news","type":"Keyword","title":"US news"},{"id":"environment/environment","type":"Keyword","title":"Environment"},{"id":"science/science","type":"Keyword","title":"Science"},{"id":"campaign/email/green-light","type":"Campaign","title":"Down to Earth (newsletter sign up)"},{"id":"type/article","type":"Type","title":"Article"},{"id":"tone/news","type":"Tone","title":"News"},{"id":"profile/iansample","type":"Contributor","title":"Ian Sample","twitterHandle":"iansample","bylineImageUrl":"https://i.guim.co.uk/img/uploads/2024/11/15/Ian_Sample.jpg?width=300&quality=85&auto=format&fit=max&s=8e4848b5cd47215a09f2a5d1f2d4dd9d","bylineLargeImageUrl":"https://i.guim.co.uk/img/uploads/2024/11/15/Ian_Sample,_L.png?width=300&quality=85&auto=format&fit=max&s=9455f2ae800441cdaea2f1e216d52ea5"},{"id":"publication/theguardian","type":"Publication","title":"The Guardian"},{"id":"theguardian/mainsection","type":"NewspaperBook","title":"Main section"},{"id":"theguardian/mainsection/uknews","type":"NewspaperBookSection","title":"UK news"},{"id":"tracking/commissioningdesk/uk-home-news","type":"Tracking","title":"UK Home News"}],"isPaidContent":false,"isPreview":false,"host":"https://www.theguardian.com","pageId":"world/2024/jan/02/global-heating-beavers-alaska-northern-canada","idUrl":"https://profile.theguardian.com","switches":{"externalVideoEmbeds":true,"abSignInGateMainVariant":true,"lightbox":true,"abGpidPrebidAdUnits":true,"prebidAppnexusUkRow":true,"prebidMagnite":true,"commercialMetrics":true,"prebidTrustx":true,"scAdFreeBanner":false,"adaptiveSite":true,"prebidPermutiveAudience":true,"compareVariantDecision":false,"enableSentryReporting":true,"lazyLoadContainers":true,"ampArticleSwitch":true,"remarketing":true,"articleEndSlot":true,"keyEventsCarousel":true,"registerWithPhone":false,"darkModeWeb":true,"targeting":true,"remoteHeader":true,"slotBodyEnd":true,"prebidImproveDigitalSkins":false,"ampPrebidOzone":true,"extendedMostPopularFronts":true,"emailInlineInFooter":true,"showNewPrivacyWordingOnEmailSignupEmbeds":true,"prebidAnalytics":true,"extendedMostPopular":true,"ampContentAbTesting":false,"prebidCriteo":true,"okta":true,"imrWorldwide":true,"acast":true,"twitterUwt":true,"prebidAppnexusInvcode":true,"ampPrebidPubmatic":true,"abUsaExpandableMarketingCard":true,"a9HeaderBidding":true,"prebidAppnexus":true,"abOnwardsContentArticle":true,"enableDiscussionSwitch":true,"prebidXaxis":true,"stickyVideos":true,"interactiveFullHeaderSwitch":true,"discussionAllPageSize":true,"prebidUserSync":true,"audioOnwardJourneySwitch":true,"brazeTaylorReport":false,"callouts":true,"sentinelLogger":true,"geoMostPopular":true,"weAreHiring":false,"relatedContent":true,"thirdPartyEmbedTracking":true,"prebidOzone":true,"ampLiveblogSwitch":true,"ampAmazon":true,"prebidAdYouLike":true,"mostViewedFronts":true,"optOutAdvertising":true,"abSignInGateMainControl":true,"googleSearch":true,"disableFrontContainerShowHide":false,"abOptOutFrequencyCap":true,"brazeSwitch":true,"prebidKargo":true,"consentManagement":true,"personaliseSignInGateAfterCheckout":true,"prebidSonobi":true,"idProfileNavigation":true,"confiantAdVerification":true,"discussionAllowAnonymousRecommendsSwitch":false,"absoluteServerTimes":false,"permutive":true,"comscore":true,"ampPrebidCriteo":true,"newsletterOnwards":false,"youtubeIma":true,"webFonts":true,"liveBlogTopSponsorship":true,"prebidImproveDigital":false,"abAdBlockAsk":false,"ophan":true,"crosswordSvgThumbnails":true,"prebidTriplelift":true,"weather":false,"prebidPubmatic":true,"serverShareCounts":false,"autoRefresh":true,"enhanceTweets":true,"prebidIndexExchange":true,"prebidOpenx":true,"prebidHeaderBidding":true,"idCookieRefresh":true,"discussionPageSize":true,"smartAppBanner":false,"historyTags":true,"brazeContentCards":true,"remoteBanner":true,"emailSignupRecaptcha":true,"prebidSmart":true,"shouldLoadGoogletag":true,"inizio":true,"europeBetaFront":true}}"></gu-island></div><p class="dcr-s3ycb2">Were the waddling rodents making minor inroads, researchers may never have noticed. But the animals are pouring in, pushing north into new territories. The total number of animals is far from clear, but the ponds they create are hard to miss: in the Arctic tundra of Alaska alone, the number of beaver ponds on streams have doubled to at least 12,000 in the past 20 years. More lodges are dotted along lakes and river banks.</p><figure id="4f202f8b-fa64-4a4a-b290-07c705e99517" data-spacefinder-role="inline" data-spacefinder-type="model.dotcomrendering.pageElements.ImageBlockElement" class=" dcr-173mewl"><div id="img-2" class="dcr-1t8m8f2"><picture class="dcr-evn1e9"><source srcSet="https://i.guim.co.uk/img/media/1dba37516471f484d82f3a13b58bf0911f78e38d/14_14_2295_1711/master/2295.jpg?width=620&dpr=2&s=none&crop=none" media="(min-width: 660px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 660px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/1dba37516471f484d82f3a13b58bf0911f78e38d/14_14_2295_1711/master/2295.jpg?width=620&dpr=1&s=none&crop=none" media="(min-width: 660px)"/><source srcSet="https://i.guim.co.uk/img/media/1dba37516471f484d82f3a13b58bf0911f78e38d/14_14_2295_1711/master/2295.jpg?width=605&dpr=2&s=none&crop=none" media="(min-width: 480px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 480px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/1dba37516471f484d82f3a13b58bf0911f78e38d/14_14_2295_1711/master/2295.jpg?width=605&dpr=1&s=none&crop=none" media="(min-width: 480px)"/><source srcSet="https://i.guim.co.uk/img/media/1dba37516471f484d82f3a13b58bf0911f78e38d/14_14_2295_1711/master/2295.jpg?width=445&dpr=2&s=none&crop=none" media="(min-width: 320px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 320px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/1dba37516471f484d82f3a13b58bf0911f78e38d/14_14_2295_1711/master/2295.jpg?width=445&dpr=1&s=none&crop=none" media="(min-width: 320px)"/><img alt="Comparison of an aerial image of the Arctic tundra in Alaska from 1980 and satellite image from 2019 " src="https://i.guim.co.uk/img/media/1dba37516471f484d82f3a13b58bf0911f78e38d/14_14_2295_1711/master/2295.jpg?width=445&dpr=1&s=none&crop=none" width="445" height="331.76252723311546" loading="lazy" class="dcr-evn1e9"/></picture><a href="#img-2" data-ignore="global-link-styling" aria-hidden="true" tabIndex="-1" class="open-lightbox dcr-13fd1ms"><button data-element-id="4f202f8b-fa64-4a4a-b290-07c705e99517" type="button" aria-haspopup="dialog" class="open-lightbox dcr-4tmywn"><svg viewBox="-3 -3 30 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path fill-rule="evenodd" clip-rule="evenodd" d="M23 8.75V1.5l-.5-.5h-7.25v1.25l4.5.6L14 8.575 15.4 10l5.75-5.725.6 4.475zm-22 6.5v7.25l.475.5h7.25v-1.25l-4.475-.6 5.725-5.775L8.6 14l-5.775 5.725-.575-4.475z"></path></svg><span class="dcr-194i6pr">View image in fullscreen</span></button></a></div><figcaption data-spacefinder-role="inline" class="dcr-1fujct4"><span class="dcr-1inf02i"><svg width="18" height="13" viewBox="0 0 18 13"><path d="M18 3.5v8l-1.5 1.5h-15l-1.5-1.5v-8l1.5-1.5h3.5l2-2h4l2 2h3.5l1.5 1.5zm-9 7.5c1.9 0 3.5-1.6 3.5-3.5s-1.6-3.5-3.5-3.5-3.5 1.6-3.5 3.5 1.6 3.5 3.5 3.5z"></path></svg></span><span class="dcr-1qvd3m6">Comparison of an aerial image from 1980 and satellite image from 2019.</span> Photograph: Ken Tape/University of Alaska, Fairbanks</figcaption></figure><p class="dcr-s3ycb2">“What’s happening here is happening on a huge scale,” says Ken Tape, an ecologist at the University of Alaska, Fairbanks, who is tracking the influx of beavers into the sparse northern landscape. “Our modelling work, which is in progress right now, shows that this entire area, the north slope of Alaska, will be colonised by beavers by 2100.”</p><p class="dcr-s3ycb2">The preponderance of beavers, which can weigh as much as 45kg, follows a collapse in trapping and the warming of a landscape that once proved too bleak for occupation. Global heating has driven the <a href="https://iopscience.iop.org/article/10.1088/1748-9326/abf28b" data-link-name="in body link">shrubification of the Arctic tundra</a>; the harsh winter is shorter, and there is more free-running water in the coldest months. Instead of felling trees for their dams, the beavers construct them from surrounding shrubs, creating deep ponds in which to build their lodges.</p><gu-island name="InteractiveBlockComponent" priority="critical" deferUntil="idle" props="{"url":"https://interactive.guim.co.uk/uploader/embed/2024/01/alaska-zip/giv-134251yQVR9ocOcKA","scriptUrl":"https://interactive.guim.co.uk/embed/iframe-wrapper/0.1/boot.js","alt":"Beavers in Alaska","format":{"design":0,"display":0,"theme":0},"elementId":"b1df7f10-f1ef-4a53-a377-f2bbe7533bb2","isMainMedia":false}"><figure id="b1df7f10-f1ef-4a53-a377-f2bbe7533bb2" data-alt="Beavers in Alaska" data-testid="interactive-element-Beavers%20in%20Alaska" data-spacefinder-role="inline" class="element element-interactive element--inline element-inline dcr-w422y2"><div data-name="placeholder" class="dcr-ri3hap"><div class="dcr-1h7eqaz"></div></div><a data-name="placeholder" href="https://interactive.guim.co.uk/uploader/embed/2024/01/alaska-zip/giv-134251yQVR9ocOcKA" class="dcr-1eupayo">Beavers in Alaska</a></figure></gu-island><p class="dcr-s3ycb2">The new arrivals cause plenty of disruption. For some communities, the rivers and streams are the roads of the landscape, and the dams make effective roadblocks. As the structures multiply, more land is flooded and there can be less fresh water for drinking downstream. But there are other, less visible effects too. The animals are participants in a feedback loop: climate change opens the landscape to beavers, whose ponds drive further warming, which attracts even more paddle-tailed comrades.</p><p class="dcr-s3ycb2">Physics suggested this would happen. Beaver ponds are new bodies of water that cover bare permafrost. Because the water is warm – relatively speaking – it thaws the hard ground, which duly releases methane, one of the most potent greenhouse gases.</p><figure id="85e857c6-6d1b-40c3-97f3-e2234f1f8607" data-spacefinder-role="richLink" data-spacefinder-type="model.dotcomrendering.pageElements.RichLinkBlockElement" class=" dcr-1your1i"><gu-island name="RichLinkComponent" priority="feature" deferUntil="idle" props="{"richLinkIndex":9,"element":{"_type":"model.dotcomrendering.pageElements.RichLinkBlockElement","prefix":"Related: ","text":"Beavers are back – but scientists fear Defra’s silence on protection deal ","elementId":"85e857c6-6d1b-40c3-97f3-e2234f1f8607","role":"richLink","url":"https://www.theguardian.com/environment/2023/sep/03/beavers-are-back-but-scientists-fear-defras-silence-on-protection-deal"},"ajaxUrl":"https://api.nextgen.guardianapps.co.uk","format":{"design":0,"display":0,"theme":0}}"><div data-print-layout="hide" data-link-name="rich-link-9 | 9" data-component="rich-link" data-name="placeholder" class="dcr-1kyw41h"><div data-format-theme="5" data-format-design="0" data-format-display="0" class="dcr-1qa9hlt"><a href="https://www.theguardian.com/environment/2023/sep/03/beavers-are-back-but-scientists-fear-defras-silence-on-protection-deal" class="dcr-1m887w9"><div class="dcr-1lhuo3r"></div><div class="dcr-ut4tvs"><div class="dcr-1h5b6rb"><div class="dcr-1dgt1gs">Beavers are back – but scientists fear Defra’s silence on protection deal </div></div><div class="dcr-eurq8n"><svg width="24" height="24" viewBox="0 0 24 24"><g fill-rule="evenodd"><path d="m12 0c-6.627 0-12 5.373-12 12 0 6.627 5.373 12 12 12 6.627 0 12-5.373 12-12 0-6.627-5.373-12-12-12m.21 19l-.637-.668 4.888-6.326h-11.465v-1.01h11.465l-4.888-6.333.637-.668 6.79 7.158v.685l-6.79 7.157" class="rich-link__arrow-icon"></path></g></svg><div class="dcr-fkf7vq">Read more</div></div></div></a></div></div></gu-island></figure><p class="dcr-s3ycb2">Scientists now have evidence this is happening. Armed with high-resolution satellite imagery, Tape and his colleagues located beaver ponds in the lower Noatak River basin area of north-western Alaska. They then analysed infrared images captured by Nasa planes flying over the region. Overlaying the two revealed a <a href="https://iopscience.iop.org/article/10.1088/1748-9326/acde8e" data-link-name="in body link">clear link between beaver ponds and methane hotspots</a> that extended for tens of metres around the ponds.</p><p class="dcr-s3ycb2">“The transformation of these streams is a positive feedback that is accelerating the effects of climate change, and that is what’s concerning,” says Tape. “They are accelerating it at every one of these points.”</p><p class="dcr-s3ycb2">Because the Nasa images give only a snapshot in time, the researchers will head out next year to measure methane on the ground. With more measurements, they hope to understand how the emissions vary with the age of beaver ponds: do ponds release a steady flow of methane, or does the release wane after a decade or two?</p><p class="dcr-s3ycb2">Alaska is not the only region scientists are watching. Beavers are on the move in northern <a href="https://www.theguardian.com/world/canada" data-link-name="in body link" data-component="auto-linked-tag">Canada</a> too, where the creation of ponds over permafrost will have a similar effect. “The scale of the issue in terms of space and numbers is huge,” Tape says.</p><figure data-spacefinder-role="inline" data-spacefinder-type="model.dotcomrendering.pageElements.NewsletterSignupBlockElement" class=" dcr-173mewl"><a data-ignore="global-link-styling" href="#EmailSignup-skip-link-14" class="dcr-jzxpee">skip past newsletter promotion</a><aside aria-label="newsletter promotion" class="dcr-av5vqf"><div class="dcr-10et71f"><p class="dcr-rsfwa">Sign up to <span>Down to Earth</span></p><div class="dcr-9ypm66"><div class="dcr-ibdtyj"><div class="dcr-1hwoqtr"><svg viewBox="-3 -3 30 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path fill-rule="evenodd" clip-rule="evenodd" d="M18.364 2H5.636v5.68H3.43L2 9.29l9.048 7.504h1.904L22 9.289 20.571 7.68h-2.207zm-1.819 5.68v-.946h-9.09v.946zm0-3.787h-9.09v.947h9.09zM2 20.58v-8.994l9.048 6.627h1.904L22 11.586v8.994L20.571 22H3.43zM7.455 9.574h9.09v.947h-9.09z"></path></svg></div><span class="dcr-tx2qx">Free weekly newsletter</span></div></div></div><p class="dcr-1xjndtj">The planet's most important stories. Get all the week's environment news - the good, the bad and the essential</p><gu-island name="SecureSignup" priority="feature" deferUntil="visible" props="{"newsletterId":"green-light","successDescription":"The planet's most important stories. Get all the week's environment news - the good, the bad and the essential"}"><form id="secure-signup-green-light" class="dcr-kfi215"><label for="P0-2" class="dcr-0"><div class="dcr-1qn103b">Enter your email address </div></label><input type="email" id="P0-2" aria-required="true" aria-invalid="false" aria-describedby required name="email" class="dcr-dpem99"/><button type="submit" aria-live="polite" class="dcr-zll6x8">Sign up</button></form></gu-island><span class="dcr-1eusqlu"><strong>Privacy Notice: </strong>Newsletters may contain info about charities, online ads, and content funded by outside parties. For more information see our <a data-ignore="global-link-styling" href="https://www.theguardian.com/help/privacy-policy" rel="noreferrer" class="dcr-1rjy2q9">Privacy Policy</a>. We use Google reCaptcha to protect our website and the Google <a data-ignore="global-link-styling" href="https://policies.google.com/privacy" rel="noreferrer" class="dcr-1rjy2q9">Privacy Policy</a> and <a data-ignore="global-link-styling" href="https://policies.google.com/terms" rel="noreferrer" class="dcr-1rjy2q9">Terms of Service</a> apply.</span></aside><p id="EmailSignup-skip-link-14" tabIndex="0" aria-label="after newsletter promotion" role="note" class="dcr-jzxpee">after newsletter promotion</p></figure><figure id="66ae6628-85b4-4a17-be86-f8e02f27fe19" data-spacefinder-role="richLink" data-spacefinder-type="model.dotcomrendering.pageElements.RichLinkBlockElement" class=" dcr-1your1i"><gu-island name="RichLinkComponent" priority="feature" deferUntil="idle" props="{"richLinkIndex":15,"element":{"_type":"model.dotcomrendering.pageElements.RichLinkBlockElement","prefix":"Related: ","text":"‘You can’t control what beavers do or how they do it!’ Could rewilding help England fight droughts?","elementId":"66ae6628-85b4-4a17-be86-f8e02f27fe19","role":"richLink","url":"https://www.theguardian.com/environment/2022/aug/24/you-cant-control-what-beavers-do-or-how-they-do-it-could-rewilding-help-england-fight-droughts"},"ajaxUrl":"https://api.nextgen.guardianapps.co.uk","format":{"design":0,"display":0,"theme":0}}"><div data-print-layout="hide" data-link-name="rich-link-15 | 15" data-component="rich-link" data-name="placeholder" class="dcr-1kyw41h"><div data-format-theme="5" data-format-design="0" data-format-display="0" class="dcr-1qa9hlt"><a href="https://www.theguardian.com/environment/2022/aug/24/you-cant-control-what-beavers-do-or-how-they-do-it-could-rewilding-help-england-fight-droughts" class="dcr-1m887w9"><div class="dcr-1lhuo3r"></div><div class="dcr-ut4tvs"><div class="dcr-1h5b6rb"><div class="dcr-1dgt1gs">‘You can’t control what beavers do or how they do it!’ Could rewilding help England fight droughts?</div></div><div class="dcr-eurq8n"><svg width="24" height="24" viewBox="0 0 24 24"><g fill-rule="evenodd"><path d="m12 0c-6.627 0-12 5.373-12 12 0 6.627 5.373 12 12 12 6.627 0 12-5.373 12-12 0-6.627-5.373-12-12-12m.21 19l-.637-.668 4.888-6.326h-11.465v-1.01h11.465l-4.888-6.333.637-.668 6.79 7.158v.685l-6.79 7.157" class="rich-link__arrow-icon"></path></g></svg><div class="dcr-fkf7vq">Read more</div></div></div></a></div></div></gu-island></figure><p class="dcr-s3ycb2">Helen Wheeler, an associate professor at Anglia Ruskin University, works with communities in the Gwich’in settlement area of northern Canada. There, the beaver population appears to be rising more gradually than in Alaska, but surveys conducted with boats and drones still point to a doubling since the 1960s. “We do see an increase in beavers, but it’s not the exponential rise seen in some areas of Alaska,” Wheeler says. “There’s a lot of variability year on year, which probably reflects what a harsh environment it is.”</p><p class="dcr-s3ycb2">The beavers do not have a wholly negative impact. The mini-oases created by the animals can boost local biodiversity. And for some communities, the animals themselves are a potential source of meat and perhaps even fur.</p><p class="dcr-s3ycb2">Still, many are wary. While not all beavers build dams, those that do can affect water quality and the movement of fish, and make places inaccessible by flooding the land and blocking the routes through it. Even without methane emissions to worry about, researchers and indigenous communities are wondering what, if anything, should be done.</p><p class="dcr-s3ycb2">The question will be up for discussion in February when researchers, indigenous groups, land managers and others in the Arctic Beaver Observation Network hold their annual meeting in Fairbanks, Alaska. The meeting will draw on experts who manage beavers in other regions to explore the possible options.</p><p class="dcr-s3ycb2">“If it’s a problem, what can we do about it? I have no answers,” Tape says. “You can put a bounty out there and start killing them, but the moment you stop, three to five years later you are going to be back in the exact same position. Not to mention the fact that it’s logistically impossible to do that.”</p><p class="dcr-s3ycb2">“People do eat them, but I would say less now than they used to,” Tape adds. “I’ve never had it, but I think that is going to change. I hear it’s good eating.”</p></div></div><gu-island name="SlotBodyEnd" priority="feature" deferUntil="visible" props="{"contentType":"Article","contributionsServiceUrl":"https://contributions.guardianapis.com","idApiUrl":"https://idapi.theguardian.com","isMinuteArticle":false,"isPaidContent":false,"pageId":"world/2024/jan/02/global-heating-beavers-alaska-northern-canada","sectionId":"world","shouldHideReaderRevenue":false,"stage":"PROD","tags":[{"id":"world/animals","type":"Keyword","title":"Animals"},{"id":"environment/climate-crisis","type":"Keyword","title":"Climate crisis"},{"id":"environment/wildlife","type":"Keyword","title":"Wildlife"},{"id":"world/arctic","type":"Keyword","title":"Arctic"},{"id":"us-news/alaska","type":"Keyword","title":"Alaska"},{"id":"world/canada","type":"Keyword","title":"Canada"},{"id":"us-news/us-news","type":"Keyword","title":"US 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src="https://i.guim.co.uk/img/media/73cdef720e47edea19e2f241b60d0449bd5624b8/0_389_6000_3602/master/6000.jpg?width=220&dpr=1&s=none&crop=none" loading="lazy" data-chromatic="ignore" class="dcr-l300o4"/></picture><div class="image-overlay"></div></div><div class="dcr-1oyocfm"><div class="dcr-uh1jz3"><div class="dcr-147a5s0"><h3 class="card-headline dcr-vxekaq"><span class="show-underline dcr-uyefka">Greenland’s leftwing anti-mine party wins snap election</span></h3></div><footer class="dcr-1mv0cw8"><span class="dcr-kap5pr"><gu-island name="RelativeTime" priority="enhancement" deferUntil="visible" props="{"then":1617805349000,"now":1734486840000,"editionId":"INT"}"><time dateTime="2021-04-07T14:22:29.000Z" data-locale="en-gb" title="Wednesday 7 April 2021 at 15:22 British Summer Time">7 Apr 2021</time></gu-island></span></footer></div><div style="margin-top:auto;"></div></div></div><div style="padding:0 8px;"></div></div></div></li><li class="dcr-1hjrzf1"><div data-format-theme="0" data-format-design="0" data-format-display="0" class="dcr-1kaurn1"><div class="dcr-kzb4u"><a href="https://www.theguardian.com/world/2021/apr/06/greenland-goes-to-the-polls-in-rare-earth-mining-election" data-link-name="carousel-small-card-position-7" aria-label="Greenland goes to the polls in rare earth mining election" class="dcr-ezvrjj"></a><div style="background-color:var(--card-background);gap:0;" class="dcr-6su6tq"><div class="dcr-1shzr3u"><picture data-size="carousel" class="dcr-1sv0ry1"><source srcSet="https://i.guim.co.uk/img/media/c78362392a439b4f475f09b12e10d0bef1658229/0_0_4000_2400/master/4000.jpg?width=220&dpr=2&s=none&crop=none" media="(min-width: 320px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 320px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/c78362392a439b4f475f09b12e10d0bef1658229/0_0_4000_2400/master/4000.jpg?width=220&dpr=1&s=none&crop=none" media="(min-width: 320px)"/><img alt src="https://i.guim.co.uk/img/media/c78362392a439b4f475f09b12e10d0bef1658229/0_0_4000_2400/master/4000.jpg?width=220&dpr=1&s=none&crop=none" loading="lazy" data-chromatic="ignore" class="dcr-l300o4"/></picture><div class="image-overlay"></div></div><div class="dcr-1oyocfm"><div class="dcr-uh1jz3"><div class="dcr-147a5s0"><h3 class="card-headline dcr-vxekaq"><span class="show-underline dcr-uyefka">Greenland goes to the polls in rare earth mining election</span></h3></div><footer class="dcr-1mv0cw8"><span class="dcr-kap5pr"><gu-island name="RelativeTime" priority="enhancement" deferUntil="visible" props="{"then":1617719251000,"now":1734486840000,"editionId":"INT"}"><time dateTime="2021-04-06T14:27:31.000Z" data-locale="en-gb" title="Tuesday 6 April 2021 at 15:27 British Summer Time">6 Apr 2021</time></gu-island></span></footer></div><div style="margin-top:auto;"></div></div></div><div style="padding:0 8px;"></div></div></div></li><li class="dcr-1hjrzf1"><div data-format-theme="0" data-format-design="0" data-format-display="0" class="dcr-1kaurn1"><div class="dcr-kzb4u"><a href="https://www.theguardian.com/world/2020/sep/30/greenlands-ice-melting-faster-sea-level-rise" data-link-name="carousel-small-card-position-8" aria-label="Greenland's ice melting faster than at any time in past 12,000 years" class="dcr-ezvrjj"></a><div style="background-color:var(--card-background);gap:0;" class="dcr-6su6tq"><div class="dcr-1shzr3u"><picture data-size="carousel" class="dcr-1sv0ry1"><source srcSet="https://i.guim.co.uk/img/media/f1b5b637ae571bc5c245850c165e1298dcce84f0/0_208_6240_3744/master/6240.jpg?width=220&dpr=2&s=none&crop=none" media="(min-width: 320px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 320px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/f1b5b637ae571bc5c245850c165e1298dcce84f0/0_208_6240_3744/master/6240.jpg?width=220&dpr=1&s=none&crop=none" media="(min-width: 320px)"/><img alt src="https://i.guim.co.uk/img/media/f1b5b637ae571bc5c245850c165e1298dcce84f0/0_208_6240_3744/master/6240.jpg?width=220&dpr=1&s=none&crop=none" loading="lazy" data-chromatic="ignore" class="dcr-l300o4"/></picture><div class="image-overlay"></div></div><div class="dcr-1oyocfm"><div class="dcr-uh1jz3"><div class="dcr-147a5s0"><h3 class="card-headline dcr-vxekaq"><span class="show-underline dcr-uyefka">Greenland's ice melting faster than at any time in past 12,000 years</span></h3></div><footer class="dcr-1mv0cw8"><span class="dcr-kap5pr"><gu-island name="RelativeTime" priority="enhancement" deferUntil="visible" props="{"then":1601478042000,"now":1734486840000,"editionId":"INT"}"><time dateTime="2020-09-30T15:00:42.000Z" data-locale="en-gb" title="Wednesday 30 September 2020 at 16:00 British Summer Time">30 Sept 2020</time></gu-island></span></footer></div><div style="margin-top:auto;"></div></div></div><div style="padding:0 8px;"></div></div></div></li><li class="dcr-1hjrzf1"><div 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