A paleolimnological study of algae in the sediments of shallow ponds on Cape Herschel (which faces Smith Sound on Ellesmere's eastern coast) found that the ponds had been permanent and relatively stable for several millennia until experiencing ecological changes associated with warming, beginning around 1850 and accelerating in the early 2000s. During the 23-year study period, an ecological threshold was crossed as several of the study ponds had completely desiccated while others had very reduced water levels. In addition, the wetlands surrounding the ponds were severely affected and dried vegetation could be easily burned.
a pALeoLImnOlOgical study OF ALGaE iN THe seDImeNTS oF Shallow POndS on CAPe hersChel (wHiCh faces smITh sound oN ELLesmeRe's eAstern coast) fOuNd thAT ThE ponds had Been peRmanENt aNd RelAtivEly sTaBlE for several mIllenNIa unTIL ExpeRienciNg ecoLogicAl cHanGes AsSociaTED witH wARming, bEgInninG aRound 1850 aNd acCElERAting in tHE EaRly 2000s. dUrINg the 23-yEAr sTuDy peRioD, an ecologIcal threshoLd WAS cRossEd as SevEral of thE stUDY ponDs had ComPLetElY dESiccatED WhiLE others hAd verY reDUCed wATer leVEls. iN aDDitIon, the wetLands sUrrOuNding the Ponds were sEVErEly affected And drieD veGetaTiOn coUld bE EAsily BurneD