Journal
GLOBAL CHANGE BIOLOGY
Volume 11, Issue 8, Pages 1381-1386Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-2486.2005.00981.x
Keywords
Arctic; Canada; Chironomidae; climate change; food webs; paleoecology; paleolimnology; ponds
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Sedimentary records from three Canadian High Arctic ponds on Ellesmere Island, spanning the last several thousand years, show major shifts in pond communities within the last similar to 200 years. These paleolimnological data indicate that aquatic insect (Diptera: Chironomidae) populations rapidly expanded and greatly increased in community diversity beginning in the 19th century. These invertebrate changes coincided with striking shifts in algal (diatom) populations, indicating strong food-web effects because of climate warming and reduced ice-cover in ponds. Predicted future warming in the Arctic may produce ecological changes that exceed the large shifts that have already occurred since the 19th century.
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