NDLI: Contrasting the effects of climatic, nutrient, and oxygen dynamics on subfossil chironomid assemblages: a paleolimnological experiment from eutrophic High Arctic ponds

Content Provider	Springer Nature Link
Author	Stewart, Emily M. Michelutti, Neal Blais, Jules M. Mallory, Mark L. Douglas, Marianne S. V. Smol, John P.
Copyright Year	2012
Abstract	Nutrients from the waste products of large seabird colonies can enter freshwater ecosystems, markedly altering water quality and biotic assemblages, especially in nutrient-poor regions like the Canadian High Arctic. Here, we investigate the influence of nutrient-rich seabird wastes on freshwater larval chironomid assemblages from two distinct seabird colonies. The study sites include four ponds dominated by northern fulmars (Fulmarus glacialis) at Cape Vera, Devon Island, as well as one pond near a large group of common eider ducks (Somateria mollissima borealis) on Tern Island (unofficial name) near Cornwallis Island, Nunavut. The rare combination of nutrient-enriched and well-oxygenated waters allowed us to contrast the effects of nutrients, oxygen, and temperature on chironomid community structure in shallow Arctic ponds using sediment cores. Despite highly elevated nutrient levels, the subfossil assemblages were dominated by cold stenotherms typical of oligotrophic waters. Although nutrient inputs appear to have increased chironomid head capsule numbers due to enhanced food availability, the fertilization had little direct effect on assemblage composition, at least at the taxonomic level achievable based on fossil material. The presence of low abundances of eutrophic/anoxic taxa, such as Chironomus plumosus-type, suggests that biogeographic barriers to dispersal are not influencing the assemblages. These data demonstrate that, in the presence of high concentrations of dissolved oxygen, nutrient enrichment had little direct effect on chironomid community composition in shallow Arctic ponds.
Starting Page	205
Ending Page	219
Page Count	15
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	49
Issue Number	2
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-11-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Paleolimnology Canadian High Arctic Chironomids Seabirds Marine-derived nutrients Stable nitrogen isotopes Paleontology Sedimentology Climate Change Physical Geography Freshwater & Marine Ecology Geology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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