Effects of experimental warming and simulated goose enrichment on wetland communities at the Arctic?s edge

Authors: J M Davenport; L Fishback; Blake R Hossack
Contribution Number: 700



Global warming-related changes to freshwater
ecosystems in Arctic and Subarctic regions have
been magnified by nutrient input from increasing
waterfowl populations. To gain insight into how these
changes might affect ecosystem function, we conducted
a mesocosm experiment in the Subarctic by
enriching N and P (1 9, 10 9, and 20 9 treatments)
and increasing mean water temperatures B 3C. We
measured responses of two species of larval amphibians,
periphyton, and phytoplankton. Wood frog
(Rana sylvatica) larvae developed quicker (odds ratio
[OR] for 1C increase = 0.903, 95% CI 0.892–0.912)
and were more likely to metamorphose (OR 1.076,
95% CI 0.022–14.73) in warmer waters. Boreal chorus
frogs (Pseudacris maculata) also developed quicker
with warmer temperatures (OR 0.880, 95% CI
0.860–0.900), despite a non-significant trend toward
reduced survival (OR 0.853, 95% CI 0.696–1.039).
Periphyton and phytoplankton concentrations
increased with nutrient additions, as did size of wood
frog metamorphs. Periphyton and phytoplankton did
not vary with temperature, but periphyton was limited
by tadpole abundance. Our results highlight the
potential for non-linear responses to ecosystem
change, with species-specific consumer and ecosystem
responses that depend on the magnitude of

Publication details
Published Date: 2020
Outlet/Publisher: Hydrobiologia (2020) 847:3677–3690
Media Format: .PDF

ARMI Organizational Units:
Rocky Mountains, Northern - Biology
Climate Change; Monitoring and Population Ecology; Species and their Ecology; Water
Place Names:
amphibians; climate; competition; ecology; hydroperiod; monitoring; pond-breeding amphibians; population; stressors; water quality; wetlands
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