Hampton, Stephanie E. and Galloway, Aaron W.E. and Powers, Stephen M. and Ozersky, Ted and Woo, Kara H. and Batt, Ryan D. and Labou, Stephanie G. and O'Reilly, Catherine M. and Sharma, Sapna and Lottig, Noah R. and Stanley, Emily H. and North, Rebecca L. and Stockwell, Jason D. and Adrian, Rita and Weyhenmeyer, Gesa A. and Roberts, Sarah and Swann, George E.A.
Ecology under lake ice.
Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known of winter ecology in these systems, due to a historical research focus on summer "growing seasons." We executed the first global quantitative synthesis on under-ice lake ecology, including 36 abiotic and biotic variables from 42 research groups and 101 lakes, examining seasonal differences and connections as well as how seasonal differences vary with geophysical factors. Plankton were more abundant under ice than expected; mean winter values were 42.8% of summer values for chlorophyll a, 15.8% of summer phytoplankton biovolume, and 34.4% of summer zooplankton density. Dissolved nitrogen concentrations were typically higher during winter, and these differences were exaggerated in smaller lakes. Lake size also influenced winter-summer patterns for dissolved organic carbon (DOC), with higher winter DOC in smaller lakes. At coarse levels of taxonomic aggregation, phytoplankton and zooplankton community composition showed few systematic differences between seasons, although literature suggests that seasonal differences are frequently lake-specific, species-specific, or occur at the level of functional group. Within the subset of lakes that had longer time-series, winter influenced the subsequent summer for some nutrient variables and zooplankton biomass.
||lake, aquatic ecosystem, freshwater, winter ecology, seasonal, data synthesis, 97 plankton, limnology, long-term, time series
||University of Nottingham UK Campus > Faculty of Social Sciences > School of Geography
||14 Oct 2016 09:03
||14 Oct 2016 11:11
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