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Full-Text Articles in Biology
Zooplankton Sensitivity To Climate-Driven Conditions In High-Elevation Lakes In Maine, Sadie Gray, Rachel Hovel
Zooplankton Sensitivity To Climate-Driven Conditions In High-Elevation Lakes In Maine, Sadie Gray, Rachel Hovel
Student Scholarship
Lakes respond to climatic change with shifts in seasonality, stratification, primary production, biological community composition, and other conditions. Compared to larger lower-elevation lakes, “mountain” lakes are hypothesized to be more sensitive to some aspects of climatic change (e.g. watershed inputs from precipitation), but more buffered from others (e.g. snowpack stabilizing ice phenology). In this study of nine high-elevation lakes in the western Maine mountains, we evaluated the relationship between climate-linked lake conditions and zooplankton abundance and community composition. Water temperature, dissolved oxygen, chlorophyll concentration, ice breakup date, secchi disk depth, and zooplankton abundance and taxonomic identification were collected from these …
An Elevational Gradient In Thermal Tolerance Among Daphnia From Western Maine Lakes, Wheeler Lowell
An Elevational Gradient In Thermal Tolerance Among Daphnia From Western Maine Lakes, Wheeler Lowell
HON 499 Honors Thesis or Creative Project
With climate change threatening biodiversity worldwide, it is important to understand species’ physiological responses to changing thermal environments. This study examined whether thermal tolerance (measured as time to immobilization, Timm) in the zooplankton Daphnia catawba and D. schødleri varied along an elevational gradient in Western Maine. Specimens collected from five lakes were subjected to heat stress trials to look for inter-population variation. Thermal tolerance was strongly correlated with several elevation-driven lake temperature variables, with the percent of variation explained ranging from 13-37%. Daphnia from cooler, high-elevation lakes were more sensitive to elevated temperatures. While latitudinal gradients have been examined extensively, …
The Effect Of Changing Substrate On Arctic Aquatic Invertebrates Abundance, Tom Dolman
The Effect Of Changing Substrate On Arctic Aquatic Invertebrates Abundance, Tom Dolman
Michael D. Wilson Symposium
Climate change is directly affecting tundra ecosystems in northern regions, and warming temperatures have caused discontinuous permafrost and thawing sediments across the region. This project investigates how increasing erosion and the foraging patterns of migratory snow geese may degrade habitat for aquatic invertebrates in the upper Mast River, located in Wapusk National Park, Manitoba, Canada. In the past two decades, many of the important species of aquatic invertebrates have shown declines. Declining invertebrate populations are predicted to affect aquatic ecosystems and decrease the resources available to shorebirds and waterfowl, which breed and migrate through this area.