To Shrink Or Not To Shrink: Impact of Global Warming on a Size-Structured Population

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Wang, Xueqi Sharon
Betini, Gustavo
Fryxell, John
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Global warming significantly impacts the persistence of species, food web dynamics, habitat characteristics and ecosystem services. As ambient temperature increases, one of the most observed consequences are changes in individual sizes. These shifts in body size impact both individual species capacity as well as the broader environment. In a structured aquatic community, species often have a size-specific ingestion capacity, and their survival and their number of offspring are highly size-dependent. To understand the mechanisms behind the shifts in body size and to project future population trends, researchers experiment with water flea Daphnia magna in the Limnotron Facility, the world's largest freshwater mesocosm. The purpose of the project is to understand how increases in water temperature affect the population size structure of daphnia. A projection model will be constructed to predict daphnia population trends and to examine how these changes impact population dynamics. Specifically, researchers are working with six tanks with the capacity to each hold 26,000L of water. Three tanks are set at 15oC while the other three are at 25oC. For each temperature treatment, one tank with be filled only with Chlorella vulgaris, a species acting as the water flea primary food source, and 2 tanks with receive both the water flea Daphnia magna and the Chlorelia vulgaris.

Poster was part of 'What We Know' display, held on March 1, 2017 at the Quebec Street Mall in Downtown Guelph. At 'What We Know,' the Community Engaged Scholarship Institute brought together 50 posters featuring diverse research on Guelph and Wellington from community organizations, municipal staff, faculty and students. Topics included feral cats, farmland loss, food waste, the wellbeing of children and more - all specific to Guelph and Wellington.
What we know, Guelph, global warming, daphnia magna, limnotron, freshwater mesocosm, chlorelia vulgaris