2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 2:00 PM - 3:30 PM | SEASONAL MIGRATION OF WATER BOATMEN (HEMIPTERA: CORIXIDAE) AS A WETLAND-RIVER LINKAGE AND DIETARY SUBSIDY TO RIVERINE FISH | Virtual Platform
SEASONAL MIGRATION OF WATER BOATMEN (HEMIPTERA: CORIXIDAE) AS A WETLAND-RIVER LINKAGE AND DIETARY SUBSIDY TO RIVERINE FISH
Migratory organisms can link aquatic ecosystems by subsidizing recipient food webs. We investigated a food web subsidy in the form of corixids that fly from wetlands into large rivers in the prairies of North America every fall. Within the North and South Saskatchewan Rivers in the province of Saskatchewan, this migration led to drastically increased corixid densities as high as >3,000 individuals/m2 in areas of standing or slow-moving water, and shifted the species composition to one of a wetland assemblage. During fall migrations, we estimate that ~40,000 corixids entered every square meter of water along the banks of these rivers, which may have represented the movement of ~2,000 metric tons of biomass. Fish species such as goldeye (Hiodon alosoides), mooneye (Hiodon tergisus), longnose sucker (Catostomus catostomus) and white sucker (Catostomus commersoni) foraged heavily on this resource, with corixids occurring in 97% to 100% of individuals and accounting for 38% to 97% of stomach contents during the corixid migration period in fall. This transfer of insect material between wetlands and rivers links the food webs of these two ecosystems, highlighting a need for conservation to ensure that this connection is maintained.
- Food webs
- Energy flows
- Movement
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Presenters/Authors
Stephen Srayko
(), University of Saskatchewan, shs176@mail.usask.ca;
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Tim Jardine
(), University of Saskatchewan, tim.jardine@usask.ca;
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Iain Phillips
(), Troutreach Saskatchewan/ Water Security Agency of Saskatchewan, iain.phillips@wsask.ca;
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Doug Chivers
(), University of Saskatchewan, doug.chivers@usask.ca;
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