2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 12:00 PM - 12:15 PM | SEASONAL MIGRATION OF CORIXIDS (HEMIPTERA: CORIXIDAE) AS A LINKAGE BETWEEN WETLAND AND RIVER ECOSYSTEMS | 420 A
SEASONAL MIGRATION OF CORIXIDS (HEMIPTERA: CORIXIDAE) AS A LINKAGE BETWEEN WETLAND AND RIVER ECOSYSTEMS
Linkages between spatially separated water bodies in the form of migratory insects have the potential to greatly influence ecosystem functioning and food web dynamics. Migratory insects that act as food web subsidies can also be instrumental to fish production in lotic ecosystems. We have identified a potentially important subsidy in the form of migrating corixids (Hemiptera: Corixidae) that move from wetlands into the North and South Saskatchewan Rivers during the fall. Results from 2015 and 2016 indicate that corixid migration begins in late September, marked by tremendous increases in abundance in the rivers and decreased abundances of migratory corixid species in wetlands. A shift in species composition also occurs as wetland migrants arrive in the rivers. The stable isotope of sulphur was used to trace this migration between the two habitats. Gut content analyses show that goldeye (Hiodon alosoides), mooneye (Hiodon tergisus), longnose sucker (Catostomus catostomus) and white sucker (Catostomus commersoni), make heavy use this forage subsidy. This study could underscore a need for the integrated conservation of both wetland and river habitats by characterizing a linkage that exists between these spatially separated ecosystems.
- Invertebrate
- Pulse
- Wetland
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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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