2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 2:45 PM - 3:00 PM | EFFECTS OF HYDROLOGICAL ALTERATIONS TO A MIDWESTERN STREAM ON INSECT EMERGENCE PRODUCTION AND RIPARIAN SPIDER DIETS | 151 ABC
EFFECTS OF HYDROLOGICAL ALTERATIONS TO A MIDWESTERN STREAM ON INSECT EMERGENCE PRODUCTION AND RIPARIAN SPIDER DIETS
Patterns of adult aquatic insect emergence vary seasonally and are influenced by physical factors such as hydrology and substrata. The Cache River, located in southern Illinois, has undergone several hydrologic alterations over the past century. The construction of the Post Creek cutoff effectively divided the system into the upper Cache River (UCR) and lower Cache River (LCR). This resulted in increased water velocities and erosion in the UCR and decreased flow and dissolved oxygen in the LCR. To examine how hydrology influenced stream communities, we measured emerging insect abundance, richness, and diversity in the UCR and LCR during 2017-2018. There was no significant difference in the diversity of emerging insects between the UCR and LCR (p = 0.68). However, richness (p = 0.02) and abundance (p = 0.01) were both significantly higher in the UCR. We hypothesize that differences in emergence production between the two reaches are affecting nutrient subsidy exports to adjacent terrestrial food webs and are currently comparing long-chain polyunsaturated acid (LC-PUFA) levels in riparian spiders from the UCR and LCR. Our research demonstrates that hydrological alterations to streams can have cascading effects on terrestrial systems.
- Subsidy
- Aquatic-terrestrial Linkage
- Invertebrate
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Presenters/Authors
Katie Heiden
(), Southern Illinois University, Katie.heiden@siu.edu;
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