2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 10:00 AM - 10:15 AM | ABIOTIC CONDITIONS ALTER DRIFTING MACROINVERTEBRATE COMMUNITIES FOLLOWING LAKE STURGEON SPAWNING EVENTS | 151 G

ABIOTIC CONDITIONS ALTER DRIFTING MACROINVERTEBRATE COMMUNITIES FOLLOWING LAKE STURGEON SPAWNING EVENTS

In long-lived iteroparous fish, such as the threatened lake sturgeon (Acipenser fulvescens), high predation during larval stages represents a major bottleneck to population growth. Many of the same predators that feed on larval lake sturgeon also prey upon drifting macroinvertebrates as major portions of their diet. A multi-year study (2010-2018) was conducted to investigate patterns in aquatic insect drift associated with abiotic conditions in sturgeon spawning habitats of the Black River (Cheboygan, MI, USA). Drifting macroinvertebrates and fish were sampled using D-frame drift nets which were set up nightly during periods following sturgeon spawning. We found several strong predictors of drifting macroinvertebrate abundance and biomass across year, including flow rates, temperature and lunar illumination. While some taxa were observed regardless of abiotic conditions, other taxa displayed preferential drifting activity under certain conditions. Variability in the drift of macroinvertebrate species composition and biomass has implications for predator-prey dynamics across trophic levels within the river system including co-distributed prey such as lake sturgeon.

Food Webs
Invertebrate
Lentic

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Presenters/Authors

Joseph Receveur (), Michigan State University, receveur@msu.edu;