2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 2:00 PM - 3:30 PM | DIVE DURATION AND FREQUENCY DIFFER WITH GROUP SIZE AMONG COMMON LOONS (GAVIA IMMER) OVERWINTERING ON A FRESHWATER LAKE IN SOUTH CAROLINA | Virtual Platform

DIVE DURATION AND FREQUENCY DIFFER WITH GROUP SIZE AMONG COMMON LOONS (GAVIA IMMER) OVERWINTERING ON A FRESHWATER LAKE IN SOUTH CAROLINA

More Common Loons (Gavia immer) are likely overwintering on freshwater lakes in southeastern North America. Some individuals exhibit a degree of sociality that is not commonly seen in marine environments. From 1-hour time-activity budgets of focal individuals (N=93), we examined differences in the foraging behavior associated with group size among loons overwintering on Lake Jocassee in 2019 and 2020. Common Loons spent an average of 48.6+3.8% of their time with conspecific groups (mean group size=4, range=1-13 individuals). We found individuals spent more time foraging when alone in comparison to living in a group (ANOVA F7, 318=2.23, P =0.03), but did not observe a change in foraging time with increasing group size. However, we did find individuals had higher dive rates (ANOVA F7,241=4.07, P =0.0003) and shorter dive durations (ANOVA F7,260=16.20, P <0.0001) with increasing group size. These differences may reflect tradeoffs associated with benefits and costs of group foraging for smaller, schooling fishes and larger, solitary fishes.

Ecological dynamics
Ecosystem Dynamics
Ecosystem functioning

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Presenters/Authors

Devon Jackson (), Ohio Northern University, Department of Biological & Allied Health Sciences, d-jackson.5@onu.edu;