2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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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;


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Sarah Armstrong (), Ohio Northern University, s-armstrong.1@onu.edu;


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Nakiah Dague (), Ohio Northern University, n-dague@onu.edu;


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James Paruk (), St. Joseph's College, jparuk@sjcme.edu;


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Wade Brooks (), Jocassee Outdoor Education, brooks@jocasseewild.org;


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Sherry Abts (), Jocassee Outdoor Education, birdingabts@gmail.com;


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John Mager (), Ohio Northern University, j-mager@onu.edu;


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