EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/06/2017 | 11:00 AM - 11:15 AM | DIET OF THE CRAYFISH OF THE SUSQUEHANNA RIVER | 305A
DIET OF THE CRAYFISH OF THE SUSQUEHANNA RIVER
Two nonnative crayfish species, rusty crayfish (Orconectes rusticus) and the Allegheny crayfish (O. obscurus), are currently found in the Susquehanna River. In 2015 we hand collected crayfish from among 6 sites spanning almost 115 river miles. Thirty stomachs were dissected from similarly sized individuals at each of the six sites; two of the sites had only Allegheny crayfish present, and the remainder had rusty crayfish. On average 49% of the stomachs examined contained food across all sampled sites, but at the individual sites this ranged from 27 to 77%. Aquatic macroinvertebrates comprised most of the observed prey, and in particular mayflies. The other food item was unknown plant material. The 174 total individual stomachs ranged from 5-17 taxa, indicating substantial breadth among prey groups. We found 10 genera of mayflies represented in the stomachs, but Leucrocuta was the dominant genus. Most surprisingly, however, was our discovery of many prey species within the stomachs entirely intact. These findings suggests that these crayfish were engulfing their prey whole.
- C06 Large River Ecology
- C03 Invertebrates
- C26 Invasive Species
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Presenters/Authors
Michael Bilger
(), Susquehanna University, mdbilger@verizon.net;
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Brian Mangan
(), Kings College, brianmangan@kings.edu;
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