

FOLLOWUS
Department of Wildland Resources and Ecology Center, Logan, UT 84322-5230, USA
mike.conover@usu.edu
Received:05 June 2022,
Accepted:27 July 2022,
Online First:29 August 2022,
Published:01 July 2023
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CONOVER Michael R.,BELL Mark E.,DELAHOUSSAYE Leah M..Viability and hatchability of brine shrimp Artemiafranciscana cysts after passing through the digestive system of eared grebes Podicepsnigricollis[J].Journal of Oceanology and Limnology,2023,41(04):1300-1306.
Brine shrimp
Artemia
franciscana
provide food for many migrating and staging birds that spend summer and fall on Great Salt Lake
Utah
USA.
Artemia
produce live young and cysts (hard-walled eggs); these cysts are commercially harvested on Great Salt Lake and support a large industry in Utah. It is unclear the impact that millions of hungry birds have on the
Artemia
population in the lake. To help assess that
this study evaluated cy
st viability (percentage of cysts that contain an embryo) and hatchability (percent of cysts that hatch) from cysts that had passed through the digestive tract of eared grebes
Podiceps
nigricollis
and cysts obtained directly from Great Salt Lake at the same site where each grebe was collected. Hatchability was significantly higher for cysts collected from the water column (19%) than from the stomach (0.3%) or intestines (3%) of eared grebes. Viability also was significantly different for cysts collected from the water column (29%)
stomach (0.7%)
and intestines (5%). These results indicate that eared grebes nutritionally benefit from eating cysts and that they may be an important food source for grebes in late fall after the adult population of
Artemia
dies off due to the water becoming too cold. Also
enough cysts survive their passage through the digestive system that grebes can vector hatchable cysts to other waterbodies.
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