2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 11:30 AM - 11:45 AM | EFFECTS OF SALINITY AND TEMPERATURE ON GROWTH, SURVIVAL, AND ADULT EMERGENCE IN THE DESERT CADDISFLY LIMNEPHILUS ASSIMILIS BANKS | 151 ABC
EFFECTS OF SALINITY AND TEMPERATURE ON GROWTH, SURVIVAL, AND ADULT EMERGENCE IN THE DESERT CADDISFLY LIMNEPHILUS ASSIMILIS BANKS
Study of species from extreme environments can inform predictions of effects of salinization and changed thermal regimes resulting from climate change and various human activities. We monitored growth, survival and adult emergence in the desert caddisfly Limnephilus assimilis by holding larvae in cages over a range of salinities and temperatures. In field experiments at Salt Creek (15-18 ppt salinity) and Saratoga Springs (3 ppt) in Death Valley, CA, larval growth rates, mortality rates, and emergence did not differ significantly between habitats. Reciprocal transfers of larvae between habitats showed equal emergence at Saratoga Springs; at Salt Creek, most larvae originating at Saratoga Springs died, but a small proportion of transferred larvae emerged successfully emerged. Full factorial laboratory experiments with salinities of 1-25 ppt and temperatures of 5-25 C showed (1) 100% larval mortality at 25 C, with mortality rates increasing with salinity; (2) no successful emergence at 22 and 25 ppt salinity, with mortality rates at all salinities increasing with temperature; (3) decreasing adult emergence with increasing salinity but a small proportion of emergence at 18 and 20 ppt at low-to-moderate temperatures. Such plasticity may help species adapt to environmental change.
- Temperature
- Life History
- ClimateChange
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Presenters/Authors
Betsy Colburn
(), Harvard Forest, colburn@fas.harvard.edu;
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