2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 3:15 PM - 3:30 PM | THERMAL LIMITS AND RESILIENCE OF HYDROPSYCHIDAE IN FIRE-AFFECTED ARID SOUTHWESTERN STREAMS | 254 B
THERMAL LIMITS AND RESILIENCE OF HYDROPSYCHIDAE IN FIRE-AFFECTED ARID SOUTHWESTERN STREAMS
Landscape disturbances of wildfire can have dramatic effects on the thermal regime of aquatic systems. Aquatic ectotherms must cope with thermal variability as habitat temperatures are repeatedly modified by indirect fire effects that include overland flow, flood pulses, and heavy sediment loads that alter stream morphology and water quality.
In 2011, the Las Conchas wildfire burned one-third of the Valles Caldera National Preserve in northern New Mexico. Streams within the Preserve were differentially affected with some exhibiting continued channel alteration, turbidity, and highly variable temperature regimes seven years post-fire. The objective of this research was to characterize the effects of disturbance-altered thermal regime on larval Hydropsyche oslari growth. Preliminary results suggest that chronically-altered streams yield reduced H. oslari biomass and affect timing of emergence that is asynchronous with recovered streams. High maximum daily temperatures and diel temperature variability appear to be negatively correlated with instantaneous growth rates. Defining temperature metrics that affect the growth and development of ectothermic invertebrates are important to understanding the responses of aquatic biota to wildfires.
- Temperature
- Invertebrate
- Secondary Production
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Presenters/Authors
Lauren Kremer
(), New Mexico State University, lkremer@nmsu.edu;
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