2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 11:45 AM - 12:00 PM | HETEROGENEOUS FISH RECOLONIZATION ALONG A CLIMATE GRADIENT FOLLOWING HURRICANE HARVEY | 150 DEF

HETEROGENEOUS FISH RECOLONIZATION ALONG A CLIMATE GRADIENT FOLLOWING HURRICANE HARVEY

A category 4 hurricane, Harvey, made landfall in the Texas Coastal Bend on August 25, 2017 bringing extreme floods and high winds. The frequency and intensity of similar storms are expected to increase in many regions as global temperatures rise (IPCC 2018). Here, we evaluate the impact of climate drivers on fish community responses and recovery rates to this storm. Prior to and after the hurricane, we performed monthly surveys of 9 streams spanning a semi-arid to sub-humid precipitation gradient along the Texas Gulf Coast. Surveys assessed nutrients (SRP: NH4+, NO3-), water chemistry, habitat characteristics and fish communities. Fish sampling was performed using a 3-pass depletion survey design within a 75m reach bounded by block nets. Fish community assemblage dynamics were evaluated using diversity indices and non-metric multidimensional scaling. Climate drivers of fish recolonization were evaluated by correlating species and diversity recovery with environmental factors. Fish community abundances recovered quickly with varying compositional and diversity recovery rates. Our results indicate a universal flood-pulse response to disturbance in which fish communities in streams with wetter climates take more time to reestablish pre-storm community states.

Disturbance
Fish
ClimateChange

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Presenters/Authors

Sean Kinard (), Virginia Institute of Marine Science, s2kinard@gmail.com;