2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | A STATE-SPACE APPROACH TO SCALING SPECIES-LEVEL RESPONSES TO HYDROCLIMATIC VARIABILITY TO COMMUNITY-LEVEL STABILITY OVER FOUR DECADES IN AN ESTUARY | Virtual Platform
A STATE-SPACE APPROACH TO SCALING SPECIES-LEVEL RESPONSES TO HYDROCLIMATIC VARIABILITY TO COMMUNITY-LEVEL STABILITY OVER FOUR DECADES IN AN ESTUARY
In the San Francisco Estuary, the relative magnitude of marine vs. freshwater influences on ecosystem dynamics varies with hydroclimate patterns. Quantitatively scaling species-level responses to community-level stability remains a challenge due to variation in estuarine monitoring methodology. We applied a state-space approach to model juvenile fish community dynamics and the influence of hydroclimatic fluctuations and trends to answer the following questions: How does juvenile fish abundance vary along the estuarine gradient over time? How do watershed hydrology and ocean conditions explain interannual variation in species abundance? We examined 20 common age-0 fishes sampled at 35 core stations from 1980 to 2019. Overall, mean annual river flows best explained community-wide abundance fluctuations. Notably, anadromous species responded similarly, with significant positive responses to flow (‘freshening’) in the lower estuary, whereas marine-dependent species displayed the opposite pattern, with significant negative responses to flow (‘salinity intrusion’) in the upper estuary. Here we explore the life-history mechanisms that may confer response diversity--and thus temporal stability--at the community level. This work may advance the notion that directional trends, fluctuations, and extremes in hydroclimate will continue to reshape estuarine fish communities in the future.
- Vertebrates
- Monitoring
- Flow regime
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Presenters/Authors
Denise Colombano
(), University of California Berkeley, denise.colombano@berkeley.edu;
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Stephanie Carlson
(), Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, U.S., smcarlson@berkeley.edu;
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James Hobbs
(), California Department of Fish and Wildlife, james.hobbs@wildlife.ca.gov;
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Albert Ruhi
(), Department of Environmental Science, Policy, and Management, University of California Berkeley, albert.ruhi@berkeley.edu;
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