NDLI: Explaining Patterns of Pelagic Fish Abundance in the Sacramento-San Joaquin Delta

Content Provider	Springer Nature Link
Author	Latour, Robert J.
Copyright Year	2015
Abstract	Investigating the effects of environmental, biological, and anthropogenic covariates on fish populations can aid interpretation of abundance and distribution patterns, contribute to understanding ecosystem functioning, and assist with management. Studies have documented declines in survey catch per unit effort (CPUE) of several fishes in the Sacramento-San Joaquin Delta, a highly altered estuary on the US west coast. This paper extends previous research by applying statistical models to 45 years (1967–2012) of trawl survey data to quantify the effects of covariates measured at different temporal scales on the CPUE of four species (delta smelt, Hypomesus transpacificus; longfin smelt, Spirinchus thaleichthys; age-0 striped bass, Morone saxatilis; and threadfin shad, Dorosoma petenense). Model comparisons showed that along with year, the covariates month, region, and Secchi depth measured synoptically with sampling were all statistically important, particularly in explaining patterns in zero observations. Secchi depth and predicted CPUE were inversely related for all species indicating that water clarity mediates CPUE. Model comparisons when the year covariate was replaced with annualized biotic and abiotic covariates indicated total suspended solids (TSS) best explained CPUE trends for all species, which extends the importance of water clarity on CPUE to an annual timescale. Comparatively, there was no empirical support for any other annualized covariates, which included metrics of prey abundance, other water quality parameters, and water flow. Top-down and bottom-up forcing remain important issues for understanding delta ecosystem functioning; however, the results of this study raise new questions about the effects of changing survey catchability in explaining patterns in pelagic fish CPUE.
Starting Page	233
Ending Page	247
Page Count	15
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	39
Issue Number	1
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2015-04-14
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Delta and longfin smelt Sacramento-San Joaquin Delta Zero-inflated generalized linear models Water flow Zooplankton Water quality Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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California nevada fish health center (2006).

Implications for Future Survival of Delta Smelt from Four Climate Change Scenarios for the Sacramento–San Joaquin Delta, California

Long-Term Seasonal Trends in the Prey Community of Delta Smelt (Hypomesus transpacificus) Within the Sacramento-San Joaquin Delta, California

Effects of River Flow on Abundance of Young Chinook Salmon , American Shad , Longfin Smelt , and Delta Smelt in the Sacramento-San Joaquin River System DOr ~ ALD

Pelagic organism decline (pod): acute and chronic invertebrate and fish toxicity testing in the sacramento-san joaquin delta (2010).

Modeling the Effects of Future Outflow on the Abiotic Habitat of an Imperiled Estuarine Fish

Pelagic organism decline (pod): acute and chronic invertebrate and fish toxicity testing in the sacramento-san joaquin delta (2009).

Long-Term Seasonal Trends in the Prey Community of Delta Smelt (Hypomesus transpacificus) Within the Sacramento-San Joaquin Delta, California

Peer Reviewed Title: Losses of Sacramento River Chinook Salmon and Delta Smelt to Entrainment in Water Diversions in the Sacramento-San Joaquin Delta Journal Issue:

Explaining Patterns of Pelagic Fish Abundance in the Sacramento-San Joaquin Delta

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California nevada fish health center (2006).

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Long-Term Seasonal Trends in the Prey Community of Delta Smelt (Hypomesus transpacificus) Within the Sacramento-San Joaquin Delta, California

Effects of River Flow on Abundance of Young Chinook Salmon , American Shad , Longfin Smelt , and Delta Smelt in the Sacramento-San Joaquin River System DOr ~ ALD

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Peer Reviewed Title: Losses of Sacramento River Chinook Salmon and Delta Smelt to Entrainment in Water Diversions in the Sacramento-San Joaquin Delta Journal Issue:

Explaining Patterns of Pelagic Fish Abundance in the Sacramento-San Joaquin Delta