Contaminant Effects on California Bay–Delta Species and Human Health

Fong, Stephanie Koh Hean; Louie, Stephen; Werner, Inge; Davis, Jay A; Connon, Richard E.

doi:10.15447/sfews.2016v14iss4/art5

Cited by 12 publications

(30 citation statements)

References 71 publications

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“…However, pyrethroids adsorb to sediments and are persistent when adsorbed. In this form, pyrethroids can be carried with river borne sediments to deposition sites where they may accumulate to concentrations acutely toxic to test organisms (Fong et al 2016). …”

Section: Nutrients Are Importantmentioning

confidence: 99%

“…The situation is complicated further because much of the ammonium that enters the Delta comes from wastewater treatment plants (Jassby 2008), which discharge a myriad of other substances (some toxic) that can also inhibit plankton growth (Dahm et al 2016;Fong et al 2016). Wastewater treatment plant upgrades to eliminate ammonium may not remove other pollutants, so that the upgraded discharges may still inhibit phytoplankton growth.…”

Section: Nutrients Are Importantmentioning

confidence: 99%

“…Neonicotinoids are soluble and persist in the environment for a long time (Fong et al 2016). Acute toxicity of these pesticides in the ecosystem is rare but sublethal concentrations can contribute to population declines by, for example, making organisms more vulnerable to predation or interfering with reproduction.…”

Section: Delta Waters Are Contaminatedmentioning

confidence: 99%

“…For example, Fong et al (2016) used multi-factorial models to examine the relationship between species abundance indices in fall midwater trawls and a range of flow and waterquality variables. Pyrethroid use and flow explained the most variability in species abundance, except for Threadfin Shad (Dorosoma petenense), for which only pyrethroids were significant determinants.…”

Section: Delta Waters Are Contaminatedmentioning

confidence: 99%

“…As monitoring data accumulate, new multi-dimensional models of hydrodynamics and distribution of water constituents should become feasible (MacWilliams et al 2016;Schoellhamer et al 2016), allowing dispersal and concentrations of contaminants moving through the Delta to be predicted. Coupled with data on lethal and sublethal toxicities, species distributions, and food webs Fong et al 2016;Perry et al 2016), these tools should facilitate assessments of the species-specific and ecosystem consequences of contaminant loadings in the Delta. Such analyses would have been nearly impossible a decade ago.…”

Section: Delta Waters Are Contaminatedmentioning

confidence: 99%

See 4 more Smart Citations

Perspectives on Bay–Delta Science and Policy

Healey¹,

Dettinger²,

Norgaard³

2016

SFEWS

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Section: Nutrients Are Importantmentioning

confidence: 99%

Section: Nutrients Are Importantmentioning

confidence: 99%

Section: Delta Waters Are Contaminatedmentioning

confidence: 99%

Section: Delta Waters Are Contaminatedmentioning

confidence: 99%

Section: Delta Waters Are Contaminatedmentioning

confidence: 99%

See 3 more Smart Citations

Perspectives on Bay–Delta Science and Policy

Healey¹,

Dettinger²,

Norgaard³

2016

SFEWS

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Evaluating top‐down, bottom‐up, and environmental drivers of pelagic food web dynamics along an estuarine gradient

Rogers,

Bashevkin,

Burdi

et al. 2024

Ecology

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Identification of the key biotic and abiotic drivers within food webs is important for understanding species abundance changes in ecosystems, particularly across ecotones where there may be strong variation in interaction strengths. Using structural equation models (SEMs) and four decades of integrated data from the San Francisco Estuary, we investigated the relative effects of top‐down, bottom‐up, and environmental drivers on multiple trophic levels of the pelagic food web along an estuarine salinity gradient and at both annual and monthly temporal resolutions. We found that interactions varied across the estuarine gradient and that the detectability of different interactions depended on timescale. For example, for zooplankton and estuarine fishes, bottom‐up effects appeared to be stronger in the freshwater upstream regions, while top‐down effects were stronger in the brackish downstream regions. Some relationships (e.g., bottom‐up effects of phytoplankton on zooplankton) were seen primarily at annual timescales, whereas others (e.g., temperature effects) were only observed at monthly timescales. We also found that the net effect of environmental drivers was similar to or greater than bottom‐up and top‐down effects for all food web components. These findings can help identify which trophic levels or environmental factors could be targeted by management actions to have the greatest impact on estuarine forage fishes and the spatial and temporal scale at which responses might be observed. More broadly, this study highlights how environmental gradients can structure community interactions and how long‐term data sets can be leveraged to generate insights across multiple scales.

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Determining the Exposure Pathway and Impacts of Microcystis on Threadfin Shad, Dorosoma petenense, in San Francisco Estuary

Acuña¹,

Baxa

Lehman³

et al. 2020

Enviro Toxic and Chemistry

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Blooms of the cyanobacterium Microcystis spp. could affect fish health through the ingestion of colonies as well as exposure to dissolved microcystins in the water column. The goal of the present study was to evaluate the dietary exposure pathway through which Microcystis spp. blooms may affect liver function and nutritional status using a novel approach involving multiple analytical methods to assess the potential risk. Our study was conducted using threadfin shad, Dorosoma petenense, which is a pelagic fish commonly exposed to Microcystis spp. blooms in the upper San Francisco Estuary. The approach incorporated published and optimized methods that offer multiple lines of evidence including in situ hybridization, immunohistochemistry, histopathology, condition factor indices, and nutritional profiles. Measurements of threadfin shad health and tissue condition were conducted at sites where Microcystis was present or absent during the 2007 bloom season. The results showed that dietary exposure to fish from Microcystis blooms resulted in the accumulation of microcystin in the gut and liver tissues of threadfin shad collected from the sites with blooms. Although toxicity endpoints were likely confounded by antecedent conditions, our findings demonstrate dietary exposure of Microcystis toxins to fish using a novel approach with multiple lines of evidence. Environ Toxicol Chem 2020;39:787–798. © 2020 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals, Inc. on behalf of SETAC.

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Contaminant Effects on California Bay–Delta Species and Human Health

Cited by 12 publications

References 71 publications

Perspectives on Bay–Delta Science and Policy

Perspectives on Bay–Delta Science and Policy

Evaluating top‐down, bottom‐up, and environmental drivers of pelagic food web dynamics along an estuarine gradient

Determining the Exposure Pathway and Impacts of Microcystis on Threadfin Shad, Dorosoma petenense, in San Francisco Estuary

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