Review of and Recommendations for Monitoring Contaminants and their Effects in the San Francisco Bay−Delta

San Francisco Estuary and Watershed Science, Год журнала: 2019, Номер 17(4)

Опубликована: Дек. 8, 2019

Legacy and current-use contaminants enter into accumulate throughout the San Francisco Bay−Delta (Bay−Delta), are present at concentrations with known effects on species important to this diverse watershed. There remains major uncertainty a lack of focused research able address provide understanding across multiple biological scales, despite previous ongoing emphasis need for it. These needs challenging specifically because established regulatory programs that often monitor chemical-by-chemical basis, or in which decisions grounded lethality-based endpoints. To best issues Bay−Delta, monitoring efforts should consider environmentally relevant mixtures sub-lethal impacts can affect ecosystem health. complex environment including variable abiotic (e.g., temperature, salinity) biotic pathogens) factors. This calls controlled research, development multi-disciplinary contaminant assessment program provides information scales. Information gained manner will contribute toward evaluating parameters could alleviate ecologically detrimental outcomes. review is result Special Symposium convened University California−Davis (UCD) January 31, 2017 critical needed how Bay−Delta. The UCD new tools approaches assessing stressor freshwater estuarine systems. Our approach similar recently proposed framework laid out by U.S. Environmental Protection Agency (USEPA) uses weight evidence scale toxicological responses chemical laboratory, guide conservation priority habitats. As such, we also aimed recommend endpoints be used promote risks while supporting management needs.

Язык: Английский

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Influence of protogynous sex change on recovery of fish populations within marine protected areas

Ecological Applications, Год журнала: 2020, Номер 30(3)

Опубликована: Янв. 6, 2020

Marine protected areas (MPAs) are increasingly implemented as a conservation tool worldwide. In many cases, they managed adaptively: the abundance of target species is monitored, and observations compared to some model-based expectation for trajectory population recovery ensure that MPA achieving its goals. Most previous analyses transient (short-term) response populations cessation fishing inside MPAs have dealt only with gonochore (fixed-sex) species. However, important fishery protogynous hermaphrodites (female-to-male sex-changing). Because size-selective harvest will predominantly males in these species, harvesting not reduces but also skews sex ratio toward females. Thus implementation involve changes both survival ratio, ultimately reproductive output. We used an age-structured model generic sex-changing fish compare dynamics after those otherwise similar examine how different features life history affect dynamics. examined demographically open (most larval recruitment comes from outside MPA) closed locally produced) Under scenarios, takes longer when was more intense pre-MPA (as gonochores), depends heavily on mating function, degree which affects reproduction. If few needed reproduction affected by highly female-biased then much faster; if limiting resource, increases slower than gonochores. Unfortunately, function largely unknown fishes. general, we expect most haremic systems be first category (few needed), though there at least one example (though species) limiting. better understanding importance male adaptive management MPAs.

Язык: Английский

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Ecological risk assessment of environmental stress and bioactive chemicals to riverine fish populations: An individual-based model of smallmouth bass Micropterus dolomieu✰

Ecological Modelling, Год журнала: 2020, Номер 438, С. 109322 - 109322

Опубликована: Окт. 15, 2020

Язык: Английский

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Environmentally relevant concentrations of bifenthrin affect the expression of estrogen and glucocorticoid receptors in brains of female western mosquitofish

Aquatic Toxicology, Год журнала: 2018, Номер 209, С. 121 - 131

Опубликована: Дек. 17, 2018

Язык: Английский

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Accounting for transgenerational effects of toxicant exposure in population models alters the predicted long-term population status

Current Zoology, Год журнала: 2022, Номер 8(1)

Опубликована: Янв. 1, 2022

Abstract Acute environmental stressors such as short-term exposure to pollutants can have lasting effects on organisms, potentially impacting future generations. Parental toxicants result in changes the epigenome (e.g., DNA methylation) that are passed down subsequent, unexposed However, it is difficult gauge cumulative population-scale impacts of epigenetic from laboratory experiments alone. Here, we developed a size- and age-structured delay-coordinate population model evaluate long-term consequences modifications sustainability. The emulated growth, mortality, fecundity F0, F1, F2 generations observed which larval Menidia beryllina were exposed environmentally relevant concentrations bifenthrin (Bif), ethinylestradiol (EE2), levonorgestrel (LV), or trenbolone (TB) parent generation (F0) reared clean water up generation. Our analysis suggests dramatic population-level repeated, chronic exposures early-life stage fish not captured by models accounting for those effects. Simulated led substantial declines abundance (LV Bif) near-extinction (EE2 TB) with exact trajectory timeline decline dependent combination produced each compound. Even acute one-time compound recovery over multiple years due lagged These results demonstrate potential commonly used compounds impact dynamics sustainability an ecologically species organism.

Язык: Английский

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