Freshwater inflow: Science, policy, management

Montagna, Paul A.; Alber, Merryl; Doering, Peter H.; Connor, Michael S.

doi:10.1007/bf02692221

Cited by 72 publications

(50 citation statements)

References 13 publications

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“…In both submodels, the response to salinity was bell-shaped, peaking at 25 psu with a range of 10-40 psu; this suggests that habitat affinity is reduced at elevated salinities. This pattern is consistent across many estuarine species and indicates some potential ramifications of reduced freshwater inflow into these bay systems as historic inflows are increasingly diverted for human usage (Montagna et al 1992). In addition to providing salinity balance, freshwater inflows perform many other functions in estuaries, including the transport of sediment, nutrients, and allochthonous organic matter.…”

Section: Discussionmentioning

confidence: 54%

Two‐Stage Boosted Regression Tree Model to Characterize Southern Flounder Distribution in Texas Estuaries at Varying Population Sizes

Froeschke

2016

Mar Coast Fish

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Linking trends in fish population abundance to environmental characteristics is often difficult because fish use a variety of habitats throughout their ontogeny and may exhibit large interannual fluctuations in abundance. We developed a two‐stage boosted regression tree model to investigate spatiotemporal patterns of Southern Flounder Paralichthys lethostigma abundance and distribution in Texas estuaries. We used a 36‐year fishery‐independent data set (1977–2012) to correlate distribution with environmental conditions and seasonal or long‐term changes in abundance. Adult Southern Flounder were sampled with gill nets using a random‐stratified design. Predictions of abundance were made to grids of environmental data to identify “hot spots” as well as seasonal or decadal shifts in distribution. Models were fit using cross validation, and variance was estimated using nonparametric bootstrapping. Depth, temperature, distance to a tidal inlet, and salinity were the primary environmental determinants of Southern Flounder distribution and abundance. Because distribution and response to environmental conditions can depend on population abundance, we also developed a standardized index of annual abundance using the same two‐stage boosted regression tree model. The index identifies a long‐term decline in abundance punctuated by recent recovery (possibly in response to management actions). Mapped results identify a coastwide decline in abundance between 1980–1984 and 2005–2009 but the magnitude varied substantially, suggesting disproportionate changes in abundance across the study area. Received April 10, 2015; accepted July 28, 2015

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Section: Discussionmentioning

confidence: 54%

Two‐Stage Boosted Regression Tree Model to Characterize Southern Flounder Distribution in Texas Estuaries at Varying Population Sizes

Froeschke

2016

Mar Coast Fish

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“…Otro elemento muy importante en el funcionamiento de un estuario es el momento de la afluencia de agua dulce, dado que los organismos de los estuarios han evolucionado durante largos períodos a regímenes particulares de afluencia de agua dulce y condiciones biogeoquímicas relacionadas con ésta (Montagna et al, 2002). Los cambios en el uso del suelo, en particular las pérdidas de humedales y otras áreas que absorben y almacenan agua subterránea, pueden alterar el comportamiento de la escorrentía en una cuenca de captación y aumentar las variaciones estacionales.…”

Section: Alteración De Las Cantidades Y El Momento De La Afluencia Deunclassified

“…La meta del simposio era identificar posibles soluciones y recomendaciones para encarar los problemas de los regímenes alterados de la afluencia. Un segundo simposio se llevó a cabo en St. Petersburg Beach, Florida, en 2001, sobre el tema "Afluencia de agua dulce: Ciencia, política y manejo" (Montagna et al, 2002). El segundo simposio es significativo porque en el período intermedio de 21 años entre ambos congresos, muchos organismos comenzaron a implementar normas y regulaciones para la afluencia de agua dulce, investigaron los efectos de las normas e incluso intentaron restaurar estuarios en los cuales la afluencia se había reducido.…”

Section: Figura 5 Diagrama De Flujo Del Método Descrito En Esta Guíaunclassified

“…El segundo simposio es significativo porque en el período intermedio de 21 años entre ambos congresos, muchos organismos comenzaron a implementar normas y regulaciones para la afluencia de agua dulce, investigaron los efectos de las normas e incluso intentaron restaurar estuarios en los cuales la afluencia se había reducido. En el volumen de 2002, hay varios estudios de caso detallados sobre estuarios en Australia, Sudáfrica y Estados Unidos (Montagna et al, 2002).…”

Section: Figura 5 Diagrama De Flujo Del Método Descrito En Esta Guíaunclassified

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A Faixa Terrestre da Zona Costeira e os Recursos Hídricos na Região Hidrográfica do Atlântico Sul, Brasil

Loitzenbauer

Mendes

2014

RGCI

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“…More than 50% of fresh water is diverted inland by reservoirs, dams, or other removal processes (Postel et al 1996, Powell et al 2002. In coastal Texas, reduced freshwater inputs and extended droughts have elevated salinities in estuaries (Alber 2002, Montagna et al 2002, Powell et al 2002. The decrease in fresh water and subsequent increases in salinity affect numerous species, including blue crabs, that depend upon brackish waters with suitable habitats (Chambers 1993.…”

Section: Introductionmentioning

confidence: 99%

Ambient Malathion concentrations modify behavior and increase mortality in blue crabs

Wendel¹,

Smee²

2009

Mar. Ecol. Prog. Ser.

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Organophosphate insecticides can compromise water quality and harm non-target species unintentionally. In this study, we examined the effects of a commonly used organophosphate insecticide, Malathion, on blue crabs Callinectes sapidus, which are an economically and ecologically important estuarine species. Adult and juvenile crabs were exposed to environmentally-occurring concentrations of Malathion at 2 salinity levels to determine how these factors would affect crab behavior and mortality. Initial Malathion concentrations of 1.0 ppb and 11.2 ppb caused a significant increase in mortality of juvenile blue crabs, and concentrations of 11.2 ppb caused a significant increase in mortality of adults, all within 36 h after exposure. Our results indicated that salinity did not affect blue crabs' susceptibility to Malathion at these concentrations. We measured the time needed for adult blue crabs to right themselves when placed on their backs before and after exposure to Malathion. After 1 h of exposure to Malathion concentrations of 11.2 ppb, adult crabs took significantly longer to right themselves, indicating that short-term exposure to Malathion at ecologically relevant concentrations can interfere with essential behaviors of blue crabs. Blue crab populations have been declining in recent years, and their decline has primarily been linked to overfishing. However, other mechanisms including pollution and disease may also contribute to this problem and require further investigation. Since blue crabs are important components of estuarine food webs, changes in blue crab mortality rates and behavior may have important consequences for entire estuarine systems.

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Freshwater inflow: Science, policy, management

Cited by 72 publications

References 13 publications

Two‐Stage Boosted Regression Tree Model to Characterize Southern Flounder Distribution in Texas Estuaries at Varying Population Sizes

Two‐Stage Boosted Regression Tree Model to Characterize Southern Flounder Distribution in Texas Estuaries at Varying Population Sizes

A Faixa Terrestre da Zona Costeira e os Recursos Hídricos na Região Hidrográfica do Atlântico Sul, Brasil

Ambient Malathion concentrations modify behavior and increase mortality in blue crabs

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