Nutrient Enrichment Studies in a Coastal Plain Estuary: Changes in Phytoplankton Species Composition

Sanders, James G.; Cibik, S. J.; D’Elia, Christopher F.; Boynton, Walter R.

doi:10.1139/f87-010

Cited by 66 publications

(39 citation statements)

References 20 publications

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“…The phytoplankton in these mesocosms may have had changes in their size and/or species composition. Sanders et al (1987) reported large changes in dominant phytoplankton species and patterns of succession during nutrient enrichment experiments in the Patuxent River, Chesapeake Bay, USA. They concluded that nutrient enrichment promoted diatom dominance particularly during the summer and early fall.…”

Section: Biomassmentioning

confidence: 99%

Estimating phytoplankton productivity from light availability and biomass in the MERL mesocosms and Narragansett Bay

Keller¹

1988

Mar. Ecol. Prog. Ser.

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Recent research has suggested that primary productivity in estuanne waters can be predicted as a function of phytoplankton biomass (chlorophyll a concentration) multiplied by light avalability in the photic zone (photic depth times incident irradiance). The apphcability of this function was confirmed using data from 1010 I4C incubations (during 1978 to 1984) from 4 diverse mesocosm experiments and Narragansett Bay. For each experiment 70 to 80 % of the variation in productivity was explained by the composite function. A regression equation developed from all experiments explained 82 % of the variation in primary productivity and was not statistically different from a previously reported equation based on comparable data from 4 estuarine regions (North and South San Francisco Bay, Puget Sound, and New York Bight). Phytoplankton production was correlated with biomass alone on a seasonal basis (summer, r = 0.87; non-summer, r = 0.77), with chlorophyll-specific productivity higher during summer (June to September) than non-summer (October to May). The decline in the slope of the relation between production and biomass during non-summer periods corresponded to the seasonal switch from summer dominance by nanoplankton (primarily flagellates) to non-summer dominance by net plankton (primarily diatoms) and coincided with decreased light availability in the photic zone. Annual productivity was also highly correlated with the mean annual product of chlorophyll a, photic depth and incident light ( r = 0.96).

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Section: Biomassmentioning

confidence: 99%

Estimating phytoplankton productivity from light availability and biomass in the MERL mesocosms and Narragansett Bay

Keller¹

1988

Mar. Ecol. Prog. Ser.

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“…Transmission of stressor effects to higher trophic levels should depend on the relationship between stressor effects and species composition of trophic levels susceptible to direct effects, the presence of complementary responses within those trophic levels (Frost et al 1995), and on feeding specificity and feeding relationships among organisms throughout the rest of the food web (Sanders et al 1994;Breitburg et al 1997). Where only certain taxa or trophic levels are susceptible to direct effects of stressors, the importance of particular species as prey and the potential for nutritionally similar species to exhibit complementary responses (e.g., increase while other species decrease) may determine whether stressor effects are dampened or magnified throughout the food web (Frost et al 1995;Riegman 1995).…”

mentioning

confidence: 99%

“…Increased nutrient and contaminant loadings, which can lead to enrichment and(or) degradation of the system, have been of concern in many estuaries and coastal systems (e.g., Gray and Paasche 1984;Hecky and Kilham 1988;Howarth 1988;Malone et al 1993;Cloern 1996;Sanders and Riedel 1998). Increases in both nutrients and trace metals in coastal waters reflect the general increase in anthropogenic activities in the coastal zone.…”

mentioning

confidence: 99%

“…For example, 75% of the U.S. population will live within 75 km of the coastline by 2010 (Williams et al 1991). The response to increased nutrient loadings can be increased productivity and phytoplankton standing stock (and the attendant problems associated with system eutrophication), but in addition, increased loadings and changes in nutrient ratios or chemical form can also change phytoplankton species composition, dominance, and succession (Turpin and Harrison 1979;Schelske and Stoermer 1971;Goldman and Stanley 1974;Sanders et al 1987;Maestrini and Bonin 1981;Oviatt et al 1989;Riegman 1995). Because phytoplankton species exhibit differing requirements for the various nutrients, community structure changes as the relative nutrient concentrations and fluxes change (Tilman 1977(Tilman , 1980Kilham and Kilham 1984).…”

mentioning

confidence: 99%

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Variability in responses to nutrients and trace elements, and transmission of stressor effects through an estuarine food web

Breitburg¹,

Sanders²,

Gilmour³

et al. 1999

Limnology & Oceanography

Self Cite

112

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Aquatic systems are increasingly exposed to multiple stressors from anthropogenic sources. These stressors can vary in the consistency and magnitude of responses they elicit in biota and in how the presence of additional stressors modifies their effects. Understanding how the biological environment and temporal dynamics influence responses to stressors, and how stressors interact, is important to predicting their effects in the natural environment. We examined temporal variability in responses of an experimental estuarine food web to elevated trace elements and nutrients, as well as non-additive effects of the combination of these two stressors. Experiments were conducted four times during spring through autumn 1996 in 20 l-m 3 mesocosms. We measured a range of system-, population-, and individual-level parameters to quantify responses of phytoplankton, bacterioplankton, heterotrophic nanoflagellates, copepods, fish, and benthic invertebrates to trace element and nutrient additions.The response to trace element additions was more variable both temporally and among phytoplankton and higher trophic level taxa than was the response to nutrient additions. Most taxa increased, either significantly or showed a trend toward increasing, in response to nutrient additions in all four mesocosm runs. In contrast, the direction as well as the magnitude of responses to trace element additions varied considerably among taxa and experimental runs. Two distinct types of nutrientϫtrace element interactions were important. First, temporal dynamics of nutrient ratios appeared to affect the temporal pattern of toxicity of trace elements to phytoplankton. Second, in the June mesocosm run when trace element additions reduced production, abundance, or growth of many organisms, these reductions were often proportionately greater in nutrient addition tanks than where no nutrients were added. Our results suggest that considerable temporal and taxonomic variation in responses to trace element loadings are likely to be seen in field settings even under constant loadings to the system and that trace elements may mask the magnitude of the response to high nutrient loadings in eutrophic systems. More generally, the presence of multiple stressors may either increase or dampen the temporal and spatial variability seen in aquatic systems, depending on the interactions among stressors and the influence of background environmental conditions and sensitive species on the expression of stressor effects.Stressors vary considerably in the specificity of their effects; some stressors may affect nearly all organisms within AcknowledgmentsWe thank B. Albright, D. Butera, L. Cole, D. Connell, R. DeKorsey, T. Huber, A. Imirie, S. Sellner, J. Smallwood, M. Ward, M. Weinstein, T. Wiegner, and W. Yates for their help in running experiments and data analysis; S. Nixon, S. Grainger, and E. Buckley for suggestions on mesocosm design and unpublished data from their seagrass mesocosm experiments; M. Bundy for advice on copepod feeding strategies; E. Perry f...

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“…(SANDERS et al, 1987), como pode ser verificado em outros estudos com resultados similares (CASÉ et al, 2008;SILVA et al, 2011;CHELLAPA;LIMA;CÂMARA, 2007).…”

Section: Parâmetros Biológicosunclassified

Padrões hidrobiológicos como indicadores ambientais em águas afluentes e efluentes de viveiros de carcinicultura marinha no estado do Ceará

Bezerra

Lustosa

Neto³

et al. 2016

Rev. Bras. Ciênc. Ambient. (Online)

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RESUMOUma das formas de verificar os impactos ambientais da criação de camarões (carcinicultura) é pela análise sistêmica das águas afluentes e efluentes de seus viveiros de produção. O objetivo deste trabalho foi caracterizar afluentes e efluentes da carcinicultura por meio de seus parâmetros físicos, químicos e biológicos e suas concentrações, adotando um regime temporal de coleta de amostras nas diferentes estações climáticas do ano. As metodologias e os padrões de referência na pesquisa estão respaldados pela legislação ambiental vigente. Os resultados indicaram que não houve diferenças significativas entre as concentrações dos parâmetros avaliados das águas afluentes e efluentes. Indicaram também a inaplicabilidade da legislação ambiental em vigor, que não considera nossas particularidades ambientais regionais, já que algumas concentrações dos parâmetros de qualidade de afluentes se encontram em desconformidade com essa legislação, o que tem causado dificuldades na avaliação ambiental dos órgãos licenciadores sobre a atividade no Ceará.Palavras-chave: qualidade de água; indicadores; carcinicultura. ABSTRACTOne of the ways to verify environmental impacts of shrimp farming is through the systemic analysis of influent and effluents waters ponds. The aim of this work was to characterize these variables through its physical, chemical and biological parameters and their concentrations, adopting a temporal scheme of samples collection in different climate stations of the year. Methodologies and reference standards in research are supported by current environmental legislation. Results showed that there were no significant differences between the concentrations of these parameters between the influent and effluent waters. They, furthermore, indicate a inapplicability of current environmental legislation in Brazil, which does not consider our regional environmental characteristics, because the quality of the affluent waters were already in disagreement with the Brazilian environmental legislation, which has caused conflicts of interpretation in the environmental assessment of the shrimp culture in Ceará, Brazil.

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Nutrient Enrichment Studies in a Coastal Plain Estuary: Changes in Phytoplankton Species Composition

Cited by 66 publications

References 20 publications

Estimating phytoplankton productivity from light availability and biomass in the MERL mesocosms and Narragansett Bay

Estimating phytoplankton productivity from light availability and biomass in the MERL mesocosms and Narragansett Bay

Variability in responses to nutrients and trace elements, and transmission of stressor effects through an estuarine food web

Padrões hidrobiológicos como indicadores ambientais em águas afluentes e efluentes de viveiros de carcinicultura marinha no estado do Ceará

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