Effects of hypoxia, and the balance between hypoxia and enrichment, on coastal fishes and fisheries

Breitburg, Denise L.

doi:10.1007/bf02804904

Cited by 432 publications

(266 citation statements)

References 62 publications

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“…It has been postulated that the sardine decline is related to the aggravated oxygen condition in the spawning areas on the Namibian shelf Kreiner et al, 2009). Early stages of small pelagics are known to be sensitive to low oxygen (Palomera, 1991;Breitburg, 1994Breitburg, , 2002, so a key factor to explain decreasing stocks could lie in the early stages' inability to cope with low DO in the surface layer. Additional species in decline include horse mackerel (Trachurus spp.…”

Section: Northern Benguela Upwelling Systemmentioning

confidence: 99%

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

et al. 2010

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Abstract. Dissolved oxygen (DO) concentration in the water column is an environmental parameter that is crucial for the successful development of many pelagic organisms. Hypoxia tolerance and threshold values are species-and stagespecific and can vary enormously. While some fish species may suffer from oxygen values of less than 3 mL O 2 L −1 through impacted growth, development and behaviour, other organisms such as euphausiids may survive DO levels as low as 0.1 mL O 2 L −1 . A change in the average or the range of DO may have significant impacts on the survival of certain species and hence on the species composition in the ecosystem with consequent changes in trophic pathways and productivity.Evidence for the deleterious effects of oxygen depletion on pelagic species is scarce, particularly in terms of the effect of low oxygen on development, recruitment and patterns of migration and distribution. While planktonic organisms have to cope with variable DOs and exploit adaptive mechanisms, nektonic species may avoid areas of unfavourable DO and develop adapted migration strategies. Planktonic organisms may only be able to escape vertically, above or beneath the Oxygen Minimum Zone (OMZ). In shallow areas only the surface layer can serve as a refuge, but in deep waters many organisms have developed vertical migration strategies to use, pass through and cope with the OMZ.Correspondence to: W. Ekau (wekau@zmt-bremen.de) This paper elucidates the role of DO for different taxa in the pelagic realm and the consequences of low oxygen for foodweb structure and system productivity. We describe processes in two contrasting systems, the semi-enclosed Baltic Sea and the coastal upwelling system of the Benguela Current to demonstrate the consequences of increasing hypoxia on ecosystem functioning and services.

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Section: Northern Benguela Upwelling Systemmentioning

confidence: 99%

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

et al. 2010

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“…Even the quantities of organic matter quantities can trigger a hypoxia process when the photosynthesis stops at night. Dissolved oxygen is used as indicator to evaluate the health on aquatic system, because the hypoxia or anoxia has a significant effect (Breitburg, 2002).…”

Section: Dissolved Oxygenmentioning

confidence: 99%

Pollution in the estuary of the Baracoa river, La Habana, Cuba

et al. 2011

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The environmental quality of the Baracoa river estuary was studied from the physic (temperature and salinity), chemic variables (dissolved oxygen, oxygen biochemical demand (DBO), oxygen chemical demand (DQO), nitrogen cycle, inorganic phosphorus and total phosphorus) and the microbiological variables (total and thermotolerant coliforms and faecal streptococci). The samplings were made on February 2006, May and October 2007. Spatial distribution of the physical and chemical parameters measured suggests that the estuary is dominated by the marine conditions. The salinity and temperature analyses show that in general the characteristics of the estuary could be influenced by the contribution of the river basin drainage. In general, the concentrations of the measured parameters in the Baracoa river estuary, strongly suggest that this area is under influence of human activities on the river basin, due to the low levels of dissolved oxygen and an oxygen average deficit of -1.6 mg/L. nthropogenic actions in this estuary are mainly related to the emission of domestic and farming rejects without suitable treatment. This is visibly associated with the observed values of the total coliforms concentrations as well as the concentration of faecal streptococci, that surpassed reference values from the Cuban norm for water quality, following on bad or doubtful quality levels pointing out negatively measurements made next to the communication channel the estuary and the El Doctor lagoon.Keywords: environmental quality; estuary; river; physic and chemical variables; microbiological variables. Poluição no estuário do rio Baracoa, La Habana, Cuba RESUMONeste trabalho foi analisada a qualidade ambiental do estuário do rio Baracoa por meio das variáveis físico-químicas (oxigênio dissolvido, a demanda bioquímica de oxigênio -DBO, demanda química do oxigênio -DQO, ciclo de nitrogênio, fósforo inorgânico e fósforo total) e as variáveis microbiológicas (coliformes totais e coliformes termotolerantes e estreptococos fecais). As amostragens foram feitas em fevereiro de 2006, maio e outubro de 2007. A distribuição espacial dos parâmetros medidos sugere que o estuário é dominado pelas condições marinhas. As análises de temperatura e salinidade mostram que as características do estuário poderiam ser influenciadas pelas contribuições da drenagem da bacia através das chuvas. Em geral, as concentrações dos parâmetros medidos no estuário do rio Baracoa, sugerem que essa área é impactada pelas atividades humanas na bacia do rio, devido aos baixos níveis de oxigênio dissolvido e a média do déficit de oxigênio de -1.6 mg/L. As GÓMEZ, L. S. C.; PERIGÓ, E.; PIÑEIRO, R.; SOMOZA, R. D. Pollution in the estuary of the Baracoa river, La Habana, Cuba. Ambi-Agua, Taubaté, v. 6, n. 1, p. 54-64, 2011

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“…However, isolating the effect of any ecological stress on different types of fish stocks has proven highly complicated for a variety of reasons. For example, low oxygen concentrations has been affecting a wide range of aquatic systems around the world spanning from large water zones in the middle of oceans to small lakes (Breitburg, 2002). Hypoxia or low oxygen concentrations can develop in different parts of water systems because of a number of interrelated factors such as complex hydrological features, shapes and dimensions of water basins, nutrient supplies, and food web dynamics (Breitburg et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Given the interdisciplinary nature of the phenomenon, marine hypoxia has generated a widespread interest among scientists in different disciplines (for example, see Eby and Crowder (2002);Breitburg (2002); Borsuk et al, (2004); Taylor and Eggleston (2004)). Scientific studies have found evidence that hypoxia can affect different fish species in various ways such growth and mortality (for example, Peterson et al, 2000;Miller et al, 2002;Stierhoff et al, 2009;Thomas et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Time series effects of dissolved oxygen and nitrogen on Long Island Sound lobster harvest

2016

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Abstract:The formation of hypoxic water zones in marine ecosystems across the world is a growing concern among marine scientists and regulatory agencies that focus on marine resource management. In the United States, a number of water systems such as the Gulf of Mexico, Long Island Sound, and the Chesapeake Bay experience hypoxic conditions annually. Nutrient rich water with excessive nitrogen content is widely recognized as a key anthropogenic cause that lead to development of hypoxic zones. While the dissolved oxygen level indicates the presence of hypoxic water conditions, at any given time, the aquatic nitrogen concentration indicates the possibility of formation of hypoxic zones in future time periods. Hence, understanding the effects of both these variables on current and future fish population is important for improved water quality management and sustainability of marine resources. In this paper, we estimate the temporal effects of these two key variables on lobster harvest from three contiguous fishing zones in the Long Island Sound that vary in ambient water quality. We find there is no contemporaneous effect of these variables on harvest in both the zone that experience hypoxia and the two zone that do not. While there is some evidence of lagged effects of these variables on harvest, no systematic pattern emerges in these effects that distinguishes the hypoxic fishing zone with non-hypoxic zones.

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Effects of hypoxia, and the balance between hypoxia and enrichment, on coastal fishes and fisheries

Cited by 432 publications

References 62 publications

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

Pollution in the estuary of the Baracoa river, La Habana, Cuba

Time series effects of dissolved oxygen and nitrogen on Long Island Sound lobster harvest

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