Overview of anthropogenically-induced hypoxic effects on marine benthic fauna

Díaz, Robert J.; Rosenberg, Rutger

doi:10.1029/ce058p0129

Cited by 25 publications

(13 citation statements)

References 69 publications

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“…Dissolved oxygen concentration in ocean waters has gained increasing global attention in recent years as the number and expanse of hypoxic zones (DO < 1.4 mL L −1 ) have increased (Diaz and Rosenberg, , ). Seasonal hypoxic conditions occur off the coast of Washington State on the mid‐ to outer shelf and occasionally the inner shelf, according to Connolly et al .…”

Section: Introductionmentioning

confidence: 97%

Distribution patterns ofPacific halibut (Hippoglossus stenolepis) in relation to environmental variables along the continental shelf waters of theUS WestCoast and southernBritishColumbia

Sadorus

Mantua

Essington

et al. 2014

Fisheries Oceanography

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Knowing how Pacific halibut (Hippoglossus stenolepis) distribute in relation to ocean conditions is of primary importance to halibut managers, as they are tasked with estimating stock size and designing effective monitoring programs amidst a changing climate. This research examined near‐bottom environmental data alongside halibut survey catch data for the years 2006–2009 on the continental shelf of Oregon, Washington, and southern British Columbia. The objectives of the research were to: (1) characterize summer environmental conditions and halibut distribution; (2) explore ranges and possible tolerance thresholds for halibut in relation to temperature, dissolved oxygen (DO), salinity, and pH; and (3) identify the primary environmental factors affecting distribution of halibut and model the observed relationships. Seasonal hypoxia is an annual feature of the study area and results suggest halibut exhibited an apparent DO minimum threshold of 0.9 mL L−1. Ordinary least squares multiple regression analysis indicated that depth, temperature, and DO were significant variables in predicting halibut distribution, whereas salinity and bottom type were not. Ambiguity in model results led to the use of two additional analytical methods, geographically weighted regression (GWR) and tree regression, to examine regional variation and the overarching structure of halibut distribution. The three models yielded similar results indicating the importance of DO and temperature as variables describing structure. The GWR model yielded the best fit of the three when using DO as a predictor variable, indicating that regional variation is a factor. These results suggest that low, but above‐threshold, DO may be contributing to catchability differences in the survey.

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Section: Introductionmentioning

confidence: 97%

Distribution patterns ofPacific halibut (Hippoglossus stenolepis) in relation to environmental variables along the continental shelf waters of theUS WestCoast and southernBritishColumbia

Sadorus

Mantua

Essington

et al. 2014

Fisheries Oceanography

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“…Severe eutrophication may facilitate hypoxic or even anoxic conditions, which would favour changes in the species composition of benthic communities even more (cf. Diaz and Rosenberg, 2001;Wetzel et al, 2001). Species with high tolerance to oxygen deficiency and to sulphide are favoured (e.g.…”

Section: Tablementioning

confidence: 99%

Artificial structures in sediment-dominated estuaries and their possible influences on the ecosystem

Wetzel

Scholle

Teschke

2014

Marine Environmental Research

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a b s t r a c tArtificial substrates are omnipresent today in most estuaries mostly in form of massive rip-rap used for groynes and jetties. In the Weser estuary, Germany, 60% of the shoreline is covered with such artificial substrates while, natural rocky substrate is lacking, as in all Wadden Sea estuaries. This large quantity of artificial substrates may be colonized by a benthic hard-substrate community which differs from the local natural soft-substrate assemblage. In this study we examined species compositions, abundances, biomass, and numbers of species of subtidal benthic communities on groynes and in the natural habitat, the sediment, along the salinity gradient of the Weser estuary. Species composition changed on both substrates significantly with salinity and was also significantly different between the substrates. In a comparison with the sediment, the groynes did not provide any benefit for non-indigenous nor for endangered species in terms of abundance, biomass, and number of species, but represent habitats with higher total abundances and biomass; though some non-indigenous species even occurred exclusively on groynes. In particular, groynes supported filter-feeding organisms which play an important role by linking benthic and pelagic food webs. The dominance of the suspension feeders affects crucial estuarine ecosystem services and may have important implications for the estuarine management by altering the estuarine ecological quality status. Hence, artificial substrates should be considered in future conservation planning and in ecological quality monitoring of the benthic fauna according to the European Water Framework Directive.

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“…Baltic Sea and Black Sea), but more often shallow environmental hypoxia will be seasonal, episodic or short term, resulting when nutrient or sewage loading, drainage, temperature and biotic cycles interact (e.g. Gulf of Mexico, Chesapeake Bay, Scandinavian waters) (Diaz & Rosenberg 2001, Gray et al 2002, Karlson et al 2002. Cycles of hypoxia may also occur at higher frequency in specific habitats such as intertidal sediments or rock pools during low tide (Gordon 1960).…”

Section: )mentioning

confidence: 99%

Oxygen Minimum Zone Benthos: Adaptation and Community Response to Hypoxia

Levin

2003

Oceanography and Marine Biology, an Annual Review, Volume 41

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Mid-water oxygen minima (Ͻ0.5 ml l Ϫ1 dissolved O 2 ) intercept the continental margins along much of the eastern Pacific Ocean, off west Africa and in the Arabian Sea and Bay of Bengal, creating extensive stretches of sea floor exposed to permanent, severe oxygen depletion. These seafloor oxygen minimum zones (OMZs) typically occur at bathyal depths between 200 m and 1000 m, and are major sites of carbon burial along the continental margins. Despite extreme oxygen depletion, protozoan and metazoan assemblages thrive in these environments. Metazoan adaptations include small, thin bodies, enhanced respiratory surface area, blood pigments such as haemoglobin, biogenic structure formation for stability in soupy sediments, an increased number of pyruvate oxidoreductases, and the presence of sulphide-oxidising symbionts. The organic-rich sediments of these regions often support mats of large sulphideoxidising bacteria (Thioploca, Beggiatoa, Thiomargarita), and high-density, low-diversity metazoan assemblages. Densities of protistan and metazoan meiofauna are typically elevated in OMZs, probably due to high tolerance of hypoxia, an abundant food supply, and release from predation. Macrofauna and megafauna often exhibit dense aggregations at OMZ edges, but depressed densities and low diversity in the OMZ core, where oxygen concentration is lowest. Taxa most tolerant of severe oxygen depletion (Ͻ0.2 ml l Ϫ1 ) in seafloor OMZs include calcareous foraminiferans, nematodes, and annelids. Agglutinated protozoans, harpacticoid copepods, and calcified invertebrates are typically less tolerant. High dominance and relatively low species richness are exhibited by foraminiferans, metazoan meiofauna, and macrofauna within OMZs. At dissolved oxygen concentrations below 0.15 ml l Ϫ1 , bioturbation is reduced, the mixed layer is shallow, and chemosynthesis-based nutrition (via heterotrophy and symbiosis) becomes important.OMZs represent a major oceanographic boundary for many species. As they expand and contract over geological time, OMZs may influence genetic diversity and play a key role in the evolution of species at bathyal depths. These ecosystems may preview the types of adaptations, species, and processes that will prevail with increasing hypoxia over ecological and evolutionary time. However, many questions remain unanswered concerning controls on faunal standing stocks in OMZs, and the physiological, enzymatic, metabolic, reproductive and molecular adaptations that permit benthic animals to live in OMZs. As global warming and eutrophication reduce oxygenation of the world ocean, there is a pressing need to understand the functional consequences of oxygen depletion in marine ecosystems.

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Overview of anthropogenically-induced hypoxic effects on marine benthic fauna

Cited by 25 publications

References 69 publications

Distribution patterns ofPacific halibut (Hippoglossus stenolepis) in relation to environmental variables along the continental shelf waters of theUS WestCoast and southernBritishColumbia

Distribution patterns ofPacific halibut (Hippoglossus stenolepis) in relation to environmental variables along the continental shelf waters of theUS WestCoast and southernBritishColumbia

Artificial structures in sediment-dominated estuaries and their possible influences on the ecosystem

Oxygen Minimum Zone Benthos: Adaptation and Community Response to Hypoxia

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