Oxygen deficiency and benthic communities in the peruvian upper continental margin

Gutiérrez, Dimitri; Quipúzcoa, Luis; Enríquez, Edgardo

doi:10.4067/s0717-65382006000300008

Cited by 4 publications

(4 citation statements)

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“…Demersal and benthic biodiversity are higher on the Northern Peruvian shelf, where the upper limit of the OMZ is deeper (Gutiérrez et al, 2006). Farther south, the benthic communities are highly variable in the shallow subtidal zone, which is characterised by episodic oxygen deficiency (Tarazona et al, 1988;Arntz et al, 2006;Aguirre-Velarde et al, 2019).…”

Section: Ecological Effects In the Water Column And Margin Sedimentsmentioning

confidence: 99%

System controls of coastal and open ocean oxygen depletion

Pitcher

Aguirre-Velarde

Breitburg

et al. 2021

Progress in Oceanography

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The epoch of the Anthropocene, a period during which human activity has been the dominant influence on climate and the environment, has witnessed a decline in oxygen concentrations and an expansion of oxygendepleted environments in both coastal and open ocean systems since the middle of the 20th century. This paper provides a review of system-specific drivers of low oxygen in a range of case studies representing marine systems in the open ocean, on continental shelves, in enclosed seas and in the coastal environment. Identification of similar and contrasting responses within and across system types and corresponding oxygen regimes is shown to be informative both in understanding and isolating key controlling processes and provides a sound basis for predicting change under anticipated future conditions. Case studies were selected to achieve a balance in system diversity and global coverage. Each case study describes system attributes, including the present-day oxygen environment and known trends in oxygen concentrations over time. Central to each case study is the identification of the physical and biogeochemical processes that determine oxygen concentrations through the tradeoff between ventilation and respiration. Spatial distributions of oxygen and time series of oxygen data provide the opportunity to identify trends in oxygen availability and have allowed various drivers of low oxygen to be distinguished through correlative and causative relationships. Deoxygenation results from a complex interplay of hydrographic and biogeochemical processes and the superposition of these processes, some additive and others subtractive, makes attribution to any particular driver challenging. System-specific models are therefore required to achieve a quantitative understanding of these processes and of the feedbacks between processes at varying scales.

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Section: Ecological Effects In the Water Column And Margin Sedimentsmentioning

confidence: 99%

System controls of coastal and open ocean oxygen depletion

Pitcher

Aguirre-Velarde

Breitburg

et al. 2021

Progress in Oceanography

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“…; Gutiérrez et al . ). The highest organic enrichment (TOC > 4.2%) was observed in the upper bathyal and shelf zones off Antofagasta and Concepciόn on the Chilean margin, coinciding with falling bottom‐water DO levels (Sellanes et al .…”

Section: Discussionmentioning

confidence: 97%

Macrobenthos relative to the oxygen minimum zone on the East Indian margin, Bay of Bengal

et al. 2014

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The Bay of Bengal remains one of the least studied of the world's oxygen minimum zones (OMZs). Here we offer a detailed investigation of the macrobenthos relative to oxygen minimum zone [OMZ – DO (dissolved oxygen), concentration <0.5 ml·1−1] at 110 stations off the North East Indian margin (160 and 200 N) featuring coastal, shelf and slope settings (10–1004 m). Macrobenthos (>0.5 mm) composition, abundance and diversity were studied in relation to variations in depth, dissolved oxygen, sediment texture and organic carbon. Using multivariate procedures powered by SIMPROF analysis we identified distinct OMZ core sites (depth 150–280 m; DO 0.37 ml·1−1) that exhibited dense populations of surface‐feeding polychaetes (mean 2188 ind. m−2) represented by spionids and cossurids (96%). Molluscs and crustaceans were poorly represented except for ampeliscid amphipods. The lower OMZ sites (DO > 0.55 ml·l−1) supported a different assemblage of polychaetes (cirratulids, amphinomids, eunicids, orbinids, paraonids), crustaceans and molluscs, albeit with low population densities (mean 343 ind. m−2). Species richness [E(S100)], diversity (Margalef d; H’) and evenness (J’) were lower and dominance was higher within the OMZ core region. Multiple regression analysis showed that a combination of sand, clay, organic carbon, and dissolved oxygen explained 62–78% of the observed variance in macrobenthos species richness and diversity: E(S100) and H’. For polychaetes, clay and oxygen proved important. At low oxygen sites (DO <1 ml·l−1), depth accounted for most variance. Residual analysis (after removing depth effects) revealed that dissolved oxygen and sediment organic matter influenced 50–62% of residual variation in E(S100), H’ and d for total macrofauna. Of this, oxygen alone influenced up to ~50–62%. When only polychaetes were evaluated, oxygen and organic matter explained up to 58–63%. For low oxygen sites, organic matter alone had the explanatory power when dominance among polychaetes was considered. Overall, macrobenthic patterns in the Bay of Bengal were consistent with those reported for other upwelling margins. However, the compression of faunal gradients at shallower depths was most similar to the Chile/Peru margin, and different from the Arabian Sea, where the depth range of the OMZ is two times greater. The Bay of Bengal patterns may take on added significance as OMZs shoal globally.

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“…However, the HCS is also subject to climate variability at different time scales [13]. In particular, during El Niño Southern Oscillation (ENSO) events, large-scale changes are generated in the atmospheric and oceanic circulation, which lead to an increase in surface temperatures and a deeper oxycline, nutricline, and thermocline [17,18]. As a consequence, the decrease in the contribution of nutrients to the euphotic zone generates a reduction in primary production [16] that can affect the bioenergetic condition of individuals and their fundamental physiological processes, such as growth and reproduction [19].…”

Section: Humboldt Current Systemmentioning

confidence: 99%

The Red Squat Lobster Pleuroncodes monodon in the Humboldt Current System: From Their Ecology to Commercial Attributes as Marine Bioresource

Yapur-Pancorvo,

Quispe-Machaca,

Guzmán-Rivás

et al. 2023

Animals

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This study focused on gathering available information on Pleuroncodes monodon, a widely distributed crustacean in the Humboldt Current System. Off the Chilean coast, this species presents benthic habits and constitutes the main resource of the industrial crustacean fishery; many studies have been carried out on its life cycle during the last century. In contrast, off the coast of Peru, this species exhibits mainly pelagic habits, with latent information gaps on aspects of its life history and no commercial fishery activities, such as catching, taking or harvesting from the marine environment. P. monodon is an ecologically important species, as a source of energy for its predators, which include invertebrates, birds, marine mammals and fish of commercial interest. Thus, P. monodon seems to play a key role in this ecosystem, mainly as an intermediate link between top predators and the first links in the food chain. In addition, this species presents various adaptation strategies to the changing oceanographic parameters of the areas it inhabits, even tolerating hypoxic environments and great depths in order to avoid being predated. Likewise, from an economic viewpoint, it has a high commercial value as a marine bioresource with great potential in the pharmaceutical and food industries. Considering this, more studies must be carried out to corroborate the biological, ecological, and fishing importance of this species in order to generate efficient management measures and ensure a sustainable fishery.

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Oxygen deficiency and benthic communities in the peruvian upper continental margin

Cited by 4 publications

References 0 publications

System controls of coastal and open ocean oxygen depletion

System controls of coastal and open ocean oxygen depletion

Macrobenthos relative to the oxygen minimum zone on the East Indian margin, Bay of Bengal

The Red Squat Lobster Pleuroncodes monodon in the Humboldt Current System: From Their Ecology to Commercial Attributes as Marine Bioresource

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