Response of the epibenthic macrofaunal community to a strong upwelling-driven hypoxic event in a shallow bay of the southern Humboldt Current System

Hernández‐Miranda, Eduardo; Veas, Rodrigo; Labra, Fabio A.; Salamanca, Marco; Quiñones, Renato A.

doi:10.1016/j.marenvres.2012.04.004

Cited by 33 publications

(28 citation statements)

References 60 publications

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“…2, see Hernández-Miranda et al 2010, 2012. Coliumo Bay during the sampling dates in January 2009 and January 2010 also showed the presence of Equatorial Subsurface Waters (ESSW) (i.e., temperatures near to 11-12ºC and salinities higher than 34 at the bottom of the water column), however, dissolved oxygen concentrations were greater than 2 ml l -1 in the surface stratum.…”

Section: Hydrographic Dynamicsmentioning

confidence: 87%

“…The entrance of these oxygen-deficient waters into coastal areas due to upwelling processes (Giesecke & González 2004, Pavez et al 2006, Sobarzo et al 2007) may ultimately generate hypoxic conditions (Rabalais et al 2010 and references therein). These upwelling-driven hypoxic events have been poorly documented and their chronic effects on population and community levels are unknown (but see Grantham et al 2004, Hernández-Miranda et al 2010, 2012.…”

Section: Introductionmentioning

confidence: 99%

“…In Coliumo Bay, a small shallow bay off central-south Chile, an intense hypoxic event was recorded in austral summer 2008, causing the mass mortality of fish (Hernández-Miranda et al 2010) and other epibenthic and demersal taxa (Hernández-Miranda et al 2012). The instantaneous effects on the fish assemblage were dramatic, with an abrupt drop in total density, total biomass and species richness, which was consistent with the conclusion of Vaquer-Sunyer & Duarte (2008) who, based on an extensive literature review suggested that fish are the group of organisms most affected by environmental hypoxia conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, in the short term (almost 3 months), partial recovery was observed in richness and total density (Hernández-Miranda et al 2010). Despite this, questions emerge regarding the recovery of fish assemblages in the long term (Hernández-Miranda et al 2012). In addition, how might have this hypoxia affected each particular species?…”

Section: Introductionmentioning

confidence: 99%

“…In the epibenthic macrofaunal community inhabiting the soft-bottom benthos of Coliumo Bay, the toadfish Aphos porosus (Valenciennes, 1837) (Batrachoididae) is the dominant fish species (Hernández-Miranda et al 2010) and is the fourth dominant species in relation to the total density and total biomass of the whole community (Hernández-Miranda et al 2012). The family Batrachoididae has a wide distribution in the Atlantic, Indian and Pacific Oceans (Nelson 1994), mainly inhabiting hard and soft bottoms in shallow marine coastal environments (Varas & Ojeda 1990, Merlo et al 2005, Canto-Maza & VegaCendejas 2007.…”

Section: Introductionmentioning

confidence: 99%

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The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile

Hernández‐Miranda¹,

Quiñones²,

Aedo³

et al. 2012

Rev. biol. mar. oceanogr.

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Section: Hydrographic Dynamicsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile

Hernández‐Miranda¹,

Quiñones²,

Aedo³

et al. 2012

Rev. biol. mar. oceanogr.

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On subsurface cooling associated with the Biobio River Canyon (Chile)

et al. 2016

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Submarine canyons cutting across the continental shelf can modulate the cross‐shelf circulation being effective pathways to bring water from the deep ocean onto the shelf. Here, we use 69 days of moored array observations of temperature and ocean currents collected during the spring of 2013 and winter‐spring 2014, as well as shipboard hydrographic surveys and sea‐level observations to characterize cold, oxygen poor, and nutrient‐rich upwelling events along the Biobio Submarine Canyon (BbC). The BbC is located within the Gulf of Arauco at 36° 50'S in the Central Chilean Coast. The majority of subtidal temperature at 150 m depth is explained by subtidal variability in alongshore currents on the canyon with a lag of less than a day (r2 = 0.65). Using the vertical displacement of the 10° and 10.5°C isotherms, we identified nine upwelling events, lasting between 20 h to 4.5 days, that resulted in vertical isothermal displacements ranging from 29 to 137 m. The upwelled water likely originated below 200 m. Majority of the cooling events were related with strong northward (opposite Kelvin wave propagation) flow and low pressure at the coast. Most of these low pressure events occur during relatively weak local wind forcing conditions, and were instead related with Coastal Trapped Waves (CTWs) propagating southwards from lower latitudes. These cold, high‐nutrient, low‐oxygen waters may be further upwelled and advected into the Gulf of Arauco by wind forcing. Thus, canyon upwelling may be a key driver of biological productivity and oxygen conditions in this Gulf.

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Coastal geomorphology and oceanographic features shape subtidal benthic communities in management areas of central Chile

Hernández

Tapia

Saldías

et al. 2020

Aquatic Conservation

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The spatial variation in community structure among 30 areas for the management and exploitation of benthic resources (AMEBRs) in central Chile was assessed from surveys conducted during the same spring–summer season. One hundred taxa identified in the subtidal surveys were grouped into 10 functional groups. The influence and relative importance of external factors over benthic associations were assessed through nonmetric multidimensional scaling (NMDS) and path analysis. Three main categories of external factors were considered: ‘terrain traits’ (e.g. coastline exposure), ‘surface‐ocean conditions’ (e.g. sea surface temperature, SST), and ‘fishery‐related variables’ (e.g. cumulative landings). The NMDS revealed a strong association between benthic community structure and both terrain and surface‐ocean conditions (42% of variance explained by permutational multivariate analysis of variance), but not with fishery‐related variables. Assemblages typical of rocky substrates were associated with larger seasonal fluctuations in SST and surface chlorophyll a. The presence of soft‐bottom functional groups was associated with higher levels of surface fluorescence and larger seasonal fluctuations in a satellite‐derived proxy for river‐plume influence (nLw645). A path analysis model for hard‐bottom communities reached a 49% goodness of fit (GOF), with the presence of epifaunal filter‐feeders, grazers, predators, and scavengers being significantly correlated with leathery and corticated foliose algae, which in turn depend on the fraction of rocky substrate in the AMEBR; the fraction of rocky substrate is positively correlated with coastline exposure. The model for soft‐bottom communities reached a 52% GOF with the presence of infaunal filter‐feeders and epifaunal detritivores depending directly on SST and surface chlorophyll a. The fishery‐related variables considered in the model had no apparent effect on the structure of either type of subtidal community. These results provide a hierarchy of physical–biological associations determining the functional composition of subtidal benthic communities in management areas along central Chile. This knowledge may improve future assessments of ecosystem response to changes in environmental conditions and management strategies.

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Response of the epibenthic macrofaunal community to a strong upwelling-driven hypoxic event in a shallow bay of the southern Humboldt Current System

Cited by 33 publications

References 60 publications

The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile

The impact of a strong natural hypoxic event on the toadfish Aphos porosus in Coliumo Bay, south-central Chile

On subsurface cooling associated with the Biobio River Canyon (Chile)

Coastal geomorphology and oceanographic features shape subtidal benthic communities in management areas of central Chile

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