Large-scale spatial patterns of benthic assemblages in the SW Atlantic: the Rı́o de la Plata estuary and adjacent shelf waters

Giberto, Diego; Bremec, Claudia; Acha, E.M.; Mianzán, Hermes

doi:10.1016/j.ecss.2004.03.015

Cited by 117 publications

(76 citation statements)

References 24 publications

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“…Mollusc diversity followed the salinity gradient, with the highest diversity in the downstream stations which were mostly influenced by marine intrusion, and decreasing towards upstream. Community composition gradually changes according to the salinity gradient of the lagoon, a trend similar to those reported in Gaston et al (1998) and Giberto et al (2004). Species (M. edulis, M. perna and C. gazar) known to be intolerant of wide fluctuations in salinity were restricted to station seven where a higher and relatively stable salinity was recorded, this observation has also been reported in other estuarine systems (Oyenekan, 1988).…”

Section: Discussionsupporting

confidence: 59%

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Spatial Patterns in Diversity and Distribution of Benthic Molluscs in a Weak Tidal Tropical Lagoon

Uwadiae¹

2013

ijms

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Spatial patterns in diversity and distribution of benthic molluscs in a weak tidal tropical lagoon in south-west Nigeria were investigated from samples collected in eight study stations distributed along the stretch of the lagoon for two consecutive years. The study also investigated selected environmental conditions of overlying water and sediment of the lagoon to establish the roles played by environmental variables. There was a significant variation (p < 0.05) in salinity values along the study stretch which was predicated on the existing gradient in salinity of the lagoon. Higher values of mud and Total organic content (TOC) of sediment occurred in upstream compared to values observed in downstream stations. Mollusc communities were significantly influenced by the spatial gradient in salinity and variability in sediment parameters. The downstream stations had brackish conditions, while the upstream stations were typically freshwater, leading to differences in the composition and abundance of molluscs. The downstream stations recorded higher density and diversity of mollusc compared to upstream stations. Our results suggest that benthic molluscs in Epe Lagoon show spatial patterns related to differences in environmental parameters.

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Section: Discussionsupporting

confidence: 59%

“…Spatio-temporal variability in benthic macrofauna has been studied in coastal aquatic systems throughout the world (Morrisey et al, 1992;Ieno and Bastida, 1998;Biles et al, 2003;Giberto et al, 2004). This variability is dependent on physical and chemical factors and biological interactions.…”

Section: Introductionmentioning

confidence: 99%

Spatial Patterns in Diversity and Distribution of Benthic Molluscs in a Weak Tidal Tropical Lagoon

Uwadiae¹

2013

ijms

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“…As a result of these diverse inputs, trophic as well as species diversity may vary along estuarine gradients. Inner estuaries may be dominated by deposit feeders or suspension feeders that thrive on the abundant particulates from riverine sources (e.g., Giberto et al 2004;Currie and Small 2005); in such cases, biomass may be highest in inner estuaries, showing the opposite pattern from biodiversity. Thus quantifying biomass patterns should provide clues about the causes of biodiversity patterns.…”

Section: Introductionmentioning

confidence: 99%

“…In estuaries, physical gradients often covary with anthropogenic stressors such as pollutants, acting synergistically or antagonistically to impact biodiversity and, subsequently, ecosystem function (Raffaelli, 2006;Rakocinski et al, 2000). The key physical gradients that frequently correlate with estuarine biota are salinity (Giberto et al, 2004;Hirst, 2004;Rutger and Wing, 2006), sediment grain size and deposition rate (Anderson et al, 2004;Hernandez-Arana et al, 2003;Hewitt et al, 2005;Wieser, 1959) and oxygen content (e.g., Bishop et al 2006). The physiological and ecological effects of particular physical factors, and in some cases their interactions, are known for some estuarine species; salinity has been particularly well studied (reviewed by Wolff 1983, Attrill 2002.…”

Section: Introductionmentioning

confidence: 99%

Restricted ranges in physical factors may constitute subtle stressors for estuarine biota

Dethier

Ruesink

Berry

et al. 2010

Marine Environmental Research

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Biotic trends along estuarine gradients can be affected by co-varying processes ranging from large-scale oceanographic to local-scale physico-chemical effects. As a baseline for future process studies, we investigated the distinct gradients in species richness and biomass in pebblesand shorelines along the estuarine axis of Puget Sound, and the scales of variation of some of their physical correlates. Higher richness and biomass at beaches at the more marine end of the Sound are temporally consistent and seen in all trophic groups. Variables that correlate with biotic patterns include relatively subtle increases in beach surface and sediment temperatures and decreases in nearshore salinity near the head of the estuary, but not more localized parameters such as sediment grain size or porewater salinity. To understand whether these variables are true forcing functions of community structure, we are performing experimental work.

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“…This pattern is identical to the one in A. cyclophora. These spatial dietary changes could be attributed to differences in the structure and abundance of the benthic community between north and south region, caused by distinct environmental conditions: in the north area, the Río de la Plata estuary, bottom type, salinity and the presence of a turbidity front structures the benthic communities (Giberto et al, 2004); in the south area, vertical homogeneity due to tidal forcing and a salinity coastal front are the main environment factors .…”

Section: Discussionmentioning

confidence: 99%

Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Barbini

Lucifora

2016

Neotrop. ichthyol.

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The eyespot skate, Atlantoraja cyclophora, is an endemic species from the southwestern Atlantic, occurring from Rio de Janeiro, Brazil, to northern Patagonia, Argentina. The feeding habits of this species, from off Uruguay and north Argentina, were evaluated using a multiple hypothesis modelling approach. In general, the diet was composed mainly of decapod crustaceans, followed by teleost fishes. Molluscs, mysidaceans, amphipods, isopods, lancelets and elasmobranchs were consumed in lower proportion. The consumption of shrimps drecreased with increasing body size of A. cyclophora. On the other hand, the consumption of teleosts increased with body size. Mature individuals preyed more heavily on crabs than immature individuals. Teleosts were consumed more in the south region (34º -38ºS) and crabs in the north region (38º -41ºS). Shrimps were eaten more in the warm season than in the cold season. Prey size increased with increasing body size of A. cyclophora, but large individuals also consumed small teleosts and crabs. Atlantoraja cyclophora has demersal-benthic feeding habits, shifts its diet with increasing body size and in response to seasonal and regional changes in prey availability and distribution.La raya de círculos, Atlantoraja cyclophora, es una especie endémica del Atlántico Sudoccidental, que se distribuye desde Río de Janeiro, Brasil, hasta el norte de la Patagonia, Argentina. Los hábitos alimentarios de esta especie fueron evaluados frente a la costa de Uruguay y norte de Argentina, utilizando un enfoque de modelado de múltiples hipótesis. En general, la dieta estuvo compuesta principalmente por crustáceos decápodos (71,37 %IRI), seguido de peces teleósteos (28,54 %IRI). En menor proporción fueron consumidos moluscos, misidáceos, anfípodos, isópodos, anfioxos y elasmobranquios. El consumo de decápodos Natantia disminuyó con el incremento del tamaño del cuerpo de A. cyclophora. Por otro lado, el consumo de teleósteos se incrementó con el incremento del tamaño del cuerpo. Individuos maduros consumieron cangrejos en mayor proporción que individuos inmaduros. Los teleósteos fueron consumidos mayormente en la región sur (34º -38ºS) y los cangrejos en la región norte (38º -41ºS). Los decápodos Natantia fueron más consumidos en la estación cálida que en la estación fría. El tamaño de las presas consumidas se incrementó con el aumento del tamaño corporal de A. cyclophora, pero individuos de mayor tamaño no abandonadon el consumo de pequeños cangrejos y teleósteos. Atlantoraja cyclophora presenta hábitos alimentarios demersal-bentónicos, cambia su dieta con el incremento del tamaño corporal y en respuesta a cambios estacionales y regionales en la disponibilidad y distribución de las presas.

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Large-scale spatial patterns of benthic assemblages in the SW Atlantic: the Rı́o de la Plata estuary and adjacent shelf waters

Cited by 117 publications

References 24 publications

Spatial Patterns in Diversity and Distribution of Benthic Molluscs in a Weak Tidal Tropical Lagoon

Spatial Patterns in Diversity and Distribution of Benthic Molluscs in a Weak Tidal Tropical Lagoon

Restricted ranges in physical factors may constitute subtle stressors for estuarine biota

Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

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