Infaunal Macrobenthic Community of Soft Bottom Sediment in a Tropical Shelf

Jayaraj, K. A.; Jacob, J.; Kumar, Pankaj

doi:10.2112/06-0790.1

Cited by 44 publications

(26 citation statements)

References 26 publications

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“…However, all of them suggest that the amount of hydrodynamic energy and available organic matter are the main driving forces in structuring the soft-bottom communities, with depth and sediment grain size as secondary correlates. Depth and grain size are intrinsically related factors that act on the variability of the macrofauna diversity, integrating effects of the hydrodynamic environment over time (ELLINGSEN, 2002;JAYARAJ et al, 2008;MOHAMMED;COPPARD, 2008). The results obtained in the present study support these findings, since it was possible to observe 3 spatially distinct groups of amphipods that corresponded to different hydrodynamic areas.…”

Section: Discussionsupporting

confidence: 85%

Spatio-temporal and functional structure of the amphipod communities off Santos, Southwestern Atlantic

Rodrigues

Pires-Vanin

2012

Braz. j. oceanogr.

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A B S T R A C TThe amphipod fauna was employed to investigate a bottom environmental gradient in the continental shelf adjacent to Santos Bay. The constant flow of less saline water from the estuarine complex of the Santos and São Vicente rivers besides the seasonal intrusion of the cold saline South Atlantic Central Water (SACW) bring a highly dynamic water regime to the area. Density, distribution, diversity and functional structure of the communities were studied on a depth gradient from 10 to 100 m on two cruises in contrasting seasons, winter 2005 and summer 2006. Twenty-one sediment samples were taken with a 0.09m 2 box corer. Temperature and salinity were measured at each station and an additional surface sediment sample was obtained with the box corer for granulometric and chemical analyses. Sixty species were collected on each survey and higher density values were found in summer. A priori one-way Analysis of Similarities (ANOSIM) indicated the existence of three different groups of amphipods related to the depth gradient: the Coastal group, the Mixed Zone group and the Deep Zone group. The Coastal Zone in both cruises was inhabited by a community presenting low diversity and density, besides high dominance of the infaunal tube-dweller Ampelisca paria; the area around 30 m presented the highest values of all the ecological indicators and the species showed several life styles; the outer area, situated between 50 and 100 m depth in the SACW domain, presented a community characterized by lower diversity and high biomass and density values. A season-depth ANOSIM showed the influence of depth and season for the Coastal and Mixed Zone groups whereas no seasonal difference was obtained for the Deep Zone group. The synergistic effect of the SACW and depth in the first place, followed by physical changes in substrate, seem to be the main factors controlling the fauna's distribution. In addition, the estuarine waters from Santos Bay apparently had no effect on the establishment of the environmental gradient observed on the adjacent shelf. Diversity, distribution, functional groups and trophic conditions of superficial sediments are discussed in the light of the main oceanographic processes present on the southern Brazilian shelf. R E S U M OA fauna de anfípodes foi empregada para investigar o gradiente ambiental na plataforma continental adjacente a Baía de Santos. A entrada constante de uma água menos salina proveniente do complexo estuarino de Santos e São Vicente e a intrusão sazonal da água fria e salina da Água Central do Atlântico Sul (ACAS) faz com que a área seja um ambiente hidrodinamicamente instável. Densidade, distribuição, diversidade e estrutura funcional das comunidades de anfípodes foram estudadas em um gradiente de profundidade entre 10 e 100 m, em dois cruzeiros realizados em épocas contrastantes, inverno (2005) e verão (2006). Vinte e uma amostras de sedimento foram coletadas com um box corer de 0,09 m 2 . Temperatura e salinidade foram coletadas em cada estação com CTD e uma amostra adicional...

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Section: Discussionsupporting

confidence: 85%

Spatio-temporal and functional structure of the amphipod communities off Santos, Southwestern Atlantic

Rodrigues

Pires-Vanin

2012

Braz. j. oceanogr.

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“…While member of Eunicidae (D. neapolitana) occurred in Mormugao and Trivandrum along the west coast and they were also found widely distributed along northern east coast (from Nellore to Kakinada). Jayaraj et al (2008) also made a similar report on the high occurrence of Prionospio sp. from the southwest coast.…”

Section: Discussionmentioning

confidence: 60%

“…Such observations were also reported from the west coast of India by Ingole et al (2002) and Parulekar and Wagh (1975). A transition in the community structure was reported by Jayaraj et al (2008) with a change in the sediment texture and depth. Other macrobenthic faunas especially crustaceans found dominant over the other macrobenthic groups along the east coast at Machilipatnam and Kakinada.…”

Section: Discussionmentioning

confidence: 89%

Distribution and abundance of macrobenthic polychaetes along the South Indian coast

Musale

Desai

2010

Environ Monit Assess

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Macrobenthic polychaetes play a significant role in marine benthic food chain. A study was carried out to observe the abundance and diversity of soft bottom macrobenthic polychaetes along the South Indian coast, along with observations on sediment characteristics. The present study indicated an increase in the polychaete diversity as compared to earlier reports. Sixty-three different forms of polychaetes were identified along the coast, which constitute the bulk of the macrobenthic fauna. Thirty-eight species of polychaetes showed higher abundance along the west coast, whereas 25 species showed higher abundance along the east coast. Seabed composition showed a spatial variation in its composition along the coast. Occurrence of Prionospio pinnata and Capitella capitata the deposit feeders and indicators of organic pollution suggesting the sampled area is organically rich. Polychaete abundance was found to be higher along the west coast and was attributed to loose texture of sediment due to high sand and sandy-silt resulting in higher interstitial space for organisms to harbor. Canonical correspondence analysis indicated that majority of polychaete species preferred low organic carbon, sandy silt, or sandy-clay substratum. The lower polychaete abundance at high organic carbon and high silt and clay areas can be attributed to avoidance of organisms to rich organic matter and suboxic levels, being a possible indication that these characteristics adversely affects the polychaete abundance and distribution.

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“…Some studies, however, suggested that diversity of macrobenthos does not necessarily increase with habitat heterogeneity, because different species respond differently to this change (Skilleter and Warren, 2000;Zipperer, 1996). Furthermore, each structural component in mangrove ecosystems can modify the physicochemical properties of sediment, such as total organic matter (TOM) and particle size, potentially reshaping the distribution pattern of macrobenthos (Jayaraj, Josia, and Dinesh Kumar, 2008;Pearson and Rosenberg, 1978;Schrijvers, Van Gansbeke, and Vincx, 1995).…”

Section: Introductionmentioning

confidence: 99%

Habitat Heterogeneity Determining the Macrobenthic Infaunal Community in a Mangrove Swamp in South China: Implication for Plantation and Plant Invasion

Leung

2015

Journal of Coastal Research

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Infaunal Macrobenthic Community of Soft Bottom Sediment in a Tropical Shelf

Cited by 44 publications

References 26 publications

Spatio-temporal and functional structure of the amphipod communities off Santos, Southwestern Atlantic

Spatio-temporal and functional structure of the amphipod communities off Santos, Southwestern Atlantic

Distribution and abundance of macrobenthic polychaetes along the South Indian coast

Habitat Heterogeneity Determining the Macrobenthic Infaunal Community in a Mangrove Swamp in South China: Implication for Plantation and Plant Invasion

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