Influence of environmental properties on macrobenthos in the northwest Indian shelf

Jayaraj, K. A.; Jayalakshmi, K. J.; Saraladevi, K.

doi:10.1007/s10661-006-9295-5

Cited by 87 publications

(55 citation statements)

References 25 publications

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“…The C : N ratios and δ 13 C values suggest that the organic carbon is of marine origin (Agnihotri et al, 2008). At a 30 m deep location (off Goa) on the inner shelf, Jayaraj et al (2007) observed benthic fauna such as polychaetes, crustaceans, mollusks and others, of which polychaetes comprised 83 %. At a 43 m deep site (off Bhatkal) on the inner shelf, Ingole et al (2010) also reported 43 taxa of benthic fauna such as polychaetes, crustaceans, oligochaetes, of which polychaetes comprised 85-95 %.…”

Section: Study Sitementioning

confidence: 93%

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

et al. 2014

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Abstract. The western Indian continental shelf is one of the most productive coastal systems of the world ocean. This system experiences extreme changes in its oxygen regime, being normoxic from November to May and suboxic (denitrifying)/anoxic from June to October, owing to the biogeochemical response to cyclical monsoonal influence. In order to understand the impact of the seasonally varying oxygen regime on benthic mineralization, nutrient exchange and, in turn, on the shelf ecosystem, we carried out the first ever intact-core incubations during two contrasting seasons -spring intermonsoon and fall intermonsoon (late southwest monsoon) at a 28 m-deep fixed site on the inner shelf off Goa, dominated by fine-grained cohesive sediments. The results showed that incomplete sediment oxygen consumption (SOC) occurred during April as opposed to the complete SOC and subsequent sulfide flux observed in the fall intermonsoon incubations. The sediments acted as a perennial net source of DIN (dissolved inorganic nitrogen i.e. NO Slow oxidation of organic carbon (C org ) under anoxia, lower temperature and reduced benthic faunal activity appeared to decrease benthic mineralization by 25 % as suggested by the drop in the C org oxidation rate from 63.8 mmol C m −2 d −1 in April to 47.8 mmol C m −2 d −1 in October. This indicated a higher preservation of C org during the late southwest monsoon. Sediment porosity, C org content and nutrients did not show significant variations from April to October. Porewaters were found to be enriched with NH

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Section: Study Sitementioning

confidence: 93%

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

et al. 2014

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“…Cluster 2 was differentiated into fine sediment texture with a high OM content; however, a low amount of DO and high sulphide with high OM content was observed at these stations. In this case, low species abundance and diversity was observed at stations 3 and 4, where high OM and sulphide adversely affect benthic fauna (Jayaraj et al 2007). This could also be evidenced from the An MDS plot based on the average abundance of molluscan fauna and environmental parameters revealed four distinct groups with a 32% similarity in the study area (Fig.…”

Section: Multivariate Analysesmentioning

confidence: 87%

Influence of environmental parameters on the distribution and diversity of molluscan composition in pondicherry mangroves, southeast coast of India

Satheeshkumar

Khan

2012

Ocean Sci. J.

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− Seasonal variation in the distribution of mollusks in relation to environmental parameters was studied at four mangrove stations on the Pondicherry coast during September 2008-August 2009. A total of 37 species of molluscs were recorded, among them 16 species of bivalves belonging to 7 families and 12 Genera, and 21 species of gastropods belonging to 14 families and 19 Genera, with the Cereithedia cingulata being the dominant group. An increase of species density and diversity in the Post monsoon season was observed, with the highest values for both indexes at stations 1 and 2, and the lowest at stations 3 and 4 fine where the sand assemblage was dominated by a few gastropods. Pollution indicator species Cassidula nucleus, Melampus ceylonicus, Sphaerassiminea minuta were found only in highly polluted regions near stations 3 and 4; they were totally absent in moderately polluted areas near stations 1 and 2. From a stepwise multivariate analysis of the different environmental parameters regarding molluscan density, it was found that in all 10 parameters govern the density variation of benthic mollusks in Pondicherry mangroves and that the organic matter of sediment and sulphide, DO, and salinity were the highly significant ones.

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“…Thus the low species richness of polycheates may be due to one or a combination of the above factors or the high level of pollution and eutrophication at these two sites. It could also be related to sediment properties and other environmental conditions prevailing in the area (Jayaraj et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

The spatial variation of macrobenthic community in the Negombo estuary in relation to physico-chemical parameters

Chandrasekera¹,

Hettiarachchi

2014

Sri Lanka J. Aquat.

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Analysis of physico-chemical parameters gives an insight to the the spatial distribution of benthic communities in estuaries. With this view the present study was carried out to see whether the spatial distribution of macrobenthic fauna is governed by the physico-chemical parameters in sediment and overlying water in Negombo estuary, Sri Lanka. This study also attempted to determine the key physico-chemical determinants that govern this spatial distribution.During the study, the macrobenthic fauna at Moya, Virisiyanu Duwa, Kadol Kele, Dungalpitya, and Pamunugama within the estuary were collected and their species diversity and species richness were determined. Physicochemical parameters such as the pore water salinity, temperature, pH, sand %, silt %, clay % and OM % in sediment as well as the salinity, pH, temperature, conductivity, DO, BOD5 and NO3 -concentration in the over lying water were measured and analyzed using appropriate standard techniques.Results revealed that the species richness, species diversity, structure of the macrobenthic community and the physico-chemical parameters in sediment and the over lying water and the varied significantly between the five study sites. However, the species diversity and the species richness were positively correlated with the salinity and sand % while they were negatively correlated with the BOD5, silt % and OM % in the sediment and overlying water. It is therefore evident that the spatial distribution of macrobenthic fauna in Negombo estuary is governed by a combination of some key physico-chemical parameters such as salinity, sand %, OM % and BOD5 in the sediment and over lying water in this tropical estuary.

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Influence of environmental properties on macrobenthos in the northwest Indian shelf

Cited by 87 publications

References 25 publications

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

Influence of environmental parameters on the distribution and diversity of molluscan composition in pondicherry mangroves, southeast coast of India

The spatial variation of macrobenthic community in the Negombo estuary in relation to physico-chemical parameters

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