Biodiversity of epibenthic community in the inshore waters of southeast coast of India

Khan, Ajmal; Manokaran, Seerangan; Lyla, Somasundaran; Nazeer, Zahid

doi:10.2478/s11756-010-0073-z

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…A few studies focused on the economically important bivalve species and associated conservation efforts (Rao, 1974; Kripa & Appukuttan, 2003). Various other studies reported overall diversity of organisms including bivalves from localities in the southern coast (Kurian, 1971; Khan et al , 2010; Kundu et al , 2010; Manokaran et al , 2015), east coast (Ansari et al , 1977; Mahapatro et al , 2011), and west coast (Parulekar, 1973; Parulekar & Dwivedi, 1974; Parulekar & Wagh, 1975; Jayaraj et al , 2007). Such studies conducted at a local scale, although common, may be limited in their utility in explaining larger patterns.…”

Section: Discussionmentioning

confidence: 98%

Influence of regional environment in guiding the spatial distribution of marine bivalves along the Indian coast

2017

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Tropical coastal areas are amongst the most diverse ecosystems in the world. However, there are quite a few coasts that have rarely been studied for their macro-benthic diversity. The Indian coastline presents one such gap area. Two sub-parallel coastlines of India have a wide latitudinal span (8–23°N) and strikingly different physiographic environments. While the east coast receives a high siliciclastic input from large river systems flowing to the Bay of Bengal with fluctuating salinity, the west coast has a large shelf area and high productivity of the Arabian Sea. Such difference enables us to evaluate the effect of regional environmental parameters on marine molluscan diversity and distribution in an intra-tropical setting. Because of the wide latitudinal range, it is also possible to assess if spatial difference in species richness in such a regional scale follows the large-scale biodiversity pattern such as Latitudinal Biodiversity Gradient (LBG) despite inherent environmental variation. We used species distribution of marine bivalves, compiled using bioSearch and the Ocean Productivity database, to address this question. Our results show that intra-tropical species richness of marine bivalves is guided primarily by regional environmental parameters. Even with identical latitudinal extent, higher nutrient availability and larger shelf area, the west coast has significantly lower richness than the east coast; among environmental variables, productivity, salinity and coastline length emerged as significant predictors of species diversity. Moreover, a positive influence of a South Asian biodiversity hotspot on east coast fauna and a negative impact of the oxygen-depleted condition of Arabian Sea on west coast fauna, may have a significant contribution in developing such coastal variation in species richness. The latitudinal variation in species richness did not follow LBG. In contrast to the coast-specific diversity difference, species composition is not found to be dictated by coastal affiliation. The composition corresponds primarily to physiographic conditions. We identified three distinct eco-regions (north-western, southern, north-eastern) with characteristic species composition corresponding to unique physiography and productivity mechanism. The NW region has low siliciclastic input and high productivity associated with upwelling during winter cooling. The NE region has a distinctly high riverine input and salinity fluctuation. The southern region, in contrast, has well developed reefal system with moderate variation in salinity. Such correspondence underscores the importance of the regional environment in dictating the species diversity and distribution in the shallow marine realm.

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Section: Discussionmentioning

confidence: 98%

Influence of regional environment in guiding the spatial distribution of marine bivalves along the Indian coast

2017

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“…Industrial development along the Parangipettai coasts has rapidly expanded in recent years and substantial growth is planned for the near future (Kanakaraj et al 2003;Ajmal Khan et al 2010). Therefore, the present investigation was undertaken to describe meiobenthic communities with a special emphasis on free-living marine nematode diversity and community structuring from the continental shelf off Parangipettai (Bay of Bengal), which will serve as a baseline of information for assessing benthic diversity trends across South Asian continental shelfs.…”

Section: Introductionmentioning

confidence: 99%

Diversity patterns of free‐living marine nematodes in the southwest continental shelf off Bay of Bengal and their link to abiotic variables

et al. 2015

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Marine sediments in continental shelf ecosystems harbor a rich biodiversity of benthic communities. In this study, the spatial and temporal diversity and community assemblages of free-living marine nematodes were studied by sampling at six depths and over 3 years from the southwest continental shelf off Bay of Bengal, one of the least explored tropical shelf ecosystems. The dominant marine nematode species were related with abiotic variables as part of this study. The effects of sediment granulometry generally decreased with increasing depth and the highest nematode density and species diversity were recorded on coarse sand (shallower depths). Multivariate analysis of the nematode community data showed that community structure differed significantly among depths as well as among years. Statistical analyses showed significant correlations between the nematode community and abiotic variables. Sediment texture, organic matter, water pressure and depth profile were crucial factors for determining diversity, vertical profile and feeding types of the nematode community. Other environmental factors, including anthropogenic pressure, did not have an effect on nematode diversity except for the presence of some tolerant species (Metachromadora spp., Sabatieria spp. and Siplophorella sp.). This study represents a baseline of knowledge of free-living marine nematode communities that can be used in the future to compare nematode assemblages from temperate shelf ecosystems.

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“…This may be the reason for the low abundance of amphipods here. Previous study done (AjmalKhan et al, 2010) in Cuddalore-Parangipettai area on the epifauna showed low number of species in the SIPCOT region which was indicative of the stress here. Due to stress, Simpson dominance index was found high and other diversity indices (Shannon, Margalef etc.)…”

mentioning

confidence: 51%

Diversity of amphipods in the continental shelf sediments of southeast coast of India

Raja¹,

Lyla²,

Khan³

2013

J. Mar. Biol. Ass. India

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The diversity of amphipods in the continental shelf sediments of the southeast coast of India is dealt in the paper. Samples for the study were collected onboard FORV Sagar Sampada during Cruise Nos. 260, 275 and 290 conducted in respectively. Samples were collected at various depths (30 m, 50 m, 75 m, 100 m, 150 m and 200 m) along 6 transects namely Singarayakonda, Tammenapatanam, Chennai, Cheyyur, Cudallore-Parangipettai and Karaikkal besides Cuddalore-SIPCOT using Smith-McIntyre grab having a bite area of 0.2 m 2 . The total number of species of amphipods recorded was 44 belonging to 29 genera and 17 families. The number of species and abundance decreased from the shallower depths to the deeper depths. The abundance varied from 1 to 467 nos./0.2 m 2 . The maximum was found in Cheyyur transect at 30 m depth and the minimum in Cheyyur at 150 m and in Cuddalore-SIPCOT at 200 m depth. The number of species at various depths ranged from 1 to 17. While the maximum number of species was found in Cheyyur at 30 m depth, the minimum was found in Cheyyur at 150 m, Cuddalore-SIPCOT at 200 m and Cuddalore-Parangipettai at 150 m depths. Ampelisca spp. was found to be dominant in the study area. Species estimators, especially Chao1 showed the chances of recording as many as 142 species of amphipods in the study area with intensive sampling. In view of this fact, further sampling in the study area will throw more light on the amphipod diversity.

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Biodiversity of epibenthic community in the inshore waters of southeast coast of India

Cited by 12 publications

References 12 publications

Influence of regional environment in guiding the spatial distribution of marine bivalves along the Indian coast

Influence of regional environment in guiding the spatial distribution of marine bivalves along the Indian coast

Diversity patterns of free‐living marine nematodes in the southwest continental shelf off Bay of Bengal and their link to abiotic variables

Diversity of amphipods in the continental shelf sediments of southeast coast of India

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