Benthic foraminifera assemblages in turtle congregation sites along the north-east coast of India

Abstract

Near-shore recent benthic foraminifera from three ecologically important (Olive Ridley turtle congregation sites) but vulnerable sites encompassing 23 sampling stations (12 in Rushikulya, 5 in Devi and 6 in Gahirmatha) along coastal Orissa, north-west Bay of Bengal (BoB) in India were studied for the first time for their composition, distribution and assemblage patterns. Thirty-nine species of benthic foraminifers (from 6 orders and 23 families) were identified of which all 39 were present in Rushikulya, 22 in Devi and 12 in Gahirmatha with abundance ranging from 35–2620 individuals/10 cm3 in the sediments. The communities across the sites were dominated by eurytopic rotalids followed by miliolids and textularids. Benthic foraminifer assemblages were found to be dominated by Ammonia species complex (up to 38% in Rushikulya, 64% in Devi and 22% in Gahirmatha). Agglutinated foraminifers were infrequent in the sediments (7 species in Rushikulya, 4 species in Devi and 3 in Gahirmatha) on the other hand, being dominated by Quinqueloculina agglutinans in Rushikulya and Trochammina macrescens and Ammobaculites agglutinans in Devi and Gahirmatha. The substrates along the study sites were found mostly to be sand dominated and in some of the stations sediment composition influenced the foraminifer distribution pattern. The present findings on the assemblage patterns of benthic foraminifers from three coastal settings in Orissa along the BoB are comparable with previous reports from other sandy coastal ecosystems in the world. Overall these data provide valuable insights into the distribution and assemblage patterns of benthic foraminifers from the BoB coastal regions.

Suctorian epibionts on Chromaspirina sp. (Nematoda: Desmodoridae) from the shallow continental shelf of the Bay of Bengal, northern Indian Ocean

“…These findings on the abundance and assemblage patterns of meiofauna are in agreement with previous studies in the area of Rushikulya (e.g. Bhattacharjee et al, 2013).…”

“…Bhattacharjee et al, 2013), free living nematodes were collected and examined. Interestingly, two suctorian ciliates were observed as epibionts on the cuticles of one free living marine nematode, Chromaspirina sp.…”

A Review on Research Studies of Marine and Brackish Water Meiofauna From Odisha, India

“…This is perhaps surprising since lagoon assemblages must be viable over a greater range of environmental conditions than those found subtidally in brackish water habitats, and suggests that despite their isolated nature, dispersal opportunities remain sufficient to maintain the input of estuarine/marine species. Bhattacherjee et al (2013) reported benthic foraminiferal assemblages along coastal Orissa. Thirty-nine species (belonging to 6 order and 23 families) of Foraminifera were collected from three coastal areas viz.…”

Foraminiferal biofacies distribution in the outer channel of Chilika Lagoon, Odisha, India

“…As they have a short life span (from a few days up to one year, Murray, 1991;Nigam et al, 2003;Kurtarkar et al, 2019), they respond to small changes in the environment. Due to these characteristics, foraminifera is extensively used as a tool for monitoring the coastal environment along with different marginal environments like estuarine (Alve, 1995;Bhattacharjee et al, 2013;Luan & Debenay, 2005), marsh (Gehrels & Newman, 2004;Horton & Murray, 2007) and lagoonal environment (Martins et al, 2013;Samir, 2000).…”