Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India; National Center for Polar and Ocean Research, Goa, India.
Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India.
Mar Pollut Bull. 2022 Feb;175:113158. doi: 10.1016/j.marpolbul.2021.113158. Epub 2021 Nov 25.
The ecological preferences of living benthic foraminifera from the riverine influx dominated eastern continental margin of India have been studied. The living benthic foraminifera were abundant on the upper slope (~100-700 m). Three distinct species assemblages were identified. Assemblage 1 (Ammonia beccari, Pseudononion costiferum, Hanzawaia nipponica, Bolivina frondalis, Bolivina dilatata, Bolivina striatula, Asterorotalia milletti) representing warmer, well-oxygenated water and coarse substrate with low organic carbon is restricted to the inner shelf. Assemblage 2 includes species (Verneuilinulla propinqua, Ammodiscus incertus, Buliminella dubia, Rotaliatinopsis semiinvoluta, Bolivina lowmani, Fursenkoina spinosa) thriving in the regions with abundant food availability and low oxygen concentration on the continental slope. The species in Assemblage 3 (Globocassidulina subglobosa, Epistominella exigua, Gyroidinoides subzelandica, Reophax longicollis, Adercotryma glomeratum, Cystammina pauciloculata, Spiroplectammina biformis) prefer deeper waters with moderate organic carbon and dissolved oxygen. The information of the ecological niches of benthic foraminifera will help in environmental impact assessment and paleoecological studies.
本研究调查了印度东部大陆架边缘受河流注入影响地区的底栖有孔虫的生态偏好。有孔虫在上坡（约 100-700 米）处大量存在。确定了三个不同的物种组合。组合 1（Ammonia beccari、Pseudononion costiferum、Hanzawaia nipponica、Bolivina frondalis、Bolivina dilatata、Bolivina striatula、Asterorotalia milletti）代表了温暖、含氧充足、基质粗糙、有机碳含量低的水和环境，仅局限于内陆架。组合 2 包括在大陆坡食物丰富且含氧浓度低的区域大量繁殖的物种（Verneuilinulla propinqua、Ammodiscus incertus、Buliminella dubia、Rotaliatinopsis semiinvoluta、Bolivina lowmani、Fursenkoina spinosa）。组合 3 中的物种（Globocassidulina subglobosa、Epistominella exigua、Gyroidinoides subzelandica、Reophax longicollis、Adercotryma glomeratum、Cystammina pauciloculata、Spiroplectammina biformis）偏爱具有中等有机碳和溶解氧的深水区。底栖有孔虫生态位的信息将有助于环境影响评估和古生态学研究。
