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Ghosh, Debojyoty
- Factors Impelling the Shell Selection Patterns of Hermit Crabs:A Case Study from Mangrove Entangled Biosphere of Indian Sunderbans
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Authors
Affiliations
1 Dept. of Zoology, West Bengal State University, North 24 Parganas, Pin-700126, IN
2 Dept. of Zoology, Barasat Government College, North 24 Parganas, Pin-700124, IN
3 Dept. of Zoology, Kalyani University, Nadia, West Bengal, Pin-741235, IN
4 Dept. of Zoology, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata-700118, West Bengal, IN
1 Dept. of Zoology, West Bengal State University, North 24 Parganas, Pin-700126, IN
2 Dept. of Zoology, Barasat Government College, North 24 Parganas, Pin-700124, IN
3 Dept. of Zoology, Kalyani University, Nadia, West Bengal, Pin-741235, IN
4 Dept. of Zoology, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata-700118, West Bengal, IN
Source
Journal of Environment and Sociobiology, Vol 14, No Spl (2017), Pagination: 15-16Abstract
Diverse anomuran hermit crab population inhabits the intertidal zone of the coastal regions of Sunderban Biosphere Reserve, South 24 Parganas, West Bengal. These decapods seek out and occupy empty molluscan shells of various species that provide optimal fit to protect their soft abdomen from erosion and desiccation and protect themselves from predation. This behavior of preferential shell choice by hermit crabs depends on various intrinsic factors of the shells to finally choose it as their microhabitat. The present study was done to understand the factors for optimal shell choice from a natural habitat of a part of Sunderban Biosphere Reserve (West Bengal, India). Random sampling of specimens was done from the intertidal zone of extended mud flats of Bakkhali and Frazergunj month-wise for a year that showed greater availability of one type of shell Telescopium telescopium relative to other species like Cerithidea obtusa, Pirenella cingulata, Indothias sp. etc. Twenty different molluscan shell types were chosen by two species of hermit crabs, Clibnarius infraspinatus and Clibnarius padavensis, among which latter shows greater affinity for Telescopium shells. A part of the laboratory analysis showed that the crab weight and shell weight are positively correlated at a significant level (p<0.01). The results suggested that the suite of shells used by each species was distinct and the diversity of shells chosen showed a preferential pattern. Microhabitat selection preference depends upon various factors like spatial distribution and availability of resource, durability of resource, shell weight, internal volume, shell morphometry-coiling and association of epibiotic covering of shells (scallops and barnacles).- Species Composition And Analysis Of Foraging Guilds Of Birds From A Sub-urban Sprawl: A Contemporary Study In And Around West Bengal State University Campus, North 24 Parganas District, West Bengal, India
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Authors
Affiliations
1 Department of Zoology, West Bengal State University, Berunanpukuria, P.O. Malikapur, Dist. North 24 Parganas, Pin-700126, West Bengal., IN
2 Post Graduate Department of Zoology, Barasat Government College, 10, K.N.C. Road, Barasat, Dist. North 24 Parganas, Pin-700124, West Bengal., IN
3 Department of Botany, University of Calcutta, 35, Ballygunge Circular Rd, Ballygunge, Kolkata, Pin-700019, West Bengal., IN
1 Department of Zoology, West Bengal State University, Berunanpukuria, P.O. Malikapur, Dist. North 24 Parganas, Pin-700126, West Bengal., IN
2 Post Graduate Department of Zoology, Barasat Government College, 10, K.N.C. Road, Barasat, Dist. North 24 Parganas, Pin-700124, West Bengal., IN
3 Department of Botany, University of Calcutta, 35, Ballygunge Circular Rd, Ballygunge, Kolkata, Pin-700019, West Bengal., IN
Source
Journal of Environment and Sociobiology, Vol 18, No 2 (2021), Pagination: 95-108Abstract
Natural avifaunal diversity is the nature’s reliable monitoring tool for checking ecosystem’s health and the Bengal plain is not an exception. Extensive survey with standard field ecology methods carried out during August 2018 to September, 2019 in and around the West Bengal State University (WBSU) campus revealed the presence of 65 bird species from 16 orders and 37 different families of terrestrial, aquatic and waders. Family-wise relative diversity index has been calculated and observed birds were divided into seven major categories of foraging guilds. Most bird species were found to be insectivorous (23) followed by other foraging guilds. This is perhaps the first effort in recent times to prepare a list of birds in and around the WBSU. Pertinently, only a single species of family Anhingidae was found with Near Threatened (NT) status of IUCN in the study area. The study area also has a diverse flora and water bodies, facing drastic change in becoming a sub-urban sprawl.Keywords
Avifauna, Field observations, West Bengal State University, Foraging guilds, Species list, RDi, Sub-urban sprawl.References
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