Search published articles


Showing 4 results for Roy
Observations of Odonata (Insecta) from heterogeneous habitat patches in Bankura district with the first report of Microgomphus torquatus (Selys, 1854) from West Bengal, India
Subhajit Roy, Aniruddha Singhamahapatra, Amar Kumar Nayak,
Volume 4, Issue 2 (6-2022)
Abstract
The diversity and heterogeneity of Odonata was studied at 10 sites located across almost all parts of the Bankura district (except northwestern and northeastern boundary regions), in the state of West Bengal, India from July 2015 to June 2022. Analysis of variance and rarefaction was performed to study the β-diversity and compare the taxa abundance at the sites to understand the heterogeneity of Odonata observations. The seasonality of the species and their site-wise distribution were also studied. A total of 74 odonate species belonging to eight families, represented by 46 genera were recorded. The study adds 17 species to the known Odonata fauna of Bankura district, including the addition of Microgomphus torquatus (Selys) to the fauna of West Bengal. It also confirms the addition of Ictinogomphus kishori to the known Odonata fauna of West Bengal, which has been confused with and misidentified as Ictinogomphus distinctus for long, the latter being described from the state of West Bengal and is also found in the region adjacent to the study area. Most recorded odonates belonged to the family Libellulidae (29 species), followed by Coenagrionidae (19 species), Gomphidae (nine species), Platycnenididae (six species), Aeshnidae (five species), Macromiidae (three species), Lestidae (two species), and Chlorocyphidae (one species). Species diversity and abundance assessments are essential for conserving the habitats of the restricted and endemic (to peninsular India) species.

Observations of Papilionoidea (Lepidoptera) fauna from heterogeneous patches of Jhargram district with new distribution reports from West Bengal, India
Biswarup Mandal, Subhajit Roy,
Volume 4, Issue 4 (12-2022)
Abstract
Diversity and abundance of butterfly (Papilionoidea) species were studied intensively between January 2017 and December 2021 from six heterogeneous sites of the newly created Jhargram district in West Bengal state, India. A total of 142 species from all six butterfly families were recorded from the study sites, of which 45 belong to the family Lycaenidae, 42 to Nymphalidae, 29 to Hesperiidae, 14 from Pieridae, 11 from Papilionidae and 1 from Riodinidae. Thirteen of the species observed are new reports from the district. New distributional records of Deudorix epijarbas (Moore, [1858]), Notocrypta curvifascia (C. Felder and R. Felder, 1862) from the southern part of West Bengal are reported. Rachana jalindra (Horsfield, [1829]) is rediscovered from the southern part of West Bengal after a long period. Gangara thyrsis (Fabricius, 1775) is reported from this part of the state for only the second time. Additionally, Cupitha purreea (Moore, 1877), Gerosis bhagava (Moore, [1866]), Sarangesa dasahara Moore, [1866], Celaenorrhinus leucocera (Kollar, [1844]), Rapala pheretima (Hewitson, 1863), Athyma inara Westwood, 1850, Athyma selenophora (Kollar, [1844]) and Tanaecia lepidea (Butler, 1868) are among the other notable species which are reported for the first time from Jhargram district. The statistical analysis of the diversity and abundance of the study sites and the analysis of variance and rarefaction have been performed to study the β-diversity and compare the abundance of the sites in order to understand the heterogeneity of butterfly observations. The distribution by site of the species has also been studied.

Sexual dimorphism in external morphology and pelvis of the lesser bandicoot rat, Bandicota bengalensis (Gray, 1835) (Mammalia: Rodentia: Muridae)
Pritom Roy, Antara Das, Md. Asir Uddin, Jadab Kumar Biswas,
Volume 5, Issue 2 (6-2023)
Abstract
We used linear morphometric measurements to assess secondary sexual dimorphism in the external traits and pelvis of the lesser bandicoot rat, Bandicota bengalensis (Gray). Multivariate analysis of variance revealed significant difference between the sexes in both external (Wilks' lambda = 0.542, F = 3.378, P < 0.05) and pelvis measurements (Wilks' lambda = 0.238, F = 10.05, P < 0.05). Males were larger than females in most of the external traits. In contrast, females were larger in most variables of the pelvis. Separation between the sexes was also demonstrated in the discriminant analysis. Although allometric slopes did not differ between the sexes, means adjusted for allometry were sexually dimorphic in five out of seven variables of the pelvis. In conclusion, our results revealed differential patterns of secondary sexual dimorphism for the external morphology and pelvis in B. bengalensis. These patterns are explained with respect to the accessible evolutionary theories on mammalian sexual dimorphism.

Foraging and diving pattern of the Little Cormorant Microcarbo niger (Vieillot) (Pelecaniformes: Phalacrocoracidae) of Ecopark, Kolkata, India
Lina Chatterjee, Abhik Rong, C. S. Samrat, Saswati Sinha, Tarak Samanta, Arjan Basu Roy,
Volume 6, Issue 4 (9-2024)
Abstract
This study aims to investigate the feeding behaviour and diving habits of the Little Cormorant (Microcarbo niger) in the vicinity of Pakhibitan, which is a component of Ecopark, the largest urban park located in Newtown, Kolkata, West Bengal, India. The study took place for three days a week starting from September 2021 to February 2022. The Little Cormorant mostly used the Lake as a foraging location in Pakhibitan, with the highest number of dives (1957 dives, 10.78 ± 10.43 sec) and surface pauses (1980 surface pauses, 6.02 ± 5.48 sec) compared to a nearby smaller pond. The pattern of dive bout/surface pause showed considerable variability between lake (F = 1.055, df = 1, P > 0.05) and pond (F = 0.153, df = 1, P > 0.05). There may be a correlation between the average duration of dives and the average recovery time between dives, and the depth of the water bodies. In certain cases, longer dives were associated with longer rest periods, resulting in increased time spent searching for prey. Consequently, the foraging efficiency of the dives may decrease as the diving depth increases. The feeding behaviour of the Little Cormorant is subject to the influence of various environmental conditions, necessitating a more comprehensive investigation.

Page 1 from 1     

  | Journal of Animal Diversity

Designed & Developed by : Yektaweb