http://nopr.niscpr.res.in/handle/123456789/58636 2026-10-10T11:44:50Z http://nopr.niscpr.res.in/handle/123456789/58648 Title: Estimation of extreme wave heights and wind speeds in the South China Sea Authors: Wang, J C; Zang, S D; Ji, Y J; Zhang, Y H Abstract: Extreme events have significant impacts on the coastal and offshore regions. In the present paper, the return values of significant wave height and wind speed are estimated based on three different models namely generalized extreme value distribution, generalized Pareto distribution and polynomial approximation to acquire a universal and trustworthy model estimate. Here, six sites in the South China Sea with diverse geographical characteristics are considered to perform the extreme value analysis and the datasets used in the experiments were derived from the ERA-Interim reanalysis. Then the advantages and shortcomings of three different methods are discussed and analyzed in detail. The polynomial approximation method is analyzed and compared with the other methods, and it is found that this new method predominantly resolves the drawbacks encountered by the other typical extreme value estimation methods and it is suitable for estimating the return values in the South China Sea. Page(s): 685-692 2021-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58647 Title: Population composition of calanoid copepods of the Chennai coast, Tamil Nadu Authors: Sivakumar, K; Nawaz, Md A; Saboor, A Abstract: The study aims to determine the population composition of calanoid copepods from Ennore, Marina and Kovalam stations of the Chennai coast during the period of October 2018 to September 2019. Zooplankton samples were collected from 3 stations monthly. Temperature, pH, dissolved oxygen and salinity of water samples were measured. In the present study, 24 calanoid copepod species were recorded from 3 stations. Index of dominance of calanoid copepod was high in the month of October 2018 at Ennore and Kovalam stations and in the month of November 2018 was high at Marina, however, index of diversity and evenness of calanoid copepod was high in the month of March 2019 at all the stations. Labidocera aestiva showed high average density (68.99±11.11 nos/m3), followed by Subeucalanus crassus (34.40±6.75 nos/m3). Principal Component Analysis (PCA) of calanoid copepods between the species showed postive as well as negative correlations at the three sampling stations. The calanoid copepods were high (1253.80±11.66 nos/m3, 1221.20±13.49 nos/m3 and 938.90±9.45 nos/m3) in the month of March 2019 at Marina, Kovalam and Ennore stations, respectively. Calanoid copepods densities were statistically analyzed whereas, PCA highlighted about relationship among the species. Page(s): 693-700 2021-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58646 Title: Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India Authors: Saini, K C; Madhu, A; Kohli, R K; Gupta, K; Bast, F Abstract: Acetabularia (Dasycladales) is an extant genus of a single-celled green alga. There are four species of this genus reported from India, three reported from Andaman and Nicobar Islands. For this study, Acetabularia isolate was collected from a rocky intertidal habitat in the Andaman and Nicobar Islands. Light microscopy and Scanning Electron Microscopy were used for the morphological characterization. The distinct traits of caps of the thalli were prioritized because, traditionally, species delimitations in Acetabularia mainly were based on cap morphology. Our isolate showed morphological similarity with Acetabularia crenulata. However, the number of hairs in the inner ring of lobes of caps and the stalk length were observed to be different from A. crenulata and other closely related species. The phylogenetic tree constructed for partial 18S rDNA using the Maximum Likelihood (ML) method revealed the evolutionary affinity of this new species with Acetabularia dentata. Based on morphological and molecular synapomorphy, a new species of Acetabularia, Acetabularia jalakanyakae is formally proposed herein, and the further implications of this species discovery are discussed. Page(s): 701-708 2021-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58645 Title: First record of marine gastropod Prionovolva brevis (G. B. Sowerby I, 1828) from Gujarat coast, India Authors: Vadher, P; Kardani, H; Beleem, I Abstract: The present study describes a single species of marine gastropod commonly called fruit egg shell cowrie, Prionovolva brevis (G. B. Sowerby I, 1828) reported for the first time from Gujarat, India. This species was found in association with soft coral (Dendronephthya sp.) in lower intertidal zone of Sikka coast. A morphological description with key characters, illustrations and geographical distribution of present species are given. Page(s): 709-713 2021-09-01T00:00:00Z