ORCID Profile
0000-0002-8211-1462
Current Organisations
Chittagong Veterinary and Animal Sciences University
,
University of Tokyo
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Publisher: MDPI AG
Date: 30-10-2019
Abstract: The migration of anadromous fish in heterogenic environments unceasingly imposes a selective pressure that results in genetic variation for local adaptation. However, discrimination of anadromous fish populations by fine-scale local adaptation is challenging because of their high rate of gene flow, highly connected ergent population, and large population size. Recent advances in next-generation sequencing (NGS) have expanded the prospects of defining the weakly structured population of anadromous fish. Therefore, we used NGS-based restriction site-associated DNA (NextRAD) techniques on 300 in iduals of an anadromous Hilsa shad (Tenualosa ilisha) species, collected from nine strategic habitats, across their erse migratory habitats, which include sea, estuary, and different freshwater rivers. The NextRAD technique successfully identified 15,453 single nucleotide polymorphism (SNP) loci. Outlier tests using the FST OutFLANK and pcadapt approaches identified 74 and 449 SNPs (49 SNPs being common), respectively, as putative adaptive loci under a ergent selection process. Our results, based on the different cluster analyses of these putatively adaptive loci, suggested that local adaptation has ided the Hilsa shad population into two genetically structured clusters, in which marine and estuarine collection sites were dominated by in iduals of one genetic cluster and different riverine collection sites were dominated by in iduals of another genetic cluster. The phylogenetic analysis revealed that all the riverine populations of Hilsa shad were further sub ided into the north-western riverine (turbid freshwater) and the north-eastern riverine (clear freshwater) ecotypes. Among all of the putatively adaptive loci, only 36 loci were observed to be in the coding region, and the encoded genes might be associated with important biological functions related to the local adaptation of Hilsa shad. In summary, our study provides both neutral and adaptive contexts for the observed genetic ergence of Hilsa shad and, consequently, resolves the previous inconclusive findings on their population genetic structure across their erse migratory habitats. Moreover, the study has clearly demonstrated that NextRAD sequencing is an innovative approach to explore how dispersal and local adaptation can shape genetic ergence of non-model anadromous fish that intersect erse migratory habitats during their life-history stages.
Publisher: MDPI AG
Date: 28-10-2021
Abstract: Rabbitfish (Siganidae) are coral reef fish that are distributed across erse habitats that include estuaries, mangroves, reefs, and even seaweed mats. Given their ecological ersity and natural widespread distributions across the Indo-Pacific region, we were interested to investigate the evolutionary history of this group and patterns of ergence that have contributed to their present-day distributions. In the present study, s les were collected from the South China Sea to study taxonomic and phylogenetic relationships, and ergence times. We investigated the taxonomic relationships among modern rabbitfish species, reconstructed their molecular phylogeny, and estimated ergence times among selected lineages based on a fragment of the mtDNA cytochrome oxidase I (COI) and sequences of the nuclear rhodopsin retrogene (RHO). Our results indicate that modern rabbitfish likely originated in the Indo-West Pacific during the late Eocene [37.4 million years ago (mya)], following which they erged into three major clades during the Pliocene/Pleistocene. Subsequent ersification and origins of the majority of siganids may likely be associated with episodes of paleo-oceanographic events, including greenhouse and glaciation events (Eocene–Miocene) as well as major plate tectonic events (Pliocene–Pleistocene). Some modern siganid species may naturally hybridize with congeneric species where their geographical ranges overlap. A comprehensive taxonomic analysis revealed that the phylogeny of Siganidae (cladogenesis of Clades I, II, and III) is characterized by ergence in several external morphological characters and morphometric parameters. Our study demonstrates that morphological characteristics, geographical heterogeneity, and environmental change have contributed to siganids’ historical ersification.
Publisher: Hindawi Limited
Date: 04-07-2019
DOI: 10.1111/ANU.12950
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 05-2018
Publisher: MDPI AG
Date: 15-11-2019
Abstract: A multidisciplinary approach was applied to explore deeper knowledge about the reproductive biology and ecology of the green mussel (Perna viridis) by interlinking among ecological factors, ingested gut plankton, gonad fatty acid profile, and reproductive traits. Mussels were collected throughout the year from the coastal region of the Bay of Bengal of Bangladesh, and the histological analysis of 242 mussels revealed five stages of gametogenesis with an annual spawning season from January to April. The gonadosomatic index showed a strong correlation with the water quality parameters, ingested gut plankton groups, and gonadal fatty acids, and also displayed prominent effects of seasonality. In all datasets, we performed principal component analysis in which the first two principal components showed that seasonality explained % of the variability, and the multivariate spaces of seasonality corresponded to the gonad development. High salinity, nutrients, chlorophyll a, and plankton abundance in the water column were positively correlated with gonad development and the spawning of mussels. During the development stage, mussel ingested more plankton, particularly Bacillariophyceae and Pyrrophyceae, which were an important source of increased n-3 polyunsaturated fatty acids content in gonads. Furthermore, gonads accumulated more lipids and saturated fatty acids during the mature and spawning stages, which were probably utilized during embryogenesis and early larval development as energy sources and constituents of the cell membrane. This research provides a model toward a better understanding of reproductive biological traits and how these traits are interrelated with the surrounding environmental variables of the green mussel, which would be helpful in marine aquaculture and the sustainable exploitation of the fishery resources.
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 2021
Publisher: Hindawi Limited
Date: 03-03-2020
DOI: 10.1111/ARE.14586
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 02-2017
Publisher: Hindawi Limited
Date: 25-02-2020
DOI: 10.1111/ARE.14572
Publisher: Wiley
Date: 26-08-2020
DOI: 10.1111/JWAS.12734
Publisher: Elsevier BV
Date: 09-2023
Location: Bangladesh
No related grants have been discovered for Md Asaduzzaman.