Dataset Information

Population Structure of Blue Marlin, Makaira nigricans, in the Pacific and Eastern Indian Oceans.

ABSTRACT: Hui Chen, Chia-Hao Chang, Chi-Lu Sun, Kwang-Tsao Shao, Su-Zan Yeh, and Gerard DiNardo (2016) Blue marlin Makaira nigricans is economically important for fisheries worldwide. However, overfishing has substantially reduced the stock size. Better knowledge of blue marlin population genetics will help improve management and conservation. Previous genetic studies concluded that the Pacific blue marlin should be considered a single stock. This study investigated the population genetic structure of blue marlin inhabiting the Pacific and eastern Indian oceans based on mtDNA cytochrome b (cyt b) and control region (CR) sequence variation. We collected tissue samples (n = 183) from three Pacific and one Indian Ocean, and determined the sequences of 1140 bp of cyt b and 905 bp of CR. Phylogenetic analysis revealed that blue marlin contain two clades, the Atlantic clade and the ubiquitous clade, and that all the eastern Indian and Pacific individuals collected for this study belonged to the ubiquitous clade. All eastern Indian and Pacific blue marlin possess extremely high haplotype diversity (h) and low nucleotide diversity (?). The results of pairwise ?ST, hierarchical analysis of molecular variance (AMOVA) and spatial analysis of molecular variance (SAMOVA) all support that there is no population differentiation among eastern Indian and Pacific blue marlin. Neutrality tests and pairwise mismatch distribution analysis both indicated that eastern Indian and Pacific blue marlin have undergone a rapid population expansion on the order of 0.30 to 0.65 million years ago (mya). This study demonstrates that blue marlin in the Pacific and eastern Indian oceans constitute a single stock. International cooperation will be required to preserve blue marlin as a resource; moreover, the high genetic variation of blue marlin in this region suggests that unique haplotypes in the population are sensitive to high harvesting levels and could disappear.

SUBMITTER: Chen H

PROVIDER: S-EPMC6511819 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Population Structure of Blue Marlin, Makaira nigricans, in the Pacific and Eastern Indian Oceans.

Chen Hui H Chang Chia-Hao CH Sun Chi-Lu CL Shao Kwang-Tsao KT Yeh Su-Zan SZ DiNardo Gerard G

Zoological studies 20160809

Hui Chen, Chia-Hao Chang, Chi-Lu Sun, Kwang-Tsao Shao, Su-Zan Yeh, and Gerard DiNardo (2016) Blue marlin Makaira nigricans is economically important for fisheries worldwide. However, overfishing has substantially reduced the stock size. Better knowledge of blue marlin population genetics will help improve management and conservation. Previous genetic studies concluded that the Pacific blue marlin should be considered a single stock. This study investigated the population genetic st ...[more]

PMID: 31966178

Similar Datasets

Project description:BACKGROUND:The Indo-Pacific region has the largest number of seagrass species worldwide and this region is considered as the origin of the Hydrocharitaceae. Halophila ovalis and its closely-related species belonging to the Hydrocharitaceae are well-known as a complex taxonomic challenge mainly due to their high morphological plasticity. The relationship of genetic differentiation and geographic barriers of H. ovalis radiation was not much studied in this region. Are there misidentifications between H. ovalis and its closely related species? Does any taxonomic uncertainty among different populations of H. ovalis persist? Is there any genetic differentiation among populations in the Western Pacific and the Eastern Indian Ocean, which are separated by the Thai-Malay peninsula? Genetic markers can be used to characterize and identify individuals or species and will be used to answer these questions. RESULTS:Phylogenetic analyses of the nuclear ribosomal internal transcribed spacer region based on materials collected from 17 populations in the Western Pacific and the Eastern Indian Ocean showed that some specimens identified as H. ovalis belonged to the H. major clade, also supported by morphological data. Evolutionary divergence between the two clades is between 0.033 and 0.038, much higher than the evolutionary divergence among H. ovalis populations. Eight haplotypes were found; none of the haplotypes from the Western Pacific is found in India and vice versa. Analysis of genetic diversity based on microsatellite analysis revealed that the genetic diversity in the Western Pacific is higher than in the Eastern Indian Ocean. The unrooted neighbor-joining tree among 14 populations from the Western Pacific and the Eastern Indian Ocean showed six groups. The Mantel test results revealed a significant correlation between genetic and geographic distances among populations. Results from band-based and allele frequency-based approaches from Amplified Fragment Length Polymorphism showed that all samples collected from both sides of the Thai-Malay peninsula were clustered into two clades: Gulf of Thailand and Andaman Sea. CONCLUSIONS:Our study documented the new records of H. major for Malaysia and Myanmar. The study also revealed that the Thai-Malay peninsula is a geographic barrier between H. ovalis populations in the Western Pacific and the Eastern Indian Ocean.

Project description:We examine the large-scale distribution patterns of the nano- and microphytoplankton collected from 145 oceanic stations, at 3 m depth, the 20% light level and the depth of the subsurface chlorophyll maximum, during the Malaspina-2010 Expedition (December 2010-July 2011), which covered 15 biogeographical provinces across the Atlantic, Indian and Pacific oceans, between 35°N and 40°S. In general, the water column was stratified, the surface layers were nutrient-poor and the nano- and microplankton (hereafter phytoplankton, for simplicity, although it included also heterotrophic protists) community was dominated by dinoflagellates, other flagellates and coccolithophores, while the contribution of diatoms was only important in zones with shallow nutriclines such as the equatorial upwelling regions. We applied a principal component analysis to the correlation matrix among the abundances (after logarithmic transform) of the 76 most frequent taxa to synthesize the information contained in the phytoplankton data set. The main trends of variability identified consisted of: 1) A contrast between the community composition of the upper and the lower parts of the euphotic zone, expressed respectively by positive or negative scores of the first principal component, which was positively correlated with taxa such as the dinoflagellates Oxytoxum minutum and Scrippsiella spp., and the coccolithophores Discosphaera tubifera and Syracosphaera pulchra (HOL and HET), and negatively correlated with taxa like Ophiaster hydroideus (coccolithophore) and several diatoms, 2) a general abundance gradient between phytoplankton-rich regions with high abundances of dinoflagellate, coccolithophore and ciliate taxa, and phytoplankton-poor regions (second principal component), 3) differences in dominant phytoplankton and ciliate taxa among the Atlantic, the Indian and the Pacific oceans (third principal component) and 4) the occurrence of a diatom-dominated assemblage (the fourth principal component assemblage), including several pennate taxa, Planktoniella sol, Hemiaulus hauckii and Pseudo-nitzschia spp., in the divergence regions. Our findings indicate that consistent assemblages of co-occurring phytoplankton taxa can be identified and that their distribution is best explained by a combination in different degrees of both environmental and historical influences.

Dataset Information

Population Structure of Blue Marlin, Makaira nigricans, in the Pacific and Eastern Indian Oceans.

Publications

Population Structure of Blue Marlin, <i>Makaira nigricans</i>, in the Pacific and Eastern Indian Oceans.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets