Molecular ecology of a shallow water shrimp, Acetes sibogae sibogae Hansen 1919: Evidence for strongly limited gene flow across the western Pacific

Abstract

The shallow water shrimp Acetes sibogae sibogae is an ecological and economically important organism in the Asian region. We assessed the genetic diversity and population structure of this species based on samples obtained from eight sites in Japan, the Philippines and Indonesia. Nucleotide sequence analyses were performed based on PCR‐amplified mitochondrial DNA fragments comprising the control region and part of the 12S rRNA gene. In total, 656 bp nucleotide sequences were obtained from 377 individuals. The results show a low haplotype diversity value in shrimp from the Kokuba‐gawa River (0.5) in Japan and intermediate values (0.79–0.99) in other populations. While nucleotide diversity estimates in all sampled localities were lower (0.17%–0.86%) than those reported in other crustaceans, analysis of molecular variance revealed significant genetic differentiation (p < .001) among all sites. Furthermore, the mean fixation index estimate was very high (FST: 0.27), indicating that dispersal potential among sites was low and gene flow, therefore, was restricted. The mismatch distribution of pairwise differences between haplotypes indicated that A. s. sibogae did not fit a sudden population expansion model. Overall, the present study indicates that wild stocks of A. s. sibogae on Okinawa‐jima Island and the Philippine and Indonesian Archipelagos should be assigned high importance for conservation management of this species because adapted genotypes have significant evolutionary potential during environmental changes. [Correction added on 5th February 2022, after first online publication: Values have been corrected in the Abstract section.]

Molecular analysis of the blood cockle, Tegillarca granosa (Linnaeus 1758) from Indonesia

“…The Wallace Line, which divides Indonesia into two physically distinct parts, has been demonstrated to have a significant influence on genetic variations in numerous marine species between the east and west region [3]. [4] [5]. Similar findings were found in a prior investigation that used sequencing data from four molecular markers (two mitochondrial and two nuclear) [26].…”

Genetic structure of the commercially important Asian monsoon scallop, Amusium pleuronectes (Linnaeus 1758), across the Indonesian Archipelago

“…Whether this also affects marine animals is still a mystery. recent studies on marine taxa across the target location of this study have reported population structures such as crustaceans (Hardianto, Fukuchi, et al., 2022; Hardianto, Wijayanti, et al., 2022; Wainwright et al., 2020a), fish (Ackiss et al., 2013; Hardianto et al., 2023), coral reef (Wainwright et al., 2020b), sea urchin (Wainwright et al., 2019) and shellfish (Kusnadi et al., 2022). The structured populations were attributed to several factors including historical and contemporary interplay among a complex set of ecological, demographic, behavioural, genetic, oceanographic, climatic and/or tectonic processes.…”

“…Whether this also affects marine animals is still a mystery. recent studies on marine taxa across the target location of this study have reported population structures such as crustaceans (Hardianto, Fukuchi, et al, 2022;Wainwright et al, 2020a), fish (Ackiss et al, 2013;, coral reef (Wainwright et al, 2020b), sea urchin (Wainwright et al, 2019) and shellfish (Kusnadi et al, 2022).…”

“…This major marine current is fast enough to severely restrict larval and adult dispersal in many aquatic taxa Hardianto, Fukuchi, et al, 2022). The significant genetic structure evident in all sampled populations of the target species east and west of the Wallace Line adds weight to the previous recognition of the impact of this barrier on dispersing a wide variety of marine organisms across Wallacea.…”

“…has been reported in studies of genetic diversity and population structures in a variety of marine taxa, including the crustaceans (Hardianto, Fukuchi, et al, 2022;Wainwright et al, 2020a), fish (Ackiss et al, 2013;, coral reef (Wainwright et al, 2020b), sea urchin (Wainwright et al, 2018), and bivalve (DeBoer et al, 2014;Fauvelot et al, 2003;Hui et al, 2016;Kusnadi et al, 2022). This regional scale of population divergence between Pacific and Indian Ocean tropical/subtropical populations of marine organisms has often been linked to historical climatic events that produced Pleistocene low-sea stands (DeBoer et al, 2008).…”