Evaluating the effect of overharvesting on genetic diversity and genetic population structure of the coconut crab

Yorisue, Takefumi; Iguchi, Akira; Yasuda, Nina; Yoshioka, Yuki; Sato, Taku; Fujita, Yasunori

doi:10.1038/s41598-020-66712-4

Cited by 17 publications

(13 citation statements)

References 63 publications

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“…In the resource evaluation of the Ryukyu archipelago population based on size composition, sex ratio, and genetic analysis, the population outside Okinawa Island was found to be negatively affected by overfishing (Yorisue et al, 2020). In particular, the influence of selective harvesting of large males is an important factor affecting the reproduction of coconut crabs (Yorisue et al, 2020). The findings of the present study would be useful for resource management, such as setting harvest sizes and periods, for sustainable usage.…”

mentioning

confidence: 66%

“…The findings of growth and population size of the non-harvested population in the northern limit of this study will be useful for conservation of this endangered species in the Ryukyu archipelago. In the resource evaluation of the Ryukyu archipelago population based on size composition, sex ratio, and genetic analysis, the population outside Okinawa Island was found to be negatively affected by overfishing (Yorisue et al, 2020). In particular, the influence of selective harvesting of large males is an important factor affecting the reproduction of coconut crabs (Yorisue et al, 2020).…”

mentioning

confidence: 99%

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Growth analysis and population size estimation of coconut crabs based on a large recapture dataset

2021

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confidence: 66%

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confidence: 99%

Growth analysis and population size estimation of coconut crabs based on a large recapture dataset

2021

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“…It is known that many crustaceans disperse over a wide area via ocean currents due to their planktonic life cycle during their larval stages in brackish waters and/or the ocean. Therefore, they have significant potential to disperse via ocean currents (McConaugha, 1992; Rocha et al, 2008; York et al, 2008; Abdullah et al, 2017; Yorisue et al, 2020). It is well documented that the distributional ranges of geographical lineages of marine organisms are greatly influenced by ocean currents (Rocha et al, 2008; York et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…The distribution patterns and ecology of crabs in riverine environments in Japan has been reported by Kobayashi (2000). The planktonic larval phase(s) predominantly determines potential dispersal ranges (McConaugha, 1992; Rocha et al, 2008; York et al, 2008; Yorisue et al, 2020). Therefore, the geographic genetic structure of most decapods is influenced by ocean currents (Cook et al, 2008; Niikura et al, 2015; Abdullah et al, 2017; Yorisue et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Phylogeography ofGeothelphusafreshwater crabs: unexpected dual dispersal routes via land and sea

Takenaka

Yano

Tojo

2022

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Aim: Dispersal is an important factor that determines the potential for colonization to pioneer sites. Most decapods employ seaward migration for reproduction with a planktonic larval phase. However, true freshwater crabs spend their entire life cycle in freshwater. Therefore, it is expected that genetic regionality can be easily detected. In this study, we focused on the genetic structures of true freshwater crabs, Geothelphusa crabs. Herein, we reveal the evolutionary history and dispersal patterns of freshwater crustaceans, for which there is limited knowledge to date. Location: Japanese Islands. Taxon: Geothelphusa dehaani (Decapoda, Potamidae). Methods: We collected and genetically analyzed 283 specimens at 138 localities from freshwater habitats across the Japanese Islands. Phylogenetic analyses were conducted on 1,796 bp of the combined dataset (mtDNA COI, 16S, and nDNA ITS1, histone H3) and 569 bp of the mtDNA COI dataset. The demographic history of G. dehaani was simulated using Approximate Bayesian Computation analysis. A salt tolerance experiment was conducted to confirm the survival rate in seawater. Results: The resulting of phylogenetic relationships detected 10 clades that were highly likely to be monophyletic. These 10 clades genetically exhibited an explicit pattern of geographical differentiation. Also, we confirmed the salt tolerance ability of these Japanese freshwater crabs. Main conclusions: The highlights of this study were the discovery of several cryptic species/lineages or undescribed species, and the completely different heterogeneous dual dispersal pathways detected within a single species; i.e., both land and ocean routes. As a result of phylogenetic analysis, it was concluded that Japanese crabs are basically genetically divided by straits. However, strong evidence for dispersion via ocean currents was also detected (i.e., a "sweepstake"), and it was also determined that G. dehaani could survive in seawater. This is the first observation of such a unique mode of expansion of a species' distribution area.

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“…Population genetic analyses using cytochrome c oxidase subunit I (COI) sequences in anchialine shrimp species in this region have revealed the presence of significant population genetic structures [ 18 , 19 ] and a northward directional gene flow [ 27 ]. Further analyses using genetic markers with greater spatio-temporal resolution than that afforded by COI sequences will allow us to elucidate in more detail the population genetic structures and gene flow patterns of these species in the distribution margin [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Extensive gene flow among populations of the cavernicolous shrimp at the northernmost distribution margin in the Ryukyu Islands, Japan

et al. 2020

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Marine cave habitats in the Ryukyu Islands, Indo-West Pacific, are located at the northern edge of the distribution of many cave-dwelling species. At distribution margins, gene flow is often more restricted than that among core populations due to the smaller effective population size. Here, we used high-throughput sequencing technology to investigate the gene flow pattern among three sampling sites of a marine cave-dwelling species at the margin of its distribution range. We collected individuals of the barbouriid shrimp Parhippolyte misticia from three marine caves in the Ryukyu Islands and performed population genetic analyses by means of multiplexed inter-simple sequence repeat genotyping by sequencing. Based on 62 single-nucleotide polymorphism markers, no clear population structure or directional gene flow pattern was found among the three sites. These results were unexpected because previous studies of other stygobitic shrimps in this region did find significant population genetic structures and northward directional gene flow patterns . Together, these inconsistent findings imply that marine cave-dwelling species in the region have different mechanisms of larval dispersal. Future studies on larval ecology and the biotic and abiotic factors influencing gene flow patterns are needed to clarify the mechanisms underlying the population dynamics of marine cave-dwelling species.

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Evaluating the effect of overharvesting on genetic diversity and genetic population structure of the coconut crab

Cited by 17 publications

References 63 publications

Growth analysis and population size estimation of coconut crabs based on a large recapture dataset

Growth analysis and population size estimation of coconut crabs based on a large recapture dataset

Phylogeography ofGeothelphusafreshwater crabs: unexpected dual dispersal routes via land and sea

Extensive gene flow among populations of the cavernicolous shrimp at the northernmost distribution margin in the Ryukyu Islands, Japan

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