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Life-history traits of alvinocaridid shrimps inhabiting chemosynthetic ecosystems around Japan

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Abstract

Alvinocaridid shrimps are endemic and globally widespread in chemosynthetic ecosystems such as hydrothermal vents and hydrocarbon seeps. Though the biology of Atlantic alvinocaridid species have received considerable attention, little is known about their Pacific relatives. Here we described population structures and reproductive biology of three Pacific alvinocaridid species—Shinkaicaris leurokolos, Opaepele loihi, Alvinocaris longirostris—with notes on a fourth species—A. dissimilis—from several chemosynthetic ecosystems around Japan and compared their size frequency distributions and reproductive outputs. We showed that population demographics differ among these species, including a significantly larger proportion of juveniles in O. loihi and spatial variation of sex ratio in S. leurokolos, but all shared sex ratios biased toward females. The three shrimp species were characterized by relatively small sizes at onset of maturity, although this varied among sites for A. longirostris. Overall, size-specific fecundities and egg volumes of A. longirostris, O. loihi and S. leurokolos were in a similar range to Atlantic alvinocaridids. In addition, we performed egg incubation experiments of O. loihi under different temperature conditions to characterize thermal physiology during its brooding period. This confirmed a strong influence of temperature on both brooding duration and hatching rate, with a thermal preference that differs from previously published data for A. longirostris and S. leurokolos. Finally, our results indicated that these alvinocaridid species from the northwestern Pacific likely differ in reproductive timing, either through distinct brooding durations and/or distinct brooding periodicity, although further investigations are required to confirm these patterns.

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Data availability

All genetic sequences have been deposited in GenBank under accession numbers OP482454 to OP482487. Dataset on population and reproductive traits are available on the figshare repository: https://doi.org/10.6084/m9.figshare.21345183.

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Acknowledgements

We thank the captains and crews of numerous research cruises conducted on-board R/V Kairei (KR15-16, KR15-17, KR16-16), R/V Natsushima (NT05-05, NT10-17, NT13-22, NT15-13), R/V Kaiyo (KY14-01), R/V Yokosuka (YK17-17, YK19-10, YK22-05), and R/V Shinsei-Maru (KS-21-20, KS-22-2). We also thank the pilots and the operation team of the HOV Shinkai 6500 and of the ROVs Kaiko, Hyper-Dolphin, and KM-ROV during these research cruises. We gratefully acknowledge the chief scientists of the relevant expeditions: Shinsuke Kawagucci (JAMSTEC; NT10-17, KR15-16), Hironori Komatsu (National Museum of Nature and Science, Tsukuba; KS-22-2), Hiroko Makita (JAMSTEC and Tokyo University of Marine Science and Technology; YK17-17), Junichi Miyazaki (JAMSTEC; KR16-16), Tatsuo Nozaki (JAMSTEC; KS-21-20), Ken Takai (JAMSTEC; NT15-13, KY14-01, YK19-10, YK22-05), Hiroyuki Yamamoto (JAMSTEC; NT13-22, KR15-17).

Funding

PM was supported by a JAMSTEC Young Research Fellow fellowship. CC and HKW were supported by a Grant-in-Aid for Scientific Research (KAKENHI) from the Japan Society for the Promotion of Science (JSPS), grant code 18K06401.

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Contributions

PM collected specimens from the KS-21-20 expedition, carried out the identification of shrimps, including molecular barcoding, and measurement of specimens from all sampling cruises except NT13-22 and KY14-01, lead the data analysis, participated in the conception and design of the study and drafted the original manuscript; VN conducted identification, measurements and data analysis of specimens collected during NT13-22 and KY14-01 cruises, participated in the design of the study and critically revised the manuscript; JC participated in the design of the study and critically revised the manuscript. HKW carried out the collection of specimens from YK19-10, designed and conducted in vitro egg incubation experiment and its analysis, and critically revised the manuscript. YN conducted the in vitro egg incubation experiment, and critically revised the manuscript. CC collected and sorted materials from most of the relevant expeditions, assisted in drafting the original manuscript, and coordinated the study. All authors gave final approval for submission and publication of the manuscript in its current form.

Corresponding author

Correspondence to Pierre Methou.

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We have no conflict of interest.

Ethics approval

Faunal collections were conducted in Japanese exclusive economic zone by Japanese government research vessels. Research animals were invertebrate caridean shrimps and no live experiments with animals were conducted in this study.

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Responsible Editor: H.-J. Hoving.

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Methou, P., Nye, V., Copley, J.T. et al. Life-history traits of alvinocaridid shrimps inhabiting chemosynthetic ecosystems around Japan. Mar Biol 170, 75 (2023). https://doi.org/10.1007/s00227-023-04221-4

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  • DOI: https://doi.org/10.1007/s00227-023-04221-4

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