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First record of tropical myzostomid population size structure and host infestation in Myzostoma khanhkhoaense (Myzostomida: Annelida)

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Abstract

Myzostoma khanhkhoaense is a cyst-to-free-moving myzostomid associated with the comatulid crinoid Clarkcomanthus albinotus. It induces deformations of the skeletal elements of the host’s arms, thereby making protective “baskets” in which to hide from predators. Each “basket” is inhabited by a dense aggregation up to 25 worms of different sizes. The size-abundance structure of some subpopulations (these being defined as the inhabitants of one host) shows a clear peak, which may be related to the worm’s reproductive cycle. Some subpopulations show two such peaks, which may be evidence of colonization by two different generations of worms. No subpopulations with more than two peaks were found, what is probably an indication that these worms have a short lifetime. We believe that a newly settled generation of M. khanhkhoaense undergoes no more than two reproductive cycles, starting with initial settlement, growth, and reproduction, and then — evident as the larger-size peak if a second generation of larvae settles on the same host — another round of growth and reproduction, and finally death.

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Acknowledgements

We would like to thank Drs. Temir Britayev and Alexander Tzetlin for valuable remarks on earlier drafts of this paper. We are also grateful to employees of the Joint Russian-Vietnamese Tropical Scientific and Technological Centre for their cooperation and assistance. Finally, our thanks are extended to Mr. Anatoly Bogdanov and Mr. George Davidovich (Laboratory of Electron Microscopy, MSU) for technical support. Finally, we would sincerely thank the anonymous Reviewers for friendly, detailed and valuable comments and corrections.

This study was supported by grants 18-05-60158 and 16-04-00343 from the Russian Fund for Basic Research (electron microscopy investigations). The field work and sampling were carried out with the financial support of the Joint Vietnam–Russia Tropical Science and Technology Research Center (Ecolan—E3.1 project).

Funding

This study was supported by grants 18–05-60158 and 16–04-00343 from the Russian Fund for Basic Research (electron microscopy investigations). The field work and sampling were carried out with the financial support of the Joint Vietnam–Russia Tropical Science and Technology Research Center (Ecolan—E3.1 project).

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Authors and Affiliations

  1. A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskij pr. 33, Moscow, 129164, Russia

    Elena Mekhova

  2. Coastal Branch, The Joint Russian-Vietnamese Tropical Research and Technology Center, Nguyễn Thiện Thuật, 30, Nha Trang, 57154, Vietnam

    Thanh Hai Thi Nguyen

  3. N.A. Pertsov White Sea Biological Station, Moscow State University, Leninskie Gory, 1-12, Moscow, 119234, Russia

    Glafira Kolbasova

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  1. Elena Mekhova
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  2. Thanh Hai Thi Nguyen
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  3. Glafira Kolbasova
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All authors set an aim of the study, collected samples, discussed the results, drafted the work; Elena Mekhova performed measurements, Glafira Kolbasova make SEM photos. All authors approved the version to be published and agreed the be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

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Correspondence to Elena Mekhova.

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Mekhova, E., Nguyen, T.H.T. & Kolbasova, G. First record of tropical myzostomid population size structure and host infestation in Myzostoma khanhkhoaense (Myzostomida: Annelida). Biologia 79, 2143–2150 (2024). https://doi.org/10.1007/s11756-024-01696-4

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