Abstract
The two Manila clam forms living in the Sea of Japan and in the Adriatic Sea were compared genetically and morphologically to identify traits that could be used to authenticate these geographic forms. COX1 DNA barcoding confirmed that both forms of these venerid bivalve belong to the species Ruditapes philippinarum (Adams and Reeve, 1850). It has also been shown that, based on COX1 analysis, it is not possible to separate these forms into different clusters based on geographic origin. However, some morphological features make it possible to differentiate these forms. It is noted that the contour of the shells of the Adriatic and Pacific molluscs is rounded and oblong, respectively. Underwater analysis of Pacific clams showed that shell color may be specific to specimens found at certain collection sites and differ between specimens taken from different collection sites. In the spermatogenesis of Adriatic and Pacific clams, a difference was found in the cellular mechanism of interaction between germplasm granules and mitochondria, manifested by distant contact and direct contact. Spermiogenesis has three similar lines of acrosome development, but differs in the number of ways in which the nucleus is formed. Due to the variability of the ways of sperm formation, heteromorphic morphs of spermatozoa are formed, the total number of which is six for the species R. philippinarum. In the Adriatic Manila clam, five morphs from this set are expressed. The Pacific Manila clam has only three sperm morphs. Only two sperm morphs are similar in both forms. In addition, each form is distinguished by the presence of unique sperm morphs and each form has its own type of dominant spermatozoon. Thus, the contour and color of the shells, as well as cytologic markers that have been found in the mechanisms of differentiation of meiotic cells and the characteristics of spermatozoa, can be used to distinguish the Adriatic and Pacific forms of the bivalve mollusc R. philippinarum.
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The datasets generated and analysed during the current study are available from the corresponding author on request, and will be available in ResearchGate after publication of the article.
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Acknowledgements
Many thanks to Diving Department Head A. Goloseev and to divers N. Prohorov, K. Dudka, A. Oskolkov, M. Eremenko, I. Krasilnikov, S. Izrailskiy (National Scientific Centre of Marine Biology, Vladivostok, Russia) for very professional collection of R. philippinarum. Many thanks to Elizabeth Alexandrov for photographing mollusc shells. We are deeply indebted to Denis Fomin for the helpful assistance during observations with the scanning electron microscope and transmission electron microscope in the Microscopy Core Facility of the National Scientific Centre of Marine Biology (Vladivostok, Russia). A part of the electron microscopy study was done in the Microscopy Facility at St. Francis Xavier University (Antigonish, NS, Canada).
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Part of the genetic testing was funded by the Italian Ministry of Education, University and Research MIUR-SIR Programme (Grant Number RBSI14G0P5) funded to LM.
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All authors contributed to the study. AR conceived, design the study, analyzed the data, wrote the paper. LM analyzed the data, revised the paper. GP, MI collected the samples, performed genetic analyses, revised the paper. YR participated in the work using scanning electron microscopy and performed statistical analyses. EZ participated in genetic analyses. EV, YA, AA, EP collected samples, performed routine work using scanning electron microscopy and transmission electron microscopy. All authors read and approved the final version of the manuscript.
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Reunov, A., Vekhova, E., Milani, L. et al. In the Sea of Japan and the Adriatic Sea, a COX1 DNA test revealed genetic similarity of Manila clams, although shell parameters, spermatogenesis patterns, and sperm characteristics are area specific. Biologia 78, 2803–2817 (2023). https://doi.org/10.1007/s11756-023-01414-6
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DOI: https://doi.org/10.1007/s11756-023-01414-6