Phylogenetic relationships of deep-sea mussels of the genus Bathymodiolus (Bivalvia: Mytilidae)

Miyazaki, Junichi; Shintaku, Mifue; Kyuno, Akiko; Fujiwara, Yoshihiro; Hashimoto, Jun; Iwasaki, Hiromi

doi:10.1007/s00227-003-1208-3

Cited by 35 publications

(28 citation statements)

References 36 publications

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“…While most of the Bathymodiolinae are associated with a single type of ecosystem, ubiquity with regard to substrate has already been pointed out in the cases of Bathymodiolus japonicus and Bathymodiolus platifrons, two species that occur both at seeps and vents (Miyazaki et al 2004). In this example, a multi-marker molecular study supported the result.…”

Section: Discussion (A) Species and Speciation Patternsupporting

confidence: 74%

“…First, in this scenario, species able to live in two environments play a hinge role in the colonization process and in the subsequent emergence of specialized species. Whereas most vent and seep species are specialized to one or the other ecosystem, at least two species inhabiting both were reported (Miyazaki et al 2004). Data on habitat preference for the small bathymodiolins are scarce, and thus no convincing evidence for ubiquity exists.…”

Section: Introductionmentioning

confidence: 99%

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Several deep-sea mussels and their associated symbionts are able to live both on wood and on whale falls

et al. 2008

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Bathymodiolin mussels occur at hydrothermal vents and cold seeps, where they thrive thanks to symbiotic associations with chemotrophic bacteria. Closely related genera Idas and Adipicola are associated with organic falls, ecosystems that have been suggested as potential evolutionary 'stepping stones' in the colonization of deeper and more sulphide-rich environments. Such a scenario should result from specializations to given environments from species with larger ecological niches. This study provides molecular-based evidence for the existence of two mussel species found both on sunken wood and bones. Each species specifically harbours one bacterial phylotype corresponding to thioautotrophic bacteria related to other bathymodiolin symbionts. Phylogenetic patterns between hosts and symbionts are partially congruent. However, active endocytosis and occurrences of minor symbiont lineages within species which are not their usual host suggest an environmental or horizontal rather than strictly vertical transmission of symbionts. Although the bacteria are close relatives, their localization is intracellular in one mussel species and extracellular in the other, suggesting that habitat choice is independent of the symbiont localization. The variation of bacterial densities in host tissues is related to the substrate on which specimens were sampled and could explain the abilities of host species to adapt to various substrates.

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Section: Discussion (A) Species and Speciation Patternsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Several deep-sea mussels and their associated symbionts are able to live both on wood and on whale falls

et al. 2008

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“…Subsequent studies of additional mitochondrial and nuclear genes found little evidence for differentiation among the Indian Ocean and various W. Pacific populations and raised doubts about their status as distinct species (Miyazaki et al 2004;Jones et al 2006;Won et al 2008). Kyuno et al (2009) Based on the existing molecular evidence, Thubaut et al (2013) recognize B. septemdierum as the prior synonym for B. brevior and B. marisindicus.…”

Section: Introductionmentioning

confidence: 99%

Population structure and connectivity in Indo-Pacific deep-sea mussels of the Bathymodiolus septemdierum complex

et al. 2015

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Current pressures to mine polymetallic sulfide deposits pose threats to the animal communities found at deep-sea hydrothermal vents. Management plans aimed at preserving these unusual communities require knowledge of historical and contemporary forces that shaped the distributions and connectivity of associated species. As most vent research has focused on the eastern Pacific and mid-Atlantic ridge systems less is known about Indo-Pacific vents, where mineral extraction activities are imminent. Deep-sea mussels (Bivalvia: Mytilidae) of the genus Bathymodiolus include the morphotypic species B. septemdierum, B. brevior, B. marisindicus, and B. elongatus which are among the dominant vent taxa in western Pacific back-arc basins and the Central Indian Ridge. To assess their interpopulational relationships, we examined multilocus genotypes based on DNA sequences from four nuclear and four mitochondrial genes, and allozyme variation encoded by eleven genes. Bayesian assignment methods grouped mussels from seven widespread western Pacific localities into a single cluster, whereas the Indian Ocean mussels were clearly divergent. Thus, we designate two regional metapopulations. Notably, contemporary migration rates among all sites appeared to be low despite limited population differentiation, which highlights the necessity of obtaining realistic data on recovery times and fine-scale population structure to develop and manage conservation units effectively. Future studies using population genomic methods to address these issues in a range of species will help to inform management plans aimed at mitigating potential impacts of deep-sea mining in the Indo-Pacific region.

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“…Although hydrogen sulfide is a toxic substance that inhibits cytochrome oxidase c, a respiratory enzyme (Bagarinao 1992), such ecosystems contain a large number of invertebrates for example, bivalves, polychaetes and crustaceans (Corliss et al 1979, Lutz and Kennish 1993, Ramirez-Llodra et al 2007). Bivalves of the genus Bathymodiolus, in particular, are frequently observed at both hydrothermal vents and cold seeps (Miyazaki et al 2004, Jones et al 2006. The genus Bathymodiolus is included in the family Mytilidae and the species belonging to this genus contain symbiotic chemosynthetic bacteria (e.g.…”

Section: Introductionmentioning

confidence: 99%

Comparison of taurine related compounds in deep- and shallow-water mussel species

Koito

Morimoto

et al. 2016

Plankton Benthos Res

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Densely packed invertebrate communities have been observed around deep-sea hydrothermal vents and cold seeps, despite the high concentrations of hydrogen sulfide present in these environments. The species that inhabit these environments have been reported to accumulate the sulfur-containing amino acid, thiotaurine. This non-toxic amino acid is synthesized from its precursor, hypotaurine and ambient hydrogen sulfide. In this study, we compared the levels of thiotaurine and hypotaurine in the gills and mantles of two deep-sea mussels (Bathymodiolus septemdierum and B. platifrons) and a shallow-water mussel (Mytilus galloprovincialis) to investigate their degree of dependence on the thiotaurine/hypotaurine system. The levels of thiotaurine and hypotaurine in the gill were higher than those present in the mantle in the two deep-sea species but lower or similar in M. galloprovincialis. The levels of thiotaurine and hypotaurine were the highest in the gill of B. septemdierum, estimated at 6.56 and 13.50 µmol/g wet weights, respectively. Moreover, B. septemdierum exhibited a higher thiotaurine/(hypotaurine+thiotaurine) ratio in the gill, B. septemdierum than that did B. platifrons and M. galloprovincialis. These results suggest that the levels of thiotaurine and hypotaurine in Bathymodiolus may be related to the ambient sulfide levels in their habitats.

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Phylogenetic relationships of deep-sea mussels of the genus Bathymodiolus (Bivalvia: Mytilidae)

Cited by 35 publications

References 36 publications

Several deep-sea mussels and their associated symbionts are able to live both on wood and on whale falls

Several deep-sea mussels and their associated symbionts are able to live both on wood and on whale falls

Population structure and connectivity in Indo-Pacific deep-sea mussels of the Bathymodiolus septemdierum complex

Comparison of taurine related compounds in deep- and shallow-water mussel species

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