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Distribution and Genetic Divergence of Deep-Sea Hydrothermal Vent Copepods (Dirivultidae: Siphonostomatoida: Copepoda) in the Northwestern Pacific
- Source :
- Zoological Science. 38
- Publication Year :
- 2021
- Publisher :
- Zoological Society of Japan, 2021.
-
Abstract
- Copepods in the family Dirivultidae are one of the most successful meiofauna in deep-sea hydrothermal vent fields and are abundant near venting fluid. Although vents are spatially limited ocean habitats, they are distributed widely in the Atlantic, Pacific, and Indian Oceans. However, knowledge of dirivultid biogeography and phylogeography remains limited, especially in the northwestern Pacific. Here, we obtained partial mitochondrial COI gene sequences of three dirivultids from the northwestern Pacific—Stygiopontius senokuchiae and an unidentified Chasmatopontius species from vent fields in the Izu–Bonin Arc and Stygiopontius senckenbergi associated with the squat lobster Shinkaia crosnieri in the Okinawa Trough—and analyzed them in comparison with existing data. The among-species sequence diversity exceeded 80 out of 560 bp (14% or 0.166 in Kimura 2-parameter distance), whereas the within-species diversity was less than 10 bp (2% or 0.018 in Kimura 2-parameter distance), with no genetic saturation. Each species formed a monophyletic clade and the genetic region targeted is deemed reliable for identifying species and populations for these copepods. Among the three genera targeted, only Chasmatopontius formed a monophyletic cluster, while Aphotopontius and Stygiopontius did not. Species delimitation analyses suggested the existence of cryptic species in Chasmatopontius. Subdivision among local populations was observed in Aphotopontius, but not in Stygiopontius in the same distribution, implying potential differences in dispersal ability among different genera of dirivultids. Further sampling is required, to fill the spatial gaps to elucidate the biogeography and evolution of dirivultids in the global deep ocean.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Species complex
Squat lobster
Pacific Ocean
Siphonostomatoida
Ecology
Biogeography
Genetic Variation
Biology
biology.organism_classification
010603 evolutionary biology
01 natural sciences
Copepoda
Genetic divergence
03 medical and health sciences
Monophyly
Hydrothermal Vents
030104 developmental biology
Animals
Biological dispersal
Animal Science and Zoology
Animal Distribution
Phylogeny
Hydrothermal vent
Subjects
Details
- ISSN :
- 02890003
- Volume :
- 38
- Database :
- OpenAIRE
- Journal :
- Zoological Science
- Accession number :
- edsair.doi.dedup.....612e5bf88a4217f2378cbac3e94329a6
- Full Text :
- https://doi.org/10.2108/zs200153