Distribution and Genetic Divergence of Deep-Sea Hydrothermal Vent Copepods (Dirivultidae: Siphonostomatoida: Copepoda) in the Northwestern Pacific

Watanabe, Hiromi; Senokuchi, Reina; Nomaki, Hidetaka; Kitahashi, Tomo; Uyeno, Daisuke; Shimanaga, Motohiro

doi:10.2108/zs200153

Cited by 4 publications

(13 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nomaki et al, 2019). Furthermore, haplotype network analysis of this species revealed that populations at those knolls have almost the same genetics (Watanabe et al, 2021). These observations suggest that all S. senokuchiae in this hydrothermal-vent area have comparable ecologies and similar stable carbon isotopic compositions.…”

Section: Discussionmentioning

confidence: 64%

“…The δ 13 C values of Dirivultidae, mainly consisting of S. senokuchiae , were similar at Myojin-sho and the neighbouring seamount Bayonnaise Knoll (Figure 5; Nomaki et al ., 2019). Furthermore, haplotype network analysis of this species revealed that populations at those knolls have almost the same genetics (Watanabe et al ., 2021). These observations suggest that all S. senokuchiae in this hydrothermal-vent area have comparable ecologies and similar stable carbon isotopic compositions.…”

Section: Discussionmentioning

confidence: 99%

“…However, details about their ecologies, particularly the development and life cycles of dirivultid copepods, are still limited (Ferrari & Dahms, 2007;Ivanenko et al, 2007). The high genetic connectivity between dirivultid copepods at different hydrothermal-vent fields (Gollner et al, 2016;Watanabe et al, 2021) suggests that they have high dispersal ability across several tens to thousands of kilometres. Indeed, abundant copepodites of dirivultids have been found in the water column above a vent field, enabling them to disperse to or colonize other vent fields (Gollner et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bacterivory of the hydrothermal-vent-specific copepod Stygiopontius senokuchiae (Dirivultidae, Siphonostomatoida) from copepodite through adult stages

et al. 2023

Self Cite

View full text Add to dashboard Cite

Stygiopontius senokuchiae is a hydrothermal-vent-specific copepod species (Dirivultidae, Siphonostomatoida) and abundantly distributes near vent orifices. This species is thought to have an early juvenile planktic stage, and previous studies using bulk tissue stable-isotope and radioisotope data suggest that adults ingest chemoautotrophic microbes growing on vent chimneys. However, ontogenetic changes in their diets have not been investigated. We analysed gut contents of copepodite I to adult stages of S. senokuchiae collected from a hydrothermal-vent chimney at the Izu-Ogasawara Arc to check for the presence of bacterial cells in oral tubes and guts. We compared these results with an unidentified co-occurring calanoid and a species of Ectinosoma (Harpacticoida) and to other Siphonostomatoid copepods, namely Hatschekia labracis (Hatschekiidae), which was attached to a scarbreast tuskfin (Choerodon azurio, Labridae), and Asterocheres sp. 1 (Asterocheridae), which was attached to a spirastrellid sponge. Carbon isotope ratios of S. senokuchiae at different stages and Ectinosoma were measured to complement the nutritional insights obtained from gut-content analysis. Our results clearly showed that most S. senokuchiae individuals possessed bacteria in the oral tube or gut regardless of growth stage, whereas the coexisting Ectinosoma and calanoid did not. The carbon isotopic compositions confirmed that S. senokuchiae gains its nutrition from chemoautotrophic bacteria that use the rTCA carbon-fixation pathway. Comparisons with other Siphonostomatoida copepods suggest that Dirivultidae are specifically adapted to feed on bacteria at hydrothermal-vent chimneys, allowing their high dominance and evolutionary success in these habitats.

show abstract

Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bacterivory of the hydrothermal-vent-specific copepod Stygiopontius senokuchiae (Dirivultidae, Siphonostomatoida) from copepodite through adult stages

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Dirivultidae (Siphonostomatoida) exist in the tens to hundreds of thousands of individuals per vent wherever basalt rock, hard-shelled megafauna assemblages, or patches of dead organisms creating landscapes of exoskeletons exist (Diaz-Recio Lorenzo et al, 2021;Gollner et al, 2010Gollner et al, , 2016. The Dirivultidae (Siphonostomatoida) contains at least 80 described species that have adapted to vent environments, dominating areas of high temperatures with high concentrations of hydrogen sulphide and low oxygen levels where they feed predominantly on chemoautotrophic bacteria (Diaz-Recio Lorenzo et al, 2021;Gollner et al, 2016;Nakasugi et al, 2021;Nomaki et al, 2019Nomaki et al, , 2023Watanabe et al, 2021). They have a lecithotrophic developmental mode and likely disperse via hydrothermal plumes, settling as vent-obligate adults.…”

Section: Introductionmentioning

confidence: 99%

Highly structured populations of copepods at risk to deep‐sea mining: Integration of genomic data with demogenetic and biophysical modelling

Diaz‐Recio Lorenzo,

Tran Lu Y,

Brunner

et al. 2024

Molecular Ecology

View full text Add to dashboard Cite

Copepoda is the most abundant taxon in deep‐sea hydrothermal vents, where hard substrate is available. Despite the increasing interest in seafloor massive sulphides exploitation, there have been no population genomic studies conducted on vent meiofauna, which are known to contribute over 50% to metazoan biodiversity at vents. To bridge this knowledge gap, restriction‐site‐associated DNA sequencing, specifically 2b‐RADseq, was used to retrieve thousands of genome‐wide single‐nucleotide polymorphisms (SNPs) from abundant populations of the vent‐obligate copepod Stygiopontius lauensis from the Lau Basin. SNPs were used to investigate population structure, demographic histories and genotype–environment associations at a basin scale. Genetic analyses also helped to evaluate the suitability of tailored larval dispersal models and the parameterization of life‐history traits that better fit the population patterns observed in the genomic dataset for the target organism. Highly structured populations were observed on both spatial and temporal scales, with divergence of populations between the north, mid, and south of the basin estimated to have occurred after the creation of the major transform fault dividing the Australian and the Niuafo'ou tectonic plate (350 kya), with relatively recent secondary contact events (<20 kya). Larval dispersal models were able to predict the high levels of structure and the highly asymmetric northward low‐level gene flow observed in the genomic data. These results differ from most studies conducted on megafauna in the region, elucidating the need to incorporate smaller size when considering site prospecting for deep‐sea exploitation of seafloor massive sulphides, and the creation of area‐based management tools to protect areas at risk of local extinction, should mining occur.

show abstract

“…Furthermore, spatial differences in order-level copepod taxonomic composition on venting chimney surfaces were significantly correlated with differences in the availability of vent chemoautotrophic carbon. At the sites with higher values of stable carbon isotope ratios (δ 13 C) of organic matter in the detritus (suggesting a higher contribution of chemoautotrophic bacteria), Siphonostomatoida dominated, mainly Stygiopontius senokuchiae, the first species of Dirivultidae found in the area (Uyeno et al, 2018; Watanabe et al, 2021). In contrast, Harpacticoida, another highly abundant copepod taxon, showed decreased frequencies with increasing δ 13 C values at vent sites in those knolls (Senokuchi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Simple harpacticoid composition observed at deep hydrothermal vent sites on sea knoll calderas in the North-west Pacific

et al. 2021

Self Cite

View full text Add to dashboard Cite

Dirivultid copepods (Siphonostomatoida), one of the most successful meiobenthic organisms found at deep-sea hydrothermal vents, have been the focus of most previous ecological studies among meiofauna in these habitats. The ecology of Harpacticoida, a major benthic copepod group in typical deep-sea floor, however, is not well understood in terms of variations in community structure and controlling factors at venting sites. The spatial heterogeneities in benthic harpacticoid composition and their association with environmental parameters were investigated at hydrothermal vent chimney structures in the calderas of three neighbouring sea knolls (Bayonnaise Knoll, Myojin Knoll and Myojin-sho Caldera) in the western North Pacific. While a previous study had reported the distribution of dirivultids was strongly associated with spatial differences in stable carbon isotopic signatures (δ13C) of organic matter in the detritus on active chimneys in the field, multivariate analyses detected no significant corelation between the parameter and harpacticoid composition in this study. Instead, high associations of the harpacticoid composition with differences in water depth and total organic carbon (TOC) concentration were detected. Ectinosomatidae dominated at vent sites with lower TOC values in the shallowest Bayonnaise Knoll, while they were less prevalent at deeper vent fields in the other knolls, where Miraciidae was the most abundant family. This study indicated the availability of vent chemoautotrophic carbon is not a primary factor controlling the composition of harpacticoids even in the habitats on the hydrothermal vents, but instead by the food amount, regardless of its resources (including marine snow from the sea surface), in the study area.

show abstract

Distribution and Genetic Divergence of Deep-Sea Hydrothermal Vent Copepods (Dirivultidae: Siphonostomatoida: Copepoda) in the Northwestern Pacific

Cited by 4 publications

References 33 publications

Bacterivory of the hydrothermal-vent-specific copepod Stygiopontius senokuchiae (Dirivultidae, Siphonostomatoida) from copepodite through adult stages

Bacterivory of the hydrothermal-vent-specific copepod Stygiopontius senokuchiae (Dirivultidae, Siphonostomatoida) from copepodite through adult stages

Highly structured populations of copepods at risk to deep‐sea mining: Integration of genomic data with demogenetic and biophysical modelling

Simple harpacticoid composition observed at deep hydrothermal vent sites on sea knoll calderas in the North-west Pacific

Contact Info

Product

Resources

About