Echinoderms of the Kuril-Kamchatka Trench

Миронов, А. Н.; Dilman, Anna B.; Gebruk, Andrey; Kremenetskaia, Antonina; Minin, K. V.; Смирнов, И. С.

doi:10.1016/j.pocean.2019.102217

Cited by 11 publications

(9 citation statements)

References 28 publications

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“…At D110, however, large gathering of Elpidiids were observed, which might be owing to the special topography (sea 4.3 for detailed discussion). Ophiuroidea and Crinoidea are reported in many other hadal trenches before (Jamieson, 2015;Mironov et al, 2019), this study is the first report of these two groups of Echinoderms in the Yap Trench. One msp of Ophiuroid belonging to Ophiopyrgidae was discovered on the surface of sediment from both north and south sections.…”

Section: Hadal Fauna In the Yap Trenchmentioning

confidence: 53%

Megafaunal Community Structure From the Abyssal to Hadal Zone in the Yap Trench

et al. 2021

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Hadal trenches remain one of the unexplored ocean ecosystems due to the challenges of sampling at great depths. It is still unclear how a faunal community changes from the abyssal to the hadal zone, and which environmental variables are the key impacting factors. In this study, nine dives of the Human Occupied Vehicle (HOV) “JIAOLONG” were conducted from abyssal to hadal depths (4,435–6,796 m) in the Yap Trench on the southeastern boundary of the Philippine Sea Plate in the western Pacific, divided into 48,200 m video transects, to describe the megafaunal communities and reveal their relationship with environmental factors. A total of 1,171 megafauna organisms was recorded, 80 morphospecies (msps) from 8 phyla were identified based on the video data, most of which were reported for the first time in the Yap Trench. Arthropoda was the most abundant phylum and Echinodermata was the most diverse phylum of the megafaunal community. The faunal abundance increased with depth, whereas the Shannon diversity index decreased with depth. Cluster analysis suggested seven assemblages, with five abyssal groups, one mixed group, and one hadal dominant group. Although megafaunal communities changed gradually from abyssal zone to hadal zone, both PERMANOVA and PERMDISP analyses revealed that the communities are significantly different between abyssal zone and hadal zone, indicating 6,000 m as the boundary between the two depth zones. Depth, substrate, slope, and latitude were identified as four important environmental factors with significant influence on megafaunal community structure. This study proposed a transition pattern from the abyssal to hadal zone in the Yap Trench, highlighted the importance of habitat heterogeneity in structuring megafaunal community in a hadal trench.

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Section: Hadal Fauna In the Yap Trenchmentioning

confidence: 53%

Megafaunal Community Structure From the Abyssal to Hadal Zone in the Yap Trench

et al. 2021

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“…As shown earlier, the bottom macrofauna on the Kuril Basin floor is generally rich and is not inferior in taxonomic diversity to the abyssal macrofauna of the Kuril-Kamchatka Trench region (Brandt et al, 2015(Brandt et al, , 2018. However, the species richness of most taxonomic groups of macrofauna dominating in abundance at the bottom of the Kuril Basin is lower than that in the abyssal zone of the Pacific Ocean off the Kuril Islands (Fukumori et al, 2018(Fukumori et al, , 2019Kamenev, 2018bKamenev, , 2019Mironov et al, 2018Mironov et al, , 2019bGolovan et al, 2019). This can be caused by many factors, including differences in the amount of material collected and the area of the regions covered by the study, a narrower range of abyssal depths, less habitat diversity and a lower oxygen concentration in the bottom layer of the Kuril Basin, a greater isolation of the Sea of Okhotsk from the Pacific Ocean (Ushakov, 1953;Savilov, 1961;Fukumori et al, 2018;Kamenev, 2018b;Mironov et al, 2018).…”

Section: Kuril Basin (Sea Of Okhotsk)mentioning

confidence: 70%

“…The main goal of these expeditions was to study the species composition and distribution patterns of bottom animals, as well as to assess the faunal relationships in the deep-sea ecosystems of the Sea of Okhotsk and the Kuril-Kamchatka Trench separated by such a natural barrier as the Kuril Islands Brandt et al, 2019). As a result, numerous species from different taxonomic groups of animals were described, the composition of macro-and meiofauna and the patterns of distribution of the main taxonomic groups of animals were studied, the faunal relationship and levels of endemism of these deep-sea areas were estimated (e.g., Maiorova, 2018, 2019;Alalykina, 2018;Brandt et al, 2018Brandt et al, , 2019Polyakova, 2018, 2019;Fukumori et al, 2018Fukumori et al, , 2019Kamenev, 2018aKamenev, ,b, 2019Kamenev, , 2020Maiorova and Adrianov, 2018a,b;Brandt, 2018, 2020;Mironov et al, 2018Mironov et al, , 2019bBorisanova and Chernyshev, 2019;Brandão et al, 2019;Mordukhovich et al, 2019;Schmidt et al, 2019;Alalykina and Polyakova, 2020;Maiorova and Adrianov, 2020;Saeedi and Brandt, 2020). However, the analysis of the quantitative distribution of macro-and meiofauna in the Kuril Basin has not been completed, and only preliminary results of the macrofauna abundance study have been reported for the Kuril-Kamchatka Trench (Lins and Brandt, 2020).…”

Section: Introductionmentioning

confidence: 99%

Macrofauna and Nematode Abundance in the Abyssal and Hadal Zones of Interconnected Deep-Sea Ecosystems in the Kuril Basin (Sea of Okhotsk) and the Kuril-Kamchatka Trench (Pacific Ocean)

et al. 2022

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The Kuril Basin and the Kuril-Kamchatka Trench are two interconnected deep-sea ecosystems both located in one of the most highly productive regions of the world’s oceans. The main distinguishing features of these deep-sea ecosystems are the low oxygen concentration in the near-bottom water in the Kuril Basin, and the high hydrostatic pressure in the trench. We investigated the abundance of meio- and macrobenthic nematodes and macrofauna on the Kuril Basin floor (depths of 3,300–3,366 m) and in the Kuril-Kamchatka Trench area (depths of 3,432–9,539 m), as well as the influence of some environmental factors on the quantitative distribution of bottom fauna. This was not studied so far. The study also focused on the species composition and quantitative distribution of Polychaeta and Bivalvia, which were dominant in abundance among macrofaunal samples. The main factors influencing the quantitative distribution of macrofauna and nematodes were depth, oxygen concentration, and structure of bottom sediments. The Kuril Basin bottom communities are characterized by a high abundance of nematodes and macrofauna, a high species richness of polychaetes, and a pronounced dominance of small-sized species of Polychaeta and Bivalvia, which are probably more tolerant to low oxygen concentrations. Compared to the Kuril Basin, the Kuril-Kamchatka Trench area (at depths of 3,432–5,741 m) had a more diverse and abundant macrofauna, and a very high abundance of meio- and macrobenthic nematodes. In the trench (at depths more than 6,000 m), the diversity of macrofauna and the abundance of macrobenthic nematodes decreased, while the abundance of macrofauna increased with increasing depth. On the trench floor, the macrofaunal abundance was highest due to the high density of populations of several bivalve and polychaete species, apparently adapted to the high hydrostatic pressure on the trench floor. Obviously, the high primary production of surface waters supports the diverse and abundant deep-sea bottom fauna in the studied areas of the northwestern Pacific. Furthermore, a large number of animals with chemosynthetic endosymbiotic bacteria were found in the bottom communities of the Kuril Basin and the Kuril-Kamchatka Trench. This suggests a significant contribution of chemosynthetic organic carbon to functioning of these deep-sea ecosystems.

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“…The deep-sea northwest Pacific echinoderm fauna is one of the most species rich [4]. Data on the northwest Pacific deep-sea holothurians began accumulating since the HMS Challenger, USFS Albatross and the local Japanese cruises, from 1875 to the early 20th century [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

New and Poorly Known Species of Peniagone (Holothuroidea, Elpidiidae) from the Northwest Pacific Ocean with Discussion on Phylogeny of the Genus

et al. 2021

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The northwest Pacific fauna of Peniagone includes at least seven species. In the present study we considered the following six species: Peniagone dubia and P. mus are re-described, P. minuta and P. saveljevae are described as new to science, additional information is provided on P. vitrea and P. cf. purpurea. Peniagone japonica was not included in the analysis. A potentially new species Peniagone sp. “miniatura” was distinguished based on morphological and molecular data but not formally described due to insufficient material. In the northwest Pacific, the species of Peniagone are distributed from 2400 to 8200 m. The bathymetric range of most of the species is narrow except for P. mus being also one of the deepest representatives of the genus. Only one species, P. vitrea, is known outside the northwest Pacific region. Partial sequences of COI and 16S rDNA were obtained for provisionally ten species of the genus (four of them from the northwest Pacific) and two other species of Elpidiidae which were used as an outgroup in phylogenetic analyses. The phylogenetic analyses results suggest that the northwest Pacific species of Peniagone are not closely related.

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Echinoderms of the Kuril-Kamchatka Trench

Cited by 11 publications

References 28 publications

Megafaunal Community Structure From the Abyssal to Hadal Zone in the Yap Trench

Megafaunal Community Structure From the Abyssal to Hadal Zone in the Yap Trench

Macrofauna and Nematode Abundance in the Abyssal and Hadal Zones of Interconnected Deep-Sea Ecosystems in the Kuril Basin (Sea of Okhotsk) and the Kuril-Kamchatka Trench (Pacific Ocean)

New and Poorly Known Species of Peniagone (Holothuroidea, Elpidiidae) from the Northwest Pacific Ocean with Discussion on Phylogeny of the Genus

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