scholarly journals Vertical distribution of megafauna on the Bering Sea slope based on ROV survey

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8628
Author(s):  
Elena Rybakova ◽  
Sergey Galkin ◽  
Andrey Gebruk ◽  
Nadezhda Sanamyan ◽  
Alexander Martynov
Keyword(s):  
Bering Sea ◽  
Deep Sea ◽  
Dominant Species ◽  
Depth Range ◽  
Soft Sediment ◽  
Western Bering Sea ◽  
The Family ◽  
Depth Ranges ◽  
Video Surveys ◽  
The Bering Sea

Video surveys were carried out during the 75th cruise of the RV Akademik M.A. Lavrentyev (June 2016) along the northern slope of the Volcanologists Massif, in the south-western Bering Sea. The seafloor was explored using the ROV Comanche 18. Seven dives were performed in the depth range from 4,278 m to 349 m. Overall, about 180 species of megafauna were recognised. Fifteen types of megafauna communities corresponding to certain depth ranges were distinguished based on the most abundant taxa. Dominance changed with depth in the following order: the holothurian Kolga kamchatica at the maximum depth (4,277–4,278 m); the holothurian Scotoplanes kurilensis at 3,610–2,790 m; the ophiuroid Ophiura bathybia at 3,030–2,910 m; benthic shrimps of the family Crangonidae at 2,910–2,290 m; the holothurian Paelopatides solea at 2,650–2,290 m; benthic jellyfish from the family Rhopalonematidae at 2,470–2,130 m; the enteropneust Torquaratoridae at 2,290–1,830 m; the holothurian Synallactes chuni and the ophiuroid of the genera Ophiura and Ophiocantha at 1,830–1,750 m. At depths 1,750–720 m most of the megafauna was associated with live or dead colonies of the sponge Farrea spp. Depths 720–390 m were dominated by the coral Heteropolypus ritteri and/or Corallimorphus pilatus. At 390–350 m depth, the shallowest depth range, the dominant taxon was the zoantharian Epizoanthus sp. Soft sediment megafauna communities dominated by torquaratorid enteropneusts to our knowledge have not been observed before in the deep-sea, the same as communities with a dominance of benthopelagic rhopalonematid jellyfish. The depths of the largest community changes, or the largest turnover of dominant species, were revealed at ∼2,790 m between the bathyal and abyssal zones and ∼1,750 m and ∼720 m within the bathyal zone.

scholarly journals A review of the spatial extent of fishery effects and species vulnerability of the deep-sea demersal fish assemblage of the Porcupine Seabight, Northeast Atlantic Ocean (ICES Subarea VII)

2010 ◽  
Vol 68 (2) ◽  
pp. 281-289 ◽  
Author(s):  
Imants G. Priede ◽  
Jasmin A. Godbold ◽  
Tomasz Niedzielski ◽  
Martin A. Collins ◽  
David M. Bailey ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Deep Sea ◽  
Demersal Fish ◽  
Commercial Fishing ◽  
Depth Range ◽  
Northeast Atlantic ◽  
Porcupine Seabight ◽  
Species Vulnerability ◽  
Northeast Atlantic Ocean ◽  
Depth Ranges

Abstract Priede, I. G., Godbold, J. A., Niedzielski, T., Collins, M. A., Bailey, D. M., Gordon, J. D. M., and Zuur, A. F. 2011. A review of the spatial extent of fishery effects and species vulnerability of the deep-sea demersal fish assemblage of the Porcupine Seabight, Northeast Atlantic Ocean (ICES Subarea VII). – ICES Journal of Marine Science, 68: 281–289. We review information from scientific trawl surveys carried out between 1977 and 2002 in the Porcupine Seabight and Abyssal Plain area of the Northeast Atlantic (240–4865 m water depth). Since the late 1980s, commercial bottom-trawl fisheries targeting mainly roundnose grenadier (Coryphaenoides rupestris), black scabbardfish (Aphanopus carbo), and orange roughy (Hoplostethus atlanticus) have been operating at depths of 500–1500 m, intersecting the depth ranges of 77 demersal fish species that would therefore be vulnerable to fishery effects. Comparisons of trawls pre-1989 and post-1997 indicate a significant decrease in total abundance of demersal fish down to 2500 m. Detailed analyses of the 15 most-abundant species showed that nine species with depth ranges within the commercial fishing depth have decreased in abundance. Other species were either not affected (Bathypterois dubius) or only affected at the shallow end of their range (Coryphaenoides guentheri). Species with a minimum depth of occurrence >1500 m (Coryphaenoides armatus and Coryphaenoides leptolepis) increased in abundance over part of their depth range. Decreases in abundance are probably caused by commercial fishing activities, an effect that is transmitted downslope by removal of fish at the shallow end of their depth range, resulting in declines at the deeper end of the depth range. The estimated fishery area is ca. 52 000 km2, but the potential impact probably extends to ca. 142 000 km2 and to many non-target species.

scholarly journals Demersal Fish Diversity and Molecular Taxonomy in the Bering Sea and Chukchi Sea

2021 ◽  
Author(s):  
xuehua wang ◽  
Yuan Li ◽  
Nan Zhang ◽  
Puqing Song ◽  
Ran Zhang ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Bering Sea ◽  
Chukchi Sea ◽  
Molecular Taxonomy ◽  
Demersal Fish ◽  
Fish Diversity ◽  
Dna Barcodes ◽  
The Family ◽  
Arctic Fish ◽  
The Bering Sea

Abstract DNA barcoding by sequencing a standard region of cytochrome c oxidase subunit I (COⅠ) provides an accurate, rapid method for identifying different species. In this study, we provide a molecular taxonomic assessment of demersal fishes in the Bering Sea and Chukchi Sea based on DNA barcoding, and a total of 123 mitochondrial COⅠ partial fragments with a length of 652 bp were obtained. The consensus among all sequences was determined by alignment via a BLAST search in GenBank. Phylogenetic relationships were reconstructed on the basis of neighbor-joining (NJ) trees and barcoding gaps. The 39 species investigated in this analysis were distributed among 10 families. Five families within Scorpaeniformes including 19 species accounted for almost half of the species. The next largest group was Perciformes, with 9 species, followed by Pleuronectiformes and Gadiformes, with 5 species each, and the smallest number of species belonged to Rajiformes. At the family level, Cottidae was the largest family, followed by Zoarcidae, accounting for 8 species. The other eight families—Gadidae, Pleuronectidae, Psychrolutidae, Agonidae, Liparidae, Ammodytidae, Hexagrammidae, and Rajidae—accounted for a smaller proportion of species. In brief, our study shows that DNA barcodes are an effective tool for studying fish diversity and phylogeny in the Bering Sea and Chukchi Sea. The contribution of DNA barcoding to identifying Arctic fish species may benefit further Arctic fish studies on biodiversity, biogeography and conservation in the future.

Hyperiids (Amphipoda, Hyperiidea) collected during the TALUD cruises in western Mexico. 5. Family Amphithyridae, with the description of a new species of Amphithyropsis Zeidler

Zootaxa ◽  
2021 ◽  
Vol 5039 (4) ◽  
pp. 479-494
Author(s):  
REBECA GASCA ◽  
EDUARDO SUÁREZ-MORALES ◽  
MICHEL E. HENDRICKX
Keyword(s):  
New Species ◽  
Adult Male ◽  
Deep Sea ◽  
Gravid Female ◽  
Depth Range ◽  
Western Mexico ◽  
The Family ◽  
A New Species

In order to complete the information related to the little studied deep-sea planktonic fauna of western Mexico, samples from a wide depth range (surface to 1550 m depth) were obtained using different gear. Six species and 108 individuals of hyperiid amphipods of the family Amphithyridae were collected at 26 localities, including a new species of Amphithyropsis Zeidler, 2016, which is herein described based on an adult male and a gravid female. Other species include Amphithyrus bispinosus Claus, 1879, the most abundant and frequently collected species (70 specimens at 17 localities), A. muratus Volkov, 1982 (11 specimens at 8 localities), A. sculpturatus Claus, 1879 (14 specimens at 7 localities), Paralycaea gracilis Claus, 1879 (10 specimens from 6 localities), and P. hoylei Stebbing, 1888 (one specimen from one locality). Worldwide and regional distributions are provided for each species.  

scholarly journals A new species of Aaptos (Porifera, Hadromerida, Suberitidae) from Pribilof Canyon, Bering Sea, Alaska

Zootaxa ◽  
2008 ◽  
Vol 1939 (1) ◽  
pp. 65-68 ◽  
Author(s):  
HELMUT LEHNERT ◽  
JOHN HOCEVAR ◽  
ROBERT P. STONE
Keyword(s):  
New Species ◽  
Bering Sea ◽  
Historical Review ◽  
Submarine Canyons ◽  
Remotely Operated Vehicle ◽  
Hydraulic Manipulators ◽  
The Family ◽  
The World ◽  
A New Species ◽  
The Bering Sea

The Bering Sea is predominantly a shallow sea, with a massive shelf mostly shallower than 100 m. Pribilof Canyon and Zhemchug Canyon, two of the largest submarine canyons in the world, were explored in August 2007, by the Greenpeace vessel “Esperanza”, with manned submersibles and a remotely operated vehicle (ROV) to depths of 1000 m. Specimens were collected with hydraulic manipulators operated by the pilots of the submersibles or with the ROV. Once on deck the specimens were transferred to ethanol. Pribilof Canyon is 426 km long and 1800 m deep, while Zhemchug Canyon is even larger and reaches depths of more than 2600 m (Normark and Carlson 2003). Here we describe a new species of Aaptos and compare it with representative congeners. The genus Aaptos was erected by Gray (1867) for Aaptos aaptos, described by Schmidt (1864) as Ancorina aaptos. Today, Aaptos is placed in Suberitidae Schmidt, 1870 and contains 21 species (Van Soest et al. 2005). For a more detailed historical review of the family and genus we refer to the publications of Kelly-Borges & Bergquist (1994) and to Van Soest (2002). According to Van Soest (2002), Aaptos is separated from other Suberitidae by its spherical or lobate growth forms, and by the presence of a strictly radial skeleton that contains characteristic strongyloxeas. The type species was described from the Mediterranean Sea (Algeria) and was then reported from many other areas of the world. These subsequent records likely represent additional undescribed species of Aaptos (Van Soest, 2002).

Relating trends in walleye pollock (Theragra chalcogramma) abundance in the Bering Sea to environmental factors

1995 ◽  
Vol 52 (2) ◽  
pp. 369-380 ◽  
Author(s):  
Gordon Swartzman ◽  
Emily Silverman ◽  
Neal Williamson
Keyword(s):  
Water Column ◽  
Bering Sea ◽  
Walleye Pollock ◽  
Additive Models ◽  
Theragra Chalcogramma ◽  
Thermocline Depth ◽  
Depth Range ◽  
Walleye Pollock Theragra Chalcogramma ◽  
Shelf Slope ◽  
The Bering Sea

Generalized additive models (GAM), a nonparametric regression method with less restrictive statistical assumptions than traditional regression methods, were used to model the trend in mean abundance of Bering Sea walleye pollock (Theragra chalcogramma) as a function of ocean environmental conditions including water column depth, temperature at 50 m, and depth of the thermocline. Acoustic survey data collected in the summers of 1988 and 1991 were used to test these relationships. In both surveys, mean walleye pollock abundance was highest in areas having a 70–130 m depth range and where the 50-m temperature was close to 2.5 °C. Thermocline depth, while not itself significant, had a significant effect on walleye pollock abundance through interactions with both bottom depth and temperature at 50 m. Walleye pollock in the top 50 m of the water column (mostly juveniles) were influenced differently by temperature and thermocline depth than the adult walleye pollock, which were generally deeper in the water column. The depth, temperature, and thermocline preferences of walleye pollock are hypothesized to be linked to food availability which is, in turn, related to temperature regimes or fronts along the Bering Sea shelf slope.

scholarly journals Long-term dynamics of stocks of greenland halibut Reinhardtius hippoglossoides matsuurae in the Bering Sea and Pacifc waters at Kamchatka and Kuril Islands

2018 ◽  
Vol 195 ◽  
pp. 28-47
Author(s):  
A. O. Zolotov ◽  
O. A. Maznikova ◽  
A. Yu. Dubinina
Keyword(s):  
Continental Slope ◽  
Bering Sea ◽  
Kuril Islands ◽  
Greenland Halibut ◽  
Eastern Kamchatka ◽  
The North ◽  
Western Bering Sea ◽  
Northern Kuril Islands ◽  
The Bering Sea

Despite the long history of studies, some aspects of the greenland halibut biology in the North Pacifc are still poorly known. In particular, scientifc publications on its groupings in the Bering Sea and at the continental slope of the North Pacifc and their dynamics are rather few, with exception of the western Bering Sea area from Cape Olyutorsky to the Anadyr Bay where its dynamics is well traced by surveys of Pacifc Fish. Res. Center (TINRO). All data on long-term dynamics of the greenland halibut abundance and distribution in the Bering Sea and Pacifc waters at Kamchatka and Kuril Islands are overviewed and comparatively analyzed, including materials of bottom trawl surveys conducted in 1950–2015 and published research reports, in total the data of 66 surveys (4,350 bottom trawls) in the Karaginsky and Olyutorsky Bays, 43 surveys (4,900 trawls) on the Pacifc shelf and continental slope of Kamchatka and northern Kuril Islands, and 24 surveys (2,048 trawls) at southern Kuril Islands. Biomass of greenland halibut is assessed for the western Bering Sea and the Pacifc waters at Kamchatka and the Kuriles using the data of TINRO and for the eastern Bering Sea using the published data of NOAA and NPFMC. Gradual decreasing of commercial value of the halibut groups is shown with increase of the distance from its main spawning grounds in the southeastern Bering Sea. Self-reproduction of the halibut groups supposedly decreases in the same direction. This assumption is confrmed by the data on its larvae and juveniles density in the epipelagic layer of the western Bering Sea and North-West Pacifc that decreases from the maximum values in the Anadyr Bay to the Olyutorsko-Navarinsky district and further southward to the minimum value at southern Kuril Islands. The average portions of certain groups of greenland halibut in its total biomass in the North Pacifc (without the Okhotsk Sea) are estimated as follows: almost 85 % (146.0 . 103 t) is contributed by the southeastern Bering Sea, about 14 % (23.2 . 103 t) — by Olyutorsko-Navarinsky district and the Anadyr Bay, and 1% (about 1.5 . 103 t) — by the waters at northeastern and eastern Kamchatka and at Kuril Islands. Stock dynamics is similar for all groups: the stocks increased until the early 1970s with the peak in 1976–1980, when the species biomass was estimated as 280 . 103 t in the southwestern Bering Sea, 40 . 103 t in the Anadyr Bay and Olyutorsko-Navarinsky district, and 5 . 103 t in the bays of eastern Kamchatka and at northern Kuril Islands, then declined to the minimum in 1990–2000s, and recently the peripheral groups show a gradual growth. The dynamics similarity is possibly reasoned by passive transfer of the halibut eggs and larvae from the Bering Sea toward eastern Kamchatka and Kuril Islands by the system of oceanic currents.

Feeding Characteristics of Deep-Sea Acorn Worm (Hemichordata, Enteropneusta, Torquaratoridae) from the Bering Sea

2021 ◽  
Vol 500 (1) ◽  
pp. 149-152
Author(s):  
O. V. Ezhova ◽  
M. A. Trukhan ◽  
A. I. Lukinykh ◽  
E. M. Krylova ◽  
S. V. Galkin ◽  
...  
Keyword(s):  
Bering Sea ◽  
Deep Sea ◽  
Acorn Worm ◽  
The Bering Sea
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