Hyperbenthos was sampled at six stations on the western slope of the Norwegian Trough. Four hauls, two day and two night replicates were taken at each station. The replicates were analyzed based on all sampled individuals of Mysidacea and Decapoda Natantia using Shannon diversity index, Spearman rank correlation, G-test, Bray-Curtis similarity index and Correspondence Analysis. The sampler provided samples of mysids and shrimps with an acceptable level of replicability based on number of individuals and diversity. In a cost-efficient context it is satisfactory to take only one sample at a station.
"1-10, means station 1 haul 10). As trawled gear never hits the same spot when repeating a station (Brattegard and Fosså, 1991), the different hauls are as different as stations in most cases (Figs. 3 and 4). Fig. 1 "
[Show abstract][Hide abstract] ABSTRACT: Abyssal macrofaunal composition of 21 epibenthic sledge hauls from twelve stations taken in the Kuril-Kamchatka Trench (KKT) and at the adjacent abyssal plain, Northwest Pacific, is presented. Sampling with the fine meshed epibenthic sledge yielded higher abundances and species richness than was reported from previous expeditions from board of RV Vityaz. In total 84,651 invertebrates were sampled with RV Sonne between July and September of 2012 (31,854 invertebrates if standardised for 1000 m² trawled distances) from 41 taxa of different taxonomic ranks (15 phyla, 28 classes, 7 orders) were sampled from a trawled area of 53,708 m² and have been analyzed. Few taxa were frequent and most taxa were rare in the samples, twelve taxa occurred with more than 1% frequency. Of these, the Polychaeta were most abundant followed by the benthic Copepoda and Isopoda. Total numbers of individuals varied between stations and were highest with 4,238 individuals at station 2–10 close to the KKT in 4,865 m depth and lowest with 374 individuals at station 6–11 in 5,305 m depth. At this station also the lowest number of taxa occurred (18 taxa) while the highest number occurred with 31 taxa at station 3–9 in 4,991 m depth. Numbers of individuals decreased with increasing depth between 4,830 and 5,780 m. Crustaceans of the superorder Peracarida were one of the dominating taxa with four orders occurring frequently in most samples. In total, Isopoda were most important and occurred with 59% of all peracarid orders sampled, followed by Amphipoda with 21%, Tanaidacea with 11%, Cumacea with 9%, and Mysidacea with <1%. The communities of the stations (and hauls) of the KKT abyssal area differ in terms of taxon composition from each other. A cluster analysis (nMDS) performed for all sampled stations revealed no clear pattern of community similarity between stations or hauls. All hauls close to the trench (2–9 and 2–10 close to the eastern slope of the KKT; and 3–9 and 4-3 at the western slope) were most different to the other hauls. Hauls 8–9 and 8–12 as well as 5–10 and 7–10 in the approximate centre of the overall research area were most similar (88% similarity). The non-isolated KKT area is characterized by higher abundances and higher benthic species richness than the geographically isolated and young deep-sea basin of the Sea of Japan.
Deep Sea Research Part II Topical Studies in Oceanography 11/2014; 111. DOI:10.1016/j.dsr2.2014.11.002 · 2.19 Impact Factor
"As the haul distances varied at different stations, the data were standardised to 1000 m² hauls for the comparative analysis. Since trawled gear never hits the same spot when repeating a station (Brattegard and Fosså, 1991), the different hauls were analyzed separately. On deck the C-EBS catches were washed through 300 mm sieves and fixed in 96% pre-cooled ethanol (first deployment) and in 4% formaldehyde (second deployment). "
[Show abstract][Hide abstract] ABSTRACT: The abyssal macrobenthos of the Kuril-Kamchatka Trench (KKT) area was sampled for the first time using a fine-meshed camera-epibenthic sledge (C-EBS) during the German-Russian KuramBio expedition 2012 (RV Sonne, 223 cruise). Crustaceans of the order Isopoda were one of the dominant macrobenthic taxa, and the family Munnopsidae was the most abundant and diverse among 17 collected asellotan families, comprising about 48 % of all isopods. During the KuramBio expedition no less than 80 species of 28 genera and eight subfamilies of Munnopsidae were collected with 21 EBS hauls at 12 stations. About 80% species are new to science and half of the genera and the subfamily Lipomerinae are recorded for the first time in the Northwest Pacific. The most abundant and speciose subfamily was Eurycopinae (58% of all specimens and 29 % of species), followed by Ilyarachninae (12% and 16 %). Most species are rare and occur with low abundance at one or few stations. Ten most numerous species belonging to the genera Eurycope (5 species), Microcope (2), Disconectes (1), Ilyarachna (1) and Aspidarachna (1) comprised 68% of all munnopsids. The species Eurycope sp.1 and Microcope ovata ( Birstein, 1970) were the most abundant and frequent species, occurring at all stations. The highest abundance of Munnopsidae and high diversity, with 32 species, occurred at station 3–9 on the western slope of the KKT. The cluster analysis of the Bray-Curtis similarity shows a low similarity between stations. The least similar was station 1–10, with only 26% similarity with other stations. Low similarity also characterized station 3–9 (34%). The comparison with known data revealed differences in species composition of Munnopsidae of the abyssal plain of the KKT area and the fauna of adjacent bathyal and hadal zones. Similar ratios of the munnopsid subfamilies and genera and some similar species have been revealed for the KuramBio and ANDEEP areas.
Deep Sea Research Part II Topical Studies in Oceanography 09/2014; 111. DOI:10.1016/j.dsr2.2014.08.016 · 2.19 Impact Factor
"This type of sledge was modified by Brandt and Barthel (1995) and later by Brenke (2005). Investigations on supra-and epibenthic macroorganisms are still limited for bathyal and especially abyssal environments, although during the last decades an increasing number of publications dealt with the results of a variety of epibenthic sledge types in different regions of the world (e.g., Brandt, 1995; Brandt et al., 1996; Brattegard and Fosså, 1991). Few investigations were performed in polar seas with different epibenthic samplers (e.g. "
[Show abstract][Hide abstract] ABSTRACT: An epibenthic sledge (EBS) was deployed at seven different deep-sea stations along the South Polar Front of the Atlantic in order to explore the composition and abundance of macrofaunal organisms and to identify the most abundant taxa in this transition zone to the Southern Ocean. In total 3130 specimens were sampled by means of the EBS on board of RV Polarstern during the expedition ANT-XXVIII/3 in the austral summer of 2012. Benthic and suprabenthic Crustacea occurred to be most frequent in the samples. Among those, copepods were by far most numerous, with 1585 specimens followed by the peracarid taxa Isopoda (236 ind.), Amphipoda (103 ind.), Tanaidacea (78 ind.) and Cumacea (50 ind.). Annelida were represented by a high number of specimens belonging to different polychaete taxa (404 ind.). The molluscan fauna was clearly dominated by Bivalvia (255 ind.), followed in numbers of specimens by Gastropoda (47 ind.). The deep-sea benthos sampled along the Southern Polar Front occurred in surprisingly low abundances, contrasting the largely high surface productivity of the area. Numbers of specimens across different macrofaunal taxa and especially of peracarid crustaceans underscored by far those from South Ocean sites at higher latitudes in the Weddell Sea.
Deep Sea Research Part II Topical Studies in Oceanography 09/2014; 108. DOI:10.1016/j.dsr2.2014.08.017 · 2.19 Impact Factor
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