Replicability of an epibenthic sampler
ABSTRACT 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.
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ABSTRACT: SARSIA NEGOESCU, ILEANA & JÖRUNDUR SVAVARSSON 1997 10 06. Anthurideans (Crustacea, Isopoda) from the North Atlantic and the Arctic Ocean. – Sarsia 82:159-202. Bergen. ISSN 0036-4827. Eight species of the suborder Anthuridea (Crustacea, Isopoda) were collected in the northernmost part of the North Atlantic and in the Arctic Ocean during the BIOICE project. Two species were new to science: Haliophasma mjoelniri sp. nov. found at depths between 340 and 508 m west of Iceland, and Quantanthura tyri sp. nov. at depths between 304 and 1212 m south-west and west of Iceland. Other species found were Ananthura sulcaticauda BARNARD, 1925, Calathura brachiata (STIMPSON, 1853), Leptanthura affinis (BONNIER, 1896), L. chardyi NEGOESCU, 1992, L. micrura KENSLEY, 1982, and L. victori NEGOESCU, 1985. All eight species were found in the North Atlantic Ocean, and only Ananthura sulcaticauda and Calathura brachiata were additionally found in the Arctic Ocean. A. sulcaticauda and L. affinis are redescribed. The male of L. affinis shows remarkable sexual dimorphism in the shape of pereopods 4 to 6. A new character, the structure of the comb of setae on article 3 of the mandibular palp, is suggested as valuable for distinguishing the genera within the family Antheluridae. It is concluded that most of the North Atlantic anthurideans are shallow water species, mostly restricted to the Caribbean Sea. The species living in the northernmost part of the North Atlantic belong mainly to genera with a wide bathymetrical distribution and to species rich genera in the area. The Greenland-Iceland-Faeroe Ridge may restrict the dispersal of the deep-living species into the Arctic Ocean, while a rapid decline in the temperature may restrict the dispersal of the shallow living species into the Arctic.
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ABSTRACT: Weisshappel JB. 2001. Distribution and diversity of the hyperbenthic amphipod family Calliopiidae in the different seas around the Greenland-Iceland-Faeroe-Ridge. Sarsia 86:143-151. A mainly different species composition was found for the hyperbenthic family Calliopiidae in the northernmost part of the North Atlantic Ocean and the southernmost part of the Arctic Ocean, where 72 % of the species were restricted to only one side of the Greenland-Iceland-Faeroe-Ridge (GIF-Ridge). The distribution limits of the calliopiids are suggested to follow relatively sharp boundaries between water masses of different origin lying on and adjacent to the GIF-Ridge or within the area on each side of the ridge, combined with the geographical barrier effect of the ridge against dispersal of especially deep-living species. The diversity of the calliopiids was much higher north (17 species) than south (5 species) of the GIF-Ridge, showing increasing diversity with increasing latitude. The much higher diversity in the arctic waters harmonises with the knowledge of the main part of the northern hemisphere calliopiids to be arctic and subarctic species which have to cross the GIF-Ridge to get into the North Atlantic.
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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; DOI:10.1016/j.dsr2.2014.11.002 · 2.76 Impact Factor