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  • Taylor & Francis  (3)
  • 1
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    The sponge association of the abyssal Norwegian Greenland Sea: Species composition, substrate relationships and distribution (1993)
    Taylor & Francis
    In:  Sarsia, 78 (2). pp. 83-96.
    Details
    Publication Date: 2018-03-05
    Description: During the ‘Meteor’ Expedition 13 in July and August 1990 to the northern part of the Norwegian Sea off west Spitsbergen, 7 stations with a depth of 2000 m or more were sampled with Agassiz trawl or hyperbenthos sledge, 14 more with a large box corer. Sponges were found at 6 of the trawl stations and in 2 box cores. A total of 19 species occurred, most of which were new to the area. Eight of the species were encountered more often than the other 11. Literature review and check of unpublished samples showed that by distribution, frequency of occurrence or abundance these species can be defined as the typical sponge association of the Norwegian and Greenland abyssal sea. This sponge association has a wide occurrence over the deep Norwegian-Greenland seas and parts of the Arctic basins. The analysis of substrate utilization of the 8 core species shows that all of them are able to colonize soft bottom, even some that previously had been considered to be dependent on hard substrate exclusively. Alternative substrate utilization and, in some species, the adoption of an infaunallife style are judged to be major reasons for the success of these species in the deep sea. The infaunal life style of the species Thenea abyssorum, Trichostemma sol and Tentorium semisuberites is documented and population structure data are given for the first time.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/00364827.1993.10413524
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Do hexactinellids structure antarctic sponge associations? (1992)
    Taylor & Francis
    In:  Ophelia, 36 (2). pp. 111-118.
    Details
    Publication Date: 2018-03-01
    Description: This paper presents an idea on the possible structuring effect of hex actinellids on Antarctic sponge associations. To this end, information derived from underwater photography performed on the eastern Weddell Sea shelf is reported and original trawl data are presented. Underwater photography shows the existence of different sponge associations; species poor associations are connected to soft bottom, species rich associations exist on substrates characterized by bryozoan debris and especially sponge spicule mats. The trawl. catches show differences in the population structure of a hexactinellid sponge, Rassella racovitzae Topsent at two stations, distinguishable from each other by substrate structure. On average small and therefore probably young specimens were found on bryozoan debris, while a population with larger and probably older specimens was found on solid hexactinellid spicule mats. These observations form the basis for the hypothesis that hexactinellid sponges are a major biological structuring agent for Antarctic sponge associations; they colonize soft substrate and bryozoan debris dominated areas and subsequently change the quality of the substrate by spicule deposition. The ensuing spicule mats are a suitable settling ground for a large number of demosponge species dependent on hard substrates. Mass occurrences of hexactinellids are also found in areas other than Antarctica. The phenomenon recognized in the Weddell Sea probably occurs more widely spread.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/00785326.1992.10430362
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    An improved supra- and epibenthic sledge for catching Peracarida (Crustacea, Malacostraca) (1995)
    Taylor & Francis
    In:  Ophelia, 43 (1). pp. 15-23.
    Details
    Publication Date: 2018-08-08
    Description: A new type of epibenthic sledge is presented, which possesses an additional supranet above the epinet. Both nets are closed by an opening/closing device in the water column. The new construction allows a selective catch ofhigher suprafauna, which swims 1–1.33m above the seafloor, and a good discrimination between real suprafauna and epifauna. In total, 79581 Peracarida were sampled at 8 stations at about 75°N and 12°W, off Greenland. Of these, Isopoda were usually the most abundant group in the epinet, Amphipoda in the supranet. At the stations where suprafauna was abundant, the numbers of Mysidacea were usually higher in the epinet than in the supranet, probably due to differences in food supply, i.e. the enrichment of food in the benthic boundary layer.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/00785326.1995.10430574
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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