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- Schander, C, 1960, et al.
(author)
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The fauna of hydrothermal vents on the Mohn Ridge (North Atlantic)
- 2010
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In: Marine Biology Research. - 1745-1000. ; 6:2, s. 155-171
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Journal article (peer-reviewed)abstract
- The macrofauna of the newly discovered hydrothermal vent field on the Mohn Ridge at 71 degrees N was investigated. Samples were collected during the cruise BIODEEP 2006 using the ROV 'Bathysaurus'. A total of 180 species-level taxa were identified. The region contains very few vent-endemic species, but some species of Porifera, Crustacea and Mollusca may be vent-associated. Dense aggregations of motile non-vent species such as Heliometra glacialis and Gorgonocephalus eucnemis surrounded the vent area, but the area in general only held small numbers of sedentary animals. Calcareous sponges comprised an unusually high portion of the sponge species found and they constitute one of the first pioneers among the sessile invertebrates settling on these vents. Possible explanations for the structure of the fauna in the region are discussed.
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| 2. |
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| 3. |
- Risgaard-Petersen, N., et al.
(author)
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Evidence for complete denitrification in a benthic foraminifer
- 2006
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In: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 443:7107, s. 93-96
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Journal article (peer-reviewed)abstract
- Benthic foraminifera are unicellular eukaryotes found abundantly in many types of marine sediments. Many species survive and possibly reproduce in anoxic habitats(1), but sustainable anaerobic metabolism has not been previously described. Here we demonstrate that the foraminifer Globobulimina pseudospinescens accumulates intracellular nitrate stores and that these can be respired to dinitrogen gas. The amounts of nitrate detected are estimated to be sufficient to support respiration for over a month. In a Swedish fjord sediment where G. pseudospinescens is the dominant foraminifer, the intracellular nitrate pool in this species accounted for 20% of the large, cell-bound, nitrate pool present in an oxygen-free zone. Similarly high nitrate concentrations were also detected in foraminifera Nonionella cf. stella and a Stainforthia species, the two dominant benthic taxa occurring within the oxygen minimum zone of the continental shelf off Chile. Given the high abundance of foraminifera in anoxic marine environments(1-3), these new findings suggest that foraminifera may play an important role in global nitrogen cycling and indicate that our understanding of the complexity of the marine nitrogen cycle is far from complete.
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| 4. |
- Souter, Petra B., et al.
(author)
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Spatial distribution of the large foraminiferan Discobotellina biperforata, off the west shore of Moreton Island, Queensland, Australia
- 2002
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In: Journal of Foraminiferal Research. - : GeoScienceWorld. - 0096-1191 .- 1943-264X. ; 32:4, s. 448-452
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Journal article (peer-reviewed)abstract
- A hierarchical sampling study of the distribution of the large foraminiferan Discobotellina biperforata (Collins, 1958) was conducted along the west shore of Moreton Island, at Shark Spit and Tangalooma, in Moreton Bay, Queensland, between March and June 1995. D. biperforata is disc-shaped, with a test made up of organic matter, reinforced with sand grains. The species exhibits different test morphologies, the most abundant type being the biperforate which has two holes, or lunules, through its test. A less common type is the non-lunulate form, and the multiperforate and crescent-shaped types are rare. Possible abundance-substratum correlations were studied and the results indicated that D. biperforata is strongly correlated to a band of siltier and more organic-rich sediment found at the bottom of sand slopes running off Moreton Island. There was a significant difference in abundance between Tangalooma, where the mean abundance was 11.11 individuals per square meter (SD = 3.63) and Shark Spit, where it was found to be 7.73 individuals per square meter (SD = 3.06). No patchiness was apparent within the areas of siltier and organic-rich sediments. There was no significant difference in the ratio between the different forms within the areas sampled, but a size difference was apparent between locations, with larger specimens found at Tangalooma. The mean size of the specimens found was 27.7 mm in diameter. D. biperforata is the most abundant macrofaunal species in the area studied.
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