Based on visual observations in the Nyegga (Norwegian Sea) methane seep area we defined arbitrary boundaries and defined the following types of microbiotopes: the siboglinid field, bacterial mat, and background sediment. The metazoan meiobenthos consisted of 14 major taxa; the Nematoda dominated at seven of the eight stations. The taxonomic diversity of metazoan meiobenthos in the siboglinid fields was higher than that in the background bottom area. The average population density in siboglinid microbiotope exceeded the abundance of organisms in the background sediments by 1.3 times. The nematode population and total meiobenthos varied in bacterial maths. The modal size fraction of meiobenthos and nematodes regardless of microbiotopes fell on samples that were obtained on sieves with 63–125 μm mesh sizes. In total, 88 nematod species belonging to 26 families and 63 genera were recorded. The species diversity decreased in the direction from the background biotope to siboglinid fields and further to bacterial mats.
Russian Journal of Marine Biology – Springer Journals
Published: Aug 30, 2014
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