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Free-living interstitial Plathelminthes of the Baltic sea: diversity and abundance

Urban-Malinga B.

Polish Journal of Ecology

2011

Vol. 59, nr 3

623-630

Free-living Plathelminthes constitute an important component of meiobenthic communities in various marine benthic environments, but research focusing on this group is generally scarce. The current study investigated the free-living interstitial flatworms of the shallow sandy sublittoral zone of the southern Baltic coast. Sediment samples were taken at Hel Peninsula at water depths of 1.5 m and 7 m, and the plathelminths were identified alive to the species level. In total, 22 species were identified. The majority of the species belonged to Kalyptorhynchia and Proseriata, but Acoela recently moved from Plathelminthes into their own phyllum and represented by Mecynostomidae, was the most numerous group. The average total plathelminth densities ranged between 6 and 74 ind. 10 cm[^-2]. The vertical distribution of the plathelminth fauna in the sediments was usually limited to the upper 3-4 cm, except for acoels which penetrated deeper into the sediment layers. The role of both sediment water saturation and oxygen availability appeared to be the main factors limiting flatworm occurrence in the sediments investigated in this study.