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

100%

Urban-Malinga B.

Polish Journal of Ecology

2011

tom 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.

Gwizdek (?) z poroża z Wyspy Sobieszewskiej w Gdańsku

67%

Kurzyk K. , Litwinienko A.

Pomorania Antiqua

2022

tom Tom XXXI

189–199

In May 2020, Ms Sylwia Ziółkowska donated to the collection of the National Maritime Museum in Gdańsk an artefact made of antler, which she accidentally discovered while walking on the beach of Wyspa Sobieszewska in Gdańsk (Fig. 1). The artefact probably originally served as a whistle. Dimensions: maximum length 24 cm, maximum diameter at the mouthpiece 2.8 cm, diameter of the inner hole 1.2 cm (Figs. 2-3). After calibration, the radiocarbon dating with a probability of 95.4% is at the maximum in the period 172 BC to 8 AD (Fig. 4), i.e. in the younger Pre-Roman period in Poland. The simple form of the artefact is intercultural, and we know similar finds also from other periods and archaeological cultures, e.g. from Denmark, Germany, Austria, the Czech Republic, Romania, Spain and Portugal (Fig. 5). Some researchers criticized the hypotheses about the acoustic purpose of the discussed subjects. Among alternative interpretations, there were often proposals to consider them as basketry tools or, in the case of smaller specimens, as pendants and amulets. Among the alternative interpretations in the literature, there are ones ascribing to the discussed items the role of elements of the horse harness (side pieces). The artefact discovered on Wyspa Sobieszewska in Gdańsk has morphological features typical of stopped edge-blown aerophones. However, the plug closing the blow hole has not survived. Undoubtedly, the collection of these extremely interesting artefacts requires a broader view and further analysis, especially attempts to reconstruct the sound.