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Halomonhystera disjuncta – a young-carrying nematode first observed for the Baltic Sea in deep basins within chemical munitions disposal sites
Grzelak, K.; Kotwicki, L. (2016). Halomonhystera disjuncta – a young-carrying nematode first observed for the Baltic Sea in deep basins within chemical munitions disposal sites. Deep-Sea Res., Part II, Top. Stud. Oceanogr. 128: 131-135. https://dx.doi.org/10.1016/j.dsr2.2014.12.007
In: Deep-Sea Research, Part II. Topical Studies in Oceanography. Pergamon: Oxford. ISSN 0967-0645; e-ISSN 1879-0100, more
Peer reviewed article  

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Keywords
    Halomonhystera disjuncta (Bastian, 1865) Andrássy, 2006 [WoRMS]; Nematoda [WoRMS]
    Marine/Coastal
Author keywords
    Meiofauna; Nematodes; Halomonhystera disjuncta; Ovoviviparity; Disturbed environment

Authors  Top 
  • Grzelak, K.
  • Kotwicki, L., more

Abstract
    Three deep basins in the Baltic Sea were investigated within the framework of the CHEMSEA project (Chemical Munitions Search & Assessment), which aims to evaluate the ecological impact of chemical warfare agents dumped after World War II. Nematode communities, which comprise the most numerous and diverse organisms in the surveyed areas, were investigated as a key group of benthic fauna. One of the most successful nematode species was morphologically identified as Halomonhystera disjuncta (Bastian, 1865). The presence of this species, which is an active coloniser that is highly resistant to disturbed environments, may indicate that the sediments of these disposal sites are characterised by toxic conditions that are unfavourable for other metazoans. Moreover, ovoviviparous reproductive behaviour in which parents carry their brood internally, which is an important adaptation to harsh environmental conditions, was observed for specimens from Gdansk Deep and Gotland Deep. This reproductive strategy, which is uncommon for marine nematodes, has not previously been reported for nematodes from the Baltic Sea sediment.

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