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Colonization of macroalgal deposits by estuarine nematodes through air and potential for rafting inside algal structures
Buys, B.; Derycke, S.; De Meester, N.; Moens, T. (2021). Colonization of macroalgal deposits by estuarine nematodes through air and potential for rafting inside algal structures. PLoS One 16(4): e0246723. https://hdl.handle.net/10.1371/journal.pone.0246723
In: PLoS One. Public Library of Science: San Francisco. ISSN 1932-6203; e-ISSN 1932-6203
Peer reviewed article  

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Keyword
    Marine/Coastal

Authors  Top 
  • Buys, B.
  • Derycke, S., more
  • De Meester, N.
  • Moens, T., more

Abstract
    Dispersal is an important life-history trait. In marine meiofauna, and particularly in nematodes, dispersal is generally considered to be mainly passive, i.e. through transport with water currents and bedload transport. Because nematodes have no larval dispersal stage and have a poor swimming ability, their per capita dispersal capacity is expected to be limited. Nevertheless, many marine nematode genera and even species have near-cosmopolitan distributions, and at much smaller spatial scales, can rapidly colonise new habitat patches. Here we demonstrate that certain marine nematodes, like the morphospecies Litoditis marina, can live inside macroalgal structures such as receptacula and–to a lesser extent–floating bladders, which may allow them to raft over large distances with drifting macroalgae. We also demonstrate for the first time that these nematodes can colonize new habitat patches, such as newly deposited macroalgal wrack in the intertidal, not only through seawater but also through air. Our experimental set-up demonstrates that this aerial transport is probably the result of hitchhiking on vectors such as insects, which visit, and move between, the patches of deposited algae. Transport by wind, which has been observed for terrestrial nematodes and freshwater zooplankton, could not be demonstrated. These results can be important for our understanding of both large-scale geographic distribution patterns and of the small-scale colonization dynamics of habitat patches by marine nematodes.

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