, Volume 726, Issue 1, pp 1–11 | Cite as

Seasonal migration of a glacial relict mysid (Crustacea) into the littoral zone and its co-occurrence with an introduced competitor in Lough Derg (Ireland)

  • Marcin R. Penk
  • Dan Minchin
Primary Research Paper


Temporal migrations by aquatic organisms have important implications for fundamental ecosystem processes and community interactions. Mysid crustaceans, key planktivores and fish prey in aquatic food webs, frequently undertake diurnal vertical migrations, but there are limited reports of horizontal movements. Using seasonal and diurnal field surveys in Lough Derg on the Shannon River (Ireland), we tested the hypotheses that (i) the euryhaline mysid Mysis salemaai expands seasonally its horizontal distribution and that (ii) the diurnal pattern of vertical migration within the shallows overlaps with the introduced mysid Hemimysis anomala. M. salemaai, previously considered an exclusively offshore species, changed its horizontal distribution significantly with seasons, being restricted to ≥8 m in summer and extending to all depths in winter. During winter, the distribution of M. salemaai overlapped with H. anomala in shallows and there was a highly significant overlap in their diurnal emergence in the open water, indicating a strong temporal synchrony of planktonic foraging. The seasonal range expansion of M. salemaai is likely to have important implications for horizontal redistribution of nutrients. Interactions with the sympatric H. anomala are likely, adding to existing physico-chemical pressures on the glacial relict M. salemaai and potentially contributing to its further extirpations.


Mysis salemaai Temporal migration Hemimysis anomala Distribution overlap Lake 



Authors would like to acknowledge Kevin Gallagher and Áine Murphy for contributing distribution records, Magda Gluza, Danny O’Neill and Mark Emmerson for assistance in the field, Deirdre McClean and Adam Kane for useful discussions and John Brophy for help with the manuscript. Part of this work was funded by the Irish Research Council and Ecoserve Ltd.


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.School of Natural SciencesTrinity College DublinDublinIreland
  2. 2.The Coastal Research and Planning InstituteKlaipeda UniversityKlaipedaLithuania
  3. 3.Lough Derg Science GroupBallina, Killaloe, Co. ClareIreland

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