Abstract
The influence of salinity on the performance of the sibling species Tisbe holothuriae and T. battagliai in pure and mixed cultures was studied, using laboratory stocks adapted to 32‰ for over 175 generations. Cohort studies show that T. holothuriae has higher growth rates (Ro and r) at 32‰, T. battagliai at 20‰. The latter’s life cycle is much less affected by the difference in salinity. ‘De Wit’ replacement series were used to study competitive interactions. Without water renewal, T. holothuriae eliminates its sibling species in less than 2 generations, apparently through chemical interference. With water renewal, i.e. when exploitation competition becomes relatively more important, T. holothuriae still proves superior at 27‰ but the two species are compctitively almost equal at 20‰. The two species cooccur in situ during autumn, but their differential predominance at different sites is not explained by the effect of salinity.
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Bergmans, M., Janssens, P.P.M. (1988). Competition between the sibling species Tisbe holothuriae and T. battagliai (Harpacticoida). In: Boxshall, G.A., Schminke, H.K. (eds) Biology of Copepods. Developments in Hydrobiology, vol 47. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3103-9_51
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DOI: https://doi.org/10.1007/978-94-009-3103-9_51
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