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Competition between the sibling species Tisbe holothuriae and T. battagliai (Harpacticoida)
Bergmans, M.; Janssens, P.P.M. (1988). Competition between the sibling species Tisbe holothuriae and T. battagliai (Harpacticoida), in: (1989). IZWO Coll. Rep. 19(1989). IZWO Collected Reprints, 19: pp. chapter 1
In: (1989). IZWO Coll. Rep. 19(1989). IZWO Collected Reprints, 19[s.n.][s.l.], more
In: IZWO Collected Reprints. Instituut voor Zeewetenschappelijk Onderzoek: Bredene. ISSN 0772-1250, more

Also published as
  • Bergmans, M.; Janssens, P.P.M. (1988). Competition between the sibling species Tisbe holothuriae and T. battagliai (Harpacticoida). Hydrobiologia 167-168: 455-462, more

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Keywords
    Competition; Growth; Marine crustaceans; Phenology; Salinity; Sexual reproduction; Sibling species; Harpacticoida [WoRMS]; Tisbe battagliai Volkmann-Rocco, 1972 [WoRMS]; Tisbe holothuriae Humes, 1957 [WoRMS]; Marine

Authors  Top 
  • Bergmans, M., more
  • Janssens, P.P.M.

Abstract
    The influence of the 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 pro mille for over 175 generations. Cohort studies show that T. holothuriae has higher growth rates (R0 and r) at 32 pro mille, T. battagliai at 20 pro mille. 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 pro mille but the two species are competitively almost equal at 20 pro mille. The two species co-occur in situ during autumn, but their differential predominance at different sites is not explained by the effect of salinity.

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