Abstract
Two new forms of the copepod genus Tisbe, one of which was found in the Lagoon of Venice near Chioggia (Italy), and the other in the port of Malta, have been studied. Although showing a striking resemblance in morphology, all attempts to cross representatives of the 2 populations have failed. They may, therefore, be considered as “sibling species”. Even on closer study, no qualitative structural differences between them were found. However, careful analysis of some biometrical traits revealed significant differences. A certain differentiation of another kind emerges from the comparison of the life-cycle and population dynamics. Under standard laboratory conditions the following main parameters have been considered: (1) survival; (2) mean and minimum generation time, T; (3) net reproduction rate, R 0; (4) intrinsic rate of natural increase, r m. The significance of the findings is discussed.
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Communicated by B. Battaglia, Padua
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Volkmann-Rocco, B., Fava, G. Two sibling species of Tisbe (Copepoda, Harpacticoida): Tisbe reluctans and T. persimilis n. sp. Research on their morphology and population dynamics. Marine Biology 3, 159–164 (1969). https://doi.org/10.1007/BF00353436
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DOI: https://doi.org/10.1007/BF00353436