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JOURNAL OF PLANKTON RESEARCH | VOLUME 9 | NUMBER 2 | PAGES 297-304 | 1987
© Oxford University Press

research-article

A morphological study of two populations of Bosmina longispina exposed to different predation

Geir Helge Johnsen and Gunnar Gihle Raddum

Department of Animal Ecology, Museum of Zoology, University of Bergen 5000 Bergen, Norway

Received on October 1, 1985; accepted on October 1, 1986 Two populations of Bosmina longispina existing in two similar and closely situated Norwegian mountain lakes were investigated with respect to morphological variations. The two lakes are inhabited by different predators, Lake Gopollen is dominated by whitefish and Lake Djupen by a sparse population of brown trout and invertebrate predators. The B. longispina in Lake Djupen were both larger and also longer at maturation than the B. longispina of Lake Gopollen. In Lake Djupen the mucrones of B. longispina were twice as long and their relative antennula length was also larger than in Lake Gopollen. However, the relative eye size did not differ between the two populations. The observations fit the present hypothesis on morphological predator avoidance adaptations in B. longispina, fairly well. Invertebrate predators favour large B. longispina with long protuberances, body size and length of mucro being the most important features.


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Home page
 J PLANKTON RESHome page
K. H. Chang and T. Hanazato
Seasonal and reciprocal succession and cyclomorphosis of two Bosmina species (Cladocera, Crustacea) co-existing in a lake: their relationship with invertebrate predators
J. Plankton Res., February 1, 2003; 25(2): 141 - 150.
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