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- Title
Proximate factors controlling the morphologic plasticity of Bosmina: linking artificial laboratory treatments and natural conditions.
- Authors
Sakamoto, Masaki; Hanazato, Takayuki
- Abstract
Recent studies have shown that some biotic/abiotic signals such as predator-mediated chemical/physical cues and disparate water temperature are important factors for the induction of anti-predator morphs in cladocerans. As much of the evidence has come from laboratory studies, it is important to investigate the extent to which these studies reproduce the real cyclomorphic conditions occurring in nature. The present study was planned to compare the differences in the potential intensity of cyclomorphogenic factors in the laboratory and in nature. For this, we conducted two experiments in the laboratory and the field at the same time using the small cladoceran Bosmina longirostris and a predacious copepod. The results of the present experiments suggested that an abiotic factor, lower temperature acted as a key factor enhancing the changes in both the length and shape of antennules in Bosmina, which had been governed by different signals from predators. The lower temperature can be effective in helping prey bosminids to detect a severe predation threat by cyclopoid copepods, since that condition is a feature of spring and fall, a time when copepods are abundant.
- Subjects
PHENOTYPIC plasticity; CYCLOMORPHOSIS; CLADOCERA; COPEPODA; PREDATORY animals; ANIMAL defenses; RESEARCH methodology; COMPARATIVE studies; FACTOR analysis; PHYSIOLOGY
- Publication
Hydrobiologia, 2009, Vol 617, Issue 1, p171
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-008-9544-4