Extreme helmet formation in Daphnia cucullata induced by small-scale turbulence.

Laforsch, Christian and Tollrian, Ralph (2004) Extreme helmet formation in Daphnia cucullata induced by small-scale turbulence. Journal of Plankton Research, 26 (1). pp. 81-87. ISSN 1464-3774

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Although Daphnia cucullata is used as a textbook example for cyclomorphosis, distinct helmet development, as shown in the field, has not been demonstrated in the laboratory until now. We show for the first time that small-scale turbulence is able to induce the maximum response of morphological plasticity in D. cucullata. Helmet elongation reached magnitudes as extreme as observed in the field. Different modes of generating small-scale turbulence caused different levels of helmet formation. Small-scale turbulence alone may not be responsible for cyclomorphosis in nature because field data show that two nearby lakes with similar morphometry differ in cyclomorphosis patterns, while laboratory experiments show that there is no difference in the ability to form helmets in the clones of each lake. Although helmet formation in D. cucullata is inducible with predator kairomones, helmet elongation is not as strong as that induced by turbulence. We discuss the possible role of helmets under turbulent conditions.

Item Type: Journal Article
Journal or Publication Title: Journal of Plankton Research
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/qh301
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 10672
Deposited By: Mr Richard Ingham
Deposited On: 22 Jul 2008 10:39
Refereed?: Yes
Published?: Published
Last Modified: 01 Jan 2020 06:00
URI: https://eprints.lancs.ac.uk/id/eprint/10672

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