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Article
What goes down must come up: symmetry in light-induced migration behaviour of Daphnia
During a short period of the year, Daphnia may perform a phenotypically induced diel vertical migration. For this to happen, light-induced swimming reactions must be enhanced both at dawn and at dusk. Enhanced sw...
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Article
On the combined analysis of proximate and ultimate aspects in diel vertical migration (DVM) research
Although evolutionary ecologists agree that proximate and ultimate aspects are two sides of one coin, they are seldom interested in studies on physiological and behavioural mechanisms at the base of ecological...
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Article
Some suggestions for future cladoceran research
The topics dealt with at the Cladoceran Symposium showed a largediversity. A high diversity is what characterises the world westudy, consisting of many different habitats and a rich speciesset. This easily lea...
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Article
Differential behaviour and shifts in genotype composition during the beginning of a seasonal period of diel vertical migration
During the first few weeks of a recurring seasonalperiod of diel vertical migration in Lake Maarsseveen(The Netherlands), part of the hybrid Daphniagaleata × hyalina population migrated, whileanother part rema...
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Article
The influence of a fish exudate on two clones of the hybrid Daphnia galeata × hyalina
Two Daphnia clones were isolated from different day depths during the period of diel vertical migration and were tested for their life-history responses to a fish exudate released by juvenile perch. Animals were ...
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Chapter and Conference Paper
The influence of a fish exudate on two clones of the hybrid Daphnia galeata × hyalina
Two Daphnia clones were isolated from different day depths during the period of diel vertical migration and were tested for their life-history responses to a fish exudate released by juvenile perch. Animals were ...
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Article
Sikko Parma: limnologist, environmentalist and scientific manager