ISSN:
1573-5117
Schlagwort(e):
Daphnia galeata mendotae
;
Daphnidae
;
Cladocera
;
Crustacea
;
cyclomorphosis
;
phenotypic variability
;
stability
;
temperate lake
;
coefficient of variation
;
invertebrate predation
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Abstract Phenotypic change is studied in a cyclomorphicDaphnia galeata mendotae population known from previous studies to be clonally diverse. Morphological analyses revealed cyclical changes in both adult and juvenile helmet length and tailspine length which were: 1) strongly correlated with mean water temperature; and 2) repeated annually during the 3-year study period. Field populations exhibited high (5% to 30%) coefficients of variation (CV) for both helmet length and tailspine length; the CV also exhibited seasonal fluctuations such that it was lowest in late summer. The period of highestDaphnia helmet development coincides with peak densities of the common invertebrate predatorsChaoborus andLeptodora. The fluctuations in CV may be due to both differential phenotypic expression of the coexisting clones and invertebrate predation.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00008176
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