Document Detail

Resurrected Ceriodaphnia quadrangula highlight differences between pheno- and genotypic expressions.
MedLine Citation:
PMID:  23301166     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The hatching of cladoceran ephippia from a 15-cm long sediment core was investigated, and Ceriodaphnia quadrangula clones were isolated from different sediment layers. Bosmina microfossil data were also analyzed, and compared with the corresponding data from a Pb210 dated core, which allowed us to infer the age of the sediment layers. Using changes in Bosmina microfossil morphologies, we were, furthermore, able to infer the presence of different regimes of fish predation. C. quadrangula was found to hatch in layers with an inferred age of approximately a century. Newly hatched individuals had smaller eye-size in sediment layers corresponding to high predation by young-of-the-year perch. Newly hatched individuals also generally had a marked neck-spine. In contrast, morphological characters of C. quadrangula clones reared in the laboratory over several generations showed no variation in relation to predation regime, indicating the absence of fixed genotype level changes. Furthermore, the laboratory grown clones only rarely produced a neck-spine. The results suggest phenotypic variation in response to the regime under which ephippia were produced.
Marko Reinikainen; Emma Ahlén
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Publication Detail:
Type:  Journal Article     Date:  2012-11-02
Journal Detail:
Title:  Ecology and evolution     Volume:  2     ISSN:  2045-7758     ISO Abbreviation:  Ecol Evol     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-01-09     Completed Date:  2013-01-10     Revised Date:  2013-05-30    
Medline Journal Info:
Nlm Unique ID:  101566408     Medline TA:  Ecol Evol     Country:  England    
Other Details:
Languages:  eng     Pagination:  2989-98     Citation Subset:  -    
Tvärminne Zoological Station J.A. Palménin tie 260, FI-10900, Hanko, Finland ; Department of Ecology and Environmental Science, Umeå University SE-901 87, Umeå, Sweden.
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