Title: Asexuality and polyploidy in Daphnia from the tropical Andes
Authors: Aguilera, Ximena
Mergeay, Joachim ×
Wollebrants, An
Declerck, Steven
De Meester, Luc #
Issue Date: Sep-2007
Publisher: American Society of Limnology and Oceanography
Series Title: Limnology and Oceanography vol:52 issue:5 pages:2079-2088
Abstract: We assessed genetic variation at microsatellite loci within and among populations of the planktonic crustacean
Daphnia pulex in 12 Bolivian Andean lakes, located above 4,000 m above sea level. Genetic analyses show that all
populations consisted of obligately asexual lineages, a fact that was confirmed by observations from laboratory
cultures. Moreover, microsatellite phenotypes indicate that these tropical lineages are polyploid. Levels of genetic
diversity were comparable to those found in polyploid Daphnia from arctic regions, indicating a local origin rather
than an accidental colonization from arctic regions. This is the first record of polyploid cladocerans in a tropical
region. We suggest that their origination and abundance have probably been facilitated by the extreme
environmental conditions in Andean lakes. Our analysis of multilocus genotype frequencies in relation to
variation in environmental conditions indicates lineage sorting along a food availability and fish predation
ISSN: 0024-3590
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Aquatic Ecology and Evolutionary Biology (-)
Ecology, Evolution and Biodiversity Conservation Section
× corresponding author
# (joint) last author

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