Asexuality and polyploidy in Daphnia from the tropical Andes

X. Aguilera, J. Mergeay, A. Wollebrants, S. Declerck, Luc De Meester

Research output: Contribution to journal/periodicalArticleScientificpeer-review

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 gradient.
Original languageEnglish
Pages (from-to)2079-2088
Number of pages10
JournalLimnology and Oceanography
Volume52
Issue number5
DOIs
Publication statusPublished - 2007
Externally publishedYes

Keywords

  • obligate parthenogenesis sexual reproduction clonal diversity species complex pulex group populations insights history distributions hybridization Marine & Freshwater Biology Oceanography

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