Intraspecific spatial genetic differentiation of a Daphnia species within a long narrow reservoir

0394903 - BC 2014 RIV NL eng J - Článek v odborném periodiku
Petrusek, A. - Seďa, Jaromír - Macháček, Jiří - Říha, Milan - Prchalová, Marie - Schwenk, K.
Intraspecific spatial genetic differentiation of a Daphnia species within a long narrow reservoir.
Hydrobiologia. Roč. 715, č. 1 (2013), s. 169-180. ISSN 0018-8158. E-ISSN 1573-5117.
[International Symposium on Cladocera /9./. Verbania-Palanza, 02.10.2011-08.10.2011]
Grant CEP: GA AV ČR(CZ) IAA600960901; GA ČR(CZ) GA206/04/0190
Institucionální podpora: RVO:60077344
Klíčová slova: environmental gradients * spatial distribution * interspecific hybridization
Kód oboru RIV: DA - Hydrologie a limnologie
Impakt faktor: 2.212, rok: 2013

Environmental gradients influence the distribution and taxonomic composition of planktonic taxa, including Daphnia. In canyon-shaped reservoirs with pronounced horizontal gradients of food supply, predation pressure and other factors, not only species and interspecific hybrids but also clones within these taxa are non-randomly distributed. Using a long-term data set from a reservoir mostly dominated by a single Daphnia species, we evaluated whether intraspecific genetic differentiation can be frequently detected between upstream and downstream reservoir regions with different environmental conditions. We analysed variation at four allozyme loci (two species-specific and two polymorphic) to assess the taxonomic composition and intraspecific variation of Daphnia collected in different years (between 1995 and 2005) and periods of the growing season. D. galeata dominated in all samples, although other species and hybrids with D. galeata were also occasionally detected. Despite limited variation at the analysed loci, D. galeata from upstream and downstream regions were significantly genetically differentiated on seven out of twelve sampling dates. Although genetic drift in geographically distant subpopulations may contribute to differentiation, we presume that the observed patterns are primarily due to different selection regimes. We predict that a significant genetic differentiation within planktonic populations also occurs more frequently in natural water bodies.
Trvalý link: http://hdl.handle.net/11104/0223063