Naslov
Phylogeography of caddisflies : identification of the processes underlying high diversity and endemism in the Balkans

Autori
Previsić, Ana ; Walton, Catherine ; Kučinić, Mladen ; Mitrikeski, Petar ; Kerovec, Mladen

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
41st Population Genetics Group Meeting : abstracts / - , 2007, 28-28

Skup
Population Genetics Group Meeting (41 ; 2007)

Mjesto i datum
Warwick, Ujedinjeno Kraljevstvo, 17.12.2007. - 20.12.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
caddisflies

Sažetak
The impact of Pleistocene climatic changes on the biogeography of European freshwater fauna is still far less understood than in the case of terrestrial taxa. Similarly, the processes underlying biodiversity and speciation in refugial regions, especially the Balkans, seem to be more complex than originally recognized yet little studied. The Pleistocene is generally regarded as a time of very little diversification at the species level, although some recent studies have demonstrated a Pleistocene origin for some taxa. The Dinaric area is recognized as a European biodiversity hotspot and renowned for its high endemism. We performed phylogenetic and population genetic analyses on mitochondrial DNA sequences (COI and 16S) of several range-restricted Dinaric caddisfly endemics (Drusus, Limnephilidae, Trichoptera) in order to test the hypothesis that Pleistocene glaciations have promoted speciation and diversity in a refugial area. The divergence of five endemic Bosnian species and 11 populations of a Croatian taxon date to well within the Pleistocene period (1.25-0.43 Mya). Spatial analysis of molecular variance and nested clade analysis of the Croatian populations revealed very restricted gene flow on a small spatial scale and allopatric fragmentation. Given their limited dispersal ability, specific habitat requirements and life history traits, the present distribution of these species/populations in isolated sky islands likely represents the situation typical for interglacial phases. Dispersal is probably limited largely to glacial periods when the species descend in altitude to track suitable environmental conditions. Overall, the results suggest that the divergence of populations and formation of endemic species was promoted by allopatric fragmentation during interglacial periods, emphasising the importance of Pleistocene cyclic climatic change in generating diversity and endemism in refugial regions.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA