TY  - JOUR
A1  - Pavesi, Laura
A1  - Deidun, Alan
A1  - De Matthaeis, Elvira
A1  - Tiedemann, Ralph
A1  - Ketmaier, Valerio
T1  - Mitochondrial DNA and microsatellites reveal significant divergence in the beachflea Orchestia montagui (Talitridae: Amphipoda)
T2  - Aquatic sciences : research across boundaries
N2  - Talitrids are semiterrestrial crustacean amphipods inhabiting sandy and rocky beaches; they generally show limited active dispersal over long distances. In this study we assessed levels of population genetic structure and variability in the talitrid amphipod Orchestia montagui, a species strictly associated to stranded decaying heaps of the seagrass Posidonia oceanica. The study is based on six populations (153 individuals) and covers five basins of the Mediterranean Sea (Tyrrhenian, Ionian, Adriatic, Western and Eastern basins). Samples were screened for polymorphisms at a fragment of the mitochondrial DNA (mtDNA) coding for the cytochrome oxidase subunit I gene (COI; 571 base pairs) and at eight microsatellite loci. MtDNA revealed a relatively homogeneous haplogroup, which clustered together the populations from the Western, Tyrrhenian and Eastern basins, but not the populations from the Adriatic and Ionian ones; microsatellites detected two clusters, one including the Adriatic and Ionian populations, the second grouping all the others. We found a weak geographic pattern in the genetic structuring of the species, with a lack of isolation by distance at either class of markers. Results are discussed in terms of probability of passive dispersal over long distances through heaps of seagrass.
KW  - Orchestia montagui
KW  - mtDNA
KW  - Microsatellites
KW  - Mediterranean Sea
KW  - Spatial genetic variation
Y1  - 2012
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/35793
SN  - 1015-1621
VL  - 74
IS  - 3
SP  - 587
EP  - 596
PB  - Springer
CY  - Basel
ER  -