TY  - JOUR
A1  - Pavesi, Laura
A1  - Ketmaier, Valerio
T1  - Patterns of genetics structuring and levels of differentiation in  supralittoral talitrid amphipods - an overview
JF  - Crustaceana : international journal of crustacean research
N2  - Talitrids are the only family within the order Amphipoda to have colonised supralittoral and terrestrial environments. They live in a variety of settings, from sandy to rocky and pebble beaches, to river and lake banks, and to leaf litter and caves. A common feature is the absence of a planktonic larval stage to facilitate passive dispersal over long-distances. However, some species have broad distributions. Genetic studies over the past 25 years have tried to explain this apparent contradiction by assessing patterns of species genetic structuring on different geographical scales. Here, we review the molecular studies available to date and focus on the population genetics of talitrids. Most of these studies considered populations in the Mediterranean area, but also along the Atlantic coast and in Canary Island caves. From this review, the group emerges as a potential model to understand processes of dispersal and divergence in non-highly-vagile supralittoral organisms. At the same time, studies on these issues are still too restricted geographically: a worldwide scale including different regions would provide us with a better perspective on these problems.
KW  - Supralittoral talitrids
KW  - dispersal
KW  - gene flow
KW  - allozymes
KW  - mitochondrial DNA
KW  - microsatellites
Y1  - 2013
U6  - https://doi.org/10.1163/15685403-00003212
SN  - 0011-216X
VL  - 86
IS  - 7-8
SP  - 890
EP  - 907
PB  - Brill
CY  - Leiden
ER  - 
TY  - JOUR
A1  - Pavesi, Laura
A1  - Tiedemann, Ralph
A1  - De Matthaeis, Elvira
A1  - Ketmaier, Valerio
T1  - Genetic connectivity between land and sea - the case of the beachflea Orchestia montagui (Crustacea, Amphipoda, Talitridae) in the Mediterranean Sea
JF  - Frontiers in zoology
N2  - Introduction: We examined patterns of genetic divergence in 26 Mediterranean populations of the semi-terrestrial beachflea Orchestia montagui using mitochondrial (cytochrome oxidase subunit I), microsatellite (eight loci) and allozymic data. The species typically forms large populations within heaps of dead seagrass leaves stranded on beaches at the waterfront. We adopted a hierarchical geographic sampling to unravel population structure in a species living at the sea-land transition and, hence, likely subjected to dramatically contrasting forces.
 Results: Mitochondrial DNA showed historical phylogeographic breaks among Adriatic, Ionian and the remaining basins (Tyrrhenian, Western and Eastern Mediterranean Sea) likely caused by the geological and climatic changes of the Pleistocene. Microsatellites (and to a lesser extent allozymes) detected a further subdivision between and within the Western Mediterranean and the Tyrrhenian Sea due to present-day processes. A pattern of isolation by distance was not detected in any of the analyzed data set.
 Conclusions: We conclude that the population structure of O. montagui is the result of the interplay of two contrasting forces that act on the species population genetic structure. On one hand, the species semi-terrestrial life style would tend to determine the onset of local differences. On the other hand, these differences are partially counter-balanced by passive movements of migrants via rafting on heaps of dead seagrass leaves across sites by sea surface currents. Approximate Bayesian Computations support dispersal at sea as prevalent over terrestrial regionalism.
KW  - Orchestia montagui
KW  - Talitrids
KW  - Mediterranean Sea
KW  - Phylogeography
KW  - Mitochondrial DNA
KW  - Microsatellites
KW  - Allozymes
KW  - Approximate Bayesian Computation
Y1  - 2013
U6  - https://doi.org/10.1186/1742-9994-10-21
SN  - 1742-9994
VL  - 10
IS  - 4-5
PB  - BioMed Central
CY  - London
ER  - 
TY  - JOUR
A1  - Pavesi, Laura
A1  - Tiedemann, Ralph
A1  - DeMatthaeis, Elvira
A1  - Ketmaier, Valerio
T1  - Genetic connectivity between land and sea: the case of the beachflea Orchestia montagui (Crustacea, Amphipoda, Talitridae) in the Mediterranean Sea
Y1  - 2013
UR  - 1960 = DOI: 10.1186/1742-9994-10-21
SN  - 1742-9994
ER  -