TY  - JOUR
A1  - Meyer, Jork
A1  - Kohnen, Annette
A1  - Durka, Walter
A1  - Wöstemeyer, Johannes
A1  - Blaum, Niels
A1  - Rossmanith, Eva
A1  - Brandl, Roland
T1  - Genetic structure and dispersal in a small South African Rodent : is dispersal female-biased?
N2  - Dispersal greatly determines genetic structure of populations, although it is influenced by landscape heterogeneity, quality of the matrix, resource distribution and local population densities and dynamics. To get insights into some of those processes we analysed the genetic structure of the hairy-footed gerbil Gerbillurus paeba (Rodentia, Murinae, Gerbillinae) in the southern Kalahari (South Africa). Samples were taken from 20 populations covering an area of about 2200 km2. Genetic data were related to landscape characters and population dynamics. We used newly developed microsatellites and found at all loci some indication for the presence of null alleles. However, null alleles seem to have little influence on the general results of our analyses. Altogether we found even nearby populations of G. paeba to be significantly differentiated, although assignment tests revealed 24% of individuals as immigrants. Genetic structure was independent of landscape heterogeneities at all spatial scales. Autocorrelation analyses (range 50-90 km) revealed significant genetic structure within populations on distances <3 km. We found some indication for female-biased dispersal. Our study suggests that dispersing individuals have little influence on the long-term genetic structure and that drift is the major cause of genetic diversity. The observed genetic pattern likely derives from strong population fluctuations of G. paeba. The landscape structure has little influence on the genetic differentiation between populations.
Y1  - 2009
UR  - http://www.sciencedirect.com/science/journal/16165047
U6  - https://doi.org/10.1016/j.mambio.2008.11.004
SN  - 1616-5047
ER  - 
TY  - JOUR
A1  - Meyer, Jork
A1  - Raudnitschka, Dorit
A1  - Steinhauser, J.
A1  - Jeltsch, Florian
A1  - Brandl, Roland
T1  - Biology and ecology of "Thallomys nigricauda" (Rodentia, Muridae) in the Thornveld savannah of South Africa
Y1  - 2008
UR  - http://www.sciencedirect.com/science/journal/16165047
U6  - https://doi.org/10.1016/j.mambio.2006.11.002
SN  - 1616-5047
ER  - 
TY  - CHAP
A1  - Rossmanith, Eva
A1  - Blaum, Niels
A1  - Keil, Manfred
A1  - Langerwisch, F.
A1  - Meyer, Jork
A1  - Popp, Alexander
A1  - Schmidt, Michael
A1  - Schultz, Christoph
A1  - Schwager, Monika
A1  - Vogel, Melanie
A1  - Wasiolka, Bernd
A1  - Jeltsch, Florian
T1  - Scaling up local population dynamics to regional scales
BT  - an integrated approach
N2  - In semi-arid savannas, unsustainable land use can lead to degradation of entire landscapes, e.g. in the form of shrub encroachment. This leads to habitat loss and is assumed to reduce species diversity. In BIOTA phase 1, we investigated the effects of land use on population dynamics on farm scale. In phase 2 we scale up to consider the whole regional landscape consisting of a diverse mosaic of farms with different historic and present land use intensities. This mosaic creates a heterogeneous, dynamic pattern of structural diversity at a large spatial scale. Understanding how the region-wide dynamic land use pattern affects the abundance of animal and plant species requires the integration of processes on large as well as on small spatial scales. In our multidisciplinary approach, we integrate information from remote sensing, genetic and ecological field studies as well as small scale process models in a dynamic region-wide simulation tool.  <hr>  Interdisziplinäres Zentrum für Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006.
Y1  - 2006
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7320
N1  - [Poster]
ER  -