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Artendiversität der Vegetation von Roteichenbeständen in der Niederlausitzer Bergbaufolgelandschaft
(2002)
In June 2009 a badger carcass was exposed on the former Soviet military training area of Lieberose in Brandenburg, Germany. Two months later, soil samples were taken on the former carcass site by a cross-shaped sampling design including 61 samples. Parameters tested were pH, water content, organic matter content, NO3–, NH4+, PO43– and conductivity. During a second sampling campaign in June 2010, the same parameters were tested again as well as collembolans. One year after decomposition, NO3– and PO43– was still significantly increased, whereas NH4+, conductivity and water showed a significant increase only in the first sampling campaign. Organic matter content and pH showed no significant changes. 7,606 collembolan individuals belonging to 13 species were extracted. 94.6% were.
Background Open cast lignite mines, sand pits and military training areas represent human-made, secondary habitats for specialized xerothermophilous and psammophilous species. Rare species, including the earwig Labidura riparia, are found in high population densities in such sites. However, it is unknown from which sources colonisation took place and how genetic variation compares to that of ancient populations on natural sites. Methods Using nine microsatellite markers, we analysed genetic variation and population structure of L. riparia in 21 populations in NE Germany both from secondary habitats such as lignite-mining sites, military training areas and a potassium
mining heap, and rare primary habitats, such as coastal and inland dunes. Results Genetic variation was higher in populations from post-mining sites and former military training areas than in populations from coastal or inland dune sites. Overall population diferentiation was substantial (FST=0.08; FʹST=0.253), with stronger diferentiation among primary (FST=0.196; FʹST=0.473) than among secondary habitats (FST=0.043; FʹST=0.147). Diferentiation followed a pattern of isolation by distance. Bayesian structure analysis revealed three gene pools representing primary habitats on a coastal dune and two diferent inland dunes. All populations from secondary habitats were mixtures
of the two inland dune gene pools, suggesting multiple colonization of post-mining areas from diferent source populations and hybridisation among source populations. Discussion Populations of L. riparia from primary habitats deserve special conservation, because they harbour diferentiated gene pools. The majority of the L. riparia populations, however, thrive in secondary habitats, highlighting their role for conservation. Implications for insect conservation A dual strategy should be followed of conserving both remaining natural habitat harbouring particular intraspecifc gene pools and secondary habitat inhabited by large admixed and genetically highly variable
populations.
Freie Sukzession
(2002)
Recultivation of post mining areas with Quercus rubra - the succession of ground beetle communities
(2003)
Analysis of landscape structure in former military training areas using remote sensing and GIS
(2003)
Die neue Haftung für Schäden an der Biodiversität - zum Tatbestand der erheblichen Auswirkungen
(2008)
Akteure in der Renaturierung
(2009)
Was sollten wir über Biodiversität wissen? Perspektiven einer angewandten Biodiversitätsforschung
(2003)