@misc{NeyeWallschlaegerTiedemann2006, author = {Neye, Gundula and Wallschl{\"a}ger, Hans-Dieter and Tiedemann, Ralph}, title = {Song dialect boundaries in the Yellowhammer: Do they restrict gene flow?}, series = {Journal of ornithology}, volume = {147}, journal = {Journal of ornithology}, number = {Supplement 1}, publisher = {Blackwell}, address = {New York}, issn = {0021-8375}, pages = {219 -- 219}, year = {2006}, language = {en} } @misc{TiedemannPfautsch2006, author = {Tiedemann, Ralph and Pfautsch, Simone}, title = {MHC evolution in ducks and allies}, series = {Journal of ornithology}, volume = {147}, journal = {Journal of ornithology}, number = {Supplement 1}, publisher = {Blackwell}, address = {New York}, issn = {0021-8375}, pages = {48 -- 48}, year = {2006}, language = {en} } @article{StuckasTiedemann2006, author = {Stuckas, H and Tiedemann, Ralph}, title = {Eight new microsatellite loci for the critically endangered fire-bellied toad Bombina bombina and their cross- species applicability among anurans}, doi = {10.1111/j.1471-8286.2005.01171.x}, year = {2006}, abstract = {We describe eight new microsatellite loci for the critically endangered fire-bellied toad, Bombina bombina. Seven of them are polymorphic with two to seven alleles per locus, an expected heterozygosity between 0.41 and 0.8, and an observed heterozygosity between 0.27 and 0.7. The yield of new loci was relatively low, presumably due to mildly repetitive sequence motifs in microsatellite flanking regions. As typical for anurans, cross-species amplification was limited (here, to congeners Bombina orientalis and Bombina variegata). Combining these new loci with those already available provides a reasonable number of loci for population studies and pedigree analysis in Bombina}, language = {en} } @article{WronskiTiedemannApioetal.2006, author = {Wronski, Torsten and Tiedemann, Ralph and Apio, Ann and Plath, Martin}, title = {Cover, food, competitors and individual densities within bushbuck Tragelaphus scriptus female clan home ranges}, year = {2006}, abstract = {We examined factors predicting female densities within the common home ranges of related females ("clans") in bushbuck Tragelaphus scriptus Pallas, 1776. In this species, each female forms an individual home range, but the home ranges of matrilineal clan members strongly overlap. We found female densities to increase in areas with high canopy cover. Moreover, individual home range sizes tended to decrease with increasing cover. Food plant availability and intruder pressure by two heterospecific competitors did not significantly affect female densities. Apparently, canopy cover is the major limited resource in this species. A possible explanation is that both adult bushbuck and - even more markedly - fawns hide from predators in dense vegetation, in particular in thicket clumps and coalescences. The study shows an effect of habitat properties (eg sufficient canopy cover) on a within-population level in bushbuck, where female densities differ even among proximate clan areas}, language = {en} } @article{FeulnerKirschbaumSchugardtetal.2006, author = {Feulner, Philine G. D. and Kirschbaum, Frank and Schugardt, Christian and Ketmaier, Valerio and Tiedemann, Ralph}, title = {Electrophysiological and molecular genetic evidence for sympatrically occuring cryptic species in African weakly electric fishes (Teleostei : Mormyridae : Campylomormyrus)}, issn = {1055-7903}, doi = {10.1016/j.ympev.2005.09.008}, year = {2006}, abstract = {For two sympatric species of African weakly electric fish, Campylomormyrus tamandua and Campylomormyrus numenius, we monitored ontogenetic differentiation in electric organ discharge (EOD) and established a molecular phylogeny, based on 2222 bp from cytochrome b, the S7 ribosomal protein gene, and four flanking regions of unlinked microsatellite loci. In C tamandua, there is one common EOD type, regardless of age and sex, whereas in C numenius we were able to identify three different male adult EOD waveform types, which emerged from a single common EOD observed in juveniles. Two of these EOD types formed well supported clades in our phylogenetic analysis. In an independent line of evidence, we were able to affirm the classification into three groups by microsatellite data. The correct assignment and the high pairwise FST values support our hypothesis that these groups are reproductively isolated. We propose that in C numenius there are cryptic species, hidden behind similar and, at least as juveniles, identical morphs.}, language = {en} } @article{GessnerArndtTiedemannetal.2006, author = {Gessner, J{\"o}rn and Arndt, Gerd-Michael and Tiedemann, Ralph and Bartel, Ryszard and Kirschbaum, Frank}, title = {Remediation measures for the Baltic sturgeon: status review and perspectives}, series = {Journal of applied ichthyology}, volume = {22}, journal = {Journal of applied ichthyology}, number = {S1}, publisher = {Wiley-Blackwell}, address = {Oxford}, issn = {0175-8659}, doi = {10.1111/j.1439-0426.2007.00925.x}, pages = {23 -- 31}, year = {2006}, abstract = {More than one century ago, sturgeons were prevalent species in the fish communities of all major German rivers both in the North and the Baltic seas drainages. Since then, the populations declined rapidly due to river damming, overfishing and pollution. The last sturgeon catches in the Baltic drainage system occurred during the late 1960ies. Only a few individual captures have been reported during the last 30 years with the most recent records in the Lake Ladoga ( Russia), where the last confirmed catch was recorded in 1984, and a single individual caught off Estonia in 1996. Today, sturgeons are considered missing or extinct in German waters. First attempts for remediation of the species were undertaken in the mid 1990ies. Subsequently, phylogenetic and population genetic analyses of the species were carried out using mtDNA, microsatellites, and nuclear markers ( SNPs). These genetic analyses using recent and historic material have proven the existence of two different species in the Baltic Sea in what was previously considered to represent the European Atlantic sturgeon only. In the Baltic Sea, the American Atlantic sturgeon ( A. oxyrinchus) succeeded to colonize this brackish water system during the Middle Ages. In the North Sea, the European Atlantic sturgeon ( A. sturio) is considered to be the endemic species. These results led to the separation of the remediation activities in the North Sea and the Baltic Sea tributaries. Further studies on the mechanism that lead to the extinction of A. sturio in Germany and the subsequent succession of the A. oxyrinchus mtDNA haplotype are currently been carried out. Broodstock development using the northernmost populations of A. oxyrinchus is currently under way. As a further prerequisite to re-introduce this species into the Baltic, the evaluation of the status of critical habitats for the early life stages of the American Atlantic sturgeon in the River Odra has been performed in collaboration with the Institute for Inland Fisheries of Poland. Alternative fisheries techniques, based on the data of by-catch of exotic sturgeons in the fishery, are presently developed in close cooperation with the fishery to reduce fisheries related mortality in juvenile sturgeons upon release. Monitoring of habitat utilization and migration characteristics of juvenile fish upon experimental release will have to be carried out shortly, using acoustic telemetry, with the aim to follow the fate of the released fish and to determine the best time-size-release-window for future release programmes.}, language = {en} }