16 Result(s)
within
Ralph Tiedemann
Ecology
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Article
Open AccessDrivers of zooplankton dispersal in a pond metacommunity
Dispersal success is crucial for the survival of species in metacommunities. Zooplankton species engage in dispersal through time (i.e., egg bank) and space (i.e., vectors) by means of resting eggs. However, d...
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Open AccessGenome-wide analysis of the harbour porpoise (Phocoena phocoena) indicates isolation-by-distance across the North Atlantic and potential local adaptation in adjacent waters
The harbour porpoise (Phocoena phocoena), a highly mobile cetacean species of the Northern Hemisphere, inhabits basins that vary broadly in salinity, temperature, and food availability; such variation can drive d...
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Article
Open AccessMorphological differentiation in African weakly electric fish (genus Campylomormyrus) relates to substrate preferences
Under an ecological speciation scenario, the radiation of African weakly electric fish (genus Campylomormyrus) is caused by an adaptation to different food sources, associated with diversification of the electric...
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Article
Negative phototactic response to UVR in three cosmopolitan rotifers: a video analysis approach
Ultraviolet radiation (UVR) is an environmental stressor in several ecosystems and can affect organisms’ survival and reproduction, and community structure. Rotifers cope with UVR stress adopting preventive be...
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Article
Genetic structure reveals management units for the yellow cardinal (Gubernatrix cristata), endangered by habitat loss and illegal trap**
The yellow cardinal, Gubernatrix cristata, is an endangered passerine from southern South America. Populations are declining due to the loss of their natural habitat, which has caused a fragmented distribution, a...
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Article
Environmental niche factor analysis (ENFA) relates environmental parameters to abundance and genetic diversity in an endangered amphibian, the fire-bellied-toad (Bombina bombina)
Increasing attempts are made to understand the factors responsible for both the demographic and genetic depletion in amphibian populations. Landscape genetics aims at a spatially explicit correlation of geneti...
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Article
Erratum to: Large-scale mitochondrial phylogeography in the halophilic fairy shrimp Phallocryptus spinosa (Milne-Edwards, 1840) (Branchiopoda: Anostraca)
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Article
Mitochondrial DNA and microsatellites reveal significant divergence in the beachflea Orchestia montagui (Talitridae: Amphipoda)
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 s...
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Article
Fourteen new microsatellite markers for the Visayan tarictic hornbill (Penelopides panini) and their cross-species applicability among other endangered Philippine hornbills
Fourteen microsatellite markers were isolated and characterized for the endangered Visayan tarictic hornbill (Penelopides panini, Aves: Bucerotidae). In an analysis of 76 individuals, the number of alleles per lo...
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Mitochondrial Control Region and microsatellite analyses on harbour porpoise (Phocoena phocoena) unravel population differentiation in the Baltic Sea and adjacent waters
The population status of the harbour porpoise (Phocoena phocoena) in the Baltic area has been a continuous matter of debate. Here we present the by far most comprehensive genetic population structure assessment t...
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Article
mtDNA indicates profound population structure in Indian tiger (Panthera tigris tigris)
We analyzed mtDNA polymorphisms (parts of control region, ND5, ND2, Cytb, 12S, together 902 bp) in 59 scat and 18 tissue samples from 13 Indian populations of the critically endangered Indian tiger (Panthera tigr...
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Large-scale mitochondrial phylogeography in the halophilic fairy shrimp Phallocryptus spinosa (Milne-Edwards, 1840) (Branchiopoda: Anostraca)
In this study we analyzed patterns of sequence divergence in about 1kb of mitochondrial DNA coding for two genes (16S rRNA and Cytochrome Oxidase I, COI) in 15 populations and 61 individuals of the halophilic ...
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Article
Atlantic sturgeons (Acipenser sturio, Acipenser oxyrinchus): American females successful in Europe
Recent molecular data on the maternally inherited mitochondrial (mt) DNA have challenged the traditional view that the now extinct Baltic sturgeon population belonged to the European sturgeon Acipenser sturio. In...
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A PCR-based molecular identification key to the glochidia of European freshwater mussels (Unionidae)
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Article
Seasonal changes in the breeding origin of migrating Dunlins(Calidris alpina) as revealed by mitochondrial DNA sequencing
In the North Sea Wadden Sea, Dunlins of the two subspeciesCalidris alpina alpina andC. a schinzii occur on migration. In this study, I investigate the putative breeding origin of Dunlins caught at the Sylt/Rømø W...
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Article
Saisonale und tidale Variation in der Nutzung von Wattflächen durch nahrungssuchende Vögel
Densities of feeding birds were estimated on tidal mud flats in relation to season and tide. Dunlin, Knot, Bar-tailed Godwit, Oystercatcher, Golden Plover, Common Gull, and Black-headed Gull were most abundant...
