18 research outputs found
Are there any traces of Pinus uliginosa in the Stolowe Mountains Outside the Wielkie Torfowisko Batorowskie and Bledne Skaly?
Pinus sylvestris (Scots pine) and taxa from the P. mugo (mountain pine) complex
hybridize in contact zones producing morphologically-intermediate fertile
hybrids. However, the hybrid specimens sometimes express only the P. sylvestris
phenotype. Such cryptic hybrids were detected among P. sylvestris and P. uliginosa
in the western part of Błędne Skały in the Stołowe Mountains, where the pines
grow on the tops of sandstone rocks and phenotypically resemble P. sylvestris,
P. uliginosa, and P. mugo. Hybrids with the P. sylvestris phenotype could be
potentially present in other relic populations of this species in these mountains.
During the present study, the hybrids were identified only in the area of Błędne
Skały based on chloroplast and mitochondrial markers, morphological
differentiation of various needle and cone traits, and phenotype assessments of the
trees during sampling. these hybrids included three cryptic hybrids of P. sylvestris
× P. mugo with the P. sylvestris phenotype and one displaying the phenotype of
P. uliginosa. The other populations analyzed represented Scots pine with no
evidence of hybridization with P. uliginosa and/or P. mugo. Biometric data on the
cone and needle morphology also suggest possible hybridization within the
P. mugo complex on Błędne Skały. The results indicate that hybridization takes
place in this population but not in neighboring populations despite the possible
connection by pollen-mediated gene flow
Phylogeography of two cryptic species of African desert jerboas (Dipodidae : Jaculus)
The lesser Egyptian jerboa Jaculus jaculus is a desert dwelling rodent that inhabits a broad ArabianSaharan arid zone. Recently, two distant sympatric lineages were described in North-West Africa, based on morphometric and molecular data, which may correspond to two cryptic species. In the current study, phylogenetic relationships and phylogeographical structure among those lineages and geographical populations from North Africa and the Middle East were investigated. The phylogeographical patterns and genetic diversity of the cytochrome b gene (1110 bp) were addressed on 111 jerboas from 41 localities. We found that the variation in Africa is partitioned into two divergent mitochondrial clades (10.5% divergence relating to 1.654.92 Mya) that corresponds to the two cryptic species: J. jaculus and J. deserti. Diversifications within those cryptic species/clades were dated to 0.231.13 Mya, suggesting that the Middle Pleistocene climatic change and its environmental consequences affected the evolutionary history of African jerboas. The third distant clade detected, found in the Middle East region, most likely represents a distinct evolutionary unit, independent of the two African lineages