Search results for "FUSCUS"
showing 3 items of 3 documents
Fossorial but widespread: the phylogeography of the common spadefoot toad (Pelobates fuscus), and the role of the Po Valley as a major source of gene…
2007
International audience; Pelobates fuscus is a fossorial amphibian that inhabits much of the European plain areas. To unveil traces of expansion and contraction events of the species' range, we sequenced 702 bp of the mitochondrial cytochrome b gene. To infer the population history we applied phylogeographical methods, such as nested clade phylogeographical analysis (NCPA), and used summary statistics to analyse population structure under a neutral model of evolution. Populations were assigned to different drainage systems and we tested hypotheses of explicit refugial models using information from analysis of molecular variance, nucleotide diversity, effective population size estimation, NCP…
Abinieku sugu daudzveidība un nārsta ūdenstilpes Aizsargājamo ainavu apvidū „Ādaži”
2015
Darba ietvaros veikti 5 abinieku sugu (Rana arvalis; Rana lessonae; Epidalea calamita; Pelobates fuscus; Triturus vulgaris) iespējamo nārstošanas vietu apsekojumi Ādažu poligonā, kur notiek militārās apmācības. Darba mērķis: izpētīt ūdenstilpju ekoloģiskās īpatnības un analizēt, kādi faktori veido sugu nārsta nišas. Lauka darbi veikti Ādažu poligona C sektorā, kā parauglaukumus ieviešot apsekotās ūdenstilpes. Apkopota informācija par ūdenstilpju koordinātēm, lielumu, dziļumu, veģetāciju un tajā sastopamajiem abiniekiem. Galvenie rezultāti: izdalās faktori, kas liecina par katras sugas specifiskumu: T. vulgaris - ūdenstilpju dziļums; P.fuscus - makrofītu aizaugums (%); R.lessonae – grīšļu un…
Maternal antibody transmission and breeding densities in the Black-headed Gull Larus ridibundus
2004
1. The offspring of avian species, especially those of colonial breeders, are exposed to a number of pathogens immediately after birth. The chick's immune system is, at that early stage still immature and inefficient. As a consequence, diseases can have a strong impact on chick survival.2. The ability of mothers to transmit passive immunity in terms of antibodies of their own acquired immunity to their chicks is probably an essential pathway to enhance the chick survival. Since the production of antibodies is costly, females are expected to adjust the transmission of passive immunity to the local disease environment.3. We found that in Black-headed Gulls (Larus ridibundus L.) yolk antibody …