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28/10/2014
The dominant criterion to determine when an introduced species is established relies on the viability of the population from a demographic perspective. By means of an intensive five year capture-recapture monitoring program the demography of five introduced passerine bird species established in southern Spain have been studied. Estimates of demographic parameters for one colonial species (Ploceus melanocephalus) were obtained, confirming the long-term viability of its local population. However, extremely low recapture rates prevented the estimation of these parameters for widely distributed species with low local densities (Estrilda troglodytes and Amandava amandava) but also for highly abundant yet non-colonial species (Estrilda astrild and Euplectes afer. The analysis of spatio-temporal species distributions complemented with expert opinion deserve thus their role in the assessment of establishment success of introduced species. informacion[at]ebd.csic.es: Sanz-Aguilar et al (2014) Can establishment success be determined through demographic parameters? A case study on five introduced bird species. PLoS ONE 9(10) e110019. Doi 10.1371/journal.pone.0110019
23/10/2014
Determining spatio-temporal dynamics in distribution and structure of different populations is crucial to our understanding of their ecology and interactions. The winter distribution of Marsh Harrier (Circus aeruginosus) in the Iberian Peninsula is used to analyse the potential of spatial distribution models and stable isotope analyses of feathers to evaluate differences in spatial distribution of migrant and resident raptor populations in southern Europe. Most migrant harriers had a central and northern latitudinal European origin. Results revealed segregation in the winter distribution of migrant and resident populations, suggesting that ecological conditions and potential stressors could greatly differ among resident and migrant populations in winter. A useful methodological procedure is provided to evaluate spatial segregation and presenting a new challenge to the study of their ecological consequences. informacion[at]ebd.csic.es: Cardador et al (2014) Breeding origin and spatial distribution of migrant and resident harriers in a Mediterranean wintering area: insights from isotopic analyses, ring recoveries and species distribution modelling. J Ornithol. Doi: 10.1007/s10336-014-1122-0
20/10/2014
A new species within the genus Liolaemus from southeast Argentine Patagonia is described. This new taxon, Liolaemus yatel sp. nov., presents anatomical traits shared with the Liolaemus lineomaculatus section within the Liolaemus lineo-maculatus group. However, Liolaemus yatel sp. nov. does not exhibit trifid dorsal scales, which is a diagnostic character of the L. lineomaculatus group. Moreover, this new species differs from other taxa of the L. lineomaculatus group in that dorsal and nuchal scales either completely lack keels or are slightly keeled. Additionally, the presence of trifid scales in Liolaemus magellanicus was recorded, another species included in the L. lineomaculatus section. These findings provide additional information for the study of evolutionary relationships among the species of the L. lineomaculatus section, especially the establishment of their diagnostic character status. informacion[at]ebd.csic.es: Abdala et al (2014) New Patagonian species of Liolaemus (Iguania: Liolaemidae) and novelty in the lepidosis of the southernmost lizard of the world: Liolaemus magellanicus. Zootaxa 3866: 526-542. Doi: 10.11646/zootaxa.3866.4.4
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    Estación Biólogica de Doñana - Consejo Superior de Investigaciones Científicas - Apdo 1056 E - 41013 Sevilla
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