Bird Numbers 2010 “Monitoring, indicators and targets” 18th Conference of the European Bird Census Council Book of Abstracts 22-26 March 2010 Cáceres • Extremadura • Spain
Bird Numbers 2010 “Monitoring, indicators and targets” 18th Conference of the European Bird Census Council Book of abstracts 22-26 March 2010 • Cáceres • Extremadura • Spain
Edition: Ana Bermejo Organizing Committee: Juan Carlos del Moral, Fernando Barrio, Virginia Escandell, Laura Trapero, Ana Bermejo, Blas Molina, David Palomino, Arantza Leal, Javier de la Puente, Carmen Fernández, Josefina Maestre & Marcelino Cardalliaguet. Scientific Committees: EBCC: Dr Richard D. Gregory, Dr Hans-Günther Bauer, Dr Anny Anselin, Dr Ruud P. B. Foppen, Dr Åke Lindström, Dr Frederic Jiguet, Dr Alexander Mischenko, Dr Svetoslav Spasov, Dr Ian Burfield, Dr David Noble & Dr Petr Voríšek. Local: Dr Alejandro Sánchez, Dr David Serrano, Dr Javier Seoane, Dr Lluís Brotons, Dr David Palomino, Dr Ana Bermejo & Juan Carlos del Moral. Recommended citation for publication Bermejo, A. (Ed.). 2010. Bird Numbers 2010 “Monitoring, indicators and targets”. Book of abstracts of the 18th Conference of the European Bird Census Council. SEO/BirdLife. Madrid.
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Bird Numbers 2010 · Monitoring, indicators and targets
Figure 1. Number of birds per year according migration counts and sound luring. ECOLOGY AND POSSIBLE EVOLUTION OF CRESTED TIT (LOPHOPHANES CRISTATUS) AND BLACK WOODPECKER (DRYOCOPUS MARTIUS) POPULATIONS IN THE APENNINES, ITALY Guido Tellini Florenzano, Simonetta Cutini, Tommaso Campedelli* & Guglielmo Londi DREAM Italia, Via dei Guazzi 31, I-52014 Poppi (AR), Italy * Corresponding author:
[email protected]
Crested Tit and Black Woodpecker are widespread in North Italy, above all in the Alps, where they are mainly linked with conifer woods. Recently, both species have shown a clear tendency to move southwards, colonizing some areas in the Northern Apennines. If for the Crested Tit this phenomenon seems to proceed regularly along the Apennines from North to South, for the Black Woodpecker the situation seems very different, with the recent discovery of only two separate populations (Valle Aveto, Liguria and Foreste Casentinesi, Tuscany and Emilia-Romagna). It seems, therefore, that, in spite of similar ecological requirements, there are different factors driving these expansions. To investigate these factors, we have built ecological models for both species starting, for the Crested Tit, from all the available presence data in the Northern Apennines, and for the Black Woodpecker, from the observation-
sites collected in the Foreste Casentinesi area, where a specific monitoring project has been carried out by the National Park. Ecological models were built using MaxEnt, a presenceonly modelling method which, following the maximum entropy approach, gives back, for a certain territory, habitat suitable values. We have considered both environmental and climatic variables, retaining only those that were validated with a sub-sampling approach. The results seem to stress well which are the factors leading the two phenomena. Crested Tit, as it is well known, is not particularly linked with climate, in fact the model explicitation at peninsular Italy define, as areas with high suitability values, large part of the Apennines, as well as other sites, often along the sea coast, all characterised by the presence of conifer woods. On the other hand, the Black Woodpecker model shows a high relative importance of climatic variables, with positive effects of rainy and fresh conditions; consequently the areas with high suitability values are concentrated in the Northern Apennines. Both models show also variable levels of connectivity between suitable areas, showing, in South Italy, a large unsuitable belt along the mountain chain. Also the Crested Tit highly-suitable coastal pinewoods seem much more isolated than the mountain woodlands. Both species, following the expansion of conifer woods, seem therefore able to expand their ranges, at least till the Central Apennines (Abruzzo). RINGING OF THE AQUATIC WARBLER IN EUROPE - DOES THE HISTORICAL RINGING DATA PROVIDE ESTIMATE FOR POPULATION DYNAMICS? M rti š Briedis & Oskars Keišs* Laboratory of Ornithology, Institute of Biology, University of Latvia, Miera iela 3, LV-2169 Salaspils, Latvia * Corresponding author:
[email protected]
Quantitative analyses of historical declines in endangered species are usually impossible. We used published reports of European Bird Ringing Schemes to access the numbers of 119
