By A cura di Giulio Severino

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This marking technique greatly facilitates the observation of individuals, increases the number of “recoveries” for single birds and allows the production of “life histories” for improved survival estimates. Therefore specific procedures are required to analyse records derived from visual marks, which is beyond the scope of this atlas. Systematics and sequence of species accounts The sequence of the 280 species accounts in the two volumes follows the order as in Speek et al. (2006). Definition of temporal periods When an adequate sample size and seasonal distribution of recoveries was available, analyses have been performed of migratory or dispersion movements on a phenological basis.

However, given the aim of the atlas to offer as homogeneous as possible a treatment of all species for which data be available irrespective of sample size, as well as for understandable limits of space, the degree of detail of the analyses for the single species has been, in most cases, lower than potentially allowed by the available data sets. Differences among species have also been related to sample size, availability of Italian and/or foreign recoveries, seasonal and geographic distribution of records.

Così se fino al 1985 il numero medio nazionale di inanellamenti non ha mai superato il migliaio di soggetti all'anno, tra la seconda metà degli anni ’80 e la prima metà del decennio successivo si è verificato un rilevante incremento dei soggetti marcati grazie all’inizio allo svolgimento di catture mirate presso una serie di colonie localizzate in ambito fluviale e di cava delle province di Parma, Reggio Emilia e Forlì. 800 soggetti. Statistiche campione analizzato - Recovery sample statistics Statistiche campione N.

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