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• W85124827 abstract "Breeding bird density and community structure in Macedonian pine forests were studied during 3 successive years (2004-2006) in the Pirin national park, Bulgaria. Bird sampling, using point counts, recorded 2583 birds belonging to 31 species. The relative density was computed for the most abundant 20 species by the DISTANCE software. The results show that Macedonian pine forests hold signifi- cant numbers of willow and coal tits, treecreeper, nutcracker, chaffinch and bullfinch and act as a potential reservoir for these species, not only regionally, but also on a national and possibly European scale. The overall bird density in the Macedonian pine forest was very similar to the mean overall bird density in the European temperate coniferous forests and was unstable among years. The variability was due mainly to the fluctuations in abundances of permanent residents and, to a lesser extent, short-distance migrants. However, the abun- dance of long-distance migrants remained relatively stable. A comparison with a previous study (from the 1970s) showed little evidence of significant changes in bird densities in this habitat over the past 40 years. Riassunto - Densita e struttura della comunita di uccelli nidificanti nelle foreste di Pinus peuce in Bulgaria. - Nel corso di 3 stagioni riproduttive successive (2004-2006), sono state studiate le densita e la struttura della comunita degli uccelli nidificanti nelle foreste di P. peuce nel parco nazionale Pirin (Bulgaria). Durante i censimenti, effettuati mediante punti d'ascolto, sono stati contattati 2583 individui appartenenti a 31 specie. La densita e stata stimata per le 20 specie piu abbondanti mediante il software DISTANCE. I risultati mostra- no che le foreste di P. peuce ospitano significative densita di cincia bigia alpestre, cincia mora, rampichino alpestre, nocciolaia, fringuel- lo e ciuffolotto, tanto da rappresentare un potenziale serbatoio per queste specie, non solo a scala regionale, ma potenzialmente anche a scala europea. La densita complessiva degli uccelli nidificanti e simile a quella mediamente riscontrata nelle foreste di conifere delle aree temperate europee e relativamente instabile tra anni. Tale variabilita e essenzialmente dovuta a fluttuazioni di abbondanza delle specie residenti e, in misura minore, dei migratori a corto raggio. Le abbondanze dei migratori a lunga distanza sono invece relativamente stabili tra anni. Il confronto con uno studio condotto in precedenza (negli anni '70 del secolo scorso) non evidenzia significativi cambi- amenti nelle densita di uccelli nidificanti in questo ambiente nell'arco degli ultimi 40 anni." @default.
• W85124827 created "2016-06-24" @default.
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• W85124827 date "2007-01-01" @default.
• W85124827 modified "2023-09-27" @default.
• W85124827 title "Density and community structure of breeding birds in Macedonian pine Pinus peuce forests in Bulgaria" @default.
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