Density and biology of the rock‐partridge(Alectoris graeca whitakeri)in Sicily (Italy)
作者:
Maurizio Sarà,
期刊:
Bolletino di zoologia
(Taylor Available online 1989)
卷期:
Volume 56,
issue 2
页码: 151-157
ISSN:0373-4137
年代: 1989
DOI:10.1080/11250008909355637
出版商: Taylor & Francis Group
关键词: Rock‐partridge;Relative density sampling;Statistical analysis;Breeding biology
数据来源: Taylor
摘要:
Relative indices (MOT = the average number of birds counted during the trips in the breeding season; ITA = the average number of birds encountered per hour during the trips in the breeding season) were used to monitor the rock‐partridge breeding population in four areas of Sicily. Statistical analysis of variance demonstrated that the indices are unbiased estimators of the populations under study. The Anova Model II results showed that sampling means were obtained by studying populations of different densities in the chosen areas. The reason for this difference is due to the different habitat structure and mainly to the presence‐absence of hunting protection. Post‐breeding relative indices (MOTpb = the average number of birds encountered during the trips in the post‐breeding season; MIB = the average number of birds gathered in coveys) were also useful in population monitoring. Data on breeding biology show a medium productivity rate (ratio juveniles/adults) of the population. Pair‐forming starts in February, egg‐laying occurs from March to June, while chicks are present from June to September; average clutch size is 12 eggs. The seasonal development of calling activity through different time bands is also reported.
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