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Spatial heterogeneity and structure of bird populations: a case example with the eagle owl

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Population Ecology : Volume 46, Issue 1, April 2004

Population Ecology : Volume 45

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Spatial heterogeneity and structure of bird populations: a case example with the eagle owl

Content Provider	Springer Nature Link
Author	Penteriani, Vincenzo Delgado, María del Mar Gallardo, Max Ferrer, Miguel
Copyright Year	2004
Abstract	If individuals of the same population inhabit territories different in landscape structure and composition, experiencing habitat-specific demographic rates, then the landscape features become major determinants of the overall population characteristics. Few studies have tested how habitat-specific demography interacts with landscape heterogeneity to affect populations of territorial species. Here we report a 29-year study of an eagle owl (Bubo bubo) population in southern France. The aim of this study was to analyse how habitat heterogeneity could affect density and breeding performance. Mean productivity for the overall sample was 1.69±0.76 fledglings per breeding pair and, after controlling for year effect, significant differences between territories were detected for productivity. A positive correlation was found between the percentage of pairs producing 50% of the annual fledged young (an index of the distribution of fecundity among nesting territories) and the mean reproductive outputs, that is the heterogeneous structure of the population determined that most/all pairs contributed to the annual production of young during good years, but the opposite during poor years (i.e. fewer pairs produced the majority of fledglings). Mean reproductive output was positively affected by percentage of open country and diet richness. Although other factors different to territory quality could affect demography parameters (e.g. quality of breeders), our results clearly showed a significant correlation between landscape features and population productivity.
Starting Page	185
Ending Page	192
Page Count	8
File Format	PDF
ISSN	14383896
Journal	Population Ecology
Volume Number	46
Issue Number	2
e-ISSN	1438390X
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-06-25
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Spatial heterogeneity Territory quality Breeding performance Coefficient of variation Bird populations Eagle owl (Bubo bubo)
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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