• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2001
• Subjects: Circus cyaneus
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.3129; http://www.cebc.cnrs.fr/publipdf/2001/GE24.pdf

Effect of abiotic factors on reproduction in the centre and periphery of breeding ranges: a comparative analysis in sympatric harriers J. T. Garcı́a and B. E. Arroyo Garcı́a, J. T. and Arroyo, B. E. 2001. Effect of abiotic factors on reproduction in the centre and periphery of breeding ranges: a comparative analysis in sympatric harriers. – Ecography 24: 393–402. Variables such as weather or other abiotic factors should have a higher influence on demographic rates in border areas than in central areas, given that climatic adapta-tion might be important in determining range borders. Similarly, for a given area, the relationship between weather and reproduction should be dissimilar for species which are in the centre of their breeding range and those that are near the edge. We tested this hypothesis on two sympatric ground-nesting raptors, the hen harrier Circus cyaneus and the Montagu’s harrier Circus pygargus in Madrid, central Spain, where the hen harrier is at the southern edge of its breeding range in the western Palearctic