Distribution pattern among Golden Eagle Aquila chrys tos and Bonelli s Eagle Hiera tus fasciatus in the Castellon province.

Bonellis Eagle (Aquila fasciata) Science Article 1

abstract

Aims: Spatial distribution patterns of Golden Eagle Aquila chrys tos and Bonelli s Eagle Hiera tus fasciatus have been analyzed in a sympatric Mediterranean area.Location: Castellon province and the Teruel border area, in the M strazgo region. Methods: The nearest neighbor distance has been taken as an aggregation measure. G-test and complementary Campbell graphical analysis have been used (Table 1).Results: Both Golden Eagle and Bonelli s Eagle show G-values larger than 0.65 threshold. According to Campbell graphical analysis, both species showed an aggregated distribution pattern as much as separately as when treated together (Fig. 1-3). Quadratic regression models (with larger r2 in all cases) explained more variance than linear models.Conclusions: In the study area, four main factors could be influencing on the aggregated distribution pattern found: a non homogeneous resources distribution, competitive interactions existence, conespecifics social attractions and direct and indirect human persecution.

Pascual Lopez-Lopez, Clara Garcia-Ripolles, Francisco Garcia-Lopez, Jose Miguel Aguilar & Jose Verdejo, Ardeola 51(2), 2004, 275-283

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