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A tale of two tails:asymmetry in Great Grey Shrike(Lanius excubitor)

Avian Research 2018年第1期9卷 19-26页

作者： reuven yosef Anna Maria Kubicka Martin Brandsma Piotr Tryjanowski Ben-Gurion University of the Negev-Eilat Campus RO.Box 27288106 EilatIsrael. Institute of Zoology Poznan University of Life SciencesWojska Polskiego 71 C60-625 Poznari Poland. Noordwolde The Netherlands

Background: Asymmetry in the wild is a controversial, and to date, unresolved *** asymmetry(FA) is the developmental instability(intra-individual variation) while, directional asymmetry(DA) expresses the asymmetry of the population ***: We analysed 63 Great Grey Shrike(Lanius excubitor) skins at the Naturalis Biodiversity Center, Leiden, the *** black markings on the tails were digitized in order to evaluate the symmetry of the two sides of each *** helped understand if nutritional condition affected ***: ANOVA revealed no significant differences in size of the tail between sexes(F = 1.67, p > 0.05).However, there was significant difference in the shape of the black area in feathers between the sexes(F = 2.14, p < 0.05), and males had more elongated and slender black ***, DA was observed only in males, but FA was noted in both *** correlation showed no significant association between FA score and tail features in both the ***, in females, we observed a negative significant correlation between the number of fault and growth *** shape of the black area in the tail displayed no statistically significant association with the tail features in both sexes although growth bars influenced tail shape more than the number of fault ***: We concluded that the characteristics discovered by us need to also be checked in the field and if they can be used to sex ***, chromatic manipulative studies are require to verify if DA influences sexual selection in the Great Grey Shrike.

关键词： Lanius excubitor Ptilochronology Geometric morphometrics Fluctuating Directional asymmetry

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Diet and habitat affinities in six raptor species in India

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Avian Research 2018年第4期9卷 354-362页

作者： Satish Pande reuven yosef Federico Morelli Rajkumar Pawar Ram Mone ELA Foundation C-9 Bhosale ParkSahakarnagrPune 411009India Department of Environmental Sciences Savitribai Phule Pune UniversityGaneshkhindPune 411007India Ben Gurion University of the Negev-Eilat Campus P.O.Box 27288000 EilatIsrael Department of Applied Geoinformatics and Spatial Planning Faculty of Environmental SciencesCzech University of Life Sciences PragueKamycká129165 00 Prague 6Czech Republic

Background: Sympatric species adapt to, and temporally or geographically segregate access to similar limiting ***: We compared nesting habitat and diet affinities of six raptor species in central India between the years ***: A large composition of reptiles in the diet was characteristic for Circaetus gallicus, Spilornis cheela and Elanus caeruleus, while Aquila fasciata, Falco chicquera and Nisaetus cirrhatus show a higher proportion of birds. Species with greatest similarity of diet were C. gallicus and S. cheela. Considering the environmental characterization of areas where raptors built the nest, some species were ecologically closer than others. N. cirrhatus and S. cheela were related to the presence of water bodies, dry deciduous forest and evergreen forests, while E. caeruleus and C. gallicus preferred more open habitats. A. fasciata bred either on cliffs or trees, F. chicquera on trees or mobile towers, and the other four species built their nests exclusively in ***: We conclude that although there was overlap in diet and nesting ecology for a number of species, the geographical separation likely limits competition for resources.

关键词： Raptor species Diet Breeding area Niche overlap Resource partitioning

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