Author(s)

Jose Hugo Martinez-Guerrero, Martin Emilio Pereda-Solis, Christian Wehenkel

Facultad de MedicinaVeterinaria y Zootecnia. Universidad Juarez del Estado de Durango, Durango, Mexico.
Instituto de Silvicultura e Industria de la Madera, Universidad Juarez del Estado de Durango, Durango, Mexico.

During the winter of 2009 grassland birds were monitored in the region of Cuchillas de la Zarca to estimate the association betweenAmmodramus bairdiiAudubon 1844, focal species of grassland and bird species belonging to the trophic guild of grassland granivorous birds (n = 25 ). The study area was divided into monitoring quadrants (n = 16) where 96 transects for bird monitoring were conducted, recording 16,635 individuals of which only 32.9% were in the trophic guild of grassland granivorous birds. The association betweenA. bairdiiand other species was estimated from the nonparametric statistical index of Kendall’s coefficient of concordance (W) and the p value, through permutation analysis (n = 10,000), finding positive and significant associations (p≤0.05) of the target species for study withSturnella magna,Passerculus sandwichensisandAmmodramus savannarum, species that share habitat preferences of natural grassland in good condition, slightly grazed and with little tolerance to the shrub cover. The association W ranged from 0.072 and 0.749. These results can recognize this region as an important area for the conservation of obligate grassland birds during winter, suggesting establish training programs to better utilize this resource by means of cattle activity.

Grassland Birds, Kendall Coefficient, Baird’s Sparrow, Winter Monitoring

Martinez-Guerrero, J. , Pereda-Solis, M. and Wehenkel, C. (2014) Association of Ammodramus bairdii A. 1844, and Other Species of Grassland Granivorous Birds in Winter Time in Northwestern Mexico. Open Journal of Ecology, 4, 281-288. doi: 10.4236/oje.2014.45026.