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Accueil du site → Doctorat → Mexique → Dinámica poblacional del tecolote llanero occidental (athene cunicularia hypugaea) en zonas de pastizal en el Noreste de México

Universidad Autónoma de Nuevo León (2014)

Dinámica poblacional del tecolote llanero occidental (athene cunicularia hypugaea) en zonas de pastizal en el Noreste de México

Ruiz Aymá, Gabriel

Titre : Dinámica poblacional del tecolote llanero occidental (athene cunicularia hypugaea) en zonas de pastizal en el Noreste de México

Auteur : Ruiz Aymá, Gabriel

Université de soutenance : Universidad Autónoma de Nuevo León

Grade : Doctor en Ciencias con acentuación en Manejo de Vida Silvestre y Desarrollo Sustentable UANL, 2014.

The western burrowing owl (Athene cunicularia hypugaea) is distributed in Canada, the U.S. and Mexico. Part of the group of grassland bird species that are threatened by habitat loss. The study sites are located within the Chihuahuan Desert Ecoregion . For the state of Nuevo Leon, in the town of Galeana were : The Llano La Soledad, El Compromiso, La Martha, La Concha A and B and La Hediondilla and San Luis Potosi the town of Llano Vanegas of El Manantial and El Gallo A and B. The first objective was to estimate the abundance and density of resident populations of burrowing owls in Mexican prairie dog colonies in northeastern Mexico. Surveys were conducted during the months of March to July 2010 and 2011. The line transect method was used. Separated by more than 500 m, a total of 50 transects (60 ha 2x 0.3 km) were monitored. Data were analyzed using DISTANCE 6.0 © program to estimate the density of birds per hectare. The overall density of owls estimated fifty colonies of Mexican prairie dogs was 0.1 ind / ha (95% CI 0.07-0.15) in 2010 and 0.09 ind / ha (95% CI 0.06-0.14) in 2011. The second objective was to analyze the local movements and dispersal of juveniles of a resident population of burrowing owls. In 2010, they conducted intensive nest searches in NL and S.L.P. 15 ± 5 nests were selected randomly, total 45 nests located. The captured individuals were placed color bands in the shanks. Burrowing Owls Top size (fledglings) was placed a backpack transmitter (weight 3 ± 5 g) for the location of habitat use and movement patterns. Based on data analysis Kernel spatial statistical maps (Arc Gis 9.6 ©) were generated to see their movements and habitat use was performed. Transmitters were placed in 15 locations : El Erial (3) San Juan del Prado (1), San Rafael (4), La Soledad (4) in Galeana, N.L. and the Gallo Vanegas, S.L.P. A total of 28 chickens-fledglings were captured. Movements were recorded at distances up to 76 km which was captured in Soledad and scored record visual signal and in the town of el Manatial ; S.L.P. Other patterns of local movements were in the towns of El Erial with a displacement of 9 km. Habitat preference with 204 records placed transmitters registering a 76 % in colonies of prairie dogs , 14% in crops (potato ,pumpkin), impact areas (buildings, landfills), roads 3% and 1% was obtained in other areas such as scrub, grassland without burrows. The third goal was the selection of sites for burrowing owl nesting in colonies of Mexican prairie dogs in northeastern Mexico. During the months of March to May 2010 and 2011, was carried out intensive search burrowing owl nests. In localities N.L. and S.L.P. They took out four specific measurements landscape scales (burrows, site colony and landscape). In turn, replica of each nest are performed with scales landscape. Descriptive statistics were obtained from the measurements. Using a Spearman correlation a group of variables is selected in each landscape category. In partnership of meristic variables obtained at nesting sites logistic regression analysis was used to select categorical variables that are required for the use of nest burrows at nesting sites. 24 Scenic models of all scales were obtained. A general model with the lowest values of AIC and wi is obtained. The combined variables of different scales included diameter, distance higher level, height of vegetation, inactive burrows within 25m distance satellite burrows , vegetation , active burrows 50m and number of hangers with 81,179 AIC and wi 0.6434 . The results are the first systematic effort that enables us to keep the status of resident populations of burrowing owls in the Mexican prairie dog colonies located in Nuevo Leon and San Luis Potosi, these being the best preserved and largest area in Mexico.


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