Armando Contreras-Balderas - Academia.edu (original) (raw)

Papers by Armando Contreras-Balderas

Acta zoológica mexicana, 2014

There is limited information on chromatic aberrations in Mexican birds especially in the exotic b... more There is limited information on chromatic aberrations in Mexican birds especially in the exotic bird, house sparrow (Passer domesticus). We report two cases from northern Mexico.

Revista Mexicana De Biodiversidad, Mar 1, 2011

We analyzed lizard population density and tail loss frequency in 2 populations of Uma paraphygas ... more We analyzed lizard population density and tail loss frequency in 2 populations of Uma paraphygas to determine if the proportion of lizards with tail loss was different between populations, sexes, and age classes. Also, we estimated unbroken and regenerated tail growth rates for adult males and females, and juveniles. Data were collected between fall 1997 and summer 1999. Tail loss incidence was relatively low overall, but was significantly higher at the site (Dune 1) with lower vegetation cover. Adult lizards showed a higher tail loss frequency than juveniles at the site with higher vegetation density (Dune 2); there was no difference between adult males and females in both dunes. Observations on 33 lizards with bite marks suggest that intraspecific encounters are not a direct cause of caudal autotomy in this species. The caudal growth rates of lizards were similar for unbroken and regenerated tails between sexes and among age classes.

Journal of Raptor Research, 2000

Acta Zoológica Mexicana (nueva serie), Apr 1, 2013

How to cite Complete issue More information about this article Journal's homepage in redalyc.org ... more How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative

ACTA ZOOLÓGICA MEXICANA (N.S.)

We report the presence of an individual of Great-tailed Grackle with partial leucism, in a locali... more We report the presence of an individual of Great-tailed Grackle with partial leucism, in a locality of the State of Nuevo León, México, on 28 November 2014. One female with abnormal coloration in the upper tail feathers was recorded and photographed.

Standing between Life and Extinction

Revista De Biologia Tropical, May 2, 2016

The present paper includes nine species of birds here reported from collections made in October 1... more The present paper includes nine species of birds here reported from collections made in October 1979 and August 1980. These are: Calidris alpina pacifica, Limnodromus griseus hendersoni, Gallinogo gallinago delicata, Crotophaga sulcirostris sulcirostris, Chloroceryle americano hachisukai, Spiza americana, and Melozpisa lincolnii lincolnii. Fragata magnificens and the exotic Passer domesticus were observed but not collected

Revista de Biología Tropical, 2017

The reintroduction of missing mammal species in former habitats has recently been of high interes... more The reintroduction of missing mammal species in former habitats has recently been of high interest. In Mexico, there have been several attempts to reintroduce Antilocapra since 1967, but until now none of the trials has been successful. Nowadays, different releasing methods have been practiced for mammal species, including soft and hard release ones. The aim of this study was to provide new information, and to evaluate the success of a recent release. The study was based on the monitoring of 100 individuals (70 females, 30 males) captured in New Mexico, USA, to be released in Maderas del Carmen, Coahuila, Mexico, in two different groups. The first group (fast release) of 45 specimens (20 females, 25 males) was released in the valley at the beginning of March 2009. The second one (soft release), with 55 individuals (50 female, 5 male), was released in March 2010. For both groups, we compared the mortality rate between dispersal and soft-release vs. hard-release methods. Our results s...

Acta Zoologica Mexicana, Aug 1, 2011

Antropización: Primer Análisis Integral, 2019

Revista de Biología Tropical, 2018

Small and isolated populations of bighorn sheep (subject to special protection according to NOM-0... more Small and isolated populations of bighorn sheep (subject to special protection according to NOM-059-SEMARNAT-2010) are vulnerable to predation by mountain lion in habitat sympatric with mule deer. Understanding the specific causes of death and survival is important for the development of conservation strategies for bighorn sheep and other ungulates that share the same habitat, such as mule deer.We evaluated and compared the rate of predation by puma in 12 bighorn sheep (10 females, two males) and 10 adult females of mule deer with radio collars through measure risk program (micromorts). The impact of predation in both populations of herbivores is evaluated through the estimation of densities of sheep and mule deer. 88 % (8/9) deaths by puma in bighorn sheep with an average monthly survival rate of 0.79 and predation rates due to puma range from 0.17 to 0.30. In mule deer predation due to puma was 83 % (5/6) with an average monthly survival rate of 0.86 and predation rates due to pum...

Texas Journal of Science

This study examined the avifauna of three vegetational communities of the Sierra San Antonio Peña... more This study examined the avifauna of three vegetational communities of the Sierra San Antonio Peña-Nevada of northeastern Mexico, from June 2001 to May 2002. A total of 1,084 individuals were recorded, comprising 83 species, 62 genera, 31 families and 9 orders. The ecological associations of the species were as follows: Pine 40; Pine-Oak 48; and Oak 40. Based on the Shannon's Diversity Index, the highest values were obtained for Oak Forest (H'=3.16) and for Spring (H'=3.26).

We studied the infestation degree and corporal distribution of the chigger Eutrombicula alfreddug... more We studied the infestation degree and corporal distribution of the chigger Eutrombicula alfreddugesi on the lizard Sceloporus couchii in a population of Santa Catarina, Nuevo Leon, Mexico. Most lizards had acari; however, the mean number of acari for males was significantly higher than the mean for females. There was not significant relationship among the snout-vent length, weight and the total number of acari in both sexes, probably indicating that this parasite does not influence the physical condition of this lizard. The analysis of the corporal distribution showed that the region where the acari were most concentrated was in the post femoral pockets, followed by the neck region and the axillary region.

Journal of Raptor Research

BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access t... more BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

ACTA ZOOLÓGICA MEXICANA (N.S.)

Las translocaciones han sido una importante herramienta de manejo para la restauración de poblaci... more Las translocaciones han sido una importante herramienta de manejo para la restauración de poblaciones de borrego cimarrón (Ovis canadensis mexicana Merriam, 1901) en su rango histórico en Canadá, Estados Unidos y México. Estudios recientes han sugerido que la depredación del puma (Puma concolor stanleyana Goldman, 1938) tiene importantes efectos sobre la dinámica poblacional en grupos reintroducidos y nativos de borrego cimarrón en áreas donde esta especie es simpátrica con venado bura (Odocoileus hemionus crooki Mearns, 1897). Nuestra hipótesis es que, el tamaño de la población de venado bura determinará el tamaño de la población de los pumas que a la vez ejercerá presión sobre la población del borrego cimarrón. El estudio se basó en el monitoreo de 69 borregos cimarrones (28 machos, 41 hembras) capturados con una la técnica de rifle red desde un helicóptero; 43 borregos (3 machos, 40 hembras) fueron equipados con radio collares con sensores de mortalidad y liberados en 3 períodos ...

Acta zoológica mexicana, 2014

There is limited information on chromatic aberrations in Mexican birds especially in the exotic b... more There is limited information on chromatic aberrations in Mexican birds especially in the exotic bird, house sparrow (Passer domesticus). We report two cases from northern Mexico.

Revista Mexicana De Biodiversidad, Mar 1, 2011

We analyzed lizard population density and tail loss frequency in 2 populations of Uma paraphygas ... more We analyzed lizard population density and tail loss frequency in 2 populations of Uma paraphygas to determine if the proportion of lizards with tail loss was different between populations, sexes, and age classes. Also, we estimated unbroken and regenerated tail growth rates for adult males and females, and juveniles. Data were collected between fall 1997 and summer 1999. Tail loss incidence was relatively low overall, but was significantly higher at the site (Dune 1) with lower vegetation cover. Adult lizards showed a higher tail loss frequency than juveniles at the site with higher vegetation density (Dune 2); there was no difference between adult males and females in both dunes. Observations on 33 lizards with bite marks suggest that intraspecific encounters are not a direct cause of caudal autotomy in this species. The caudal growth rates of lizards were similar for unbroken and regenerated tails between sexes and among age classes.

Journal of Raptor Research, 2000

Acta Zoológica Mexicana (nueva serie), Apr 1, 2013

How to cite Complete issue More information about this article Journal's homepage in redalyc.org ... more How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative

ACTA ZOOLÓGICA MEXICANA (N.S.)

We report the presence of an individual of Great-tailed Grackle with partial leucism, in a locali... more We report the presence of an individual of Great-tailed Grackle with partial leucism, in a locality of the State of Nuevo León, México, on 28 November 2014. One female with abnormal coloration in the upper tail feathers was recorded and photographed.

Standing between Life and Extinction

Revista De Biologia Tropical, May 2, 2016

The present paper includes nine species of birds here reported from collections made in October 1... more The present paper includes nine species of birds here reported from collections made in October 1979 and August 1980. These are: Calidris alpina pacifica, Limnodromus griseus hendersoni, Gallinogo gallinago delicata, Crotophaga sulcirostris sulcirostris, Chloroceryle americano hachisukai, Spiza americana, and Melozpisa lincolnii lincolnii. Fragata magnificens and the exotic Passer domesticus were observed but not collected

Revista de Biología Tropical, 2017

The reintroduction of missing mammal species in former habitats has recently been of high interes... more The reintroduction of missing mammal species in former habitats has recently been of high interest. In Mexico, there have been several attempts to reintroduce Antilocapra since 1967, but until now none of the trials has been successful. Nowadays, different releasing methods have been practiced for mammal species, including soft and hard release ones. The aim of this study was to provide new information, and to evaluate the success of a recent release. The study was based on the monitoring of 100 individuals (70 females, 30 males) captured in New Mexico, USA, to be released in Maderas del Carmen, Coahuila, Mexico, in two different groups. The first group (fast release) of 45 specimens (20 females, 25 males) was released in the valley at the beginning of March 2009. The second one (soft release), with 55 individuals (50 female, 5 male), was released in March 2010. For both groups, we compared the mortality rate between dispersal and soft-release vs. hard-release methods. Our results s...

Acta Zoologica Mexicana, Aug 1, 2011

Antropización: Primer Análisis Integral, 2019

Revista de Biología Tropical, 2018

Small and isolated populations of bighorn sheep (subject to special protection according to NOM-0... more Small and isolated populations of bighorn sheep (subject to special protection according to NOM-059-SEMARNAT-2010) are vulnerable to predation by mountain lion in habitat sympatric with mule deer. Understanding the specific causes of death and survival is important for the development of conservation strategies for bighorn sheep and other ungulates that share the same habitat, such as mule deer.We evaluated and compared the rate of predation by puma in 12 bighorn sheep (10 females, two males) and 10 adult females of mule deer with radio collars through measure risk program (micromorts). The impact of predation in both populations of herbivores is evaluated through the estimation of densities of sheep and mule deer. 88 % (8/9) deaths by puma in bighorn sheep with an average monthly survival rate of 0.79 and predation rates due to puma range from 0.17 to 0.30. In mule deer predation due to puma was 83 % (5/6) with an average monthly survival rate of 0.86 and predation rates due to pum...

Texas Journal of Science

This study examined the avifauna of three vegetational communities of the Sierra San Antonio Peña... more This study examined the avifauna of three vegetational communities of the Sierra San Antonio Peña-Nevada of northeastern Mexico, from June 2001 to May 2002. A total of 1,084 individuals were recorded, comprising 83 species, 62 genera, 31 families and 9 orders. The ecological associations of the species were as follows: Pine 40; Pine-Oak 48; and Oak 40. Based on the Shannon's Diversity Index, the highest values were obtained for Oak Forest (H'=3.16) and for Spring (H'=3.26).

We studied the infestation degree and corporal distribution of the chigger Eutrombicula alfreddug... more We studied the infestation degree and corporal distribution of the chigger Eutrombicula alfreddugesi on the lizard Sceloporus couchii in a population of Santa Catarina, Nuevo Leon, Mexico. Most lizards had acari; however, the mean number of acari for males was significantly higher than the mean for females. There was not significant relationship among the snout-vent length, weight and the total number of acari in both sexes, probably indicating that this parasite does not influence the physical condition of this lizard. The analysis of the corporal distribution showed that the region where the acari were most concentrated was in the post femoral pockets, followed by the neck region and the axillary region.

Journal of Raptor Research

BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access t... more BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

ACTA ZOOLÓGICA MEXICANA (N.S.)

Las translocaciones han sido una importante herramienta de manejo para la restauración de poblaci... more Las translocaciones han sido una importante herramienta de manejo para la restauración de poblaciones de borrego cimarrón (Ovis canadensis mexicana Merriam, 1901) en su rango histórico en Canadá, Estados Unidos y México. Estudios recientes han sugerido que la depredación del puma (Puma concolor stanleyana Goldman, 1938) tiene importantes efectos sobre la dinámica poblacional en grupos reintroducidos y nativos de borrego cimarrón en áreas donde esta especie es simpátrica con venado bura (Odocoileus hemionus crooki Mearns, 1897). Nuestra hipótesis es que, el tamaño de la población de venado bura determinará el tamaño de la población de los pumas que a la vez ejercerá presión sobre la población del borrego cimarrón. El estudio se basó en el monitoreo de 69 borregos cimarrones (28 machos, 41 hembras) capturados con una la técnica de rifle red desde un helicóptero; 43 borregos (3 machos, 40 hembras) fueron equipados con radio collares con sensores de mortalidad y liberados en 3 períodos ...