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Search Results: 1 - 10 of 226025 matches for " D.;Santos-Moreno "
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The presence of Abronia oaxacae (Squamata: Anguidae) in tank bromeliads in temperate forests of Oaxaca, Mexico
Cruz-Ruiz, GI.;Mondragón, D.;Santos-Moreno, A.;
Brazilian Journal of Biology , 2012, DOI: 10.1590/S1519-69842012000200015
Abstract: the presence of lizards in bromeliads has been widely documented. nevertheless, the possibility of some type of preference or specificity among lizards for particular bromeliad species has not yet been investigated. therefore, this study aims to document the presence of abronia oaxacae in six species of tank bromeliads found in pine forests, pine-live oak forests, and live oak groves during both the rainy season and the dry season. three adult individuals of abronia oaxacae were collected; one in a tillandsia violácea (pine-live oak forest), one in a t. calothyrsus (live oak grove), and one in a t. prodigiosa (live oak grove). all three specimens were collected in sampling efforts carried out during the dry season. the results of the present study suggest that a. oaxacae shows no preference for a single, specific bromeliad species, although it does have a certain preference for a few select species. the presence of a. oaxacae in bromeliads during the dry season could be related to the cooler, moister microhabitat that these plants represent.
Movements and capture-recapture data analysis of the vesper rat (Nyctomys sumichrasti: Rodentia, Muridae) in a tropical forest in northeastern Oaxaca, Mexico
PéREZ-LUSTRE, Martín;SANTOS-MORENO, Antonio;
Acta zoológica mexicana , 2010,
Abstract: in order to explain the population demography of the vesper rat (nyctomys sumichrasti) and with regarding to an estimate of population size and survival rates, as well as possible differences in the movements distances between males and females, we analyzed capture-recapture data of this species from a trapping effort of 455 trap-nights and a total of 157 captures of 36 individuals which were livetraped at 3 trap heights: 3-9 m above ground (low canopy), 9-15 m (medium canopy) and the highest part of the canopy, 15-21.5 m. due to differences between age categories in sample size, the analysis of capture-recapture histories was restricted to adult individuals. the sample of 29 adult individuals included 12 females (8 singletons and 4 captured in the complete study) and 17 males (5 singletons and 12 captured in the complete study); which represents a sex-ratio of 1:1.41, which did not differ statistically from 1:1. the capture-recapture histories were analyzed using the cormack-jolly-seber model, where the best model maintains the survival constant and equal between sexes, and capture probability is constant through time, but differs between sexes. the survival probability was 0.8287, while the capture probability was 0.874 for males and 0.5733 for females. estimated population size included 19 males and 21 females. the average distance travelled by females was 34.86 m (standard deviation 5.92) with extreme values of 20.1 to 60.32, whereas for males was 35.42 m (standard deviation 18.27), with extreme values of 10.3 to 75.1 m.
Mammalian prey of barn owl (Tyto alba) in southeastern Oaxaca, Mexico
SANTOS-MORENO, Antonio;ALFARO-ESPINOSA, Ana María;
Acta zoológica mexicana , 2009,
Abstract: the analysis of pellet contents of barn owls from southeastern oaxaca, mexico, shows that mammals represent the main prey of this bird. we identified a minimum of 184 individuals from 2 orders, 3 families and 8 species of mammals. the greatest number of prey was from hispid cotton rat (sigmodon hispidus), which represented 83.69% of the total individuals and 84.68% of the biomass of the sample. from the other 7 species included in the pellets, 3 were very uncommon species: the cozumelan golden bat (mimon cozumelae), the false vampire bat (vampyrum spectrum), and the peter's climbing rat (tylomys nudicaudus). bats represented 2.17% of prey number and 0.799% of the total biomass estimated in the sample. comparisons of these results with the estimated abundances by standard trapping methods show differences. these results corroborate a general pattern of barn owl opportunistic predation over the locally most abundant species and bats as rare prey.
Diversidad de una comunidad de mamíferos carnívoros en una selva mediana del noreste de Oaxaca, México
PéREZ-IRINEO, Gabriela;SANTOS-MORENO, Antonio;
Acta zoológica mexicana , 2010,
Abstract: we evaluated several parameters of diversity of a community of carnivorous mammals and their seasonal variation in a heterogeneous landscape of the northeast of oaxaca, mexico. three trails were established for the search of signs, captures of organisms and sightings. six species of carnivorous were recorded. nasua narica was the species with higher relative abundance and density, followed by leopardus pardalis. 57% of the records were obtained during the dry season and 43% in the rainy season, and abundances do not change between seasons. the diversity, as measured by the shannon-wiener index, showed the lowest value in the dry season. the dominance showed similar values in both seasons, with n. narica as the most abundant species. three of the species are found in the category in danger of extinction, and two are between the ten species of greater national priority for the conservation of mexican terrestrial carnivores, which denotes the importance of the zone as refuge of the regional mammalian diversity.
DIVERSIDAD DE UNA COMUNIDAD DE MAMíFEROS CARNíVOROS EN UNA SELVA MEDIANA DEL NORESTE DE OAXACA, MéXICO
Gabriela PéREZ-IRINEO,Antonio SANTOS-MORENO
Acta zoológica mexicana , 2010,
Abstract: Se evaluaron varios parámetros de diversidad de una comunidad de mamíferos carnívoros y su variación entre temporadas en un paisaje heterogéneo del noreste de Oaxaca, México. Se establecieron tres sendas para la búsqueda de rastros, capturas de organismos y avistamientos. Se registraron seis especies en la comunidad de Cerro Tepezcuintle. Nasua narica fue la especie más abundante, seguida de Leopardus pardalis. El 57% de los registros se obtuvieron durante la temporada seca y el 43% en la de lluvias y las abundancias no mostraron diferencias significativas entre temporadas. La diversidad expresada por el índice de Shannon-Wiener mostró el valor más bajo en la temporada seca. La dominancia mostró valores similares en ambas temporadas, con N. narica como la especie más abundante. Tres de las especies registradas se encuentran en la categoría En Peligro de Extinción y dos se encuentran entre las diez especies de mayor prioridad nacional para la conservación de carnívoros terrestres mexicanos, lo que denota la importancia de la zona como un refugio de la diversidad regional.
MOVEMENTS AND CAPTURE-RECAPTURE DATA ANALYSIS OF THE VESPER RAT (NYCTOMYS SUMICHRASTI: RODENTIA, MURIDAE) IN A TROPICAL FOREST IN NORTHEASTERN OAXACA, MEXICO
Martín PéREZ-LUSTRE,Antonio SANTOS-MORENO
Acta zoológica mexicana , 2010,
Abstract: Con la finalidad de conocer algunos parámetros demográficos como el tama o de población y las tasas de supervivencia de la rata arborícola Nyctomys sumichrasti, así como la estimación de distancias recorridas y sus diferencias entre machos y hembras, se analizaron los datos de captura-recaptura de esta especie obtenidos con un esfuerzo de captura de 455 trampas-noches y un total de 157 capturas de 36 ejemplares. Las capturas se realizaron a tres niveles de altitud sobre los árboles: 3-9 m sobre el suelo (dosel bajo), 9-15 m (dosel medio) y la parte más alta del dosel, 15-21.5 m. Debido a las diferencias entre las categorías de edad en el tama o de la muestra, el análisis de las historias de captura-recaptura se restringió a los individuos adultos. La muestra de 29 individuos adultos, incluyó 12 hembras (8 registradas solo en una ocasión y 4 capturadas en todos los muestreos) y 17 machos (5 registrados en un solo muestreo y 12 capturados en todos los muestreos), lo que representa una relación de sexos de 1:1.41, que no difiere estadísticamente de 1:1. Las historias de captura-recaptura se analizaron mediante el modelo probabilístico de Cormack-Jolly-Seber, donde el mejor modelo fue aquel en que la probabilidad de supervivencia aparente es igual entre sexos y constante a través del tiempo (0.8287) y la probabilidad de captura es constante a través del tiempo, pero difiere entre los sexos: 0.874 para los machos y 0.5733 para las hembras. El tama o de la población se estimó en 19 machos y 21hembras. La distancia media recorrida por las hembras fue de 34.86 m (desviación estándar 5.92) con valores extremos de 20.1 a 60.32, mientras que para los machos fue de 35.42 m (desviación estándar 18.27), con valores extremos de 10.3 a 75.1 m.
Mammalian prey of barn owl (Tyto alba) in southeastern Oaxaca, México
Antonio SANTOS-MORENO,Ana María ALFARO ESPINOSA
Acta zoológica mexicana , 2009,
Abstract: Se analizó el contenido de regurgitaciones de una lechuza de campanario del sureste del estado de Oaxaca México. Se encontró que los mamíferos representan la presa principal de esta ave. Se identificaron restos de 184 individuos pertenecientes a dos órdenes, tres familias y ocho especies. La mayor cantidad de restos correspondieron a la rata de los ca averales (Sigmodon hispidus), que representó el 83.69% de individuos y 84.68% de la biomasa contenidos en la muestra. De las otras siete especies, tres son raras: los murciélagos Mimon cozumelae y Vampyrum spectrum y la rata arborícola Tylomys nudicaudus. Los murciélagos representaron el 2.17% de las presas y el 0.799% de la biomasa total estimada en la muestra. Los resultados corroboran un patrón general de depredación oportunista sobre las especies localmente más abundantes.
Diversidad de mamíferos terrestres de talla grande y media de una selva subcaducifolia del noreste de Oaxaca, México Diversity of large and medium sized land mammals of a subcaducifolious tropical forest of north eastern of Oaxaca, Mexico
Gabriela Pérez-Irineo,Antonio Santos-Moreno
Revista mexicana de biodiversidad , 2012,
Abstract: El estado de Oaxaca en el sureste de México alberga una biodiversidad extraordinaria. Sin embargo, las actividades humanas han propiciado alteraciones considerables, incluida la disminución de diferentes ambientes naturales, especialmente de los bosques tropicales; por ello es importante documentar la diversidad de estos ambientes, así como su respuesta a las transformaciones antropocéntricas. Este trabajo tiene como objetivo estimar la diversidad de mamíferos terrestres en una selva mediana en el noreste del estado de Oaxaca, México. Se recorrieron 3 senderos para la búsqueda de rastros, captura de organismos, avistamientos y fototrampeo de septiembre de 2007 a agosto de 2008. Se registraron 15 especies de 6 órdenes, 11 familias y 14 géneros, entre ellas 7 nuevas para la región. Las especies más abundantes fueron Nasua narica, Pecari tajacu, Dasyprocta mexicana, Cuniculus paca y Leopardus pardalis. A pesar de presentar un índice de diversidad bajo con respecto a otros estudios comparables, la presencia de especies consideradas en riesgo por la legislación mexicana, como L. pardalis, L. wiedii, Eira barbara y Tamandua mexicana hacen a la zona valiosa para la conservación de la diversidad en la región. The state of Oaxaca, in southeast Mexico is home to an extraordinary biodiversity. But human activities have led to significant changes, including reduction of different natural habitats, especially tropical forests, so it is important to document the diversity of these environments, and their response to the anthropocentric changes. Therefore, this study aimed to estimate the diversity of terrestrial mammals in a tropical forest in northeastern of the state of Oaxaca, Mexico. Three transects were walked to search for tracks, catches of organisms, sightings, and phototrapping from September 2007 to August 2008. There were recorded 15 species of 6 orders, 11 families, and 14 genera, 7 of this not previously known in the region. The most abundant species were Nasua narica, Pecari tajacu, Dasyprocta mexicana, Cuniculus paca, and Leopardus pardalis. Despite the low value of the diversity index compared with similar studies, the presence of species considered at risk by the Mexican law as L. pardalis, L. wiedii, Eira barbara, and Tamandua mexicana make the area valuable for the conservation of the diversity of the region.
área de actividad y movimientos de Liomys irroratus (Rodentia: Heteromyidae) en una selva mediana de Tuxtepec, Oaxaca, México Activity area and movements of Liomys irroratus (Rodentia: Heteromyidae) in semideciduos tropical forest of Tuxtepec, Oaxaca, Mexico
Antonio Santos-Moreno,Aremi E Santiago-Marcial
Revista mexicana de biodiversidad , 2012,
Abstract: Se estimaron los movimientos y el área de actividad del ratón Liomys irroratus en una selva mediana del sureste del estado de Oaxaca, México. Los machos presentaron áreas de actividad más grandes que las hembras (126 m2 vs. 21.1); asimismo, en la temporada seca las áreas fueron mayores que en la de lluvias, pero en este caso las diferencias no fueron estadísticamente significativas. El tama o promedio anual de área de actividad para todos los individuos de la población se estimó en 87.48 m2. Los machos no presentaron superposición de sus áreas de actividad con otros machos, y fue baja tanto entre hembras como entre individuos de sexos diferentes. Los machos tendieron a recorrer distancias promedio más grandes que las hembras (69.31 m vs. 33). En la temporada de lluvias los individuos se movieron significativamente más que en la seca (58.12 m vs. 44.19). El tama o de las áreas de actividad de las hembras mostró una correlación estadísticamente significativa e inversa con el número de árboles y el de arbustos, y en estas áreas el número de oquedades y las pendientes son mayores que en las de los machos. Los resultados permiten suponer que la especie tiene un sistema de apareamiento de poligamia, manteniendo su territorio hasta que inicia la temporada reproductiva. We estimated the movements and activity area of the spiny pocket-mice Liomys irroratus in a semideciduos tropical forest at the southeastern of the state of Oaxaca, Mexico. Males have larger activity areas than females (126 m2 vs. 21.1), also, in the rainy season these were higher than in the dry season, but in this case the differences were not statistically significant. The annual average size of the activity area for all individuals in the population was of 87.48 m2. Males showed no overlap in their activity areas with other males, while between females and between members of different sexes this was low. Males showed average travel distances larger than females (69.31 m vs. 33). In the rainy season individuals moved significantly more than in the dry season (58.12 m vs. 44.19). The size of activity areas of the females showed a significant and inverse correlation with the number of trees and shrubs, and these areas had higher number of cavities and greater slope that those occupied by males. The results suggest that the species has a polygamous breeding system, where the territory is held until the beginning of the breeding season.
Determinación del dimorfismo sexual secundario en la guacamaya verde (Ara militaris): complementariedad morfométrica e índice ocular
BONILLA-RUZ, Carlos;CINTA MAGALLóN, Claudia;SANTOS-MORENO, Antonio;
Acta zoológica mexicana , 2011,
Abstract: most american psittacids do not show sexual dimorphism. finding differences between sexes allows getting practical biological information about populations of threatened or endangered species. this work shows the significant results of a morphometric study to indicate significant secondary sexual differences on ara militaris. the hypothesis tested on this analysis is that there are secondary sexual differences on this species that can be visually detected; we show that the size and proportions and layout of certain parts of the head can be used consistently and reliably to differentiate males from females. to test the hypothesis, we used 18 specimens in captivity, 15 of them sexed by dna analysis (11 females, 4 males plus 3 of unknown sex). we used 11 measurements taken from pictures of the head of each specimen from different parts of the head. a principal components analysis was performed and most significant measurements were identified from these results, therefore an ocular index was built. the ocular index correlates two involved characteristics in the ocular area of the bird, providing information to make an easy differentiation of the sexes. predictions made with this ocular index matched the dna results; the sex from the three unidentified specimens was predicted by using the index. the results represent a very practical, complementary, and inexpensive way to differentiate sex among these birds for field management and monitoring purposes.
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