We have studied the effect of habitat and presence of conspecifics on echolocation characteristics of the emballonurid bat Balantiopteryx plicata. Calls during the search phase only showed ...differences between habitats in bandwidth, as has been found for other open-space bats. Characteristics of calls during the approach phase did change when bats entered open areas. Calls in the terminal phase showed no differences in the characters examined between habitats. Bats flying in groups shifted their peak frequency significantly, which maximized differences between individuals. These results are interpreted as an active mechanism of jamming avoidance. Bats flying in groups also tended to increase the mean of peak frequencies.
We have studied the effect of habitat and presence of conspecifics on echolocation characteristics of the emballonurid bat Balantiopteryx plicata. Calls during the search phase only showed ...differences between habitats in bandwidth, as has been found for other open-space bats. Characteristics of calls during the approach phase did change when bats entered open areas. Calls in the terminal phase showed no differences in the characters examined between habitats. Bats flying in groups shifted their peak frequency significantly, which maximized differences between individuals. These results are interpreted as an active mechanism of jamming avoidance. Bats flying in groups also tended to increase the mean of peak frequencies.
We describe and compare field recordings of echolocation calls of the neotropical emballonurid sac-winged bats Balantiopteryx plicata, B. io, and B. infusca. These 3 species have search-phase calls ...with principal energy in the 2nd harmonic, characterized by a long narrowband component followed by a short broadband component. Variation in call parameters follows only partially the scaling pattern with body size generally found in bats. Based on characteristics of their echolocation calls, we hypothesize that B. io and B. infusca forage in more cluttered habitats than does the congeneric B. plicata, which typically hunts in open areas.
Chromosomal material from 76 specimens of Osgoodomys banderanus collected in 22 different localities was studied. The revised material was obtained from femur bone marrow from individuals which were ...previously injected with colchicine. A minimum of 10 mitotic fields were studied for each specimen. A number 2n=48 was found for all the studied specimens. 3 different fundamental numbers and 4 different cytotypes were found 3 of them are not registered yet. Geographical distribution for each cytotype is presented. The G banding pattern was obtained and a cladogram with the possible chromosomal changes is presented.
We describe and compare field recordings of echolocation calls of the neotropical emballonurid sac-winged bats Balantiopteryx plicata, B. io, and B. infusca. These 3 species have search-phase calls ...with principal energy in the 2nd harmonic, characterized by a long narrowband component followed by a short broadband component. Variation in call parameters follows only partially the scaling pattern with body size generally found in bats. Based on characteristics of their echolocation calls, we hypothesize that B. io and B. infusca forage in more cluttered habitats than does the congeneric B. plicata, which typically hunts in open areas.
La información actualizada sobre la representatividad geográfica y taxonómica de los ejemplares depositados en 28 colecciones mastozoológicas mexicanas y la disponible en las bases de datos Mammal ...Networked Information System (MaNIS), y de la Unidad de Informática para la Biodiversidad (UNIBIO) se recopiló con el fin de analizar y comparar el estado actual de los ejemplares de mamíferos mexicanos depositados en colecciones de Norteamérica. Se documentaron un total de 421,466 ejemplares de mamíferos depositados en 120 colecciones mastozoológicas, de los cuales 233,116 ejemplares se encuentran en colecciones de Estados Unidos de América y Canadá, y 188,350 ejemplares en colecciones de México. Las colecciones con el mayor número de ejemplares de mamíferos de México son la Colección Nacional de Mamíferos (CNMA 46,000), la Universidad de Kansas (KU 44,301), y la Escuela Nacional de Ciencias Biológicas (ENCB 43,985). En colecciones mexicanas, los estados del norte de México están escasamente representados en número de ejemplares (< 3,000), y en las colecciones extranjeras, los estados del centro de México están pobremente representados. Los estados mexicanos mejor representados por número de ejemplares (> 10,000) son Baja California Sur, Chiapas, Oaxaca, Puebla y Veracruz. Los órdenes mejor representados por el número de ejemplares son Rodentia y Chiroptera (234,978 y 120,956, respectivamente). Los estados mexicanos con menor extensión territorial tienen la mayor densidad de ejemplares colectados (ejemplares/km²): Distrito Federal (3.2), Tlaxcala (1.4), Colima (1.06) y Morelos (0.9). Se espera contar con una línea base que permita establecer estrategias adecuadas para completar el inventario nacional de los mamíferos mexicanos, y lograr que este patrimonio natural este adecuadamente representado en colecciones de México.
Chromosomal material from 76 specimens of Osgoodomys banderanus collected in 22 different localities was studied. The revised material was obtained from femur bone marrow from individuals which were ...previously injected with colchicine. A minimum of 10 mitotic fields were studied for each specimen. A number 2n=48 was found for all the studied specimens. 3 different fundamental numbers and 4 different cytotypes were found 3 of them are not registered yet. Geographical distribution for each cytotype is presented. The G banding pattern was obtained and a cladogram with the possible chromosomal changes is presented.
Noteworthy records of mammals from Michoacán, México Sánchez-Hernández, Cornelio; Roméro-Almaraz, María de Lourdes; Owen, Robert D. ...
The Southwestern naturalist,
06/1999, Letnik:
44, Številka:
2
Journal Article
Recenzirano
Se aporta información para 11 especies de mamíferos del estado de Michoacán, sobre distribución, medidas, aspectos reproductores y hábitat. Siete especies son nuevos registros y representan el 4.3% ...de las 163 especies conocidas. Peropteryx macrotis y Glossophaga commissarisi amplían su distribución en aproximadamente 400 km. Las localidades de captura de Glossophaga leachii demuestran que tiene una amplia distribución en el centro-sur del estado. Cuatro registros se basan en un especimen, to que muestra que aún es poco to que se conoce sobre los mamíferos de este estado.
PDF
