نتایج جستجو برای: avifauna
تعداد نتایج: 984 فیلتر نتایج به سال:
– Over the last 30 years, sexual selection has become one of the most influential and rapidly growing areas within evolutionary biology and behavioral ecology. Sexual selection has important effects on the evolution of life history traits, mating systems and morphology, and also has been suggested as a factor that promotes speciation. Avian systems have played an essential role as models in the...
Aim Species belonging to higher taxa endemic to islands are more likely to go extinct following human arrival. This selectivity may occur because more highly endemic island species possess features that make them uniquely vulnerable to impacts associated with human arrival, specifically: (1) restricted distribution (2) reduced predator escape response, including loss of flight, and (3) life his...
Avifaunas de dos bosques secos del norte Oaxaca, MéxicoSe realizaron inventarios avifaunísticos en el sitios la región Cañada Valle Tehuacán. Se observaron 142 especies aves, encontrándose cerca 100 cada sitio. encontró un número sorprendente (37) que representan poblaciones aisladas interior restringidas por una u otra vertiente costera. Además, proporciones similares fueron exclusivamente cos...
BACKGROUND During the last decade, new Neogene fossil assemblages from South America have revealed important clues about the evolution of seabird faunas in one of the major upwelling systems of the world: the Humboldt Current. However, most of this record comes from arid Northern Chile and Southern Peru and, in consequence, our knowledge of the evolutionary history of seabirds in the temperate ...
Rasmussen, D. Tab, Storrs L. Olson, and Elwyn L. Simons. Fossil Birds from the Oligocene Jebel Qatrani Formation, Fayum Province, Egypt. Smithsonian Contributions to Paleobiology, number 62, 20 pages, 15 figures, 1986.—^Fossils from fluvial deposits of early Oligocene age in Egypt document the earliest known diverse avifauna from Africa, comprising at least 13 families and 18 species. Included ...
Registramos a la guacamaya verde (Ara militaris) en algunas localidades de Sierra Madre del Sur Guerrero. Aunque esta especie está considerada avifauna estatal, no existían registros su presencia los últimos 20 años. Las fechas registro sugieren posibilidad que grupos observados podrían haber estado formados por adultos y juveniles zona sea un sitio reproducción. Sugerimos continuar con estudio...
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