XXY, algo más que dos sexos

Latitudinal clines in sex ratio, bill, and wing length in Least Sandpipers

Differential distribution of nonbreeding Least Sandpipers (Calidris minutilla) according to sex, bill, and wing length was documented using capture data from six locations between California and Ecuador. The distribution of age classes did not vary with latitude. Females, which are slightly larger than males, migrated further south. Wing length increased toward the south for both males and fema...

Bill Shape and Sexual Shape dimorphiSm Between two SpecieS of temperate hummingBirdS: Black-chinned hummingBird (Archilochus AlexAndri) and ruBy-throated hummingBird (A. colubris)

Resumen.—El dimorfismo sexual en el tamaño se presenta a través del reino animal, y sus causas e implicancias ecológicas y evolutivas han sido intensamente estudiadas. Las diferencias específicas de los sexos en la curvatura del pico son conocidas en varias especies des aves, incluyendo algunos picaflores tropicales. A pesar de la importancia de la forma del pico para forrajear, los estudios co...

A Evolução, a Situação Atual e a Tendência de Alguns Itens que Influenciam a Qualidade dos Processos e dos Produtos e Também o Nível de Exigência dos Consumidores

O objetivo princzpal deste artigo e" fer com que todos, sejam os acade^micos ou Os empresa rios ou aLnda os consumz.dores, compreendam o cena"rz-o atual e possam ter, pelo menos, uma percep50 minx'ma dos rumos qu_e as empresas, as tecnoLogz"as e o mercado consumidor tonzara-o nos pr6xz"mos anos. Para aLcanor o obj~etino deste artigo, mostra-Se o resultado de um estudo onde e" avaliado como as e...

Relationships between tail - flicking , morphology , and body condition in Moorhens

Prey-predator communication of alertness has been reported for Moorhens (Gallinula chloropus) and other species of birds. Because ability to flee is probably related to body condition, healthy potential prey may behave more conspicuously to send predators an unambiguous message. Moorhens have a contrasting rump patch that is flashed by rapid tail-flicking. During two winter months, we observed ...

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