Bananaquit biogeography

Article Abstract:

The study of bananaquit populations, a bird found on the Central and South American mainlands and islands, using molecular methods shows that different populations of the same species may be in different stages of colonization at the same time. The study of intraspecific relations between different populations using morphological traits has certain disadvantages which are overcome by the molecular method. The study also shows that dispersal ability depends on natural selection and genetic make-up of the animals.

Research, Genetic aspects, Natural selection, Biogeography

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A-bombs against amphibians

Article Abstract:

Populations of Taricha torosa, more commonly known as the California newt, are rapidly disappearing because of two predators introduced into its habitat. T. torosa normally thwarts native predators with its tetrodotoxin-containing body. Its larvae, encased in gelatINNus capsules, are also able to detect chemical signs of approaching predators. Laboratory and field tests show, however, that larval newts fail to recognize the chemical cues sent out by crayfish and mosquitofish and are thus unable to flee.

Analysis, Environmental aspects, Predation (Biology), Newts

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Rubbish birds are poisonous

Article Abstract:

Birds that protect themselves against predation by exuding a poison have been discovered in New Guinea. J.P. Dumbacher and coworkers identified three species of the genus Pitohui as producing the steroidal alkaloid homobatrachotoxin, a powerful neuromuscular poison. Moreover, these birds give off a strongly bitter smell that warns potential predators to avoid them. Researchers have also found evidence that other New Guinea birds may protect themselves by mimicking the Pitohui birds' coloration.

Health aspects, Natural history, Identification and classification, Birds, Poisonous animals, New Guinea

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