| batrachotoxin alkaloids from passerine birds: a second toxic bird genus (ifrita kowaldi) from new guinea. | batrachotoxins, including many congeners not previously described, were detected, and relative amounts were measured by using hplc-mass spectrometry, in five species of new guinean birds of the genus pitohui as well as a species of a second toxic bird genus, ifrita kowaldi. the alkaloids, identified in feathers and skin, were batrachotoxinin-a cis-crotonate (1), an allylically rearranged 16-acetate (2), which can form from 1 by sigmatropic rearrangement under basic conditions, batrachotoxinin-a ... | 2000 | 11035772 |
| phylogenetic evidence for colour pattern convergence in toxic pitohuis: müllerian mimicry in birds? | bird species in the genus pitohui are chemically defended by a potent neurotoxic alkaloid in their skin and feathers. the two most toxic pitohui species, the hooded pitohui (pitohui dichrous) and the variable pitohui (pitohui kirhocephalus), are sometimes strikingly patterned and, in certain portions of their geographical ranges, both species share a nearly identical colour pattern, whereas in other areas they do not. müllerian mimicry (the mutual resemblance of two chemically defended prey spec ... | 2001 | 11571042 |
| gene flow in the müllerian mimicry ring of a poisonous papuan songbird clade (pitohui; aves). | müllerian mimicry rings are remarkable symbiotic species assemblages in which multiple members share a similar phenotype. however, their evolutionary origin remains poorly understood. although gene flow among species has been shown to generate mimetic patterns in some heliconius butterflies, mimicry is believed to be due to true convergence without gene flow in many other cases. we investigated the evolutionary history of multiple members of a passerine mimicry ring in the poisonous papuan pitoh ... | 2019 | 31418795 |