Interspecific variation in egg testosterone levels: implications for the evolution of bird song
  • Metaadatok
Tartalom: http://dx.doi.org/10.1111/j.1420-9101.2007.01309.x
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published



Type = Article
Cím:
Interspecific variation in egg testosterone levels: implications for the evolution of bird song
Létrehozó:
Garamszegi, László Zsolt
Biard, C.
Eens, M.
Moller, A. P.
Saino, N.
Kiadó:
Wiley-Blackwell
Dátum:
2007
Téma:
QH301 Biology / biológia
QH426 Genetics / genetika, örökléstan
QH540 Ecology / ökológia
QL Zoology / állattan
Tartalmi leírás:
Although interspecific variation in maternal effects via testosterone levels can be mediated by natural selection, little is known about the evolutionary consequences of egg testosterone for sexual selection. However, two nonexclusive evolutionary hypotheses predict an interspecific relationship between egg testosterone levels and the elaboration of sexual traits. First, maternal investment may be particularly enhanced in sexually selected species, which should generate a positive relationship. Secondly, high prenatal testosterone levels may constrain the development of sexual characters, which should result in a negative relationship. Here we investigated these hypotheses by exploring the relationship between yolk testosterone levels and features of song in a phylogenetic study of 36 passerine species. We found that song duration and syllable repertoire size were significantly negatively related to testosterone levels in the egg, even if potentially confounding factors were held constant. These relationships imply that high testosterone levels during early development of songs may be detrimental, thus supporting the developmental constraints hypothesis. By contrast, we found significant evidence that song-post exposure relative to the height of the vegetation is positively related to egg testosterone levels. These results support the hypothesis that high levels of maternal testosterone have evolved in species with intense sexual selection acting on the location of song-posts. We found nonsignificant effects for intersong interval and song type repertoire size, which may suggest that none of the above hypothesis apply to these traits, or they act simultaneously and have opposing effects.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Garamszegi, László Zsolt and Biard, C. and Eens, M. and Moller, A. P. and Saino, N. (2007) Interspecific variation in egg testosterone levels: implications for the evolution of bird song. Journal of Evolutionary Biology, 20 (3). pp. 950-964. ISSN 1010-061X (print), 1420-9101 (online)
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