A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Asymmetries in reproductive anatomy : insights from promiscuous songbirds (2019)
Calhim, S., Pruett-Jones, S., Webster, M. S., & Rowe, M. (2019). Asymmetries in reproductive anatomy : insights from promiscuous songbirds. Biological Journal of the Linnean Society, 128(3), 569-582. https://doi.org/10.1093/biolinnean/blz100
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Calhim, Sara; Pruett-Jones, Stephen; Webster, Michael S.; Rowe, Melissah
Lehti tai sarja: Biological Journal of the Linnean Society
ISSN: 0024-4066
eISSN: 1095-8312
Julkaisuvuosi: 2019
Volyymi: 128
Lehden numero: 3
Artikkelin sivunumerot: 569-582
Kustantaja: Oxford University Press
Julkaisumaa: Britannia
Julkaisun kieli: englanti
DOI: https://doi.org/10.1093/biolinnean/blz100
Julkaisun avoin saatavuus:
Julkaisukanavan avoin saatavuus:
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/66466
Tiivistelmä
Directional asymmetry in gonad size is commonly observed in vertebrates and is particularly pronounced in birds, where the left testis is frequently larger than the right. The adaptive significance of directional asymmetry in testis size is poorly understood, and whether it extends beyond the testes (i.e. side-correspondent asymmetry along the reproductive tract) has rarely been considered. Using the Maluridae, a songbird family exhibiting variation in levels of sperm competition and directional testis asymmetry, yet similar in ecology and life history, we investigated the relative roles of side-correspondence and sperm competition on male reproductive tract asymmetry at both inter- and intraspecific levels. We found some evidence for side-correspondent asymmetry. Additionally, sperm competition influenced directional asymmetry at each end of the reproductive tract: species experiencing higher levels of sperm competition had a relatively larger right testis and relatively more sperm in the right seminal glomerus. Within red-backed fairy-wrens (Malurus melanocephalus), auxiliary males had relatively more sperm in the left seminal glomerus, in contrast to a right-bias asymmetry throughout the reproductive tract in breeding males. Given that the number of sperm is important for competitive fertilization success, our results suggest that sperm competition shapes reproductive asymmetries beyond testis size, with likely functional consequences for male reproductive success.
YSO-asiasanat: lisääntymiskäyttäytyminen; anatomia; asymmetria; kivekset; siittiöt; varpuslinnut
Vapaat asiasanat: Maluridae; reproductive evolution; sperm competition; testis size
Liittyvät organisaatiot
OKM-raportointi: Kyllä
VIRTA-lähetysvuosi: 2019
JUFO-taso: 1