Počet záznamů: 1
Variation in sperm morphology among Afrotropical sunbirds
- 1.0457923 - UBO-W 2017 RIV GB eng J - Článek v odborném periodiku
Omotoriogun, T. C. - Laskemoen, T. - Rowe, M. - Albrecht, Tomáš - Bowie, R. C. K. - Sedláček, O. - Hořák, D. - Ottosson, U. - Lifjeld, J. T.
Variation in sperm morphology among Afrotropical sunbirds.
Ibis. Roč. 158, č. 1 (2016), s. 155-166. ISSN 0019-1019
Institucionální podpora: RVO:68081766
Klíčová slova: comparative analysis * Nectariniidae * phylogenetic signal * sperm competition * sperm size
Kód oboru RIV: EG - Zoologie
Impakt faktor: 2.279, rok: 2016
Birds show considerable variation in sperm morphology. Closely related species and subspecies can show diagnostic differences in sperm size. There is also variation in sperm size among males within a population, and recent evidence from passerine birds suggests that the coefﬁcient of inter-male variation in sperm length is negatively associated with the level of sperm competition. Here we examined patterns of inter- and intra-speciﬁc variation in sperm length in 12 species of sunbird (Nectariniidae) from Nigeria and Cameroon, a group for which such information is extremely limited. We found signiﬁcant variation among species in sperm total length, with mean values ranging from 74 micrometre to 116 micrometre, placing these species within the short to medium sperm length range for passerine birds. Most of this variation was explained by the length of the midpiece, which contains the fused mitochondria and is an important structure for sperm energetics. Relative midpiece length was negatively correlated with the coefﬁcient of inter-male variation in sperm total length across species, suggesting that sperm competition may have selected for greater midpiece length in this group. We also mapped sperm lengths onto a time-calibrated phylogeny and found support for a phylogenetic signal in all sperm length components, except head length. A test of various evolutionary or tree transformation models gave strongest support for the Brownian motion model for all sperm components, i.e. divergences were best predicted by the phylogenetic distance between lineages. The coefﬁcients of inter-male variation in sperm total length indicate that sperm competition is high but variable among sunbird species, as is the case with passerine birds at large.
Trvalý link: http://hdl.handle.net/11104/0258265