caa a22 4500 465782817 CHVBK 20180323112000.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00164003 doi (NATIONALLICENCE)springer-10.1007/BF00164003 Mechanisms of sperm competition in birds: mathematical models [Elektronische Daten] [C. Lessells, T. Birkhead] Summary: We built models of sperm competition and compared their predictions with observations from domestic chickens in an attempt to elucidate the mechanism of sperm competition. The models suggest that (1) observed levels of precedence of sperm are not merely a passive consequence of the greater mortality of sperm from earlier inseminations; (2) displacement of existing sperm from sperm storage tubules by incoming sperm explains observed levels of sperm precedence and disappearance from the reproductive tract, even in the absence of recognition of sperm from different inseminations; (3) stratification of sperm within the sperm storage tubules fails as an explanation of observed patterns of sperm precedence and disappearance because long-term levels of sperm precedence as high as those observed can only be predicted in combination with rates of disappearance of sperm much lower than those observed in chickens. The predictions of sperm precedence levels following multiple inseminations also suggest that displacement rather than stratification is the most likely mechanism of sperm competition in chickens. We discuss the consequences of male or female control of sperm competition, non-uniform distribution of sperm between sperm storage tubules, and variation in sperm precedence with time after the last insemination, and suggest ways in which the models may be used in future to aid in the elucidation of mechanisms of sperm competition. Springer-Verlag, 1990 Lessells C. Department of Animal and Plant Sciences, University of Sheffield, S10 2TN, Sheffield, UK aut Birkhead T. Department of Animal and Plant Sciences, University of Sheffield, S10 2TN, Sheffield, UK aut Behavioral Ecology and Sociobiology Springer-Verlag 27/5(1990-09-01), 325-337 0340-5443 27:5<325 1990 27 265 https://doi.org/10.1007/BF00164003 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00164003 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lessells C. Department of Animal and Plant Sciences, University of Sheffield, S10 2TN, Sheffield, UK aut NATIONALLICENCE 700 1- Birkhead T. Department of Animal and Plant Sciences, University of Sheffield, S10 2TN, Sheffield, UK aut NATIONALLICENCE 773 0- Behavioral Ecology and Sociobiology Springer-Verlag 27/5(1990-09-01), 325-337 0340-5443 27:5<325 1990 27 265 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer