caa a22 4500 465782426 CHVBK 20180323111959.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF00183314 doi (NATIONALLICENCE)springer-10.1007/BF00183314 Analysing sperm competition data: simple models for predicting mechanisms [Elektronische Daten] [G. Parker, L. Simmons, H. Kirk] Summary: Prospective models are developed for analysing sperm competition data so as to predict the underlying mechanisms determining paternity in multiply mated females. The models require: 1) estimations of proportion of offspring sired by the last male to mate (P 2), 2) knowledge of the number of sperm transferred by each male, and 3) knowledge of the sperm storage capacity of the female, should this be limited. They will distinguish between "raffles” (sperm mixing without displacement) and sperm displacement mechanisms. The sensitivity of the techniques can be increased by manipulating the number of sperm transferred by each male. Typically, this can be done by manipulating copula duration or number of ejaculations, given a knowledge of the rate of sperm transfer. Data from two contrasting insect species are fitted to the models to demonstrate the techniques. These models are prospective only, and their limitations are discussed. The principal limitation is that we assume that sperm used for fertilization mix randomly in a "fertilization set” immediately prior to fertilization; in reality this may be difficult to identify. When sperm mixing is very rapid, the fertilization set will often be equivalent to the sperm stores, but with slow mixing, the fertilization set may be equivalent to a much more restricted zone and may change with time. Springer-Verlag, 1990 Parker G. Department of Environmental and Evolutionary Biology, University of Liverpool, L69 3BX, UK aut Simmons L. Department of Environmental and Evolutionary Biology, University of Liverpool, L69 3BX, UK aut Kirk H. Department of Environmental and Evolutionary Biology, University of Liverpool, L69 3BX, UK aut Behavioral Ecology and Sociobiology Springer-Verlag 27/1(1990-07-01), 55-65 0340-5443 27:1<55 1990 27 265 https://doi.org/10.1007/BF00183314 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00183314 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Parker G. Department of Environmental and Evolutionary Biology, University of Liverpool, L69 3BX, UK aut NATIONALLICENCE 700 1- Simmons L. Department of Environmental and Evolutionary Biology, University of Liverpool, L69 3BX, UK aut NATIONALLICENCE 700 1- Kirk H. Department of Environmental and Evolutionary Biology, University of Liverpool, L69 3BX, UK aut NATIONALLICENCE 773 0- Behavioral Ecology and Sociobiology Springer-Verlag 27/1(1990-07-01), 55-65 0340-5443 27:1<55 1990 27 265 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer