Sperm in competition: not playing by the numbers.

By Rhonda R. Snook. Trends in Ecology & Evolution, 2005

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Sperm number and velocity affect sperm competition success in the guppy (Poecilia reticulata) (2011, background): “Firman and Simmons 2008b) and interspecific (Fitzpatrick et al. 2009; Kleven et al. 2009; Snook 2005) comparisons, showing that increased sperm number and velocity are usually associated with increasing levels of sperm competition.”
Paternity in mallards: Effects of sperm quality and female sperm selection for inbreeding avoidance (2005, result): “The results of the present study emphasize the importance of sperm quality for fertilization success (Snook, 2005).”
Copulation duration, insemination efficiency and male attractiveness in guppies (2007, background): “A sperm competition study using artificial insemination of different sperm numbers would allow the relative importance of sperm number in determining fertilization success to be measured (Snook 2005).”
Factors predicting male fertilization success in an external fertilizer (2008, background): “Competition between sperm from different males is often observed and was early recognized as an important postcopulatory factor influencing fertilizations (Parker 1970; for review see Birkhead and Møller 1998; Simmons 2001; Snook 2005).”
Sperm quantity and quality effects on fertilization success in a highly promiscuous passerine, the tree swallow Tachycineta bicolor (2010, background): “through increased sperm production, sperm motility and sperm size (e.g. Parker 1998; Snook 2005).”