Sperm polymorphism within the sea urchin Strongylocentrotus droebachiensis: divergence between Pacific and Atlantic Oceans. The Biological Bulletin | October 1, 2008| | COPYRIGHT 2008 Marine Biological Laboratory. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

Introduction

Current theory on variation in sperm morphology focuses on male-female co-evolution and male-male competition. Sperm competition has emerged as an important selective force in shaping sperm quality in snakes (Tourmente et al., 2006), mammals (Gomendio et al., 2006), and insects (Birk-head and Pizzari, 2002; Hunter and Birkhead, 2002; Pattarini et al., 2006). Sperm morphology has been correlated with mating system (Rouse and Jamieson, 1987), fertilization biology (polychaetes, Franzen, 1956; molluscs, Ribes et al., 2002; Oppliger et al., 2003; mammals, ...

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