Density-dependent patterns of multivariate selection on sperm motility and morphology in a broadcast spawning mussel

ID = male ID; Block = block number; Treatment: H (high density fertilisation treatment) or L (low density fertilisation treatment); Fert: number of normally developed embryos out of 200; motilecount = number of motile sperm tracked; ALH = amplitude of lateral head movement; BCF = beat-cross frequency; LIN = linearity; STR = straightness; VAP = average-path velocity; VCL = curvilinear velocity; VSL = straight-line velocity; PM = percentage of motile sperm in sample; HW AVE = average sperm head width; AC AVE = average length of acrosomal cap; HL AVE = average sperm head length; FL AVE = average sperm flagellum length; TL AVE = total sperm length. Some individuals are missing values for either sperm motility or morphological measurements and were removed from analayses.