One exception was an individual mouse from a locality in Western Austria Silz: Some authors question the utility or physiologic basis of this pattern of classification. Success of classification of mice into Mmd or Mmm as predicted by discriminant function was compared to subspecific origin as assessed by genetic analysis. Individual wild-derived strains are marked separately on the left side of the graphs while subspecies-specific strains are put together on the right side of the graphs. A Relationships between sperm morphometry and sperm motility in the Atlantic salmon.
Sperm morphology and sperm velocity in passerine birds
The dorsal curvature defined by landmarks 4, 5 and 6 was more flattened in longer heads, and the ventral outline through landmarks 10, 11, 12 and 1 tended to be straight Fig. Assessment of fertility and fecundity. The effects of cryopreservation on the morphometric dimensions of caprine sperm heads. P , Yeates S , Ward R. To this end, we compared methods currently used in sperm morphometry i. Likewise, in cichlid fishes, Fitzpatrick et al. BMC Genomics ;
Sperm morphology in the Malagasy rodents (Muroidea: Nesomyinae) | Request PDF
Individual wild-derived strains are marked separately on the left side of the graphs while subspecies-specific strains are put together on the right side of the graphs. Bonferroni post-hoc tests revealed differences in sperm head dimensions-derived parameters between species Table S5. Marked interspecific differences were found to occur in both the form of the sperm head and length of the tail. Cell Motil Cytoskeleton Variation in sperm form in rats and mice subfamily Murinae. We observed that major differences between species were present at the insertion point of the flagellum, the point of inflexion of the ventral side of the head defined by landmark 10 , the area of dorsal curvature defined by landmarks 4, 5 and 6, and hook shape and curvature. Bend propagation in the flagella of migrating human sperm, and its modulation by viscosity.
Removing the effect of size on sperm head differences, we managed to observe that differences could be identified in several anatomical features of the sperm head: When individual strains were compared separately, variation in most traits could be partitioned into more detailed differentiation. The results showed that the variance due to landmark digitization is lower than the variance explained by shape differences between individuals Table S1. Thus, Spag6 appears to be important for maintaining the architecture of the central apparatus of sperm after their release from the testis. In the present study we explored whether geometric morphometrics is a more detailed and accurate approach to quantify size and shape differences in rodent sperm heads.