The influence of male part body size and mate competition on fertilization success and effective population size in Atlantic salmon

Article Abstract:

The influence of mate competition and male part body size on effective population size and fertilization success have been studied in Atlantic salmon. Highly variable microsatellite loci were used to assign paternity. Reproductive success by mature mall parr raises the effective number of males, but the increase seems likely to be most pronounced in natural populations when the number of anadromous males is low. Not all nests were sampled, and a proxy for lifetime reproductive success was used, so estimates of N(sub.e) should not be taken to be absolute, and a downward bias may exist.

Atlantic Ocean, Methods, Sexual behavior in animals, Animal sexual behavior, Atlantic salmon, Genetic research

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Effects of maternal age on larval competitiveness in house flies

Article Abstract:

Maternal age and its effects on house fly larval competitiveness have been studied. Maternal age effects were fond to be line-specific, suggesting they are determined genetically. Significant interactions of maternal age effects were found in pairwise line comparisons. Maternal age effects on performance in pure culture were of each line and maternal age class. It appears that use of tester strains to determined relative competitiveness of lines or maternal age classes is not valid.

Aging, Physiological aspects, Larvae, Housefly

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Intraspecific variation in sperm size characters

Article Abstract:

Intraspecific variation in sperm size characters is discussed with the information that this variation may be widespread. Genetic determination of sperm size is substantial with determinants in some cases sex-linked.

Switzerland, Genetic aspects, Variation (Biology), Spermatozoa, Sperm

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