There is also evidence for a positive relationship between the degree of reproductive constraint and the expression of secondary reproduction - in a study of the semelparous Eresid spider Stegodyphus lineatus, Schneider et al. also artificially restricted primary reproduction [ 19], but did so at different times – either at two or ten days after hatching.
Fertilization success is the major reproductive constraint, particularly in small populations, and probably reflects a self-incompatible reproductive strategy.
We show that group benefits are strongly affected by variance in foraging success within a reproductive season, constraints on reproduction determined by the reproduction threshold, and investment in offspring production after passing this threshold.
Despite the large livestock population of Ethiopia the economic benefits remain marginal due to prevailing diseases, poor nutrition, poor animal production systems, reproductive inefficiency management constraint and general lack of Veterinary core [ 4].
As a result of constraints on reproductive function, most vertebrate clades show a high phylogenetic conservatism in reproductive mode.
They also highlight the considerable difficulties in obtaining suitable data, the ideal being a multigenerational study with a known pedigree and paternities, without strong cultural constraints on reproductive success [ 52].
The observations here provide a parallel to the observations of ecotypes with additional loss-of-function mutations at one or more SI-modifier genes after the evolutionary switch to autogamy in the Arabidopsis thaliana lineage [ 32], but is the first time low selective constraints of reproductive proteins associated with the switch to homothallism has been reported from fungi.
In spite of continuous global investments in adolescent sexual and reproductive health (ASRH) programmes, constraints such as limited knowledge and lack of access to resources as well as services still exist in effectively meeting the ASRH information and service needs of adolescents.
Second, that the lack of a corresponding increase in female reproductive lifespan reflects evolutionary constraint on late-life oocyte production.
