Search results for "Parental age"
showing 3 items of 3 documents
Aging parasites produce offspring with poor fitness prospects.
2017
Senescing individuals have poor survival prospects and low fecundity. They can also produce offspring with reduced survival and reproductive success. We tested the effect of parental age on the performance of descendants in the nematode Heligmosomoides polygyrus , an intestinal parasite of rodents. We found that offspring of senescing worms had reduced within-host survival and reduced egg shedding over the first month post-infection compared with offspring produced by young parents. These results suggest that declining offspring quality is a component of senescence in parasitic nematodes and might have evolutionary consequences for the optimal schedule of age-dependent investment into repr…
Parental agency and related emotions in the educational partnership
2017
This study investigated the understudied issue of parental agency and related emotions in the educational partnership in the context of Finnish early childhood education and care. We asked (i) what types of parental agency can be identified in the educational partnership and (ii) in what ways emotions are related to these types of agency. The narrative method was used to analyse the interview data of parents of children with difficulties in self-regulation. The findings indicate that parental agency in the educational partnership varied from proactive and confrontational to hindered. Typically, pleasant emotions were related to proactive and unpleasant emotions to confrontational parental a…
Data from: Aging parasites produce offspring with poor fitness prospects
2017
Senescing individuals have poor survival prospects and low fecundity. They can also produce offspring with reduced survival and reproductive success. We tested the effect of parental age on the performance of descendants in the nematode Heligmosomoides polygyrus, an intestinal parasite of rodents. We found that offspring of senescing worms had reduced within-host survival and reduced egg shedding over the first month post-infection compared with offspring produced by young parents. These results suggest that declining offspring quality is a component of senescence in parasitic nematodes and might have evolutionary consequences for the optimal schedule of age-dependent investment into reprod…