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Experimental cross-fostering of eggs reveals effects of territory quality on reproductive allocation.

ABSTRACT: Parental and territory quality are often correlated in territorial birds, and both factors influence the resources allocated to offspring. Surprisingly, the relative contribution of these two components of variation in parental investment remains obscure. We experimentally decoupled the normal covariation between parental quality and territory quality to test the hypothesis that territory quality influences female prenatal and postnatal reproductive allocation. Territories were categorized into low-, intermediate-, and high-quality based on fledging success of nests over the previous 6 years (nesting sites are fixed in space).To decouple covariation between territory quality and individual quality, nestbox entrance size was increased on high-quality territories and left small on poor-quality sites because house wrens (Troglodytes aedon) prefer small over large entrances to their nest sites. We found a significant prenatal effect of territory quality on nestling provisioning: when reared on intermediate-quality territories, nestlings hatching from eggs produced on low-quality territories were provisioned at a higher rate than those hatching from eggs produced on high-quality territories. We propose that the increased provisioning was brought about by increased nestling begging mediated by a maternally derived compound, such as corticosterone, transferred to the eggs of stressed females in poor-quality habitat.

SUBMITTER: Poorboy DM

PROVIDER: S-EPMC6129948 | biostudies-literature | 2018 Sep-Oct

REPOSITORIES: biostudies-literature

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Experimental cross-fostering of eggs reveals effects of territory quality on reproductive allocation.

Poorboy Dylan M DM Bowers E Keith EK Sakaluk Scott K SK Thompson Charles F CF

Behavioral ecology : official journal of the International Society for Behavioral Ecology 20180716 5

Parental and territory quality are often correlated in territorial birds, and both factors influence the resources allocated to offspring. Surprisingly, the relative contribution of these two components of variation in parental investment remains obscure. We experimentally decoupled the normal covariation between parental quality and territory quality to test the hypothesis that territory quality influences female prenatal and postnatal reproductive allocation. Territories were categorized into ...[more]

PMID: 30214135

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Project description:Pre-reproductive environmental enrichment of female rats influences sensorimotor development and spatial behavior of the offspring, possibly through the changed maternal nurturing. Nevertheless, maternal care could be not the solely responsible for changing offspring developmental trajectories. To disentangle the specific contribution to the transgenerational inheritance of pre- and post-natal factors, a cross-fostering study was performed. Female rats were reared in an enriched environment from weaning to sexual maturity, while control female rats were reared under standard conditions. Following mating with standard-reared males, all females were housed individually. Immediately after delivery, in- or cross-fostering manipulations were performed so that any foster dams received pups born to another dam of the same (in-fostering) or the opposite (cross-fostering) pre-reproductive rearing condition. In lactating dams maternal care and nesting activities were assessed, while in their male pups spatial abilities were assessed through Morris Water Maze (MWM) test at post-natal day 45. Moreover, the expression of Brain-Derived-Neurotrophic-Factor (BDNF) was evaluated in the hippocampus and frontal cortex of dams and pups at weaning. Pre-reproductive maternal environmental enrichment, followed by adoption procedures, loosened its potential in modifying maternal care and offspring developmental trajectories, as indicated by the lack of differences between in-fostered groups of dams and pups. In addition, enriched dams rearing standard pups showed the least complex maternal repertoire (the highest sniffing duration and the lowest nest quality), and their pups showed a reduced spatial learning in the MWM. Nevertheless, pre-reproductive maternal enrichment kept influencing neurotrophic pattern, with enriched dams expressing increased frontal BDNF levels (regardless of the kind of fostered pups), and their offspring expressing increased hippocampal BDNF levels. The present findings enlighten the crucial importance of the early mother-pups interactions in influencing maternal care and offspring phenotype, with the enriched dam-standard pups couple resulting in the most maladaptive encounter. Our study thus sustains that the bidirectional interactions between mother and pups are able to deeply shape offspring phenotype.

Project description:ObjectiveTo assess the impact of the Gender Roles, Equality and Transformations (GREAT) intervention: a narrative-based, resource-light, life-stage tailored intervention package designed to promote gender-equitable attitudes and behaviours, and improve sexual and reproductive health (SRH) and gender-based violence (GBV) outcomes among adolescents and their communities.DesignRepeated cross-sectional evaluation study, using propensity score matching combined with difference-in-difference estimation.SettingTwo postconflict communities in Lira and Amuru districts in Northern Uganda.ParticipantsMale and female unmarried adolescents (10-14 years, 15-19 years), married adolescents (15-19 years) and adults (over the age of 19 years) were selected using a stratified, two-stage cluster sample of primary and secondary schools and households (baseline: n=2464, endline: n=2449).Primary outcome measuresInequitable gender attitudes and behaviours; GBV; and SRH knowledge and behaviours.ResultsStatistically significant intervention effects were seen across all three outcomes-gender equity, GBV and SRH-among older and newly married adolescents and adults. Among older adolescents, intervention effects include shifts on: inequitable gender attitudes scale score: -4.2 points ((95% CI -7.1 to -1.4), p<0.05); Inequitable household roles scale score: -11.8 ((95% CI -15.6to -7.9), p<0.05); Inequitable attitudes towards GBV scale: -1.9 ((95% CI -5.0 to -0.2), p<0.05); per cent of boys who sexually assaulted a girl in past 3 months: -7.7 ((95% CI -13.1 to -2.3), p<0.05); inequitable SRH attitudes scale: -10.1 ((95% CI -12.9 to -7.3), p<0.05). Among married adolescents, intervention effects include shifts on: Inequitable household roles scale score: -6.5 ((95% CI -10.8 to -2.2), p<0.05); inequitable attitudes towards GBV scale: -4.7 ((95% CI -9.8 to -0.3), p<0.05); per cent who reacted violently to their partner: -15.7 ((95% CI -27.1 to -4.4), p<0.05); inequitable SRH attitudes scale: -12.9 ((95% CI -17.3 to -8.5), p<0.05).ConclusionThe GREAT intervention model demonstrates the promise of a resource-light, life-stage tailored programme that employs culturally appropriate, participatory and narrative-based techniques to advance gender equity and adolescent health. This type of programming contributes towards reductions in GBV and improved adolescent SRH outcomes.

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Experimental cross-fostering of eggs reveals effects of territory quality on reproductive allocation.

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Experimental cross-fostering of eggs reveals effects of territory quality on reproductive allocation.

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