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New paper out: "Sex and Age-Specific Variation In Provisioning By A Long Distance Neotropical Migrant, the Wood Thrush (Hylocichla mustelina)".
Wood thrushes adjust parental effort based on the age and experience of their breeding partner. Birds that partnered with a different aged bird than themselves performed poorer (provisioned offspring at a lower rate) than those who were partnered with individuals of the same age.
This suggests that partners can not or do not always adjust their parental effort based on the investment of their mate. Overall, the results suggest that age-assortative mating may be an important yet previously unrecognized element of wood thrush reproductive success.