Sexual reproduction can be thought of as a cooperative process in which two individuals come together to produce a new individual. It can also be viewed as a process in which two parties with differing interests, investment, and background interact to produce a new individual. From the former perspective, parental interests are unified (both wish to produce vigorous offspring), while the latter suggests possible conflict. This conflict can occur before or after fertilization. Before fertilization, the mother has an interest in picking the best suited father from a larger pool, while all fathers have an interest in being picked. After fertilization, fathers have an interest in maximizing maternal investment in their progeny, while mothers will have an interest in carefully partitioning resources among progeny to maximize their combined success.
A new study in the September issue of The American Naturalist argues that with increased self-fertilization, parental conflict decreases. Consequently, parents from frequently selfing groups should be competitively inferior with respect to this parental conflict. Yaniv Brandvain and David Haig examine crosses between selfing and outcrossing pairs and find that, in most cases, there are pre- and post-zygotic symptoms of outcrossers being "stronger" than selfers with regard to parental conflict. They contend that this competitive imbalance can explain a common pattern of unilateral incompatibility, in which pollen from self-incompatible populations can successfully fertilize ovules of self-compatible individuals, but the reciprocal cross fails. Since both pre- and post-zygotic consequences of this imbalanced conflict can perturb successful fertilization and development, they provide barriers to hybridization and may facilitate speciation.
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University of Chicago Press Journals
. Divergent life history shapes gene expression in brains of salmon2
. Common fungicide causes long-term changes in mating behavior3
. Microfluidic chip helps solve cellular mating puzzle4
. Male chimpanzees prefer mating with old females5
. New research reveals unexpected post-mating gene expression in model lab insect6
. New study examines how sense of smell affects mating and aggression in mice7
. Study in Royal Society journal on link between creativity and mating success8
. Sperm trading can resolve hermaphrodite mating conflicts9
. Same-sex mating by fungi spawned infection outbreak, evidence suggests10
. Weapon performance determines mating success in the collared lizard11
. New study explores the evolution of male parental care and female multiple mating