Incestuous matings by the purple-crowned fairy wren Malurus coronatus result in severe fitness costs due to inbreeding depression (greater than 30% reduction in hatchability of eggs). Females paired with related males may undertake extra pair matings (see Promiscuity#Other animals for 90% frequency in avian species) that can reduce the negative effects of inbreeding. However, there are ecological and demographic constraints on extra pair matings. Nevertheless, 43% of broods produced by incestuously paired females contained extra pair young.
గుడ్లు పొదిగే సామర్థ్యం 30 శాతం కంటే ఎక్కువ ఉన్నప్పుడు దానిని ఏమి అంటారు?
inbreeding depression