Article Abstract:
An experiment using zebra finches, Taeniopygia guttata, wasconducted to test the assumption that foragers with high net energy gain levelspossess higher fitness than foragers with low net levels of energy gain. The zebra finches were subjected to altering rate of energy gain without changing the quantity of food on hand or the food consumed. Reproductive success was also observed for the lifetime of the birds. The findings showed that reproductive success declined as the net rate of energy gain decreased. Such results supported the popular use of energy measurement to predict fitness.
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Article Abstract:
Alteration in sexual attractiveness is a potentially significant mechanism through which brood size affects the fitness of zebra finch, Taeniopygia guttata, offspring. Male and female zebra offsprings are larger and heavier as adults and develop the adult bill color sooner when reared in small broods. Males brought up in small broods develop redder beaks as adults and attract individuals of the opposite sex. Strong positive correlation is seen between weight and tarsus length among males while no correlation is observed between attractiveness and offspring traits among females.
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Article Abstract:
Zebra finch songs were studied with regard to interobserver reliability of scoring sonagrams by eye.
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