Abstract
Abstract Most studies describing reproductive biology of an avian species provide some measure of annual reproductive success (ARS), frequently reported per nest or per egg. These measurements do not indicate the success of average females in the population. We report conventional measures of reproductive success along with ARS(b), number of broods successfully reared per female, and ARS(k), number of young successfully reared per female. We calculated ARS for four culvert-dwelling Cliff Swallow (Petrochelidon pyrrhonota) colonies in east-central Texas from 1982 to 1985 (n = 1805 nests) and compared our calculations of ARS with those reported for other regions. We analyzed differences in number of fledglings per female to estimate variation in ARS among years and among culverts. In east-central Texas, ARS differed significantly among years and among culverts. We attributed variation in ARS to predation and abiotic factors. Consistent reporting of ARS would facilitate comparisons among populations or speci...
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