Costs of Reproduction and Success of Manipulated Broods Under Varying Food Conditions in Tengmalms Owl

  • Korpimäki E
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(1) Male Tengmalm's owls collect nearly all the food for their females and young in the breeding season. Brood sizes of males between one year and the following year were not significantly correlated. Males rearing large broods survived only marginally better the next year than those rearing small broods. Raising large broods did not reduce the number of primaries moulted by males. (2) In nine cases in 1985 and eleven cases in 1986, one newly hatched young was transferred between two nests. In control nests (twelve in 1985 and fourteen in 1986), one young was exchanged for one young from another brood. (3) The proportion of males surviving and breeding in the next year was similar in the three groups that reared reduced, control or enlarged broods in the preceding year. Enlarged broods did not affect breeding performance in the next year. (4) In 1985 (when the vole supply was increasing), the owls were able to rear enlarged broods, whereas in 1986 (when the vole supply was decreasing), they tended to be unable to do so. In 1986 but not in 1985, fledglings in enlarged broods were slightly lighter than those in control or reduced broods; neither result was significant (P

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  • Erkki Korpimäki

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