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Reproductive biology of american robins in northern maine usa






Auk 94(1): 80-85

Reproductive biology of american robins in northern maine usa

The nesting biology of the American robin [Turdus migratorius] was studied in N Maine [USA] forests during the summer of 1971. Robins arrived on the study tracts in early April and 78% of them nested within 5 m of a clearing. Robins nested higher in deciduous trees than in coniferous trees but this was probably a function of tree height. Of the nests in coniferous trees 65% were in an axillary position and 61% of the nests in deciduous trees were saddled on limbs. Egg-laying began on May 10 and ended on July 6 with the peak of laying occurring between 21-25 May. Mean clutch size of 38 nests was 3.2. Of the 34 nests built in coniferous trees 18% were successful, while 52% (N = 20) of the nests were successful in deciduous trees. Daily mortality rates of eggs and young in nests in conifers were 6.7% and 4.2%, respectively. Daily mortality rates of eggs and young in nests in deciduous trees were 2.9% and 1.3%. Unknown predators were responsible for all nesting failures. The average number of young fledging per successful nest was 2.5, which put production near the lower limit that has been reported for population stability in robins.


Accession: 006316384

DOI: 10.2307/4084892



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