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Can Nest Predation Explain the Timing of the Breeding Season and the Pattern of Nest Dispersion of New Holland Honeyeaters?
Ist Teil von
Oikos, 1994-04, Vol.69 (3), p.364-372
Ort / Verlag
Oxford: Munksgaard International Publishers, Ltd
Erscheinungsjahr
1994
Link zum Volltext
Beschreibungen/Notizen
We tested the following two predictions of the hypotheses that predation rate may select for nest spacing and winter breeding in New Holland honeyeaters: (a) the level of nest predation should be lower during the breeding season than outside it, and (b) clumped nests should show a higher predation rate than more dispersed nests. Artificial nests, containing budgerigar and artificial eggs, were set out in four different seasons and in two different configurations: clumped and spaced. Clumped nests suffered higher predation than spaced nests but there was no seasonal difference in total predation rates. Birds accounted for 67% of predation events for which the predator was identified. Among nests that were preyed on by birds, there was a highly significant effect of spacing, indicating that birds were responsible for the higher predation on clumped nests. Hence, these results support one prediction of the predator-avoidance hypothesis for territoriality, but do not support the notion that winter breeding may have evolved as a strategy to avoid predation by snakes.