The nest defense behavior of a tundra population of savannah sparrows (Passerculus sandwichensis) was examined to determine the relative importance of past investment and future prospects in determining the observed patterns.
A comparison of birds initiating nests at various times of the breeding season indicated that the change in renesting potential within a breeding season had little influence on the birds' behavior.
For a monomorphic, monogamous passerine the prospective reproductive success for males and females is expected to be quite similar. However, the respective patterns of nest defense behavior differed considerably (Figs. 1 and 2) and most closely reflected past investment. These results are discussed in light of parental investment theory.
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Weatherhead, P.J. Do savannah sparrows commit the concorde fallacy?. Behav Ecol Sociobiol 5, 373–381 (1979). https://doi.org/10.1007/BF00292525
- Reproductive Success
- Breeding Season
- Future Prospect
- Parental Investment
- Defense Behavior