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Courtship display by great frigatebirds, Fregata minor: an energetically costly handicap signal?

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Abstract

We used detailed time-budget observations, mark-resight data, and doubly labeled water estimates of energy expenditure to test whether energy spent on courtship display by male frigatebirds functions as a sexually selected handicap signal. During a 2-day period of time budget observations, males displayed on average 29.5% of the time (range 0–100% for 15 different males), and this value was correlated with an index of season-long display effort. Season-long display effort was strongly predictive of pairing success. Average field metabolic rate (FMR) during the 2-day time budget period was 676.5 kJ/day (range 464.8–1035.0), substantially lower than the mass-specific FMR predicted from studies of other seabirds during incubation or chick-rearing. Despite a low overall FMR, display effort could function as an energetic handicap, either if FMR correlates positively with the amount of courtship performed or if high-quality males display at a high rate because they pay a lower energy cost per unit of display than do low-quality males. We found no relationship between FMR and display rate, despite good power for doing so. We also did not find a significant difference in energy spent divided by courtship time for males that were or were not chosen by females (inferred to be high- and low-quality males, respectively), though the medians differed in the predicted direction (preferred males having lower relative costs than non-preferred males) and the confidence interval on the difference between groups was very wide. Thus, we found evidence that male courtship effort is predictive of pairing success, we rejected one mechanism by which energetic cost of display could function as a handicap, and our test of the alternate energetic handicap mechanism was equivocal.

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Acknowledgements

We thank Pete Hurd for discussions about signaling theory. Funding for DLW analysis was provided by an American Philosophical Society grant to D.C.D., with additional funding provided by Ohio State University, Bucknell University, and NSF IBN-0212092 to J.B.W.. Beth Flint and Brian Allen of the U.S. Fish and Wildlife Service kindly provided logistical support and access to Tern Island, and Frans Juola and Laura Carsten helped capture frigatebirds. This research complied with applicable laws and permits of the United States.

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Correspondence to Donald C. Dearborn.

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Communicated by M. Leonard

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Dearborn, D.C., Anders, A.D. & Williams, J.B. Courtship display by great frigatebirds, Fregata minor: an energetically costly handicap signal?. Behav Ecol Sociobiol 58, 397–406 (2005). https://doi.org/10.1007/s00265-005-0933-7

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