Thermal adaptation best explains Bergmann’s and Allen’s Rules across ecologically diverse shorebirds

Alexandra McQueen, Marcel Klaassen, Glenn J. Tattersall, Robyn Atkinson, Roz Jessop, Chris J. Hassell, Maureen Christie and Matthew R. E. Symonds ()
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Alexandra McQueen: Deakin University
Marcel Klaassen: Deakin University
Glenn J. Tattersall: Brock University
Robyn Atkinson: BirdLife Australia
Roz Jessop: BirdLife Australia
Chris J. Hassell: Global Flyway Network
Maureen Christie: Friends of Shorebirds SE
Matthew R. E. Symonds: Deakin University

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Bergmann’s and Allen’s rules state that endotherms should be larger and have shorter appendages in cooler climates. However, the drivers of these rules are not clear. Both rules could be explained by adaptation for improved thermoregulation, including plastic responses to temperature in early life. Non-thermal explanations are also plausible as climate impacts other factors that influence size and shape, including starvation risk, predation risk, and foraging ecology. We assess the potential drivers of Bergmann’s and Allen’s rules in 30 shorebird species using extensive field data (>200,000 observations). We show birds in hot, tropical northern Australia have longer bills and smaller bodies than conspecifics in temperate, southern Australia, conforming with both ecogeographical rules. This pattern is consistent across ecologically diverse species, including migratory birds that spend early life in the Arctic. Our findings best support the hypothesis that thermoregulatory adaptation to warm climates drives latitudinal patterns in shorebird size and shape.

Date: 2022
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DOI: 10.1038/s41467-022-32108-3

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