Long-Term Continental Changes in Wing Length, but Not Bill Length, of a Long-Distance Migratory Shorebird

Resource type
Date created
2017-02-20
Abstract
We compiled a >50‐year record of morphometrics for semipalmated sandpipers (Calidris pusilla), a shorebird species with a Nearctic breeding distribution and intercontinental migration to South America. Our data included >57,000 individuals captured 1972–2015 at five breeding locations and three major stopover sites, plus 139 museum specimens collected in earlier decades. Wing length increased by ca. 1.5 mm (>1%) prior to 1980, followed by a decrease of 3.85 mm (nearly 4%) over the subsequent 35 years. This can account for previously reported changes in metrics at a migratory stopover site from 1985 to 2006. Wing length decreased at a rate of 1,098 darwins, or 0.176 haldanes, within the ranges of other field studies of phenotypic change. Bill length, in contrast, showed no consistent change over the full period of our study. Decreased body size as a universal response of animal populations to climate warming, and several other potential mechanisms, are unable to account for the increasing and decreasing wing length pattern observed. We propose that the post‐WWII near‐extirpation of falcon populations and their post‐1973 recovery driven by the widespread use and subsequent limitation on DDT in North America selected initially for greater flight efficiency and latterly for greater agility. This predation danger hypothesis accounts for many features of the morphometric data and deserves further investigation in this and other species.
Document
Identifier
DOI: 10.1002/ece3.2898
Published as
Lank, D. B., Xu, C., Harrington, B. A., Morrison, R. I. G., Gratto-Trevor, C. L., Hicklin, P. W., Sandercock, B. K., Smith, P. A., Kwon, E., Rausch, J., Pirie Dominix, L. D., Hamilton, D. J., Paquet, J., Bliss, S. E., Neima, S. G., Friis, C., Flemming, S. A., Anderson, A. M., & Ydenberg, R. C. (2017). Long-term continental changes in wing length, but not bill length, of a long-distance migratory shorebird. Ecology and Evolution, 7(9), 3243–3256. https://doi.org/10.1002/ece3.2898
Publication title
Ecology and Evolution
Document title
Long-Term Continental Changes in Wing Length, but Not Bill Length, of a Long-Distance Migratory Shorebird
Date
2017
Volume
7
Issue
9
First page
3243
Last page
3256
Publisher DOI
10.1002/ece3.2898
Copyright statement
Copyright is held by the author(s).
Peer reviewed?
Yes
Language
Member of collection
Attachment Size
ece3.2898.pdf 646.62 KB