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Snail Kites’ Affinity for Home Leaves It in More Peril

Date:
December 10, 2015
Source:
University of Florida Institute of Food and Agricultural Sciences
Summary:
The endangered snail kite's affinity for its birthplace can come back to haunt the bird, leaving it in more peril, according to a new study.
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The federally endangered snail kite moves to nesting habitats that resemble its home, but those new homes get preyed upon, leaving the bird in further danger of survival, according to a new study led by Robert Fletcher, a UF/IFAS associate professor of wildlife ecology and conservation.
Credit: Courtesy: Robert Fletcher, UF/IFAS

The endangered snail kite's affinity for its birthplace can come back to haunt the bird, leaving it in more peril, according to a new University of Florida Institute of Food and Agricultural Sciences study.

Snail kites are important for at least two reasons: Bird enthusiasts flock to see them in their natural habitat, so they're a bit of a tourist magnet. Secondly, wildlife managers use the snail kite as a barometer for conservation actions to preserve the Everglades, said Robert Fletcher, a UF/IFAS associate professor of wildlife ecology and conservation.

The population of snail kites declined from about 3,500 to about 700 from 1999 through 2008. The bird has bounced back a bit, to about 1,700 birds in 2014, mostly in the lake habitats to the north of the Everglades.

Because of the snail kite's dwindling population, Fletcher led a 17-year study into dispersal patterns of the federally endangered bird. The study, published in the journal Proceedings of the Royal Society B, spans the years 1997 to 2013.

Researchers counted birds and determined where individual snail kites nested over time to see if they returned to their abodes. The scientists' work shows that despite the fact that snail kites move around considerably, they have strong preferences for places like home, and this impacts breeding, Fletcher said.

Other species often prey on the snail kite's nests; thus, leaving the bird unable to reproduce as effectively, he said. Snail kites that leave their nesting areas in the Everglades usually find new homes that resemble their old ones, Fletcher said. Yet snail kites that disperse to places like their home are more likely to have their nests preyed on.

"This is important and surprising and is some of the first evidence of this migratory pattern in vertebrates," he said.

Scientists have long been interested in studying how your birthplace influences people and animals later in life. Fletcher describes the snail kite's affinity for its birthplace as something akin to a line from "The Wizard of Oz." As Dorothy says near the end of the movie, "There's no place like home."

"For people, we have strong evidence of this," Fletcher said. "For example, I was born near the Smokey Mountains, and when I left home, I longed for a move to other areas where there were mountains. For animals, it has been suggested to occur, but there has been limited evidence in wild populations. Our work provides strong evidence for these effects and shows why they are important."


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Materials provided by University of Florida Institute of Food and Agricultural Sciences. Note: Content may be edited for style and length.


Journal Reference:

  1. Robert J. Fletcher, Ellen P. Robertson, Rebecca C. Wilcox, Brian E. Reichert, James D. Austin, Wiley M. Kitchens. Affinity for natal environments by dispersers impacts reproduction and explains geographical structure of a highly mobile bird. Proceedings of the Royal Society B: Biological Sciences, 2015; 282 (1814): 20151545 DOI: 10.1098/rspb.2015.1545

Cite This Page:

University of Florida Institute of Food and Agricultural Sciences. "Snail Kites’ Affinity for Home Leaves It in More Peril." ScienceDaily. ScienceDaily, 10 December 2015. <www.sciencedaily.com/releases/2015/12/151210093602.htm>.
University of Florida Institute of Food and Agricultural Sciences. (2015, December 10). Snail Kites’ Affinity for Home Leaves It in More Peril. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2015/12/151210093602.htm
University of Florida Institute of Food and Agricultural Sciences. "Snail Kites’ Affinity for Home Leaves It in More Peril." ScienceDaily. www.sciencedaily.com/releases/2015/12/151210093602.htm (accessed May 26, 2017).

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