The harbour is a protected wildlife refuge and is home to large populations of swans, waders and other bird life.
This has been studied for life-history traits in cattle (Albuquerque and Meyer 2005), in fruit flies (Snoke and Promislow 2003), and in natural populations of swans (Charmantier et al. 2006).
We first quantified wariness in populations of swans at one urban and one non-urban wetland by estimating flight initiation distance [FID: the distance at which an escape response is initiated from an approaching pedestrian, a potentially-threatening stimulus, 17].
On the frozen Lake Kussharo, on Hokkaido, Japan, a population of whooper swans ( Cygnus cygnus) gathers around the lake in winter, migrating there to take advantage of areas of open water kept ice-free by hot springs.
Milan Bull, the senior director of science and conservation at the society, said the state's population of mute swans in vulnerable shoreline habitats was at dangerously high levels and must be dealt with, lest the birds continue to eat away at the ecosystems and push indigenous species out.
An estimated 70% of the entire eastern population of Tundra Swans winter in northeastern North Carolina (Serie et al. 2002).
"Black swans," however, remain rare in the universe of swans.
On one island in the area, there used to be a population of 300 swan goose – now there are fewer than 60, An said.
The study population for Swan et al. (2005), described below, included 134 women whose male offspring had a physical examination by 17 December 2004, of whom 85 had also given a urine sample during pregnancy.
Low population differentiation at neutrally-selected microsatellite loci and the likely occasional migration of swans between the populations reduces the likelihood of local site adaptations.
