Ecology and population genetics of mottled ducks in the South Atlantic Coastal Zone.

in International Symposium (poster summary), 國際研討會(摘要海報發表)
標題Ecology and population genetics of mottled ducks in the South Atlantic Coastal Zone.
AuthorsGuo-Jing Weng, 翁國精
出版日期Sep 18 2004 12:0
會議地點Calgary, Alberta, Canada

Mottled ducks (Anas fulvigula) were introduced to the Santee River Delta and the ACE (Ashepoo, Combahee, and Edisto Rivers) Basin, South Carolina from Texas, Louisiana, and Florida during 1975-1982 for hunting opportunities. Several populations have been established along the South Carolina and Georgia (SC/GA) coasts from released birds. Expansion of mottled ducks from South Carolina and Georgia is a great concern to ornithologists because of efforts to maintain the Florida mottled duck (A. f. fulvigula) as a distinct population. Our objectives are to study the life history, behavior, habitat selection, and population structure of SC/GA mottled duck population and to detect gene flow between Florida and SC/GA mottled duck populations. Study sites include Bear Island Wildlife Management Area (WMA) and Savannah Corps of Engineers Confined Disposal Facilities in South Carolina, and Savannah National Wildlife Refuge and Altamaha WMA in Georgia. Mottled ducks seldom used water deeper than 12 cm. Submerged plants and aquatic invertebrate abundance did not appear to be associated with habitat use of mottled ducks. All broods over 2 weeks of age survived to fledge. Ducks from hunters’ harvest were collected for genetic analysis. Microsatellite DNA will be used to understand level of gene flow within SC/GA populations and between Florida and SC/GA populations. The results of the genetic analysis will aid management policy and hunting regulations should the SC/GA population eventually colonize near the range of the Florida Mottled Duck populations.

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