Change Effect of Eurasian Teal (Anas crecca) distribution from habitat Improvement plan in the Huajiang Wetland
Date Issued
2015
Date
2015
Author(s)
Tseng, Wei-Chieh
Abstract
Huajiang Wetland is located on the merging point of Xingdian River and Da-Han River which between Hua-Jiang Bridge to Jhong-Hsing Bridge. Owing to its rich and diverse nutrients and its slow river flow, the area is endowed with a plethora of benthic invertebrates which attracts a large diversity of winter migrants, among which Eurasian Teal (Anas crecca) occupying the majority. In recent years, the accumulation of sediments from upper stream has caused an increase in terrestrialization on the cost of mud flat areas with a sharp decrease on the number of wintering Eurasian Teal. It is now apparent that the management of these wetlands is of utmost importance. Therefore, the Taipei City Government continued annually habitat improvement plan in Huajiang area since 2006. Present study utilizes monthly bird monitoring by mapping method from Sept, 2012 to March 2013 and Sept 2013 to March 2014. In addition to remote sensing data, actual survey data was utilized to obtain environmental data. Data analysis was conducted to variables including area of mud flat, area of vegetation cover, area of water, length of mud-water interface, visual field of ducks, and distance of Eurasian Teal from human disturbances. We look forward to better understand the efficiency of habitat improvement plan, environmental variables preferred by Eurasian Teal, and relation between duck behavior and environmental variables. The result shows that ducks preferred post recovery area, after the habitat improvement plan was carried out. Eurasian Teal prefer to roost at sites with vast mud flat area, narrow vegetation area, long shore lines, and broad vision. Comparing with feeding time, Eurasian Teal prefer sites away from human disturbance in resting time. Food resource is very important for wintering waterfowl choosing habitat. Dabbling ducks such as Eurasian Teal usually feeding at mud-water interface. To avoid predators and communicate with other ducks, Eurasian Teal will choose a habitat which has better visual field. Eurasian Teal will stay away from human disturbance. Except vast mud flat area constructed by current habitat improvement plan, we suggest that extending shore lines and constructing narrow marsh area should be take into consideration in the future. So that Eurasian Teal can feed and avoid predators at the same time, also separate resting site from human disturbance.
Subjects
Huajiang Wetland
Eurasian Teal
habitat improvement
Area of habitat
visual field
human disturbance
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-104-R99b44026-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):1fe64323faa9884dfafa81abbef9f9dd