The ROC Ornithological Society has been studying Taiwan's annual migrant bird population for the past ten years or so, and has found steady negative growth along the west coast from the Kuantu estuary at Tamsui southward via the Chu-an and Tatu estuaries to the Tsengwen estuary at Tainan, due to aquaculture and industrial development, along with oil and garbage pollution.
十幾年來，野鳥學會每年對台灣候鳥鳥口做調查，西岸由淡水關渡河口、竹安溪口、大肚溪口到台南曾文溪河口，因為魚塭、工業區不斷開發，加上油污、垃圾等污染，鳥口一直是負成長。