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Mối Quan Hệ Tại Địa Phương và Cảnh Quan Giữa Vịt Lặn Mùa Đông và Các Khu Đầm Lầy Ở Mississippi
Tóm tắt
Các đặc điểm cảnh quan ảnh hưởng đến sự phân bố của các loài chim nước trong suốt chu kỳ hàng năm của chúng. Một mô hình khái niệm, phức hợp môi trường sống vùng đất ngập nước, có thể hữu ích trong việc bảo tồn các môi trường sống vùng đất ngập nước cho các loại vịt lặn (Anatini). Cơ sở của mô hình khái niệm này là vịt tìm kiếm các phức hợp vùng đất ngập nước chứa nguồn tài nguyên đa dạng để đáp ứng nhu cầu sinh lý thay đổi. Chúng tôi đã bao gồm đất trồng cây ngập nước, các khu đất ngập nước và ao, khu bảo tồn chim nước công cộng và sự đa dạng của các môi trường sống như các thành phần chính của phức hợp môi trường sống vùng đất ngập nước và so sánh ảnh hưởng tương đối của chúng ở hai quy mô không gian (tức là, quy mô địa phương, bán kính 0.25 km; cảnh quan, 4 km) đối với các loài vịt lặn mùa đông ở tây Mississippi, Hoa Kỳ trong các mùa đông từ 2002 đến 2004. Sự phân bố của nhóm vịt mallard (Anas platyrhynchos) có sự liên kết tích cực với đất nông nghiệp ngập nước ở cả quy mô địa phương và cảnh quan. Các mô hình đại diện cho đất nông nghiệp ngập nước ở quy mô cảnh quan giải thích tốt nhất sự xuất hiện của các loài vịt lặn khác. Độ phức tạp của môi trường sống đo được ở cả hai quy mô giải thích tốt nhất kích thước nhóm của các loài vịt lặn khác. Đất trồng cây ngập nước có thể đã cung cấp thực phẩm mà trước đó đã giảm tính khả dụng do việc chuyển đổi vùng đất ngập nước thành nông nghiệp. Các phức hợp vùng đất ngập nước ở quy mô cảnh quan thu hút hơn đối với các loài vịt mùa đông so với các khu đất ngập nước đơn lẻ hoặc có cấu trúc đơn giản. Việc bảo tồn các phức hợp vùng đất ngập nước ở quy mô không gian lớn (≥5,000 ha) trên đất công và tư sẽ yêu cầu sự phối hợp giữa nhiều bên liên quan.
Từ khóa
#vịt lặn #đất ngập nước #bảo tồn #động vật hoang dã #MississippiTài liệu tham khảo
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