Ảnh hưởng của động vật đến đặc điểm phát tán hạt giống ở New Zealand

Evolutionary Ecology - Tập 25 - Trang 1397-1426 - 2011
Michael J. Thorsen1,2, Philip J. Seddon3, Katharine J. M. Dickinson1
1Department of Botany, University of Otago, Dunedin, New Zealand
2Saint Helena National Trust, Saint Helena Island, South Atlantic Ocean
3Department of Zoology, University of Otago, Dunedin, New Zealand

Tóm tắt

Một loạt các đặc điểm phát tán độc đáo đã được nhận diện trong hệ thực vật New Zealand, và nhiều loài động vật khác nhau tham gia vào quá trình phát tán hạt giống ở New Zealand, thông qua việc tiêu thụ quả hoặc hạt, hoặc đóng vai trò như những người vận chuyển hạt dính. Trong nghiên cứu này, thành phần của faunal zoochorous ở New Zealand (ngoài côn trùng) đã được kiểm tra bằng cách kết hợp các yếu tố đặc trưng trong các biến môi trường, hình thái và hành vi, và so sánh với mẫu hình các đặc trưng của nhóm loài thực vật mà chúng phát tán. Tầm quan trọng của các nhóm phát tán khác nhau đối với các loài thực vật mà chúng phát tán thay đổi theo môi trường sống, hình dạng địa hình, khu vực của New Zealand, hành vi kiếm ăn và hình thái. Hơn một nửa số động vật có xương sống ở New Zealand tham gia vào việc phát tán trái cây, mặc dù chỉ có 6% được coi là ăn trái—phần còn lại bao gồm nhiều loại côn trùng và vật chất thực vật khác trong chế độ ăn của chúng. Các loài có khả năng bay chiếm ưu thế trong môi trường rừng và các tầng cao hơn, trong khi các loài không bay chiếm ưu thế ở môi trường núi cao thấp và đồng cỏ. Nhóm tương tác giữa thực vật có quả và động vật ăn quả cho thấy một số dấu hiệu của tính tổng quát sinh thái khi các loài ăn quả tiêu thụ nhiều kích thước trái cây khác nhau qua các tầng thực vật và các cây có quả có tính đa dạng loài thấp hơn và chiếm một loạt các môi trường sống. Các loài ăn hạt có mặt nhiều hơn ở môi trường đất ngập nước và phía Đông của Đảo Nam. Tầm quan trọng của các loài vô tình phát tán hạt dính phụ thuộc vào việc chúng có khả năng bay hay không (quan trọng hơn trong các môi trường ven biển) hoặc không bay (quan trọng hơn trong các đồng cỏ khô và khu vực núi cao thấp). Một nhóm phụ của các loài chim, chẳng hạn như những loài Apteryx spp. và loài moa đã tuyệt chủng Dinornithiform, với bộ lông lỏng lẻo (các loài “velcro”) chiếm ưu thế trong các tầng thực vật thấp hơn và điều này tương ứng với khu vực nơi mà nhiều loài thực vật phát tán bằng cách bám dính trình bày hạt giống của chúng.

Từ khóa

#phát tán hạt giống #New Zealand #thực vật #động vật #tương tác sinh thái

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