Nhện trong hệ sinh thái ruộng lúa chuyển từ con mồi dưới nước sang con mồi trên cạn và sử dụng các nguồn carbon khác nhau

Oecologia - Tập 192 - Trang 801-812 - 2020
Nico Radermacher1, Tamara R. Hartke1, Sylvia Villareal2, Stefan Scheu1,3
1J.F. Blumenbach Institute of Zoology and Anthropology, University of Göttingen, Göttingen, Germany
2Crop and Environmental Sciences Division, International Rice Research Institute (IRRI), Los Baños, Philippines
3Centre of Biodiversity and Sustainable Land Use, University of Göttingen, Göttingen, Germany

Tóm tắt

Nhện là những tác nhân điều khiển sinh học quan trọng đối với các loài sâu hại lúa như côn trùng nhảy và côn trùng lá. Để nghiên cứu sự thay đổi theo thời gian trong con mồi của nhện và sự biến động của con mồi do cấu trúc cảnh quan xung quanh cánh đồng lúa, các đồng vị ổn định carbon và nitơ của các loài động vật không xương sống tại cánh đồng lúa đã được phân tích trong ba lần lấy mẫu liên tiếp trong mùa vụ trồng lúa. Thành phần đồng vị ban đầu của ruồi và muỗi từ các cánh đồng lúa ngập nước cho thấy chế độ ăn từ tảo ở giai đoạn larva, trong khi các giá trị sau đó cho thấy sự chuyển đổi sang carbon từ lúa. Các giá trị δ13C ban đầu của côn trùng nhảy và côn trùng lá cao hơn ở các cánh đồng có cấu trúc cảnh quan đa dạng lúa, chỉ ra sự di cư từ các quần thể nguồn ăn cỏ C4 vào các cánh đồng lúa; sau đó, các giá trị δ13C của chúng tiến gần đến giá trị của lúa. Giá trị đồng vị của nhện xây tổ và nhện chạy trong các mẫu đầu tiên chỉ ra con mồi là ruồi và muỗi dưới nước. Sự chuyển đổi sau này sang con mồi là động vật ăn cỏ trên cạn rõ rệt hơn đối với các loài nhỏ so với các loài lớn và ở các ruộng lúa gần thực vật thường xuyên, cho thấy sự sử dụng con mồi từ cảnh quan xung quanh. Các kết quả cho thấy nhện trong cánh đồng lúa được hỗ trợ bởi ba nguồn carbon khác nhau: (1) carbon dưới nước có nguồn gốc từ tảo và (2) carbon dư từ các chu kỳ phát triển trước, cả hai đều được đưa vào thông qua việc săn mồi giữa các mùa, và (3) carbon từ mùa lúa hiện tại được đưa vào thông qua con mồi động vật ăn cỏ. Kết luận, việc thúc đẩy sự phát triển của ấu trùng muỗi và ruồi dưới nước, chẳng hạn như thông qua việc phủ đất, và tích hợp các cánh đồng lúa vào các cảnh quan lúa đa dạng có thể củng cố kiểm soát sinh học đối với các loài sâu hại trong ruộng lúa bằng cách hỗ trợ quần thể nhện cao giữa các mùa trồng trọt.

Từ khóa

#nhện #cánh đồng lúa #sinh thái học #kiểm soát sinh học #động vật không xương sống

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