Ảnh hưởng của cá mái chèo nhỏ đến sự phân bố theo chiều dọc của cộng đồng meiofauna

Hydrobiologia - Tập 820 - Trang 215-226 - 2018
Sebastian Weber1,2, Nabil Majdi1,3, Walter Traunspurger1
1Animal Ecology, Bielefeld University, Bielefeld, Germany
2Zoo Schwerin gGmbH, Schwerin, Germany
3Université de Toulouse, EcoLab UMR 5245 CNRS, INPT, UPS, ENSAT, Toulouse, France

Tóm tắt

Mô hình phân bố của meiofauna đáy trong các hệ sinh thái nước ngọt phản ánh sự đánh đổi giữa việc cư trú ở bề mặt trầm tích có nguy cơ cao nhưng năng suất cao so với điều kiện an toàn hơn nhưng sinh lý khắc nghiệt hơn ở sâu trong trầm tích. Trong nghiên cứu này, chúng tôi đã sử dụng các lồng và không lồng tại một ao nước ngọt tự nhiên để điều tra ảnh hưởng của cá chép thanh niên (Cyprinus carpio) lên các mô hình phân bố của các tập hợp meiofauna. Cá chép đã ăn một cách khát ăn meiofauna, giảm mật độ và sinh khối của giun tròn, giun đốt cũng như động vật giáp xác vi mô trong vài ngày, nhưng không ảnh hưởng đến rotifer, ở cả lớp trầm tích nông (0–2 cm) và sâu hơn (2–4 cm). Tuy nhiên, sự ăn thịt của cá đã có ít ảnh hưởng hơn đến quần thể giun tròn và giun đốt trong trầm tích sâu hơn so với trầm tích bề mặt, như được chứng minh bằng sự giảm 65 so với 80%, tương ứng. Phân tích nội dung ruột của cá chép cho thấy mức độ ăn tạp cao, bao gồm việc tiêu thụ thường xuyên các sinh vật meiofauna và cũng chứng tỏ tầm quan trọng của động vật không xương sống meiofaunal như con mồi cho các loài cá ăn đáy thanh niên.

Từ khóa

#meiofauna #cá chép #sinh thái học nước ngọt #phân bố theo chiều dọc #động vật không xương sống

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