Tốc độ tăng trưởng của Daphnia ăn seston trong một hồ chứa ở Siberia: vai trò của axit béo thiết yếu

Michail I. Gladyshev1,2, Nadezhda N. Sushchik1,2, Olga P. Dubovskaya1, Olesia N. Makhutova1, Galina S. Kalachova1
1Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russia
2Siberian Federal University, Krasnoyarsk, Russia

Tóm tắt

Tốc độ tăng trưởng cụ thể (dựa trên sự gia tăng sinh khối theo đơn vị thời gian) của Daphnia được cho ăn seston tự nhiên từ một hồ chứa eutrophic ở Siberia đã được nghiên cứu trong bốn mùa sinh trưởng trong một hệ thống chảy qua trong phòng thí nghiệm. Nồng độ carbon, nitơ và photpho dạng hạt trong seston hồ <115 μm khá cao, lần lượt là 1.9, 0.2 và 0.05 mg l−1; tỉ lệ C:P tối đa là 259 mol:mol. Theo các ngưỡng truyền thống, nồng độ các nguyên tố và tỉ lệ giữa chúng không giới hạn tốc độ tăng trưởng của Daphnia. Axit eicosapentaenoic (EPA) trong seston đã ảnh hưởng đáng kể đến tốc độ tăng trưởng với nồng độ lên tới khoảng 13 μg l−1 (giá trị kiểm định F của ANOVAR là 7.91), nhưng không ở nồng độ cao hơn. Do đó, chúng tôi xem xét nồng độ EPA này trong seston <115 μm là nồng độ giới hạn của EPA cho sự tăng trưởng của Daphnia (nhóm longispina), tức là, dưới nồng độ này, EPA là dự đoán đơn lẻ tốt nhất về sự tăng trưởng của Daphnia.

Từ khóa

#Daphnia #seston #axit eicosapentaenoic #hồ chứa #sinh học nước

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