Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Ít biến thiên khi sinh trưởng nhanh hơn? Đánh giá thực nghiệm về mối quan hệ giữa tốc độ sinh trưởng với các đặc điểm chức năng của diatom biển Phaeodactylum tricornutum
Hydrobiologia - Trang 1-15 - 2024
Tóm tắt
Sự đa dạng và các yếu tố thúc đẩy cũng như hệ quả của nó là trọng tâm của nghiên cứu sinh thái học. Chủ yếu, các nghiên cứu đã tập trung vào các loài khác nhau, nhưng nếu những nguyên nhân dẫn đến sự gia tăng hoặc giảm sút đa dạng là chung, thì các mô hình quan sát được cũng nên có thể thấy trong các kiểu gen. Như nghiên cứu trước đây cho thấy có sự biến động lớn hơn trong tỷ lệ nitơ/phospho (N/P) giữa các quần thể tảo đơn bào sinh trưởng chậm, so với các quần thể sinh trưởng nhanh, chúng tôi kỳ vọng sẽ quan sát được các mô hình tương tự trong các chủng giống diatom gen đồng nhất phát triển với tốc độ khác nhau. Chúng tôi đã kiểm tra giả thuyết này trong một thí nghiệm trong phòng thí nghiệm được thực hiện với một quần thể đơn bào của diatom Phaeodactylum tricornutum. Sử dụng gradient tốc độ sinh trưởng thu được từ 10 chemostat, chúng tôi đã có thể xác định ảnh hưởng của tốc độ sinh trưởng đến tỷ lệ hóa học nguyên tố của diatom cũng như đến các đặc điểm được chọn, như kích thước và hình dạng tế bào. Kết quả của chúng tôi thực sự cho thấy sự biến thiên liên tế bào ít hơn (trong các đặc điểm được đánh giá ở mức tế bào đơn lẻ) trong các quần thể phát triển nhanh hơn, điều này đi kèm với xu hướng giảm trong tỷ lệ N/P chung. Chúng tôi cho rằng sự biến thiên cao hơn ở các tốc độ sinh trưởng thấp hơn có thể dẫn đến sự biến thiên cao hơn của nguồn thức ăn có sẵn cho các mức dinh dưỡng cao hơn với những hệ quả tiềm năng cho hiệu quả chuyển giao năng lượng và vật chất trong các chuỗi thức ăn biển.
Từ khóa
#đa dạng sinh học #Phaeodactylum tricornutum #tốc độ sinh trưởng #đặc điểm chức năng #chuỗi thức ăn biểnTài liệu tham khảo
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