Khoảng nhiệt độ và cường độ ánh sáng hạn chế hỗ trợ sự phát triển tối ưu của các giao tử Lessonia corrugata (Ochrophyta): Ý nghĩa cho nuôi trồng tảo bẹ và phản ứng với biến đổi khí hậu

Springer Science and Business Media LLC - Tập 33 - Trang 1721-1730 - 2021
Ellie R. Paine1, Matthias Schmid1, Juan Diego Gaitán-Espitia2, Joshua Castle1, Ian Jameson3, John C. Sanderson4, Catriona L. Hurd1
1Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia
2SWIRE Institute of Marine Sciences & School of Biological Sciences, The University of Hong Kong, Hong Kong, China
3CSIRO Oceans and Atmosphere, Hobart, Australia
4Tassal Group Limited, Hobart, Australia

Tóm tắt

Tảo bẹ Lessonia corrugata (Ochrophyta, Laminariales) đang được phát triển cho các thử nghiệm nuôi trồng đa tầng tích hợp (IMTA) gần các trại nuôi cá hồi ở Tasmania, Úc. Các giao tử của tảo được duy trì bằng phương pháp thực vật trước khi được cấy hạt giống trên dây hatchery; tuy nhiên, điều kiện nhiệt độ và ánh sáng tối ưu cho sự phát triển và phát sinh giới tính vẫn chưa được biết đến. Chúng tôi đã đo kích thước sinh dưỡng của giao tử cái và giao tử đực và sự phát triển giới tính của giao tử cái trong một phạm vi nhiệt độ và cường độ ánh sáng bằng cách sử dụng bàn nhiệt gradient và bộ lọc ánh sáng có mật độ trung tính. Trong một thí nghiệm kéo dài 4 tuần, các giao tử đã được tiếp xúc với sự kết hợp của nhiệt độ (5,7–24,9 °C) và cường độ ánh sáng (10–100 μmol photon m−2 s−1) để đánh giá hiệu suất sinh học. Tại các cực nhiệt độ (nóng nhất = 24,9 °C, lạnh nhất = 5,7 °C), chúng tôi đã quan sát thấy giới hạn nhiệt độ quan trọng cho loài này và các kết quả cho thấy có một khoảng nhiệt độ tối ưu hẹp cho sự phát triển và phát sinh giới tính trong khoảng 15,7 và 17,9 °C, với cường độ ánh sáng từ 40 đến 100 μmol photon m−2 s−1 dẫn đến các giao tử cái sinh sản. Lessonia corrugata sống trong một phạm vi địa lý hạn chế, chỉ được tìm thấy xung quanh Tasmania, phía nam của đất liền Úc, do đó, những thay đổi đại dương như sự gia tăng nhiệt độ bề mặt biển (SSTs) và các chế độ bức xạ ánh sáng thay đổi có thể hạn chế việc tuyển chọn các giai đoạn sống vi mô sớm trong tương lai. Các phát hiện của chúng tôi cung cấp điều kiện văn hóa tối ưu cho nuôi trồng thủy sản và thông tin để dự đoán khoảng địa lý tương lai của L. corrugata dưới tác động của biến đổi khí hậu toàn cầu.

Từ khóa

#Lessonia corrugata #tảo bẹ #nuôi trồng thủy sản #nhiệt độ #cường độ ánh sáng #biến đổi khí hậu

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