Biến động cấu trúc thành phần loài giáp xác râu ngành (Cladocera) dưới sự thay đổi của độ mặn vùng cửa sông Hậu
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Abstract
This study aimed to assess the effects of salinity variation on the species composition of Cladocera in the Hau river estuary area. Salinities and Cladocera samples were collected monthly from 07/2017 to 06/2018 during high tide and low tide at Cai Con, Dai Ngai and Tran De. These results showed that salinity on Hau River ranged from 0 to20‰, and salinity intrusion occurred strongly from 12/2017 to 04/2018. There were 12 species of Cladocera on Hau River, and its total density was 4,571-21,898 ind.m-3. Besides, regression results showed that the amount of appeared species and its density were negatively correlated with salinity. Moreover, in the range 0-2‰ of salinity, Cladocera thrived on Hau river. Saline intrusion had reduced the composition and density of the Cladocera in the Hau River estuarine.
Tóm tắt
Nghiên cứu được thực hiện nhằm đánh giá sự biến động thành phần loài giáp xác râu ngành (Cladocera) dưới sự thay đổi của độ mặn ở vùng cửa sông Hậu. Độ mặn và Cladocera được thu hàng tháng trong thời gian từ tháng 7/2017 đến tháng 6/2018 vào lúc đỉnh triều và chân triều tại Cái Côn, Đại Ngãi và Trần Đề. Kết quả cho thấy, độ mặn trên sông Hậu từ 0 đến 20‰, xâm nhập mặn xảy ra từ tháng 12/2017 đến tháng 4/2018. Có 12 loài Cladocera được ghi nhận với tổng mật độ từ 4.571 đến 21.898 ct/m3. Kết quả hồi quy cho thấy, số lượng loài và mật độ Cladocera đều tương quan nghịch với độ mặn. Độ mặn từ 0 đến 2‰ là khoảng thích hợp cho Cladocera trên sông Hậu phát triển. Xâm nhập mặn đã làm giảm thành phần và mật độ Cladocera tại vùng hạ lưu sông Hậu.
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