Đăng nhập
Tìm kiếm nâng cao
Tên bài báo
Tác giả
Năm xuất bản
Tóm tắt
Lĩnh vực
Phân loại
Số tạp chí

Bản tin định kỳ
Báo cáo thường niên
Tạp chí khoa học ĐHCT
Tạp chí tiếng anh ĐHCT
Tạp chí trong nước
Tạp chí quốc tế
Kỷ yếu HN trong nước
Kỷ yếu HN quốc tế
Book chapter
Tạp chí quốc tế 2016
Số tạp chí 219(2016) Trang: 109-118
Tạp chí: Journal of Experimental Biology

Recent studies suggest that projected rises of aquatic CO2 levels cause acid–base regulatory responses in fishes that lead to altered GABAergic neurotransmission and disrupted behaviour, threatening fitness and population survival. It is thought that changes in Cl− and HCO3− gradients across neural membranes interfere with the function of GABA-gated anion channels (GABAA receptors). So far, such alterations have been revealed experimentally by exposing species living in low-CO2 environments, like many oceanic habitats, to high levels of CO2 (hypercapnia). To examine the generality of this phenomenon, we set out to study the opposite situation, hypothesizing that fishes living in typically hypercapnic environments also display behavioural alterations if exposed to low CO2 levels. This would indicate that ion regulation in the fish brain is fine-tuned to the prevailing CO2 conditions.We quantified pH regulatory variables and behavioural responses of Pangasianodon hypophthalmus, a fish native to the hypercapnic Mekong River, acclimated to high-CO2 (3.1 kPa) or low-CO2 (0.04 kPa) water.We found that brain and blood pH was actively regulated and that the low-CO2 fish displayed significantly higher activity levels, which were reduced after treatment with gabazine, a GABAA receptor blocker. This indicates an involvement of the GABAA receptor and altered Cl− and HCO3 − ion gradients. Indeed, Goldman calculations suggest that low levels of environmental CO2 may cause significant changes in neural ion gradients in P. hypophthalmus. Taken together, the results suggest that brain ion regulation in fishes is fine-tuned to the prevailing ambient CO2 conditions and is prone to disruption if these conditions change.

Các bài báo khác
Số tạp chí 2(2016) Trang: 50-63
Tạp chí: International E-Journal for Research in ELT
Số tạp chí 6(2016) Trang: 222-241
Tạp chí: World Journal of Pharmacy and Pharmaceutical Sciences
Số tạp chí xxx(2016) Trang:
Tác giả: Nguyễn Duy Sang
Tạp chí: Journal of Taibah University for Science
Số tạp chí 38(5)(2016) Trang: 549-557
Tạp chí: Songklanakarin J. Sci. Technol.
Số tạp chí 5(4)(2016) Trang: 616-622
Số tạp chí 65(2016) Trang: 1929-1948
Tạp chí: Optimization
Số tạp chí 61(2016) Trang: 651-668

Vietnamese | English

Vui lòng chờ...