在淡水食物链中的物种特异性影响和热量转移
Hongyan Lin1, Yixuan Luo1, Lixia Li2
1SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou, 510006, China; School of Environment, South China Normal University, University Town, Guangzhou, 510006, China.
概括
(Se) 的生物积累和毒性在水生食物网中因物种而异. -L-氨酸 (Se-Met) 对大夫尼亚大的毒性比无机 (Se(IV)) 高.
科学领域:
- 环境化学环境化学
- 水生毒理学 水生毒理学
- 生态毒理学 生态毒理学
背景情况:
- (Se) 在水生生态系统中是必不可少的,但有毒的,在无机和有机形式之间转变.
- 了解Se物种在食物链中的生物积累和毒性至关重要,但有限.
研究的目的:
- 在微藻和大夫尼亚大藻中研究化 (Se(IV)) 和-L-氨酸 (Se-Met) 的差异性毒性和生物积累.
- 评估Se物种从藻类转移到D. magna. 的热带转移.
主要方法:
- 三种微藻物种在120小时内暴露在Se(IV) 或Se-Met (0-1000μg/L) 中.
- 大的食暴露于受Se污染的藻类 (1-50μg/L).
- 对藻类EC50的评估,生长,抗氧化生物标志物和Se生物积累.
- 对D. magna的毒性,生物积累和生殖效应的评估.
主要成果:
- 藻类对Se物种的敏感性各不相同,C. pyrenoidosa是最耐药的,S. capricornutum是最敏感的.
- 对于三种藻类中的两种,Se(IV) 毒性比Se-Met更强,但对D. magna.则Se-Met毒性更强.
- 在D. magna中的Se生物积累不受Se物种的影响,但Se-Met显著降低了后代产量.
结论:
- 藻类物种身份,而不是Se物种,主要影响了藻类生长和抗氧化剂反应.
- 通过饮食暴露,Se-Met对D. magna的繁殖风险比无机Se(IV) 更大.
- 这项研究强调了在水生食物网毒性评估中考虑Se物种和热带转移的重要性.
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