摘要
为了探索外来种池蝶蚌引入的生态风险,对池蝶蚌(C)与三角帆蚌(S)及其杂交种正交F1(三角帆蚌♀×池蝶蚌♂,SC)、反交F1(池蝶蚌♀×三角帆蚌♂,CS)幼蚌的低氧、干露和重金属汞耐受力进行了比较研究。结果表明:4种幼蚌对低氧、干露和重金属汞均有不同程度的耐受能力。其中CS的窒息点最低(0·92mg·L-1),对低氧的耐受力最强,其次是C和SC,窒息点分别为1·04和1·10mg·L-1,S窒息点最高(1·31mg·L-1),方差分析表明S与其它3种差异均极显著(P<0·01),耐低氧能力最弱。C、SC和CS的干露耐受力无明显差异,但要显著强于S(P<0·01)。根据4种幼蚌72h和96h对汞的半致死浓度的耐受力由强至弱依次为C>CS>SC>S。表明池蝶蚌的耐受力显著强于三角帆蚌,今后应加强对池蝶蚌的监控和防范力度,以避免对中国的特有种三角帆蚌构成生存威胁。
The tolerance of alien species Hyriopsis schlegeli （C） , native species H. cumingii （S） , and their reciprocal hybrids F1 SC and CS to low dissolved oxygen, drying condition and heavy metal Hg was studied to evaluate the ecological risk of introducing alien species H. schlegeli. The results indicated that CS had the strongest tolerance to low dissolved oxygen, with its asphyxia point being 0.92 mg · L^- 1, followed by C and SC , with their asphyxia point being 1.04 mg ·L^-1 and 1.10 mg ·L^-1, respectively, while S had the weakest tolerance to low dissolved oxygen, with its asphyxia point being 1.31 mg · L^-1. In this aspect, S had significant differences （P 〈0.01 ） with the others. No significant difference was observed on the tolerance to drying condition between H. schlegeli and its reciprocal hybrids F1. but there existed significant difference between H. cumingii and the others. The tolerance to heavy metal Hg was in the order of C 〉 CS 〉 SC 〉 S, judging from the median-lethal concentration of Hg^2＋. It could be concluded that alien species H. schlegelii had a stronger tolerance than native species H. cumingii, and the inspection and precaution of H. schlegeli should be strengthened to avoid its threatening the survival of H. cumingii.
出处
《生态学杂志》
CAS
CSCD
北大核心
2007年第7期1080-1084,共5页
Chinese Journal of Ecology
基金
农业部"948"项目(2004-Z44)
农业部农业结构调整重大技术研究专项(06-05-05B)
国家科技支撑计划资助项目(2006BAD01A13)
上海市科委基础重大项目(06DJ14003)
关键词
池蝶蚌
三角帆蚌
杂种F1
耐受力
生态因子
Hyriopsis schlegeli
Hyriopsis cumingii
hybrids F1
tolerance
ecological factors.
