侵入性影响Salmo trutta的幼年生命史特征,在与非本地菌株种植后的几代人
Dorte Bekkevold1, Francois Besnier2, Thomas Frank-Gopolos1
1National Institute of Aquatic Resources Technical University of Denmark Silkeborg Denmark.
Evolutionary applications
|July 4, 2024
概括
化场鱼的侵入促进了棕鱼的生长,特别是在更高的温度下. 这种增加的增长潜力即使在野外几代人之后也持续存在,这突显了野生种群的风险.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 水产养殖是水产养殖的一种方式.
背景情况:
- 非本地同类物种的侵入可能会破坏当地适应性,并降低野生种群的健康状况.
- 对野生种群内进化的遗传影响的长期研究很少.
- 棕鱼 (Salmo trutta) 种群经常受到养化鱼的养殖.
研究的目的:
- 调查养化室鱼对野生种群的长期影响.
- 评估化室添加剂,生长和棕鱼养殖温度之间的关系.
- 确定混合野生种群中改变生长潜力的持久性.
主要方法:
- 进行了一项普通花园实验,使用22个棕鱼家族,不同程度的化场/野生混合物.
- 鱼从第一次养到23周,在三个不同的温度 (7,12和16°C) 中养.
- 在实验结束时,测量了基因添加剂水平和鱼的尺寸.
主要成果:
- 在家庭添加剂和鱼类大小之间观察到显著的正相关性.
- 混合物对尺寸的这种影响在更高的养殖温度下更加明显.
- 尽管缺乏故意选择生长,但化场菌株的增长潜力显而易见.
结论:
- 由于无意的选择,化场鱼的生长可能会增加,特别是对于在更高的温度下表现.
- 由于内进的增长潜力在野生种群中持续存在,即使在自然选择之后.
- 由于内进而改变的生长模式对野生鱼种群构成重大风险,特别是在气候变化的背景下.
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