草动物对社区结构的直接和间接影响
Kristie Rigby1, Elisa Berdalet2, Carina Berglund1
1Department of Marine Sciences, University of Gothenburg, Carl Skottsbergs gata 22B, Gothenburg 41319, Sweden.
Journal of plankton research
|October 3, 2024
概括
类牧草动物通过直接的掠食和间接的化学信号对海洋浮游生物群落产生影响. 了解这些综合效应对于全面了解浮游生物群落结构和功能至关重要.
科学领域:
- 海洋生态海洋生态学
- 浮游生物生态 植物生态学
- 社区生态学社区生态学
背景情况:
- 牧草动物对海洋浮游生物的直接放牧影响得到了充分证实.
- 草食动物对浮游生物群体的间接,非致命影响仍然不太清楚.
- 在浮游生物食物网中解开直接和间接的影响是具有挑战性的.
研究的目的:
- 评估足草食动物对海洋社区结构和功能的间接影响.
- 隔离和确定化学警报线索 (copepodamides) 在构建浮游生物群落中的作用.
- 为了比较直接放牧与间接化学线索的影响.
主要方法:
- 控制的实验暴露完整的春季和夏季植物浮游生物群落,要么直接copepod放牧或孤立的化学警报线索 (copepodamides).
- 通过测量叶绿素和初级生产来评估生态系统功能.
- 使用18S (真核生物) 和16SrRNA (核核生物) 的元编码进行社区成分分析.
- 尺寸结构分析以确定对生物体尺寸的影响.
主要成果:
- 直接放牧对生态系统功能 (叶绿素,初级生产) 的影响中等.
- 直接放牧和copepodamide暴露都改变了真核生物和 prokaryote 社区的组成.
- 尺寸结构分析表明,在直接和间接影响下,更喜欢较小的生物 (<10-15微米).
- 超级编码显示,由于牧场和化学线索,社区结构发生了重大变化.
结论:
- 对植物浮游生物群落的Copepod结构效应是由直接和间接机制的组合产生的.
- 这项研究首次试图分离足动物的间接影响,强调了化学线索的重要性.
- 为了全面了解消费者对生态系统的影响,需要考虑直接和间接的生态影响.
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