亚热带专家主导着一个珊瑚范围扩张前线
Fiona Chong1,2,3, Giun Yee Soong4, Agus Alim Hakim2,5
1Energy and Environment Institute, University of Hull, Hull, UK.
概括
珊瑚宿主-共生体特异性限制了范围的扩张,热带珊瑚进入高度珊瑚礁. 热带Pocillopora珊瑚及其共生生物从日本大陆缺席,质疑珊瑚的热带化.
科学领域:
- 海洋生物学 海洋生物学
- 珊瑚礁生态 珊瑚礁生态
- 这种共生是共生.
背景情况:
- 珊瑚宿主-共生关系对于珊瑚的生长和生存至关重要,影响潜在的范围扩张.
- 在更高度的珊瑚覆盖面的增加已经观察到,但珊瑚及其共生体的身份尚未得到充分记录.
- 了解这些关系是预测珊瑚对气候变化和极地范围变化的反应的关键.
研究的目的:
- 研究沿热带温带环境梯度沿着斯克拉克提尼亚珊瑚宿主和Symbiodiniaceae共生物多样性的变化.
- 使用Pocillopora spp. 的方法 和它们的共生体作为评估极向范围扩张的模型.
- 确定共生体在珊瑚的潜在范围扩张中的作用.
主要方法:
- 收集的珊瑚组织来自23条沿着库罗西奥流的珊瑚礁,从伊里奥莫特南部 (24°N) 到日本大陆北部 (33°N).
- 通过测序线粒体开放阅读框架 (mtORF) 来识别珊瑚宿主.
- 通过使用内部转录间隔器2 (ITS2) 区域的下一代测序来确定共生物身份.
主要成果:
- 在Sata角 (30°N) 北方观察到,Pocillopora单元类型的显著减少和主导的共生类型的转变.
- 在日本大陆的遗址上没有热带Pocillopora类型.
- 在亚热带Pocillopora和Cladocopium共生类型之间发现了高宿主特异性.
结论:
- 这些发现挑战了"珊瑚热带化"的程度和珊瑚范围扩张前线的位置.
- 高度珊瑚的高宿主-共生体特异性表明热带动物藻类珊瑚的生存能力有限.
- 热带珊瑚的北极扩张可能受到特定宿主-共生体关联的限制.
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