评估两种关键的南极皮动物的适应能力,以清新沿海
Nicholas J Barrett1, Elizabeth M Harper1, Lloyd S Peck2
1British Antarctic Survey, Natural Environment Research Council, Cambridge CB3 0ET, UK; Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK.
The Science of the total environment
|February 20, 2025
概括
南极皮动物,如海星和海刺,可以适应降低的盐度 (29‰),但在较低的盐度 (24‰) 难以适应. 在24‰的温度下,长期生存不太可能,对南极的生态系统产生影响.
科学领域:
- 海洋生物学 海洋生物学
- 气候变化 生态学 生态学
- 南极海洋生态系统 南极海洋生态系统
背景情况:
- 由于气候变化,南大洋的沿海清新正在增加.
- 盐度降低对本土南极海洋生物造成了重大环境压力.
- 南极皮动物适应较低盐度的能力在很大程度上是未知的.
研究的目的:
- 研究关键南极皮动物对预计的低盐度条件的适应能力.
- 评估选择物种对盐度降低的生理和行为反应.
- 预测气候变化引起的盐度变化对南极海洋食物网的潜在影响.
主要方法:
- 海星Odontaster validus和海刺Sterechinus neumayeri在71天以上的时间内暴露于降低的盐度 (29‰和24‰).
- 从34.5‰的控制盐度逐步稀释.
- 监测养,便产量,活动系数,氧气消耗和骨液参数.
主要成果:
- 在两种物种中,养,便产量和活动系数都受到24‰的显著影响,没有恢复到控制水平.
- 氧气消耗在85日之前保持稳定,然后在S. neumayeri的24‰时显著增加.
- 证明29‰成功适应,而24‰的高生存率伴随着质量减少和指标无法正常化,表明长期生存不太可能.
结论:
- 南极皮动物具有一定的承受盐度降低的能力,在29‰时观察到成功的适应.
- 由于显著的生理影响和缺乏恢复,24‰的生存是有问题的,这表明潜在的长期后果.
- 这些发现凸显了未来气候情景下南极食物网和生态相互作用的潜在破坏.
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