冬季温度和暴露时间之间的相互作用可能构成北极微关节动物群落的结构
Stephen James Coulson1, Peter Convey2, Sil Schuuring1
1Department of Arctic Biology, University Centre in Svalbard, Pb.156, Longyearbyen, Svalbard, 9171, Norway.
Journal of thermal biology
|June 21, 2023
概括
北极的微关节动物,如科伦博拉,耐受寒冷,但在没有雪的情况下,死亡率低于-30°C. 长时间暴露于寒冷会影响生存,虫的虫表现出更高的弹性. 雪的深度是北极土壤动物生存的关键.
科学领域:
- 生态生态学 生态生态学
- 北极生物学 北极生物学
- 土壤科学 土壤科学
背景情况:
- 北极陆地生态系统拥有多样化的微关节动物,对土壤分解和授粉等过程至关重要.
- 这种动物对北极冬季条件具有自然耐受性,在土壤和植被中过冬.
- 快速的北极变暖和斯瓦尔巴德等地区的降雨模式变化对这些过冬的微关节动物构成威胁.
研究的目的:
- 在模拟的冬季条件下调查北极微关节动物的寒冷耐受性极限.
- 评估雪地覆盖和长期暴露于寒冷对微关节动物生存和种群动态的影响.
- 了解环境变化如何影响北极土壤动植物的分布和功能.
主要方法:
- 一个操纵实验使用积雪包适度土壤温度,结合延长化器处理在-6°C和-25°C.
- 在不同的温度和雪地覆盖场景下,监测各种微关节动物群体的死亡率,包括Collembola和oribatid虫.
- 记录北极土壤中其他无脊椎动物幼虫和成人的生存情况.
主要成果:
- 在没有雪的地区,当土壤温度下降到-30°C以下时,Collembola的死亡率显著.
- 长时间暴露在-6°C下12个月导致Collembola的额外死亡率,而oribatid虫显示出高耐药性.
- 其他无脊椎动物,如幼虫 (Nematocera,Brachycera),海米普特拉,科勒奥普特拉和Araneae也在不同的条件下幸存下来.
结论:
- 雪深和冬季空气温度是北极土壤微关节动物种群和生态系统运作的关键调节因素.
- 极地地区持续的环境变化将继续改变这种动物的分布和生存.
- 微关节动物群体之间的不同耐受性表明,北极土壤社区的组成和功能可能会发生变化.
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