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Effects of locality and stone surface structure on the distribution of Collembola inhabiting a novel habitat – the stone-ice border on an alpine glacier
Acta Oecologica ( IF 1.3 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.actao.2020.103629
Jakub Buda , Roberto Sergio Azzoni , Roberto Ambrosini , Andrea Franzetti , Krzysztof Zawierucha

Supraglacial zones worldwide serve as suitable habitats for psychrophiles, including metazoans. The present study investigates whether the occurrence and abundance of springtails in water films under stones on the Forni Glacier in the Alps is affected by: a) the stone's location (on bare ice, in supraglacial streams, in the glacier forefield, on the medial moraine), b) the stone's distance from the glacier terminus, c) the roughness of the stone's surface, and d) the stone's position with respect to the surface of the ice (inclination). The Forni Glacier is inhabited by representatives of dark-pigmented Isotomidae. The study demonstrates that the density of springtails inhabiting the underside of stones located on the ice came to 155,000 individuals per one square meter of a stone surface with their abundance showing no relation to the stones' distance from the glacier terminus. Moreover, springtails occurred more frequently and more abundantly under stones located on bare ice than under those in supraglacial streams, the medial moraine or the glacier forefield. The roughness of stone surface facing the ice had a positive effect on animal counts, while its inclination had no strong effect. We estimated that the total abundance of springtails under stones on the Forni Glacier's tongue may reach 10.8 million individuals. Since many springtails are hidden in supraglacial gravel and medial moraine, the dry biomass of animals visible under stones comprises at least 105.7 g.



中文翻译:

局部性和石头表面结构对居住在一个新栖息地的Collembola分布的影响-高山冰川上的石冰边界

全世界冰川上地区是包括后生动物在内的嗜冷者的合适栖息地。本研究调查了阿尔卑斯山福尔尼冰川上石头下面水膜中的跳尾的发生和丰富程度是否受到以下因素的影响:a)石头的位置(在裸冰上,冰川流中,在冰川前场中,在冰on内侧) ),b)石头与冰川终点的距离,c)石头表面的粗糙度和d)石头相对于冰面的位置(倾斜度)。弗尼冰川(Forni Glacier)居住着深色色素异mid科的代表。研究表明,居住在冰上石头下面的跳尾密度达到155,每1平方米的石头表面有000个人,其丰富程度与石头与冰川终点的距离无关。而且,跳尾在裸露冰上的石头下发生的频率比在冰川河,内侧冰ora或冰川前场中的发生的频率更高,发生频率也更高。面对冰的石头表面的粗糙度对动物的数量有积极的影响,而其倾斜度则没有很大的影响。我们估计,福尔尼冰川舌头上的石头下面的跳尾鱼总数可能达到1,080万。由于许多跳尾类动物被藏在冰砾石和冰m内侧,因此石头下可见的动物干生物量至少为105.7 g。在裸露的冰上,跳尾发生的频率比冰川河,内侧冰ora或冰川前场的跳动更频繁,更丰富。面对冰的石头表面的粗糙度对动物的数量有积极的影响,而其倾斜度则没有很大的影响。我们估计,福尔尼冰川舌头上的石头下面的跳尾鱼总数可能达到1,080万。由于许多跳尾类动物被藏在冰川上砾石和冰m内侧,因此石头下可见的动物干生物量至少为105.7 g。在裸露的冰上,跳尾比在冰川河,内侧冰media或冰川前场中的跳跳更频繁,更丰富。面对冰的石头表面的粗糙度对动物的数量有积极的影响,而其倾斜度则没有很大的影响。我们估计,福尔尼冰川舌头上的石头下面的跳尾鱼总数可能达到1,080万。由于许多跳尾类动物被藏在冰砾石和冰m内侧,因此石头下可见的动物干生物量至少为105.7 g。而它的倾斜度没有太大作用。我们估计,福尔尼冰川舌头上的石头下面的跳尾鱼总数可能达到1,080万。由于许多跳尾类动物被藏在冰砾石和冰m内侧,因此石头下可见的动物干生物量至少为105.7 g。而它的倾斜度没有太大影响。我们估计,福尔尼冰川舌头上的石头下面的跳尾鱼总数可能达到1,080万。由于许多跳尾类动物被藏在冰砾石和冰m内侧,因此石头下可见的动物干生物量至少为105.7 g。

更新日期:2020-09-23
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