大型无脊椎动物群落如何应对南阿尔卑斯山脉冰川影响的下降?

IF 1.2 4区 环境科学与生态学 Q4 LIMNOLOGY Limnetica Pub Date : 2022-01-15 DOI:10.23818/limn.41.10
Daniele Debiasi, A. Franceschini, F. Paoli, V. Lencioni
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引用次数: 2

摘要

大型无脊椎动物群落如何应对南阿尔卑斯山脉冰川影响的下降?2018年夏天,我们比较了由退缩的冰川补给的四条溪流和意大利阿尔卑斯山一个亲冰川池塘的大型无脊椎动物群落。总的目的是确定由不同表面积的冰川提供的栖息地是否沿着纵向梯度拥有不同的群落,并确定哪些环境变量可以预测这些差异。根据冰川指数(GI,范围0-1),选择了8个具有不同冰川影响的采样点。该指数考虑了距冰川口和冰川表面积的距离。五个被归类为克里奥尔,主要由冰融化提供食物,位于吻部1公里以内;两个为冰川水刺,贡献混合,距离吻部>1公里;其中一个是亲冰川池塘,位于距离吻部50米以内,由冰川融化提供食物。摇蚊目是最常见(100%)和最丰富的分类群(80%),其次是EPT(蜉蝣目、Plecoptera、Trichoptera),占总丰度的9%。除C0外,所有克里奥尔位点(MA1、CR0、CR1、AG1)均以摇蚊目为主(>98%),C0的群落与冰川rhithral位点(C2、CR2)相似,后者更为多样化,约60%的群落由摇蚊目组成。虽然C0主要由冰融化补给,但由于补给冰川的面积较小(0.14公顷),其GI(0.3)低于其他氪地点(0.5-1.0)。这些结果强调,冰川表面积影响底栖动物群,在对不同类型的地点进行分类时应考虑GI。通过基于距离的冗余分析(dbRDA),GI也被选为动物区系变化的最佳预测因子之一,该分析旨在研究分类群分布与环境条件之间的关系,以及最高水温和叶绿素a浓度的值。总的来说,这项研究为不同的冰川影响如何影响淡水栖息地的大型无脊椎动物群落提供了新的见解。
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How do macroinvertebrate communities respond to declining glacial influence in the Southern Alps?
How do macroinvertebrate communities respond to declining glacial influence in the Southern Alps? In the summer of 2018, we compared the macroinvertebrate communities of four streams fed by retreating glaciers and of one pro-glacial pond in the Italian Alps. The general aim was to determine if habitats fed by glaciers with different surface areas host different communities along a longitudinal gradient and to identify which environmental variables can predict these differences. Eight sampling sites were selected with different glacial influences given by the Glacial Index (GI, range 0-1). This index takes into consideration the distance from the snout and glacier surface area. Five were classified as kryal, fed mainly by ice melt and lay within 1 km of the snout; two as glacio-rhithral, with mixed contributions and > 1 km from the snout; and one as a pro-glacial pond, which lays within 50 m from the snout and was fed by ice melt. Chironomids were the most frequent (100 %) and abundant taxa (80 %), followed by EPT (Ephemeroptera, Plecoptera, Trichoptera) which represented 9 % of total abundance. All kryal sites (MA1, CR0, CR1, AG1) were dominated by chironomids (> 98 %), except for C0, which hosts a community resembling that of glacio-rhithral sites (C2, CR2), which are more diversified and have approximately 60 % of their communities composed of chironomids. While C0 is fed mainly by ice-melt, its GI was lower (0.3) than that of the other kryal sites (0.5-1.0) because of the small size of the feeding glacier (0.14 ha). These results emphasise that the glacier surface area affects the benthic fauna and that the GI should be considered when classifying different types of sites. GI was also selected as one of the best predictors of faunal changes by distance-based redundancy analysis (dbRDA), which was performed to investigate the relationships between taxa distribution and environmental conditions, along with the values of maximum water temperature and chlorophyll a concentration. Overall, this study provides new insights into how different glacial influences affect the macroinvertebrate communities of freshwater habitats.
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来源期刊
Limnetica
Limnetica LIMNOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
3.70
自引率
7.10%
发文量
26
审稿时长
>12 weeks
期刊介绍: Limnetica publishes original research articles on the ecology of inland waters. The scope of Limnetica includes the ecology of rivers, lakes, reservoirs, coastal lagoons and wetlands, as well as biogeochemistry, paleolimnology, development of new methodologies, taxonomy, biogeography and any aspect of theoretical and applied continental aquatic ecology such as management and conservation, impact assessment, ecotoxicology and pollution. Limnetica will accept for its publication scientific articles presenting advances in knowledge or technological development, as well as as papers derived from new practical approaches on the topics covered by the journal.
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