评估北极狐对海洋补贴的利用情况;稳定同位素的启示

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
Anders Angerbjörn, Kerstin Lidén, James D. Roth, Fredrik Dalerum
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引用次数: 0

摘要

苔原生态系统的营养结构通常被视为当地陆地初级生产力的结果。然而,其他资源可以通过远距离移民带来,也可以在沿海地区直接获取。因此,营养结构可能会偏离基于当地陆地资源的预测。北极狐(Vulpes lagopus)是一种小型犬科动物,可能会利用可获得的海洋资源。我们利用北极狐毛皮中的稳定同位素值和有关潜在猎物的文献数据,评估了北极狐在没有沿海通道的高山苔原上的夏季资源利用情况。当地猎物(可能主要是啮齿类动物)对北极狐食物的贡献随着啮齿类动物数量的减少而下降,随后依赖海洋资源的迁徙性猎物的贡献增加。在啮齿动物数量较多的年份,该陆地地区与可直接通往海岸的地区的稳定同位素值没有差异,但在啮齿动物数量较少的年份,同位素值表明,与主要以海洋猎物为食的沿海种群相比,海洋输入较少。我们的研究表明,海洋资源可能被没有任何海岸通道的地区的动物所利用,我们强调,这种生态系统的部分耦合必须纳入冻原环境的建模和评估中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluating the use of marine subsidies by Arctic foxes without direct coastal access; insights from stable isotopes

Evaluating the use of marine subsidies by Arctic foxes without direct coastal access; insights from stable isotopes

The trophic structures of tundra ecosystems are often viewed as a result of local terrestrial primary productivity. However, other resources can be brought in through long-distant migrants or be directly accessible in coastal areas. Hence, trophic structures may deviate from predictions based on local terrestrial resources. The Arctic fox (Vulpes lagopus) is a small canid that may use marine resources when available. We used stable isotope values in Arctic fox fur and literature data on potential prey to evaluate Arctic fox summer resource use in a mountain tundra without coastal access. The dietary contribution of local prey, presumably mostly rodents, declined with declining rodent abundance, with a subsequent increased contribution of migratory prey relying on marine resources. Stable isotope values did not differ between this terrestrial area and an area with direct coastal access during years of high rodent abundance, but isotope values during low rodent abundances suggested less marine input than in a coastal population feeding primarily on marine prey. Our study shows that marine resources may be used by animals in areas without any coastal access, and we highlight that such partial coupling of ecosystems must be included in the modeling and assessments of tundra environments.

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来源期刊
Polar Biology
Polar Biology 生物-生态学
CiteScore
3.60
自引率
11.80%
发文量
116
审稿时长
3-8 weeks
期刊介绍: Polar Biology publishes Original Papers, Reviews, and Short Notes and is the focal point for biologists working in polar regions. It is also of interest to scientists working in biology in general, ecology and physiology, as well as in oceanography and climatology related to polar life. Polar Biology presents results of studies in plants, animals, and micro-organisms of marine, limnic and terrestrial habitats in polar and subpolar regions of both hemispheres. Taxonomy/ Biogeography Life History Spatio-temporal Patterns in Abundance and Diversity Ecological Interactions Trophic Ecology Ecophysiology/ Biochemistry of Adaptation Biogeochemical Pathways and Cycles Ecological Models Human Impact/ Climate Change/ Conservation
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