Sensitivity to environmental change of the treeline ecotone and its associated biodiversity in European mountains

Abstract

Transition zones between mountain forests and treeless tundra, i.e. treeline ecotones, are characterized by great regional variety. In this paper, we discuss the biodiversity in various trophic levels in treeline ecotones throughout Europe, with particular focus on recent changes in land use and climate in northern and central mountains. In northernmost Europe, mountain birch prevails, while conifers (spruce, pine, larch) are the dominating species further south. While at continent-wide to global scales, the ecotone position is largely controlled by heat deficiency, it depends on a multitude of partly interacting abiotic and biotic factors other than climate at smaller scales. Climate change is a driving factor in treeline ecotone change, including physiognomic structure and biodiversity, although the effects of climate and other factors often overlap. Historical legacy plays an important role in this respect, and human impacts are particularly important. The recent decline in pastoral use of many European treeline areas often strongly influences plant diversity and re-growth of trees and other woody species. Climate change together with changing tree cover may influence snow cover, moisture regime, and nutrient conditions. Subsequently changed site conditions influence plant−plant interactions, favoring some species and disfavoring others, and plant−animal interactions. Native animals may cause widespread or local disturbances in treeline ecotone areas. Mass outbreaks of leaf-eating insects, for example, usually affect comparatively large forested areas whereas mammalian herbivores and birds have more local impact. However, high numbers of wild or domestic mammalian herbivores may challenge the carrying capacity of treeline ecotone areas at the same time as they preserve an open pasture character. This calls for cross-disciplinary study approaches, addressing the complexity of the ecotone regarding both causal background and biogeographic diversity.

Elevational treeline and forest line dynamics in Norwegian mountain areas – a review

“…Moreover, age distribution in the two southernmost study areas reflects a rather stable (possibly progressive) treeline, while indicating a recessive treeline in the north. Such regional differences are also apparent in other European treeline ecotones (Wielgolaski et al 2017).…”

Drivers of treeline shift in different European mountains

“…The impact of climate change and the connected land use change on biodiversity and ecosystem services provision in several European countries is summarized by Wielgolaski et al (2017), and Kyriazopoulos et al (2017) (both this Special), and Sarkki et al (2016). One of the possible adaptive management options in response to climate change, assisted migration as human-assisted movement of species, has been frequently debated in the last few years (SteMarie et al 2011).…”

Evidence of effects of herbivory on Arctic vegetation: a systematic map protocol

“…Herbivory is a biotic interaction in tundra ecosystems that strongly influences the structure and dynamics of plant communities [1]. Herbivory interacts with climate change and has the potential to buffer some of the effects of warming in tundra, like increases in shrub cover [2] or advances in the tree line [3,4]. Furthermore, the distribution and abundance of herbivores in the Arctic are also strongly modified by climate change [5,6] and land use changes outside the Arctic [7,8], but also by management within the Arctic [9,10].…”