ORCID Profile
0000-0003-1767-7010
Current Organisation
Umeå University
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Publisher: Wiley
Date: 08-12-2008
Publisher: Wiley
Date: 04-2007
DOI: 10.1890/06-0343
Abstract: Fluvial processes such as flooding and sediment deposition play a crucial role in structuring riparian plant communities. In rivers throughout the world, these processes have been altered by channelization and other anthropogenic stresses. Yet despite increasing awareness of the need to restore natural flow regimes for the preservation of riparian bio ersity, few studies have examined the effects of river restoration on riparian ecosystems. In this study, we examined the effects of restoration in the Ume River system, northern Sweden, where tributaries were channelized to facilitate timber floating in the 19th and early 20th centuries. Restoration at these sites involved the use of heavy machinery to replace instream boulders and remove floatway structures that had previously lined stream banks and cut off secondary channels. We compared riparian plant communities along channelized stream reaches with those along reaches that had been restored 3-10 years prior to observation. Species richness and evenness were significantly increased at restored sites, as were floodplain inundation frequencies. These findings demonstrate how river restoration and associated changes in fluvial disturbance regimes can enhance riparian bio ersity. Given that riparian ecosystems tend to support a disproportionate share of regional species pools, these findings have potentially broad implications for bio ersity conservation at regional or landscape scales.
Publisher: Wiley
Date: 30-07-2014
DOI: 10.1111/NPH.12951
Abstract: Riparian vegetation is exposed to stress from inundation and hydraulic disturbance, and is often rich in native and alien plant species. We describe 35 traits that enable plants to cope with riparian conditions. These include traits for tolerating or avoiding anoxia and enabling underwater photosynthesis, traits that confer resistance and resilience to hydraulic disturbance, and attributes that facilitate dispersal, such as floating propagules. This ersity of life‐history strategies illustrates that there are many ways of sustaining life in riparian zones, which helps to explain high riparian bio ersity. Using community assembly theory, we examine how adaptations to inundation, disturbance and dispersal shape plant community composition along key environmental gradients, and how human actions have modified communities. Dispersal‐related processes seem to explain many patterns, highlighting the influence of regional processes on local species assemblages. Using alien plant invasions like an (uncontrolled) experiment in community assembly, we use an A ustralian and a global dataset to examine possible causes of high degrees of riparian invasion. We found that high proportions of alien species in the regional species pools have invaded riparian zones, despite not being riparian specialists, and that riparian invaders disperse in more ways, including by water and humans, than species invading other ecosystems. Contents Summary 19 I. Introduction 19 II. Functional traits and life‐history adaptations of riparian plants 20 III. Local and regional patterns in the distribution of riparian plants 24 IV. Alien plant invasion in riparian zones 26 V. Modification and management of riparian plant communities 30 VI. Conclusions and future research 32 Acknowledgements 33 References 33
Publisher: Wiley
Date: 28-07-2022
DOI: 10.1002/WAT2.1604
Abstract: Riparian zones are the paragon of transitional ecosystems, providing critical habitat and ecosystem services that are especially threatened by global change. Following consultation with experts, 10 key challenges were identified to be addressed for riparian vegetation science and management improvement: (1) Create a distinct scientific community by establishing stronger bridges between disciplines (2) Make riparian vegetation more visible and appreciated in society and policies (3) Improve knowledge regarding bio ersity—ecosystem functioning links (4) Manage spatial scale and context‐based issues (5) Improve knowledge on social dimensions of riparian vegetation (6) Anticipate responses to emergent issues and future trajectories (7) Enhance tools to quantify and prioritize ecosystem services (8) Improve numerical modeling and simulation tools (9) Calibrate methods and increase data availability for better indicators and monitoring practices and transferability and (10) Undertake scientific validation of best management practices. These challenges are discussed and critiqued here, to guide future research into riparian vegetation. This article is categorized under: Water and Life Nature of Freshwater Ecosystems Water and Life Stresses and Pressures on Ecosystems Water and Life Conservation, Management, and Awareness
No related grants have been discovered for Roland Jansson.