CROSSLINK: Cross-habitat linkages between stream and riparian habitats
Last changed: 07 November 2018
CROSSLINK is a research project aiming at improved understanding of aquatic-terrestrial and longitudinal linkages in stream networks. These linkages are essential for sustaining biodiversity and key ecosystem services such as nutrient cycling, flood mitigation, and freshwater provision. However, human activities such as agriculture and hydropower generation frequently degrade these coupled ecosystems. Therefore, the results of CROSSLINK will be used to optimize management of biodiversity, ecosystem services, and multiple human uses at the land-water interface.
Stream-riparian networks are key components of green and blue infrastructure (GBI) that underpin landscape integrity by transporting nutrients, regulating floods, buffering human impacts and supplying fresh water. Unfortunately, stream-riparian networks are also subject to multiple human pressures (e.g,. from hydropower and agriculture) that affect longitudinal and lateral connectivity, driving habitat and diversity losses, threatening ecosystem services, and causing stakeholder conflicts. Thus, there is a pressing need to understand the importance of connectivity within these networks, and to apply this understanding in managing stream-riparian GBI for both natural values and societal needs.
This section of the river Dalälven in Färnebofjärdens nationalpark, Sweden shows the intimate link between coupled riparian and stream ecosystems. Photo: F. J. Burdon.
Overhanging riparian vegetation provides habitat both for the adult stages of aquatic insects, and for terrestrial consumers of aquatic insects. Photo: Brendan Mckie
Mosupsbäcken, Sweden: a linked forest-stream ecosystem in winter. Photo: Brendan Mckie
Dams and weirs are a major cause of longitudinal (upstream-downstream) discontinuity in stream-riparian networks. Photo: Frauke Ecke.
Dam removals are one type of management action that can improve longitudinal connectivity. Photo: Frauke Ecke
Water-level fluctuations due to river regulation alter the hydrological relationship between rivers and their adjacent riparian zones. Photo: Frauke Ecke.
Beaver dams and the associated impoundments and beaver meadows are natural drivers of altered longitudinal and later connectivity in stream-riparian networks. Photo: Frauke Ecke.
CROSSLINK aims to
- evaluate how the extent, spatial arrangement, and connectivity of riparian-stream GBI affects biodiversity, ecosystem functioning, ecosystem services, and resilience indicators in forested, urban and rural settings, and
- to produce an optimization framework capable of balancing multiple values, uses and needs with longer term adaptive capacity and resilience in riparian-stream GBI.
Case studies to be used in CROSSLINK
CROSSLINK will analyse existing data and policies on stream-riparian GBI and conduct extensive novel and spatially explicit ﬁeld studies in four case-study basins:
- Norway (forested and urban stream reaches in the Oslo Fjord basin),
- Sweden (forested and agricultural stream reaches in the Lake Mälaren basin),
- Belgium (forested, agricultural and urban reaches in the Scheldt river basin), and
- Romania (forested and agricultural reaches in catchments of the Arges steppes).
CROSSLINK will analyse existing data and conduct extensive novel and spatially explicit field studies. A portfolio of key ecosystem assets for stream-riparian networks will be constructed, comprising biodiversity, ecosystem processes and services, and flood protection and resilience properties. Relationships between the portfolio elements, spatial connectivity and human impacts are analysed and incorporated into an optimisation platform, which identifies spatial configurations and strategies for GBI that minimize management trade-offs and maximize multifunctionality.
Key outcomes of CROSSLINK
The explanatory power of these approaches is compared and contrasted, leading to identiﬁcation and reﬁnement of optimal connectivity measures at both local and whole network scales. Relationships between the portfolio elements and spatial connectivity and multiple human uses and impacts are analysed, and incorporated into an optimisation models which focus on identifying spatial conﬁgurations and strategies for GBI that minimize trade-offs in management while maximising multifunctionality from local to landscape scales.
The main ﬁndings from CROSSLINK, including optimal solutions for GBI planning, will be translated into a learning-based environment allowing stakeholder analysis of tradeoffs/synergies between multiple values/goals in the management and design of stream-riparian GBI.
Project partners involved in CROSSLINK
Map of the participant countries in CROSSLINK. Yellow countries are those involved in data collection and analysis, whilst Germany in pink contributes an optimization framework for design of a multifunctional stream-riparian green-blue infrastracture.
CROSSLINK is funded through BiodivERsA, under the Horizon 2020 ERA-NET COFUND scheme.
Full project title: CROSSLINK - Understanding cross-habitat linkages between blue and green infrastructure to optimize management of biodiversity, ecosystem services and multiple human uses
Keywords: Riparian-stream, green-blue infrastructure, biodiversity, ecosystem functioning, ecosystem services, resilience, ecological connectivity, optimal solutions, portfolio, learning environment
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