Limits...
A Modelling Framework to Assess the Effect of Pressures on River Abiotic Habitat Conditions and Biota.

Kail J, Guse B, Radinger J, Schröder M, Kiesel J, Kleinhans M, Schuurman F, Fohrer N, Hering D, Wolter C - PLoS ONE (2015)

Bottom Line: Moreover, these approaches do not consider long-term morphological changes that affect habitat conditions.Technically, it was possible to link the different models, but future applications would benefit from the development of open source software for all modelling steps to enable fully automated model runs.The modelling framework is flexible and allows for including additional models and investigating different research and management questions, e.g., in climate impact research as well as river restoration and management.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology and Ecology of Fishes, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Berlin, Germany; Department of Aquatic Ecology, University of Duisburg-Essen, Essen, Germany.

ABSTRACT
River biota are affected by global reach-scale pressures, but most approaches for predicting biota of rivers focus on river reach or segment scale processes and habitats. Moreover, these approaches do not consider long-term morphological changes that affect habitat conditions. In this study, a modelling framework was further developed and tested to assess the effect of pressures at different spatial scales on reach-scale habitat conditions and biota. Ecohydrological and 1D hydrodynamic models were used to predict discharge and water quality at the catchment scale and the resulting water level at the downstream end of a study reach. Long-term reach morphology was modelled using empirical regime equations, meander migration and 2D morphodynamic models. The respective flow and substrate conditions in the study reach were predicted using a 2D hydrodynamic model, and the suitability of these habitats was assessed with novel habitat models. In addition, dispersal models for fish and macroinvertebrates were developed to assess the re-colonization potential and to finally compare habitat suitability and the availability/ability of species to colonize these habitats. Applicability was tested and model performance was assessed by comparing observed and predicted conditions in the lowland Treene River in northern Germany. Technically, it was possible to link the different models, but future applications would benefit from the development of open source software for all modelling steps to enable fully automated model runs. Future research needs concern the physical modelling of long-term morphodynamics, feedback of biota (e.g., macrophytes) on abiotic habitat conditions, species interactions, and empirical data on the hydraulic habitat suitability and dispersal abilities of macroinvertebrates. The modelling framework is flexible and allows for including additional models and investigating different research and management questions, e.g., in climate impact research as well as river restoration and management.

No MeSH data available.


Local abiotic habitat conditions and river biota are affected by pressures at different spatial scales that potentially constrain reach-scale biota and restoration.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4482704&req=5

pone.0130228.g001: Local abiotic habitat conditions and river biota are affected by pressures at different spatial scales that potentially constrain reach-scale biota and restoration.

Mentions: In the modelling framework, the following pressures are considered: (i) discharge changes and (ii) water quality aspects (nutrient and fine sediment loads) due to climate and land-use changes at the global and catchment scale, respectively, (iii) habitat fragmentation and migration barriers at the river network scale, and (iv) reach-scale hydromorphological changes and habitat alterations (Fig 1). The pressures affect the abiotic habitat conditions and biota at the river network scale, and species become locally extinct, limiting the number of source populations and–in addition to migration barriers–the re-colonization potential at the reach scale (Fig 1). Different hydrological, hydraulic, morphological, and biological models are coupled (Fig 2) to assess the effect of different pressures on the abiotic habitat conditions and biota of a study reach given the (limited) re-colonization potential (Fig 1).


A Modelling Framework to Assess the Effect of Pressures on River Abiotic Habitat Conditions and Biota.

Kail J, Guse B, Radinger J, Schröder M, Kiesel J, Kleinhans M, Schuurman F, Fohrer N, Hering D, Wolter C - PLoS ONE (2015)

Local abiotic habitat conditions and river biota are affected by pressures at different spatial scales that potentially constrain reach-scale biota and restoration.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4482704&req=5

pone.0130228.g001: Local abiotic habitat conditions and river biota are affected by pressures at different spatial scales that potentially constrain reach-scale biota and restoration.
Mentions: In the modelling framework, the following pressures are considered: (i) discharge changes and (ii) water quality aspects (nutrient and fine sediment loads) due to climate and land-use changes at the global and catchment scale, respectively, (iii) habitat fragmentation and migration barriers at the river network scale, and (iv) reach-scale hydromorphological changes and habitat alterations (Fig 1). The pressures affect the abiotic habitat conditions and biota at the river network scale, and species become locally extinct, limiting the number of source populations and–in addition to migration barriers–the re-colonization potential at the reach scale (Fig 1). Different hydrological, hydraulic, morphological, and biological models are coupled (Fig 2) to assess the effect of different pressures on the abiotic habitat conditions and biota of a study reach given the (limited) re-colonization potential (Fig 1).

Bottom Line: Moreover, these approaches do not consider long-term morphological changes that affect habitat conditions.Technically, it was possible to link the different models, but future applications would benefit from the development of open source software for all modelling steps to enable fully automated model runs.The modelling framework is flexible and allows for including additional models and investigating different research and management questions, e.g., in climate impact research as well as river restoration and management.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology and Ecology of Fishes, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Berlin, Germany; Department of Aquatic Ecology, University of Duisburg-Essen, Essen, Germany.

ABSTRACT
River biota are affected by global reach-scale pressures, but most approaches for predicting biota of rivers focus on river reach or segment scale processes and habitats. Moreover, these approaches do not consider long-term morphological changes that affect habitat conditions. In this study, a modelling framework was further developed and tested to assess the effect of pressures at different spatial scales on reach-scale habitat conditions and biota. Ecohydrological and 1D hydrodynamic models were used to predict discharge and water quality at the catchment scale and the resulting water level at the downstream end of a study reach. Long-term reach morphology was modelled using empirical regime equations, meander migration and 2D morphodynamic models. The respective flow and substrate conditions in the study reach were predicted using a 2D hydrodynamic model, and the suitability of these habitats was assessed with novel habitat models. In addition, dispersal models for fish and macroinvertebrates were developed to assess the re-colonization potential and to finally compare habitat suitability and the availability/ability of species to colonize these habitats. Applicability was tested and model performance was assessed by comparing observed and predicted conditions in the lowland Treene River in northern Germany. Technically, it was possible to link the different models, but future applications would benefit from the development of open source software for all modelling steps to enable fully automated model runs. Future research needs concern the physical modelling of long-term morphodynamics, feedback of biota (e.g., macrophytes) on abiotic habitat conditions, species interactions, and empirical data on the hydraulic habitat suitability and dispersal abilities of macroinvertebrates. The modelling framework is flexible and allows for including additional models and investigating different research and management questions, e.g., in climate impact research as well as river restoration and management.

No MeSH data available.