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Generic GDE concepts for the TMG

Generic GDE concepts for the TMG. Regional to landscape scale systems. Landscape to habitat scale systems. Discharge regime (structurally controlled). Constant. Highly variable. Perched springs & wetlands (type 1). Fracture controlled springs & wetlands (type 2).

galvin-dudley
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Generic GDE concepts for the TMG

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  1. Generic GDE concepts for the TMG

  2. Regional to landscape scale systems

  3. Landscape to habitat scale systems

  4. Discharge regime (structurally controlled) Constant Highly variable Perched springs & wetlands (type 1) Fracture controlled springs & wetlands (type 2) Lithology controlled (contact) springs & wetlands (type 3) Aquatic (riverine) ecosystems Terrestrial ecosystems Cave ecosystems Resilience to natural climatic variation Low High Species & ecosystems Specialist Generalist

  5. Resilience • How has the system varied over long time scales – years to aeons? • How easily are these species able to recolonise and establish equivalent systems?

  6. Response to abstraction • Continuous (e.g. proportional, linear, non-linear) • point and diffuse discharge, stream/river systems • Discontinuous (e.g. threshold) • water table within rooting zone

  7. Vulnerability • Threats: • Potential (e.g. large scale abstraction) • Probable (e.g. climate change) • Known (e.g. invasive alien species, fires) • Conservation status • Intrinsic properties: • Directly gw dependent species/communities • Functional relationships to associated ecosystems (e.g. keystone species, key processes)

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