Generic GDE concepts for the TMG

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Generic GDE concepts for the TMG
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Regional to landscape scale systems
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Landscape to habitat scale systems
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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
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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?

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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

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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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