Landscape heterogeneity
13 important questions on Landscape heterogeneity
What is the difference between gradients vs mosaics?
no boundaries
no corridors
no patches
Mosaics: where there are distinct boundaries
How much have human interferences altered the natural heterogeneity?
What are the mechanisms of patch interactions?
2. Atmospheric interactions
3. Movements of plants and animals
4. Disturbance spread
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What is a riparian community?
What ways do topographic and land water interact with patches?
influence of landscape pattern
properties of recipient ecosystems (riparian community)
How do atmospheric transfers interact with patches?
Transfer of gases (source, sink region)
dust transfer
human impacts:
acid rain
ammonia from fertilised fields and stockyards
dust deposition from agricultural lands
altered energy exchange
How do movements form plants and animals affect patches?
salmon carry marine nutrients to streams
people transfer nutrients to cities and fields
How do disturbance spreads affect patches?
both fires and pests and pathogens spread less in small patches, but at higher frequencies
What is the largest cause of changes in landscape heterogeneity ?
both through intensification and extensification
What examples of land use conversion do you know?
reforestation in temperate zone
conversion of savannahs into agriculture
Urbanisation will continue
What is a consequence of coverting land use to agriculture?
What examples of land use modification have you learned?
expansion of marine fisheries
What are the main landuses which experience intensification?
Aquaculture
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