Landscape analysis

15 important questions on Landscape analysis

What are landscape characteristics?

- Complexity
- Types of habitats, amounts, patch size
- Degree of isolation/ framentation

What are species charasteristics?

- Dispersal/colonization ability (body size)
- Foraging behaviour and range
- Feed and specialization

What is the importance of habitat configuration?

- Spatial coherence vs. fragmentation
- How does a species 'experience' landscape, is movement and dispersal possible?
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What can he helpful in analysis of spatial coherence?

Representing landscape as a graph

What is a graph?

A collection of nodes and edges, the edges connect the nodes

What is a spanning tree?

A path (without cycles) that includes every node

What is a minimum spanning tree?

The spanning tree with the shortest length

What is the special coherence?

Reflects the size of the largest connected habitat area that can support a population

What are the 3 steps of spatial coherence/connectivty?

- Minimum spanning tree
- Largest sub-graph per dispersal distance
- Intergrate for all dispersal distances

What are additional concerns with spatial coherence?

- Probability of dispersal
- Size and quality of habitats
- Interactions with hostile matrix
- Typical dispersal ranges of spp

What is pes suprestion potential?

- The role of the green-blue network of semi-natural non-crop habitats
- Natural enemies (insects) for pests by predation or parasitism
- Reduce damage to crops

What are the dangers with potatoes, suger beet and wheat?

- Aphids and thrips

What are the dangers with cabbage?

- Butterflies, moths and snails

What are fine elements?

-Smaller linear elements (width >3,5m)
- Field margins, flower strips
- Serve for feeding
- Active movement only (0-50 or 75m)

What are the uncertainties of pest suppresion potential?

- Species specific dispersal ranges
- From potential to actual suppresion
- Mixture of expert and scientific knowledge

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