hanski’s incidence function model for urban biodiversity planning
DESCRIPTION
Hanski’s incidence function model for urban biodiversity planning. Laura Graham, ESRC funded PhD candidate. Supervisors: Prof. Roy Haines-Young Dr. Richard Field. Background. Importance of urban ecosystems to both human well-being and biodiversity prevalent in conservation policy - PowerPoint PPT PresentationTRANSCRIPT
Hanski’s incidence function model for urban biodiversity
planning
Laura Graham, ESRC funded PhD candidate
Supervisors: Prof. Roy Haines-Young Dr. Richard Field
Background
Importance of urban ecosystems to both human well-being and biodiversity prevalent in conservation policy
Lawton Report implies a need for conservation planning at a landscape level
Does not seem to have formed part of local authority policy
Research Aim
To investigate the applicability of the IFM to urban biodiversity planning at landscape scale
by testing suitability of available data through sensitivity analysis
To use the IFM to explore policy questions of both local and national relevance
Spatially realistic metapopulation model
Low data requirements
Urban landscapes are fragmented
Incidence function model (IFM)
Incidence function model (IFM)
Time (t) = 0
Incidence function model (IFM)
Time (t) = 0 t = 1
Incidence function model (IFM)
Time (t) = 0
t = 2
t = 1
Incidence function model (IFM)
Time (t) = 0
t = 2
t = 1
t = 3
Incidence function model (IFM)
Time (t) = 0
t = 2
t = 1
t = 3
Implications of data quality
Mis-estimated patch areas
Habitat patches not identified
False absences in species datasetMoilanen, 2002
Study Site and Landscape Data
Data from Nottinghamshire Birdwatchers
Map shows surveyed grid squares (1998-2011)
Data from 1998-2009 grouped into 3 survey windows
Species Data
Patch Occupancy
1. Survey data
2. Interpolated data (kriging)
3. Random at surveyed %
4. Random at interpolated %
1.
4.
2.
3.
Blackbird (Turdus merula)
Time
Patc
hes O
ccup
ied
← Effects of occupancy level →
← Effects of spatial structure →
Photo credit: Oystercatcher on
flickr
Corn Bunting (Miliaria calandra)
Time
Patc
hes O
ccup
ied
← Effects of occupancy level →
← Effects of spatial structure →
Photo credit: Steve Riall on
flickr
Marsh Tit (Poecile palustris)
Time
Patc
hes O
ccup
ied
← Effects of occupancy level →
← Effects of spatial structure →
Photo credit: Steffen Hannert
Parameterise on subset of survey data
Parameterise on subsets comprising grid squares surveyed in both 1st and 2nd survey window
Run model for each set of parameters
Results of subsetting
Patc
hes O
ccup
ied
Time
Conservation policy implications
If IFM has potential to be used to for urban biodiversity planning:
Need for intensive monitoring and surveying
Need for more joined up and centralised databases
Compare relative effects of varying management scenarios