geog 596a identifying potential dispersal corridors for the common chimpanzee (pan troglodytes) in...

GEOG 596A

Identifying Potential Dispersal Corridors for the Common Chimpanzee (Pan

troglodytes)in

Hoima District, Uganda

Marta Jarzyna

Presentation Overview

• Common Chimpanzee• Study Area• Objectives• Data and Methods

- Field Data Collection- Modeling and Analysis

• Anticipated Results• Timeline

Common chimpanzee – Pan troglodytes

• Closest living relatives to modern human being

• Found in tropical forests of Western and Central Africa (21 countries)

• IUCN Conservation Status: Endangered

Common Chimpanzee Study Area Objectives Data&Methods Anticipated Results Timeline

Photo: M. Jarzyna

Study Area - Uganda



Study Area - Hoima

Main objective: Establish a potential dispersal corridor for the common chimpanzee (P. troglodytes) between Bugoma and Budongo

In detail:• Evaluate chimp density and distribution in Hoima• Conduct landscape analysis• Propose dispersal corridor route


Objectives

• Field Data Collection (Completed for GEOG 596C)- Mammal Surveys- Nest Census

• Modeling and Analysis- Species Distribution Model- Landscape Analysis- Least-Cost Path Analysis


Data and Methods


Field Data Collection – Monitoring Locations

• Itohya Forest

• Kyampuro Forest

• Birungu Forest


Field Data Collection – Monitoring LocationsItohya Kyampuro

Birungu

Photo: M. Jarzyna

Photo: M. Jarzyna

Photo: M. Jarzyna

• Distance Sampling • Line transects• Perpendicular distance to observed objects of interests


Field Data Collection – Survey Method

Photo: M. Jarzyna

• Conducted in October 2009 through January 2010• Distance sampling• Conducted in the morning• Approximately 3 km of transects

should be sampled• Data collected:

- Mammal species- Distance of the animal/group to the observer- Height of the animal/group- Number of animals in group

• Statistical analysis using DISTANCE


Field Data Collection – Mammal Survey

Photo: M. Jarzyna

• Conducted in October 2009 through January 2010• One chimpanzee >4 years old builds one nest a night• Distance sampling• Three main methods:

- Standing Crop Count- Marked Nest Count- Encounter Rate


Field Data Collection – Nest Census

Photo: M. Jarzyna


Field Data Collection – Nest Census


Field Data Collection – DISTANCE

• Allows for design and analysis of distance sampling surveys of wildlife populations

• Calculates the density and abundance of detected objects • Probability of detecting an object decreases with increasing

distance from the observer• Statistical tools to estimate the drop-off in detection

probability


Field Data Collection – DISTANCE

ID Analysis ConditionDensity

[individual/km2]

1 Observation = ‘All Mammals’ 170.4

2 Observation = ‘Black-and-White Colobus’

110.0

3 Observation = ‘Mangabey’ 22.9

4 Observation = ‘Red-tailed Monkey’ 95.9

5 Observation = ‘Baboon’ 22.9

B

P19% P2

13%

P319%

P46%

T12%

T24%

T31%

T44%

T517%

T61%

T72%

T81%

T921%

• Species Distribution Model – ZONATION- To establish distribution of the chimpanzee in Hoima District

• Landscape Analysis – FRAGSTATS- To establish extent and fragmentation of the focal habitat

• Least-Cost Path Analysis – ArcGIS- To establish potential dispersal corridors


Modeling and Analysis

• Conservation planning software• When field monitoring not feasible

- time - labor

• Approximate distribution of the chimpanzee• Landscapes categorization - accordingly to the value for the chimpanzee


Species Distribution Model - ZONATION

Zonation 2002

• Spatial pattern analysis program• Patch level• Spatial configuration - patch size distribution and density,

patch shape complexity, edge metrics, core area, isolation/proximity, connectivity, etc.


Landscape Analysis - FRAGSTATS

Area [ha] Perimeter [m]

Perimeter-Area Ratio [-]

Core Area [ha] Proximity Index [-]

Sum 112,151.4 5,442,720 N/A 100,762.4 N/A

Average 843.2 40,923 291.2 757.6 15,990.1

Median 8.73 1920 237.5 4.5 72

Maximum 49,541.6 1,829,100 1333.3 46,904.4 137,616.5

Minimum 0.09 120 25.3 0 0


Least Cost-Path Analysis - ArcGIS

• Dispersal suitability layer created based on the landscape metrics values

• Cost associated with crossing the patches

ArcGIS 2010


Anticipated Results

• Data modeling and analysis (by July 15)

- DISTANCE – density of the chimpanzee population- ZONATION – species distribution- FRAGSTATS – landscape analysis - ArcGIS – least-cost path analysis

• Compiling results (by July 31)

• Discussion of the results (by August 15)

• Final edits to the report/paper (by September 15)


Next Steps/Timeline

• Dr. Doug Miller• Dr. Joe Bishop• Dr. Bettina Grieser Johns• Chimpanzee Sanctuary and Wildlife Conservation Trust• Wildlife Conservation Society Uganda• WWF Uganda

Acknowledgements

Questions?

Photo: M. Jarzyna

Photo: M. Jarzyna

geog 596a identifying potential dispersal corridors for the common chimpanzee (pan troglodytes) in...

Documents

mammal species distance

increasing distance

distance samplingconducted

groupstatistical analysis

chimp density

animalgroup number

standing crop count

central africa