Salit Kark The Biodiversity Research Group Department of Evolution, Systematics and Ecology

1. Conservation Biology (Ecology) Lecture 5 November 2009 Salit Kark The Biodiversity Research Group Department of Evolution, Systematics and Ecology The Silberman Institute of Life Sciences The Hebrew University of Jerusalem Dr. Salit Kark. The Hebrew University of Jerusalem

2. Conservation of peripheral populations: Species ranges - concepts: • periphery vs. core - geographical • marginvs. center - ecological • edgevs. interior - geographical • sinkvs. source - metapopulation dynamics • outlandvs. homeland - metapopulation dynamics • islandvs. mainland - geographical or ecological Dr. Salit Kark. The Hebrew University of Jerusalem

3. Peripheral populations - spatial scale: A Periphery? B Periphery? C Periphery? Dr. Salit Kark. The Hebrew University of Jerusalem

4. Conservation of peripheral populations: Predictions (truisms?): Small Fragmented Isolated Higher disturbance More variable Higher stress Genetic diversity and demography patterns Dr. Salit Kark. The Hebrew University of Jerusalem

5. Decrease Genetic diversity Distance from range periphery Fisher hypothesis - peripheral populations sustain higher levels of genetic diversity, undergoing fluctuating selection in spatially heterogeneous and unpredictable environments while core populations experience stabilizing selection (Fisher ’30) Trends from periphery to core across a species range Increase Genetic diversity Distance from range periphery Carson hypothesis - core populations maintain higher genetic diversity, undergoing balancing selection, while peripheral populations - small, fragmented and isolated have low diversity. Marginal conditions permit survival of a limited number of genotypes only (Carson ‘59, Lewontin ‘74) Mayr hypothesis Dr. Salit Kark. The Hebrew University of Jerusalem

6. Diversity in chukar partridges across the distribution gradient in Israel Photo: Mosaic from Madaba Jordan, 6th century (Byzantine period) Salit Kark Dr. Salit Kark. The Hebrew University of Jerusalem

7. Mean annual rainfall in study region Ecotone Dr. Salit Kark. The Hebrew University of Jerusalem

8. Genetic diversity in chukar partridges across the range Dr. Salit Kark. The Hebrew University of Jerusalem

9. Percentage of plant species belonging to major chorotypes across chukar sampling sites in Israel from south to north* *Data from A. Danin North South Dr. Salit Kark. The Hebrew University of Jerusalem

10. Natural vs. agri Dr. Salit Kark. The Hebrew University of Jerusalem

11. Dr. Salit Kark. The Hebrew University of Jerusalem

12. Range contraction Dr. Salit Kark. The Hebrew University of Jerusalem From: Rob Channell web page (http://www.fhsu.edu/biology/rchannell/)

13. Range contraction Channell and Lomolino 2000 • Mapped 245 species from various groups • Divided range to two parts: core and periphery Dr. Salit Kark. The Hebrew University of Jerusalem

14. Locating the historical range core using GIS core Dr. Salit Kark. The Hebrew University of Jerusalem

15. A dichotomous approach: Equal area Dr. Salit Kark. The Hebrew University of Jerusalem

16. A dichotomous approach: Equal area Equal distance Dr. Salit Kark. The Hebrew University of Jerusalem

17. Giant Panda historical and current range (from web page of AMNH, map by Joyce Penola) Dr. Salit Kark. The Hebrew University of Jerusalem

18. From: IRF web page Dr. Salit Kark. The Hebrew University of Jerusalem

19. Fisher historical and current range Dr. Salit Kark. The Hebrew University of Jerusalem

20. Range contraction Channell and Lomolino 2000 • Found that 98% maintained populations in part of the periphery • 68% maintained higher than expected in periphery • 91 species occurred only in periphery (5 only in core) • Relate their findings to human activity • Different patterns in Africa Dr. Salit Kark. The Hebrew University of Jerusalem

21. Adding an intermediate area Equal area Equal distance Dr. Salit Kark. The Hebrew University of Jerusalem

22. From a dichotomous to a more continuous approach (equal area) 2 belts 3 belts 10 belts Dr. Salit Kark. The Hebrew University of Jerusalem

23. BioScience 2004 54:123-137 • Studied 43 North American carnivores and ungulates • 17 contracted over 20% of original range • Related to human influence and history, as predicted • Differs among regions • Rapid change in distributions over a century Dr. Salit Kark. The Hebrew University of Jerusalem

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25. Dr. Salit Kark. The Hebrew University of Jerusalem