Conservation of the Ethiopian church forests: Threats, opportunities and implications for their management

Raf Aerts; Koen Van Overtveld; Eva November; Alemayehu Wassie; Abrham Abiyu; Sebsebe Demissew; Desalegn D Daye; Kidane Giday; Mitiku Haile; Sarah TewoldeBerhan; Demel Teketay; Zewge Teklehaimanot; Pierre Binggeli; Jozef Deckers; Ib Friis; Georg Gratzer; Martin Hermy; Moïra Heyn; Olivier Honnay; Maxim Paris; Frank J Sterck; Bart Muys; Frans Bongers; John R Healey

doi:10.1016/j.scitotenv.2016.02.034

Conservation of the Ethiopian church forests: Threats, opportunities and implications for their management

Sci Total Environ. 2016 May 1:551-552:404-14. doi: 10.1016/j.scitotenv.2016.02.034. Epub 2016 Feb 13.

Authors

Raf Aerts¹, Koen Van Overtveld², Eva November³, Alemayehu Wassie⁴, Abrham Abiyu⁵, Sebsebe Demissew⁶, Desalegn D Daye⁷, Kidane Giday⁸, Mitiku Haile⁹, Sarah TewoldeBerhan¹⁰, Demel Teketay¹¹, Zewge Teklehaimanot¹², Pierre Binggeli¹³, Jozef Deckers¹⁴, Ib Friis¹⁵, Georg Gratzer¹⁶, Martin Hermy¹⁷, Moïra Heyn¹⁸, Olivier Honnay¹⁹, Maxim Paris²⁰, Frank J Sterck²¹, Bart Muys²², Frans Bongers²³, John R Healey²⁴

Affiliations

¹ Division Forest, Nature and Landscape, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium; College of Dryland Agriculture and Natural Resources, Mekelle University, P.O.·Box 231, Mekelle, Ethiopia. Electronic address: [email protected].
² Division Soil and Water Management, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium. Electronic address: [email protected].
³ College of Dryland Agriculture and Natural Resources, Mekelle University, P.O.·Box 231, Mekelle, Ethiopia; Division Soil and Water Management, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium. Electronic address: [email protected].
⁴ Forest Ecology and Forest Management Group, Wageningen University and Research Centre, P.O. Box 47, NL-6700 AA Wageningen, The Netherlands; College of Agriculture and Environmental Sciences, Bahir Dar University, P.O. Box 5501, Bahir Dar, Ethiopia. Electronic address: [email protected].
⁵ Institute of Forest Ecology, University of Natural Resources and Life Sciences, Peter Jordanstraße 82, A-1190, Vienna, Austria; Amhara Agricultural Research Institute, P.O. Box 527, Bahir Dar, Ethiopia. Electronic address: [email protected].
⁶ National Herbarium, Department of Plant Biology and Biodiversity Management, Addis Ababa University, P.O. Box 3434, Addis Ababa, Ethiopia.. Electronic address: [email protected].
⁷ School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK; Ethiopian Wildlife and Natural History Society, P.O·Box 13303, Addis Ababa, Ethiopia. Electronic address: [email protected].
⁸ Division Forest, Nature and Landscape, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium; College of Dryland Agriculture and Natural Resources, Mekelle University, P.O.·Box 231, Mekelle, Ethiopia. Electronic address: [email protected].
⁹ College of Dryland Agriculture and Natural Resources, Mekelle University, P.O.·Box 231, Mekelle, Ethiopia. Electronic address: [email protected].
¹⁰ College of Dryland Agriculture and Natural Resources, Mekelle University, P.O.·Box 231, Mekelle, Ethiopia. Electronic address: [email protected].
¹¹ Department of Crop Science and Production, Botswana University of Agriculture and Natural Resources, Private Bag 0027, Gaborone, Botswana. Electronic address: [email protected].
¹² School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK. Electronic address: [email protected].
¹³ School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK. Electronic address: [email protected].
¹⁴ Division Soil and Water Management, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium. Electronic address: [email protected].
¹⁵ Natural History Museum of Denmark, University of Copenhagen, Sølvgade 83, Opgang S, DK-1307 Copenhagen K, Denmark. Electronic address: [email protected].
¹⁶ Institute of Forest Ecology, University of Natural Resources and Life Sciences, Peter Jordanstraße 82, A-1190, Vienna, Austria. Electronic address: [email protected].
¹⁷ Division Forest, Nature and Landscape, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium. Electronic address: [email protected].
¹⁸ Division Forest, Nature and Landscape, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium. Electronic address: [email protected].
¹⁹ Ecology, Evolution and Biodiversity Conservation Section, University of Leuven, Kasteelpark Arenberg 31-2435, BE-3001 Leuven, Belgium. Electronic address: [email protected].
²⁰ Faculty of Engineering Technology, University of Leuven, Kleinhoefstraat 4, BE-2440 Geel, Belgium.
²¹ Forest Ecology and Forest Management Group, Wageningen University and Research Centre, P.O. Box 47, NL-6700 AA Wageningen, The Netherlands. Electronic address: [email protected].
²² Division Forest, Nature and Landscape, University of Leuven, Celestijnenlaan 200E-2411, BE-3001 Leuven, Belgium. Electronic address: [email protected].
²³ Forest Ecology and Forest Management Group, Wageningen University and Research Centre, P.O. Box 47, NL-6700 AA Wageningen, The Netherlands. Electronic address: [email protected].
²⁴ School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK. Electronic address: [email protected].

PMID: 26881731
DOI: 10.1016/j.scitotenv.2016.02.034

Abstract

In the central and northern highlands of Ethiopia, native forest and forest biodiversity is almost confined to sacred groves associated with churches. Local communities rely on these 'church forests' for essential ecosystem services including shade and fresh water but little is known about their region-wide distribution and conservation value. We (1) performed the first large-scale spatially-explicit assessment of church forests, combining remote-sensing and field data, to assess the number of forests, their size, shape, isolation and woody plant species composition, (2) determined their plant communities and related these to environmental variables and potential natural vegetation, (3) identified the main challenges to biodiversity conservation in view of plant population dynamics and anthropogenic disturbances, and (4) present guidelines for management and policy. The 394 forests identified in satellite images were on average ~2ha in size and generally separated by ~2km from the nearest neighboring forest. Shape complexity, not size, decreased from the northern to the central highlands. Overall, 148 indigenous tree, shrub and liana species were recorded across the 78 surveyed forests. Patch α-diversity increased with mean annual precipitation, but typically only 25 woody species occurred per patch. The combined results showed that >50% of tree species present in tropical northeast Africa were still present in the 78 studied church forests, even though individual forests were small and relatively species-poor. Tree species composition of church forests varied with elevation and precipitation, and resembled the potential natural vegetation. With a wide distribution over the landscape, these church forests have high conservation value. However, long-term conservation of biodiversity of individual patches and evolutionary potential of species may be threatened by isolation, small sizes of tree species populations and disturbance, especially when considering climate change. Forest management interventions are essential and should be supported by environmental education and other forms of public engagement.

Keywords: Africa; Forest fragments; Landscape ecology; Relic vegetation; Remote sensing; Sacred groves.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biodiversity
Climate Change
Conservation of Natural Resources / methods*
Äthiopien
Forests*