Chris J Kettle

Chris J Kettle
Bioversity International · Forest Genetic Resources Programme

PhD Tropical Ecology and Conservation Genetics University of Edinburgh
Global lead on Tree Biodiversity for Resilient landscapes

About

139
Publications
26,706
Reads
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1,423
Citations
Citations since 2016
59 Research Items
916 Citations
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Introduction
I am Program Leader in Tree Biodiversity for Resilient landscapes at the Alliance of Bioversity International and CIAT, (CGIAR) and retain a position as Group Leader in Applied Molecular Ecology and Conservation Genetics, within the Department of Environmental System Science at the ETH Zurich, Switzerland. My main research focus is on understanding tropical tree reproductive ecology and applying molecular Ecology to conservation, restoration and the resilience of forest landscapes.
Additional affiliations
January 2011 - present
ETH Zurich
January 2007 - present
ETH Zurich
January 2006 - March 2009
University of Aberdeen
Position
  • PostDoc Position
Education
October 2001 - June 2005
The University of Edinburgh
Field of study
  • Conservation Genetics
October 1997 - June 2001
The University of Edinburgh
Field of study
  • Ecology

Publications

Publications (139)
Article
Full-text available
p>In the original publication of the article, under the case study “Case study 3: Participatory guarantee system to stimulate agroecological transition in Cuba”, the reference “Fernández León 2016” should read “Fernández and León 2016”. Further, the correct reference should read as below, Díaz Fernández I, León DE (2016) Gestión Empresarial y Géner...
Article
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Governments are updating national strategies to meet global goals on biodiversity, climate change and food systems proposed in the Convention on Biological Diversity post-2020 framework and agreed at the United Nation’s Climate Change Conference (COP26) and Food Systems Summit (UNFSS). This represents a unique and crucial opportunity to integrate a...
Article
Full-text available
Climate change and other anthropogenic threats are increasingly imperilling the diverse biomes of Central Africa, which are globally important for biodiversity, carbon storage and people's livelihoods. The objectives of this paper were to: (i) map the vulnerability of 100 socio-ecologically important priority tree species in Central Africa to clima...
Article
Understanding the impact of multiple anthropogenic threats on tree species is urgently needed for estimating population decline and enabling coordinated and efficient conservation actions. We applied a spatially explicit framework to assess the vulnerability of three highly valuable Asian rosewood species (Dalbergia cochinchinensis, D. cultrata, D....
Article
Full-text available
At the start of the UN Decade of Ecosystem Restoration (2021 – 2030), the restoration of degraded ecosystems is more than ever a global priority. Tree planting will make up a large share of the ambitious restoration commitments made by countries around the world, but careful planning is needed to select species and seed sources that are suitably ad...
Article
At the start of the UN Decade of Ecosystem Restoration (2021–2030), the restoration of degraded ecosystems is more than ever a global priority. Tree planting will make up a large share of the ambitious restoration commitments made by countries around the world, but careful planning is needed to select species and seed sources that are suitably adap...
Article
Full-text available
Tree diversity in Asia's tropical and subtropical forests is central to nature-based solutions. Species vulnerability to multiple threats, which affects the provision of ecosystem services, is poorly understood. We conducted a region-wide, spatially explicit vulnerability assessment (including overexploitation, fire, overgrazing, habitat conversion...
Book
Full-text available
The work of the CGIAR Research Program on Forests, Trees and Agroforestry (FTA) on tree seed systems — the authors’ shorthand for the means through which growers obtain access to tree-planting materials, either seeds or seedlings — has sought to address significant constraints in the diversity and genetic quality of the tree seeds and seedlings tha...
Book
Full-text available
Forests and trees are critical for the survival of life on earth. They conserve a tremendous biodiversity and fulfill essential ecosystem services such as climate regulation, cycling of nutrients and water. They contribute to food and nutrition security, are a major source of raw materials and offer countless livelihood opportunities. However, fore...
Article
Full-text available
Livestock are critical for incomes, livelihoods, nutrition and ecosystems management throughout the global South. Livestock production and the consumption of livestock-based foods such as meat, cheese, and milk is, however, under global scrutiny for its contribution to global warming, deforestation, biodiversity loss, water use, pollution, and land...
Article
Full-text available
High-quality, suitably adapted tree seed at volume is a key component for the implementation and long-term success of forest landscape restoration (FLR). We analysed the tree seed systems in four Asian countries—the Philippines, Indonesia, Malaysia and India—which have committed to restore in total over 47.5 million hectares of degraded lands by 20...
Chapter
Full-text available
Latin America boasts an enormous diversity of nutritionally important and potentially economically valuable fruit trees. The majority have limited national and regional markets, with only a few traded internationally. This chapter explores why native fruit trees remain neglected and underutilized species (NUS) despite their potential to diversify d...
Article
Full-text available
Achieving multi-million-hectare commitments from countries around the world to restore degraded lands in resilient and sustainable ways requires, among other things, huge volumes of tree planting material. Seed systems encompassing all forest reproductive material (e.g., seeds, cuttings, stakes, and wildings), are key to ensuring that sufficient pl...
Article
Full-text available
To maximize trees restoration potential, it is crucial to know where and how. In this study led by Rens Brouwer, we explored the planting performance and productivity of a socio-environmentally highly valuable species from the Amazon, the Brazil nut tree, and compared its planting success across management practices, degraded areas, agroforestry sy...
Article
Full-text available
1. Forest landscape restoration (FLR) has gained momentum globally and guidance is needed to identify those species, sites and planting methods that increase restoration success. Incorporating native Non-Timber Forest Product (NTFP) species in FLR approaches provides an opportunity to simultaneously deliver ecological and economic benefits. The Bra...
Article
Full-text available
Agroforestry systems with a range of native and often neglected and underutilized tree species (NUS) are increasingly recognized for their potential role in restoration, simultaneously providing ecological and livelihood benefits. Successful adoption of these systems requires knowledge about beneficial species, system-level potential profitability,...
Article
Tree-based forest landscape restoration interventions require knowledge on the suitability and origin of seed sources and planting material. A common recommendation is to select locally sourced material based on the assumption that it is well adapted to local environmental conditions and to avoid introduction of maladapted genes. However, faced wit...
Thesis
Full-text available
• Non-timber forest products offer a critical opportunity for supporting sustainable development of rural communities and conservation of natural ecosystems. The Brazil nut (Bertholletia excelsa) is arguably the most prominent NFTP from the Neo-tropics, as a globallytraded product from a hyperdominant carbon-rich tree and cornerstone species for ra...
Article
Full-text available
The Brazil nut is a highly valuable non-timber forest product from a wild, hyper-dominant, emergent tree species that is increasingly vulnerable and exposed to habitat degradation. We provide evidence for how Brazil nut genetic resources are negatively affected by forest degradation and discuss the consequences of this for reproductive success. To...
Article
Full-text available
Brazil nuts are an economically important non-timber forest product throughout the Amazon Basin, but the forests in which they grow are under threat of severe degradation by logging, road building, agricultural expansion, and forest fires. As a result, many Brazil nut trees grow within a mosaic of young secondary forest, primary forest remnants and...
Article
Full-text available
The genetic diversity, quality and suitability of seeds and planting stock is crucial for the short and long-term resilience of restored forest landscapes. However, these genetic aspects are widely neglected during both planning and implementation of restoration. Decisions on seed sourcing during implementation of forest landscape restoration (FLR)...
Article
Full-text available
Forest landscape restoration (FLR) is globally important to mitigate a wide range of social and environmental problems driven by landscape degradation and deforestation. Despite widespread recognition of the urgent need to restore biodiversity and ecological functioning across many forest landscapes, there is an apparent mismatch between political...
Article
https://www.agrilinks.org/post/lets-bee-real-forest-management-critical-pollination-services
Article
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1. The global food system is causing large-scale environmental degradation and is a major contributor to climate change. Its low diversity and failure to produce enough fruits and vegetables is contributing to a global health crisis. 2. The extraordinary diversity of tropical tree species is increasingly recognized to be vital to planetary health...
Article
Full-text available
FAO. 2020. Restoring the Earth – The next decade. EDITORIAL. Over the last 20 years, forest and landscape restoration (FLR) has developed as an approach to increase the ecological integrity and functioning of degraded forests and landscapes while simultaneously improving human well-being and livelihoods. The impetus for FLR stems from the vast ext...
Article
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In this article we highlight the challenges involved in delivering seeds at a large scale and the policy initiatives that could be put in place to ensure functional, well-tracked tree-seed delivery. We discuss the need to link the conservation of tree genetic resources (TGR) with their sustainable use and livelihoods in FLR and provide case studies...
Article
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Central Asia is an important center of diversity for common walnut (Juglans regia L.). We characterized the genetic diversity of 21 wild and cultivated populations across Kyrgyzstan, Tajikistan, and Uzbekistan. A complete threat assessment was performed evaluating the short-term threats from overexploitation, overgrazing, landslides, and fragmentat...
Article
Full-text available
Lodoicea maldivica (coco de mer) is a long-lived dioecious palm in which male and female plants are visually indistinguishable when immature, only becoming sexually dimorphic as adults, which in natural forest can take as much as 50 years. Most adult populations in the Seychelles exhibit biased sex ratios, but it is unknown whether this is due to d...
Article
Where conspecific seedlings occur at high densities, density dependent processes tend to depress their performance and survival relative to co‐occurring heterospecifics. We extend this observation to within‐species genetic diversity and relatedness. We posit that seedling growth and survival increase where there is higher genetic diversity, and low...
Article
Climate change will affect ecological factors that influence species distribution patterns at different spatial and temporal scales. We applied MaxEnt to predict how climate change will influence the distribution of ecologically and economically important tree species Dalbergia cultrata Graham ex Benth. D. cultrata is distributed across the tropica...
Presentation
ABSTRACT The Critically endangered Dipterocarpus ochraceus is one of the six endemic dipterocarps in Sabah. Based on past collections data, the species has lost 68% of its original habitat due to human activities such as land development and encroachment, as well as natural disasters. This has led to extreme rarity with only three isolated remnan...
Poster
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Thousands of ecologically and socio-economically important tree species in Asia are threatened, yet very little information is available on their historical and current distribution, patterns of genetic diversity, intensity of threats across their distribution ranges, or availability of seed sources to support restoration. Effective conservation st...
Article
Full-text available
Conspecific distance and density-dependence is a key driver of tree diversity in natural forests, but the extent to which this process may influence ecosystem service provision is largely unknown. Drawing on a dataset of >135,000 trees from the Peruvian Amazon, we assessed its manifestation in biomass accumulation and seed production of Brazil nut...
Article
Full-text available
Documenting the scale and intensity of fine-scale spatial genetic structure (FSGS), and the processes that shape it, is relevant to the sustainable management of genetic resources in timber tree species, particularly where logging or fragmentation might disrupt gene flow. In this study we assessed patterns of FSGS in three species of Dipterocarpace...
Data
Topographic maps of the four research plots including the coordinates of sampled individuals (S1A–S1D Fig). (DOCX)
Data
Microsatellite genotype data and spatial coordinates for all trees sampled from DVCA, together with P. tomentella data from SFR [4], S. leprosula from PFR [14], and S. parvifolia from LHNP [18]. (XLSX)
Data
Demographic Elevation Model (DEM) of the SFR 50 ha plot. Requires opening as a raster file, using the WGS84 coordinate system, UTM zone 50. (TIF)
Data
Primer details for all loci for the three dipterocarp species sampled at DVMA, together with P. tomentella data from SFR [4], S. leprosula from PFR [14], and S. parvifolia from LHNP [18]. (DOCX)
Data
Sampling of Parashorea tomentella from the Sepilok Forest Reserve (SFR). (DOCX)
Article
Full-text available
The fine-scale spatial genetic structure (FSGS) of plant populations is strongly influenced by patterns of seed dispersal. An extreme case of limited dispersal is found in the charismatic yet endangered palm Lodoicea maldivica, which produces large fruits (up to 20 kg) dispersed only by gravity. To investigate patterns of seed dispersal and FSGS in...
Article
Full-text available
Habitat degradation can reduce or even prevent the reproduction of previously abundant plant species. To develop appropriate management strategies, we need to understand the reasons for reduced recruitment in degraded ecosystems. The dioecious coco de mer palm (Lodoicea maldivica) produces by far the largest seeds of any plant. It is a keystone spe...
Article
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Despite the importance of seed dispersal for survival of plant species in fragmented landscapes, data on seed dispersal at landscape scales remain sparse. Effective seed dispersal among fragments determines recolonization and plant species persistence in such landscapes. We present the first large-scale (216-km2) direct estimates of realized seed d...
Article
Background: Logging and habitat fragmentation of tropical rain forests may disrupt patterns of gene flow and genetic diversity. Consequently, inbreeding in tree populations may reduce fitness and increase extinction risks, especially among species that are predominantly outcrossing, dependent on biotic pollination and/or display limited seed disper...
Article
Full-text available
• Premise of the study: The evolutionarily and ecologically distinct coco de mer palm Lodoicea maldivica (Arecaceae) is endemic to two islands in the Seychelles. Before colonization of the islands by man, the endangered palm formed large monodominant stands, but its natural range is now restricted to four main populations and several patches of iso...
Article
Full-text available
We measured the terminal velocity of helicopter-like fruit from the Dipterocarpaceae family and present a model predicting the terminal velocities for all dipterocarp species in the Malesiana region. A ballistic model of seed dispersal using the observed terminal velocities predicted dispersal distances of 17–77 m under normal atmospheric condition...
Article
Full-text available
Seed dispersal governs the distribution of plant propagules in the landscape and hence forms the template on which density-dependent processes act. Dispersal is therefore a vital component of many species coexistence and forest dynamics models and is of applied value in understanding forest regeneration. Research on the processes that facilitate fo...
Data
Data S1. Generating dispersal kernels and calculation of approximate P-values
Data
Table S1. Parameter estimates from the bootstrapped LMM model fitting IWL, maximum wind speed and their interaction to log-transformed fruit dispersal distance using the “new species” approach for unidentified dipterocarps.