Javier G. P. Gamarra

Javier G. P. Gamarra
Food and Agriculture Organization of the United Nations | FAO · Forestry Division

Ph.D Forest Science / Theoretical Ecology
Open forest data. Forest estimation for climate action. Capacity development on National Forest Inventories.

About

68
Publications
41,756
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1,674
Citations
Introduction
Distributing workload between forest stock assessments, statistical conundrums in forestry, biodiversity, and epidemiology when a bit of time is still left.
Additional affiliations
April 2014 - present
Food and Agriculture Organization of the United Nations
Position
  • International Consultant Forestry Statistics
April 2012 - April 2013
Aberystwyth University
Position
  • Advanced Research Fellow in Hydrobiology
February 2010 - April 2012
Aberystwyth University
Position
  • Advanced Research Fellow in Hydrobiology

Publications

Publications (68)
Article
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The large decline in plant and animal diversity of semi-natural grasslands resulting from the introduction of modern agricultural practices in the 1940’s has been well documented and such changes are also suspected of causing the decline in the abundance and diversity of macrofungi in these habitats. We conducted repeated surveys at 48 selected gra...
Article
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The latitudinal diversity gradient (LDG) is one of the most recognized global patterns of species richness exhibited across a wide range of taxa. Numerous hypotheses have been proposed in the past two centuries to explain LDG, but rigorous tests of the drivers of LDGs have been limited by a lack of high-quality global species richness data. Here we...
Article
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National forest inventories (NFIs) are a reliable source for national forest measurements. However, they are usually not developed for linking with remotely sensed (RS) biomass information. There are increasing needs and opportunities to facilitate this link toward better global and national biomass estimation. Thus, it is important to study and un...
Technical Report
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The Paris Agreement on Climate Change rests upon a foundation of Nationally Determined Contributions (NDCs) originally submitted by Parties to the Convention in 2015, and formally adopted in November 2016 as the Agreement entered into force. Each NDC represents the national plans and pledges individual countries have made to meet the universal goal...
Article
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One of the most fundamental questions in ecology is how many species inhabit the Earth. However, due to massive logistical and financial challenges and taxonomic difficulties connected to the species concept definition, the global numbers of species, including those of important and well-studied life forms such as trees, still remain largely unknow...
Article
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For monitoring and reporting forest carbon stocks and fluxes, many countries in the tropics and subtropics rely on default values of forest aboveground biomass (AGB) from the Intergovernmental Panel on Climate Change (IPCC) Guidelines for National Greenhouse Gas (GHG) Inventories. Default IPCC forest AGB values originated from 2006, and are relativ...
Article
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Reductions in atmospheric concentrations of greenhouse gases are urgently needed to avoid the most catastrophic consequences of warming. Reducing deforestation and forest degradation presents a climate change mitigation opportunity critical to meeting Paris Agreement goals. One strategy for decreasing carbon emissions from forests is to provide dev...
Article
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Open access to global forest data, especially ground-measured (in situ) records, is critical for saving the world's forest systems. Integrated approaches to achieve sustainable data openness will involve legal assurances, shared ethics, innovative funding schemes and capacity development.
Article
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Tropical deforestation drivers are complex and can change rapidly in periods of profound societal transformation, such as those during a pandemic. Evidence suggests that the COVID-19 pandemic has spurred illegal, opportunistic forest clearing in tropical countries, threatening forest ecosystems and their resident human communities. A total of 9,583...
Technical Report
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Decisions based on data and analysis are often deemed to produce a better outcome and providing decision-makers with information is seen as an important development strategy. The adoption of the Sustainable Development Goals reinforces the importance of sciencepolicy linkages. In the forestry sector, efforts to reduce emissions from deforestation a...
Article
A major component of upgrading and improving the National Forest Monitoring System of Myanmar is the planning of a new National Forest Inventory (NFI) able to provide reliable information on the state of the forests and their changes over time for multiple purposes, including climate change and REDD+ related reporting. Planning a new NFI requires a...
Technical Report
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This report provides an update on forest reference (emission) levels (FREL/FRLs) and Reducing Emissions from Deforestation and Forest Degradation Plus (REDD+) results submitted to the United Nations Framework Convention on Climate Change (UNFCCC), and relevant developments under the Green Climate Fund concerning REDD+ results-based payments. It ill...
Article
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In this Letter, a middle initial and additional affiliation have been added for author G. J. Nabuurs; two statements have been added to the Supplementary Acknowledgements; and a citation to the French National Institute has been added to the Methods; see accompanying Author Correction for further details.
Article
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2019, The Author(s), under exclusive licence to Springer Nature Limited. In this Letter, the middle initial of author G. J. Nabuurs was omitted, and he should have been associated with an additional affiliation: ‘Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, The Netherlands’ (now added as affiliation 18...
Article
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A spatially explicit global map of tree symbioses with nitrogen-fixing bacteria and mycorrhizal fungi reveals that climate variables are the primary drivers of the distribution of different types of symbiosis.
Article
The need to provide transparent and reliable Greenhouse Gas (GHG) emission estimates is strongly emphasized in the context of international reporting under the United Nations Framework Convention on Climate Change (UNFCCC) and the Paris Agreement. Yet it is difficult to find specific guidance about what information is really needed to evaluate the...
Technical Report
Full-text available
Monografías Instituto Serranía Celtibérica nº 3 , Registro General de Propiedad Intelectual. Solicitud. Nº TE – 8 - 19
Article
The spatial distribution of biomass is key to optimize forest inventory designs to estimate forest aboveground biomass. Point process theory sets an appropriate mathematical framework to model the spatial distribution of trees, then to derive analytical expressions for the relationship between the variance of biomass in plots and the characteristic...
Article
With warming climate many species are predicted to shift their distributions toward the poles. However, climate change models developed to predict species distributions do not always incorporate interactions between them. The northerly shift of the boreal forest and associated dwarf shrub communities will be directly affected by warming. But warmin...
Preprint
Full-text available
The need to provide transparent and reliable Greenhouse Gas (GHG) emission estimates is strongly emphasized in the context of international reporting under the United Nations Framework Convention on Climate Change (UNFCCC) and the Paris Agreement. Yet it is difficult to find specific guidance about what information is really needed to evaluate the...
Technical Report
Full-text available
The objective of this report is to provide an update of the GlobAllomeTree database with relevant tree allometric models for seven Southeast Asian countries - Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, Thailand and Viet Nam. Models are obtained from both peer-reviewed scientific literature and national technical repor...
Technical Report
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The landmark Paris Agreement on climate change has created a new context for international efforts to mitigate climate change and affirmed the existing framework for reducing emissions from deforestation and forest degradation and the role of sustainable management of forests, conservation and enhancement of forest carbon stocks, known as REDD+. Wi...
Article
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Large-area forest inventories are often undertaken following a stratified random or systematic design. Yet the strata rarely correspond to the reporting areas of interest (domains) over which the country wants to report specific variables. The process is exemplified by a country aiming to use national forest inventory data to obtain average biomass...
Preprint
Full-text available
Large scale forest inventories are often undertaken following a stratified random or systematic design. Yet the strata rarely correspond to the reporting areas of interest (domains) over which the country wants to report specific variables. The process is exemplified by a country aiming to use national forest inventory data to obtain average biomas...
Article
Full-text available
In many countries, inventory data or biomass or volume equations are often incomplete or unavailable. Either taxonomic information is not accurate at the species level, or else no literature exist compiling particular allometric equations for some species. On the other hand, some species are represented by many alternative equations in the database...
Conference Paper
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The choice of biomass and volume models is one of the main sources of uncertainty in forest biomass assessment. The quality of the dataset used to develop the equations, the statistical procedures used for modelling and the accuracy in reporting the results vary greatly among the models. Recent studies highlighted that about 25% of the published eq...
Conference Paper
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Estimating tree and forest biomass is a cornerstone of forest resource assessment. In addition to its application in forest-related commerce, forest resource assessment is becoming increasingly crucial in light of continued global deforestation and climate change. The most frequently used methods for estimating forest biomass involve allometric equ...
Technical Report
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Under the support of the UN-REDD Programme, an inventory of volume and biomass tree allometric equations is being undertaken globally. This report introduces an allometric equation database developed specifically for China that complements the current database for Asian countries. The database was prepared following the tutorial given by Baldasso,...
Article
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Larval source management is a promising component of integrated malaria control and elimination. This requires development of a framework to target productive locations through process-based understanding of habitat hydrology and geomorphology. We conducted the first catchment scale study of fine resolution spatial and temporal variation in Anophel...
Article
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Local remediation measures, particularly those undertaken in historical mining areas, can often be ineffective or even deleterious because erosion and sedimentation processes operate at spatial scales beyond those typically used in point-source remediation. Based on realistic simulations of a hybrid landscape evolution model combined with stochasti...
Article
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Key Words: Science, IBERS, Fieldwork, Active Learning, Research-Based Teaching, Assessment, Student Motivation
Chapter
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Key Words: Science, IBERS, UG Year 2, Team Work, Large Group, Active Learning, Student-Led Learning
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Key Words: Science, IBERS, Research-Based Teaching, Student-Led Learning, UG Year 3, Loop of Repitition, Video Use in Lectures
Article
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In the current Higher Education climate, there is a pressing need to integrate research and teaching in the student learning experience. In order to create synergy between research and teaching activities, to the benefit of students and instructors, we provided students with the opportunity to participate in a high profile collaboration between two...
Article
Many adaptation strategies focus on improving short-term capacities to cope with environmental change, but ignore the possibility that they might inadvertently increase vulnerability to unforeseen changes in the future. To help develop more effective long-term strategies, we present a conceptual framework of adaptation. The framework emphasizes tha...
Article
1. The relationship between occupancy and spatial contagion during the spread of eruptive and invasive species demands greater study, as it could lead to improved prediction of ecosystem damage. 2. We applied a recently developed model that links occupancy and its fractal dimension to model the spatial distribution of mountain pine beetle infestati...
Chapter
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The quest to understand animate nature, its origins, current state and future course, its dynamical underpinnings and interface with the physical world, is surely the tacit aspiration of contemporary ecology. As a field of inquiry, academic ecology emerged in earnest from the descriptive realm of natural history in the late nineteenth century when...
Article
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The use of fractals in ecology is currently pervasive over many areas. However, very few studies have linked fractal properties of landscapes to generating ecological mechanisms and dynamics. In this study I show that lacunarity (a measure of the landscape texture) is a well suited ecologically scaled landscape index that can be explicitly incorpor...
Article
Rainforests biodiversity is sustained by the three-dimensional structure of their canopy which provides a wide range of physical microenvironments. Given the dynamic nature of the forest, the recognition of stable vertical layers or strata in the canopy is controversial. The spatial characterisation of potential habitats of understory species is no...
Article
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Complex combinations of historical and local-regional processes determine the assembly of ecological communities. We investigated such processes in the Hawaiian introduced avifauna, comprising 140 years of historical records of invasions and extinctions of birds. Here the particular introduction regime (i.e., colonization attempts and number of int...
Article
Nonoverlapping generations have been classically modelled as difference equations in order to account for the discrete nature of reproductive events. However, other events such as resource consumption or mortality are continuous and take place in the within-generation time. We have realistically assumed a hybrid ODE bidimensional model of resources...
Article
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Monotonic, hump-shaped and zero-correlation productivity-diversity relationships have been found to date in many ecosystems. This diversity of responses has puzzled ecologists in their search for general principles on ecosystem functioning. Some state that the scale of observation is crucial in defining this relationship. We have developed a spatia...
Article
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Resumen de Tesis Doctoral. Director: Ricard V. Solé. Centro: Universitat Politècnica de Catalunya. Universitat de Lleida. Fecha de lectura: 1 de Febrero 2002.
Article
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The possibility of chaos control in biological systems has been stimulated by recent advances in the study of heart and brain tissue dynamics. More recently, some authors have conjectured that such a method might be applied to population dynamics and even play a nontrivial evolutionary role in ecology. In this paper we explore this idea by means of...
Article
The existence of deterministic chaos has been reported to date for a small number of real ecosystems. However, advances in the quest for chaos may include the application of chaos control techniques. In this paper, we study a model system, that of vegetation–hares–lynx interactions, in order to show the effects that control may exert on the structu...
Article
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Nicholson who already asked the question of how population dynamics would operate in a non-homogeneous, instead of well mixed environment (Nicholson, 1933). In this sense, Nicholson's prediction of global persistence of locally weakly dependent populations received a rst conrmation. These questions were later developped by Levins using simple model...
Article
One of the most popular data sets in ecology, that of lynx fur returns, is analysed in order to look for evidence for a bifurcation process. This bifurcation seems to be present from the observation of sudden shifts in the amplitude of oscillations of the lynx time series. Schaffer first proposed the possibility for such a bifurcation in 1985, and...
Article
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The concept of chaos in ecological populations is widely known for non-overlapping generations since the early theoretical works of May [19