Daniel Barthélémy

Daniel Barthélémy
Cirad - La recherche agronomique pour le développement | CIRAD · Département Scientifique Systèmes Biologiques (BIOS)

PhD

About

143
Publications
45,370
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,433
Citations
Additional affiliations
April 1993 - October 2010
French National Institute for Agriculture, Food, and Environment (INRAE)
Position
  • Senior Researcher

Publications

Publications (143)
Article
Full-text available
The diversification of ecological roles and related adaptations in closely related species within a lineage is one of the most important processes linking plant evolution and ecology. Plant architecture offers a robust framework to study these processes as it can highlight how plant structure influences plant diversification and ecological strategi...
Article
Full-text available
Understanding the distribution of traits across the angiosperm phylogeny helps map the nested hierarchy of features that characterize key nodes. Finding that Amborella is sister to the rest of the angiosperms has raised the question of whether it shares certain key functional trait characteristics, and plastic responses apparently widespread within...
Article
Pl@ntNet is an innovative participatory sensing platform relying on image-based plants identification as a mean to enlist non-expert contributors and facilitate the production of botanical observation data. One year after the public launch of the mobile application, we carry out a self-critical evaluation of the experience with regard to the requir...
Book
Pl@ntNet est un réseau humain s'appuyant sur une infrastructure informatique, permettant l'identification, l'agrégation et le partage d'observations botaniques à très grande échelle. Cette initiative mobilise différentes institutions de recherche dans divers champs scientifiques (informatique, agronomie, écologie) et de larges réseaux associatifs d...
Article
Full-text available
This paper reports a large-scale experiment aimed at evaluating how state-of-art computer vision systems perform in identifying plants compared to human expertise. A subset of the evaluation dataset used within LifeCLEF 2014 plant identification challenge was therefore shared with volunteers of diverse expertise, ranging from the leading experts of...
Article
Full-text available
Pl@ntNet is an innovative participatory sensing platform relying on image-based plants identification as a mean to enlist non-expert contributors and facilitate the production of botanical observation data. One year after the public launch of the mobile application, we carry out a self-critical evaluation of the experience with regard to the requir...
Book
Partagée entre l’Argentine et le Chili à la pointe australe du continent américain, la Patagonie a de longue date fasciné explorateurs, naturalistes et simples voyageurs. Selon l’altitude, l’exposition aux vents et aux précipitations, ou selon la latitude, ce vaste espace peu habité présente une grande variété de milieux et une flore diversifiée. E...
Article
Partagée entre l'Argentine et le Chili à la pointe australe du continent américain, la Patagonie a de longue date fasciné explorateurs, naturalistes et simples voyageurs. Selon l'altitude, l'exposition aux vents et aux précipitations, ou selon la latitude, ce vaste espace peu habité présente une grande variété de milieux et une flore diversifiée. E...
Article
Full-text available
Invasive species' success may depend on ecophysiological attributes present in their native area or those derived from changes that took place in the invaded environment. We studied the growth and photosynthetic capacity of Berberis darwinii shrubs growing under different light conditions (gap, forest edge and below the canopy) in their native area...
Conference Paper
Full-text available
This paper presents several improvements of Pl@ntNet1, an image sharing and retrieval application for identifying plants [6]: (i) ported to most android platforms (ii) three times more data (iii) exploiting metadata as well as visual content in the identification process (iv) a new multi-plant-organ, multi-image and multi-feature merging strategy w...
Article
Full-text available
This paper describes the participation of Inria within the Pl@ntNet project7 at the LifeCLEF2014 plant identication task. The aim of the task was to produce a list of relevant species for each plant observation in a test dataset according to a training dataset. Each plant observation contains several annotated pictures with organ/view tags: Flower,...
Book
This paper presents several improvements of Pl@ntNet1, an image sharing and retrieval application for identifying plants [6]: (i) ported to most android platforms (ii) three times more data (iii) exploiting metadata as well as visual content in the identification process (iv) a new multi-plant-organ, multi-image and multi-feature merging strategy w...
Conference Paper
Full-text available
This paper presents a synthesis of ImageCLEF 2013 plant identification task, a system-oriented testbed dedicated to the evaluation of image-based plant identification technologies. With 12 participating groups coming from over 9 countries and 33 submitted runs, the 2013 campaign confirmed the increasing interest of the multimedia community in ecolo...
Conference Paper
Full-text available
Pl@ntNet is an image sharing and retrieval application for the identification of plants, available on iPhone and iPad devices. Contrary to previous content-based identification applications it can work with several parts of the plant including flowers, leaves, fruits and bark. It also allows integrating user's observations in the database thanks to...
Article
Speeding up the collection and integration of raw botanical observation data is a crucial step towards a sustainable development of agriculture and the conservation of biodiversity. Initiated in the context of a citizen sciences project, the main contribution of this paper is an innovative collaborative workflow focused on image-based plant identif...
Conference Paper
Full-text available
This paper presents a new interactive web application for the visual identification of plants based on collaborative pictures. Contrary to previous content-based identification methods and systems developed for plants that mainly relied on leaves, or in few other cases on flowers, it makes use of five different organs and plant's views including ha...
Article
Full-text available
Context Understanding the effects of exogenous factors on tree development is of major importance in the current context of global change. Assessing the structure development of trees is difficult given that they are large and complex organisms with lifespan of several decades. Aims We used a retrospective analysis to derive the ontogenetic trends...
Article
The capacity of preformation and neoformation and the structure of winter buds are vegetative attributes that may vary between plant species and according to ontogenetic stages of the same species. The present study describes and evaluates these features for the four tree species of Proteaceae occurring in Patagonia. In particular, it analyzes the...
Conference Paper
Full-text available
This demo presents a crowdsourcing web application dedicated to the access of botanical knowledge through automated identification of plant species by visual content. Inspired by citizen sciences, our aim is to speed up the collection and integration of raw botanical observation data, while providing to potential users an easy and efficient access...
Article
Full-text available
Simultaneous observation of morphological and anatomical markers allowed us to reconstitute the growth pattern of the main axis in two populations of sessile oak aged 15 and 29 years, respectively. The comparison of the morphological features of annual shoots and growth units according to either their ontogenic age or their year of formation allowe...
Article
The growth and branching patterns of the main axis of 6-year-old sessile oak, growing in a natural regeneration in the north of France, were analysed each year retrospectively according to three increasing canopy density conditions: large gap, small gap, and dense canopy. Increasing gap size is associated with an increase in the total height, basal...
Article
Full-text available
The development of the trunk and main branches of approximately 26-year-old Nothofagus pumilio (Poepp. et Endl.) Krasser trees was studied. The length and number of leaves of annual shoots were recorded for 56 trees from a natural population. Morphological and macroanatomical features allowed the identification of shoot apex deaths and the axillary...
Article
Extension growth, number of internodes of the main stem, and sylleptic branches were recorded weekly during the 1994 growing season on 1-year-old Juglans regia L. cv. Lara scions. Date of sylleptic branch production and branch position on the main stem were also recorded. Two main stem types were distinguished according to their growth pattern: con...
Article
Full-text available
During the growing seasons 1994-1995 and 1995-1996, weekly measures of length and number of internodes and morphological observations were made on annual shoots of 11- to 21-year-old Nothofagus dombeyi (Mirb.) Blume trees growing in northern Patagonia, Argentina. Growth period and shoot size at the end of the extension period were highly variable....
Article
Full-text available
Decreasing growth rate (Feeley et al., 2007) and large die-back due to drought (Phillips et al., 2009) suggest that tropical forests are suffering recent climate changes. Forest vulnerability to external factors (e.g. air pollution, acid rain) is widely studied in northern countries, while only a few attempts have investigated crown integrity in th...
Conference Paper
Full-text available
Image CLEF' plant identification task provides a testbed for the system-oriented evaluation of tree species identification based on leaf images. The aim is to investigate image retrieval approaches in the context of crowdsourced images of leaves collected in a collaborative manner. This paper presents an overview of the resources and assessments of...
Article
Full-text available
The Bornean climber, Nepenthes bicalcarata, is unique among plants because it is both carnivorous and myrmecophytic, bearing pitcher-shaped leaves and the ant Camponotus schmitzi within tendrils. We explored, in the peat swamp forests of Brunei, the hypothesis that these ants contribute to plant nutrition by catching and digesting its prey.Wefirst...
Article
Full-text available
Variations in the architecture and axis structure of different growth forms of Nothofagus pumilio (Poepp. et Endl.) Krasser (Nothofagaceae) were studied along an altitudinal gradient. We evaluated the primary growth and branching pattern of annual shoots belonging to the main axis categories (trunk, main branches, and secondary (short) branches) of...
Article
Full-text available
Face a la complexite des structures arborescentes et en fonction d'objectifs particuliers, divers types de modeles de croissance et de production des arbres et peuplements fgorestiers se sont developpes. Il est ainsi possible de distinguer : des modeles de type statistique, des modeles de production vegetale, etc... Dans le domaine de la simulation...
Article
Full-text available
The strong influence of environment and functioning on plant organogenesis has been well documented by botanists but is poorly reproduced in most functional-structural models. In this context, a model of interactions is proposed between plant organogenesis and plant functional mechanisms. The GreenLab model derived from AMAP models was used. Organo...
Article
A checklist is presented of the orchid flora of Laos, enumerating 485 species in 108 genera. An estimate is given of the expected size of the orchid flora of Laos. Notes on habitat, global and local distribution, endemism, conservation, phenology, as well as a systematic overview complement the checklist.
Article
The aim of this study was to characterise the remarkable architectural development of the orchid species Chrysoglossum ornatum Blume. Living specimens were collected in two sites in Laos, a country where this species had not been recorded before. Examination of herbarium material of the three other species of Chrysoglossum has confirmed the regular...
Article
This article attempts to describe the state of the art in building efficient dynamical plant growth and architecture models that contain the basic knowledge coming from botany, ecophysiology, agronomy, applied mathematics, and computer sciences. Plant architecture is the result of two processes working together: plant development, that concerns mer...
Article
Although species of arid environments share physiological and morphological strategies to reduce plant transpiration and protect leaves from excessive radiation and wind desiccation, they differ significantly in growth form, aboveground architecture, and rate of leaf turnover. We studied shoot growth pattern and leaf phenology in relation to rainfa...
Article
Full-text available
The dynamical system of plant growth GREENLAB was originally developed for individual plants, without explicitly taking into account interplant competition for light. Inspired by the competition models developed in the context of forest science for mono-specific stands, we propose to adapt the method of crown projection onto the x-y plane to GREENL...
Article
Full-text available
To model plasticity of plants in their environment, a new version of the functional-structural model GREENLAB has been developed with full interactions between architecture and functioning. Emergent properties of this model were revealed by simulations, in particular the automatic generation of rhythms in plant development. Such behaviour can be ob...
Article
Full-text available
AmapSim is a tool that implements a structural plant growth model based on a botanical theory and simulates plant morphogenesis to produce accurate, complex and detailed plant architectures. This software is the result of more than a decade of research and development devoted to plant architecture. New advances in the software development have yiel...
Article
Full-text available
PMA06: The Second International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications, 13-17 novembre 2006, Beijing, P. R. China.
Article
Full-text available
Identification of crop weeds is essential to get the information needed for elaborating efficient control methods. Non specialised people had difficulties to do this identification with classical tools, such as floras or field guides (too technical, unsuitable for seedlings or partial samples, process difficult to follow...). That brought us to dev...