Clustering species using a model of population dynamics and aggregation theory

Picard Nicolas, Mortier Frédéric, Rossi Vivien, Gourlet-Fleury Sylvie. 2010. Clustering species using a model of population dynamics and aggregation theory. Ecological Modelling, 221 (2) : 152-160.

Quartile : Q3, Sujet : ECOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion

Résumé : The high species diversity of some ecosystems like tropical rainforests goes in pair with the scarcity of data for most species. This hinders the development of models that require enough data for fitting. The solution commonly adopted by modellers consists in grouping species to form more sizeable data sets. Classical methods for grouping species such as hierarchical cluster analysis do not take account of the variability of the species characteristics used for clustering. In this study a clustering method based on aggregation theory is presented. It takes account of the variability of species characteristics by searching for the grouping that minimizes the quadratic error (square bias plus variance) of some model's prediction. This method allows one to check whether the gain in variance brought by data pooling compensate for the bias that it introduces. This method was applied to a data set on 94 tree species in a tropical rainforest in French Guiana, using a Usher matrix model to predict species dynamics. An optimal trade-off between bias and variance was found when grouping species. Grouping species appeared to decrease the quadratic error, except when the number of groups was very small. This clustering method yielded species groups similar to those of the hierarchical cluster analysis using Ward's method when variance was small, that is when the number of groups was small.

Mots-clés Agrovoc : forêt tropicale humide, espèce, classification, modèle mathématique, peuplement forestier, dynamique des populations

Mots-clés géographiques Agrovoc : Guyane française, France

Classification Agris : U10 - Informatique, mathématiques et statistiques
K01 - Foresterie - Considérations générales
F40 - Écologie végétale

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Picard Nicolas, CIRAD-ES-UPR Dynamique forestière (GAB)
• Mortier Frédéric, CIRAD-BIOS-UPR Génétique forestière (FRA)
• Rossi Vivien, CIRAD-ES-UPR Dynamique forestière (FRA) ORCID: 0000-0001-5458-1523
• Gourlet-Fleury Sylvie, CIRAD-ES-UPR Dynamique forestière (FRA) ORCID: 0000-0002-1136-4307

Source : Cirad - Agritrop (https://agritrop.cirad.fr/552415/)

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