Latitudinal shift in the timing of flowering of tree species across tropical Africa: Insights from field observations and herbarium collections

Ouédraogo Dakis-Yaoba, Hardy Olivier J., Doucet Jean-Louis, Janssens Steven B., Wieringa Jan J., Stoffelen Piet, Angoboy Ilondea Bhely, Baya Fidèle, Beeckman Hans, Daïnou Kasso, Dubiez Emilien, Gourlet-Fleury Sylvie, Fayolle Adeline. 2020. Latitudinal shift in the timing of flowering of tree species across tropical Africa: Insights from field observations and herbarium collections. Journal of Tropical Ecology, 36 : 159-173.

Quartile : Q4, Sujet : ECOLOGY

Résumé : Temporal and spatial patterns in flowering phenology were assessed for eight tropical Africantree species. Specifically, the frequency and seasonality of flowering at seven sites in central Africawere determined using field data, graphical analysis and circular statistics. Additionally, spatialvariation in the timing of flowering across species range was investigated using herbarium data,analysing the relative influence of latitude, longitude and timing of the dry season with aBayesian circular generalized linear model. Annual flowering was found for 20 out of the 25 pop-ulations studied. For 21 populations located at the north of the climatic hinge flowering wasoccurring during the dry season. The analysis of herbarium collections revealed a significant shiftin the timing of flowering with latitude forE. suaveolens, and with the timing of the dry season forM. excelsa(and to a lesser extentL. alata), with the coexistence of two flowering peaks near theequator where the distribution of monthly rainfall is bimodal. For the other species, none of latitude,longitude or timing of the dry season had an effecton the timing of flowering. Our study highlightsthe need to identify the drivers of the flowering phenology of economically important African treespecies.

Mots-clés Agrovoc : arbre pour bois de construction, Lophira alata, floraison, conditions météorologiques, facteur du milieu, comportement reproductif, précipitation

Mots-clés géographiques Agrovoc : Afrique, Afrique tropicale

Mots-clés complémentaires : lattitude, Erythrophleum suaveolens, Milicia excelsa

Mots-clés libres : Climatic hinge, Dry season, Flowering, Herbarium, Phenology, Timber species

Classification Agris : F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Ouédraogo Dakis-Yaoba, AgroParisTech (BEL) - auteur correspondant
• Hardy Olivier J., ULB (BEL)
• Doucet Jean-Louis, AgroParisTech (BEL)
• Janssens Steven B., Botanic Garden Meise (BEL)
• Wieringa Jan J., National Herbarium (NLD)
• Stoffelen Piet, Botanic Garden Meise (BEL)
• Angoboy Ilondea Bhely, INERA (COD)
• Baya Fidèle, Ministère des eaux et forêts, chasses, pêches et tourisme (République centrafricaine) (CAF)
• Beeckman Hans, Musée royal de l'Afrique centrale (BEL)
• Daïnou Kasso, Université de Liège (BEL)
• Dubiez Emilien, CIRAD-ES-UPR Forêts et sociétés (COG) ORCID: 0000-0002-7097-5263
• Gourlet-Fleury Sylvie, CIRAD-ES-UPR Forêts et sociétés (FRA) ORCID: 0000-0002-1136-4307
• Fayolle Adeline, AgroParisTech (BEL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/596436/)

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