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Ntiri E. S., Calatayud Paul-André, Van den Berg J., Le Rü Bruno. (2017). Density dependence and temporal plasticity of competitive interactions during utilisation of resources by a community of lepidopteran stemborer species. Entomologia Experimentalis et Applicata, 162 (3), 272-283. ISSN 0013-8703

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Lien direct chez l'éditeur doi:10.1111/eea.12514

Titre
Density dependence and temporal plasticity of competitive interactions during utilisation of resources by a community of lepidopteran stemborer species
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000397522400002
AuteursNtiri E. S., Calatayud Paul-André, Van den Berg J., Le Rü Bruno.
SourceEntomologia Experimentalis et Applicata, 2017, 162 (3), p. 272-283. ISSN 0013-8703
RésuméInteractions within and between species sharing the same resources are characterised by competition or facilitation, and can be influenced by factors such as larval numbers and phenotypic plasticity of the interactions. The effect of larval density on the survival and relative growth rate of the stemborers Busseola fusca (Fuller) and Sesamia calamistis Hampson (both Lepidoptera: Noctuidae), and Chilo partellus (Swinhoe) (Lepidoptera: Crambidae) were studied, as well as the temporal plasticity of their competitive interactions. These stemborers attack maize crops (Zea mays L.) (Poaceae) in sub-Saharan Africa. Experiments were conducted in the laboratory under controlled conditions at the optimum development temperature (25 degrees C) for the three species. Surrogate stems filled with artificial diet were intra- and interspecifically infested with larvae of each species. The effect of larval density on competition was studied at low (six larvae) and high (12 larvae) levels of infestation, whereas the temporal plasticity of competition was evaluated at 7, 14, 21, or 28days after infestation. The two experiments involved single- and multi-species infestation treatments. Larval numbers and wet mass in each artificial stem were recorded in each experiment. Survival and relative growth rate of the three species were significantly higher at low-infestation levels when facing either intra- or interspecific competition. The intensity of competition was also temporally plastic among the species and increased as the duration of competition increased. These results are discussed in terms of general infestations of cereal crops by borers.
Plan de classementSciences du monde végétal [076] ; Sciences du monde animal [080]
Descr. géo.AFRIQUE SUBSAHARIENNE
LocalisationFonds IRD [F B010069415]
Identifiant IRDfdi:010069415
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010069415

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