Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.

Competition is a driving force regulating communities often considered an intermittent phenomenon, difficult to verify and potentially driven by environmental disturbances. Insecticides are agents of environmental disturbance that can potentially change ecological relationships and competitive outco...

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Autores principales:	Erick Maurício G Cordeiro, Alberto S Corrêa, Raul Narciso C Guedes
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/72783fc015e941cf8a64f857b677c0d9
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spelling	oai:doaj.org-article:72783fc015e941cf8a64f857b677c0d92021-11-11T08:21:55ZInsecticide-mediated shift in ecological dominance between two competing species of grain beetles.1932-620310.1371/journal.pone.0100990https://doaj.org/article/72783fc015e941cf8a64f857b677c0d92014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24959673/?tool=EBIhttps://doaj.org/toc/1932-6203Competition is a driving force regulating communities often considered an intermittent phenomenon, difficult to verify and potentially driven by environmental disturbances. Insecticides are agents of environmental disturbance that can potentially change ecological relationships and competitive outcomes, but this subject has seldom been examined. As the co-existing cereal grain beetle species Sitophilus zeamais Motschulsky and Rhyzopertha dominica F. share a common realized niche, directly competing for the same resources, they were used as models in our study. Intraspecific competition experiments were performed with increasing insect densities and insecticide doses in additive and replacement series using various density combinations of both beetle species maintained on insecticide-free or -sprayed grains. Insecticide-mediated release from competitive stress was not observed in our study of intraspecific competition in grain beetles. The insecticide enhanced the effect of insect density, particularly for the maize weevil S. zeamais, further impairing population growth at high densities. Therefore, insecticide susceptibility increased with intraspecific competition favoring insecticide efficacy. However, the effect of insecticide exposure on competitive interaction extends beyond intraspecific competition, affecting interspecific competition as well. Sitophilus zeamais was the dominant species when in interspecific competition prevailing in natural conditions (without insecticide exposure), but the dominance and species prevalence shifted from S. zeamais to R. dominica under insecticide exposure. Therefore, high conspecific densities favored insecticide efficacy, but the strength of the relationship differs with the species. In addition, the insecticide mediated a shift in species dominance and competition outcome indicating that insecticides are relevant mediators of species interaction, potentially influencing community composition and raising management concerns as potential cause of secondary pest outbreaks.Erick Maurício G CordeiroAlberto S CorrêaRaul Narciso C GuedesPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 6, p e100990 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Erick Maurício G Cordeiro Alberto S Corrêa Raul Narciso C Guedes Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.
description	Competition is a driving force regulating communities often considered an intermittent phenomenon, difficult to verify and potentially driven by environmental disturbances. Insecticides are agents of environmental disturbance that can potentially change ecological relationships and competitive outcomes, but this subject has seldom been examined. As the co-existing cereal grain beetle species Sitophilus zeamais Motschulsky and Rhyzopertha dominica F. share a common realized niche, directly competing for the same resources, they were used as models in our study. Intraspecific competition experiments were performed with increasing insect densities and insecticide doses in additive and replacement series using various density combinations of both beetle species maintained on insecticide-free or -sprayed grains. Insecticide-mediated release from competitive stress was not observed in our study of intraspecific competition in grain beetles. The insecticide enhanced the effect of insect density, particularly for the maize weevil S. zeamais, further impairing population growth at high densities. Therefore, insecticide susceptibility increased with intraspecific competition favoring insecticide efficacy. However, the effect of insecticide exposure on competitive interaction extends beyond intraspecific competition, affecting interspecific competition as well. Sitophilus zeamais was the dominant species when in interspecific competition prevailing in natural conditions (without insecticide exposure), but the dominance and species prevalence shifted from S. zeamais to R. dominica under insecticide exposure. Therefore, high conspecific densities favored insecticide efficacy, but the strength of the relationship differs with the species. In addition, the insecticide mediated a shift in species dominance and competition outcome indicating that insecticides are relevant mediators of species interaction, potentially influencing community composition and raising management concerns as potential cause of secondary pest outbreaks.
format	article
author	Erick Maurício G Cordeiro Alberto S Corrêa Raul Narciso C Guedes
author_facet	Erick Maurício G Cordeiro Alberto S Corrêa Raul Narciso C Guedes
author_sort	Erick Maurício G Cordeiro
title	Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.
title_short	Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.
title_full	Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.
title_fullStr	Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.
title_full_unstemmed	Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.
title_sort	insecticide-mediated shift in ecological dominance between two competing species of grain beetles.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/72783fc015e941cf8a64f857b677c0d9
work_keys_str_mv	AT erickmauriciogcordeiro insecticidemediatedshiftinecologicaldominancebetweentwocompetingspeciesofgrainbeetles AT albertoscorrea insecticidemediatedshiftinecologicaldominancebetweentwocompetingspeciesofgrainbeetles AT raulnarcisocguedes insecticidemediatedshiftinecologicaldominancebetweentwocompetingspeciesofgrainbeetles
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Insecticide-mediated shift in ecological dominance between two competing species of grain beetles.

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