Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation

Autores
Mariottini, Yanina; Scattolini, María Celeste; Cigliano, María Marta; Lange, Carlos Ernesto
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Dichroplus maculipennis is one of the most damaging grasshopper species of Argentina. Individuals of this species at high density are historically known to show aggregation behavior and dispersal flights, attributes that might suggest that it does exhibit to some extent phase polyphenism in relation to population density. Phase polyphenism is a complex phenomenon and the amplitude of phase change is usually species-dependent. Morphological differences between gregarious and solitarious locusts can be measured and analyzed in order to characterize the phase status. The objective of this study was to evaluate morphometric differences between individuals of a D. maculipennis field population in the southern Pampas region of Argentina during non-outbreak and outbreak conditions including the magnitude of sexual size dimorphism related to variation in density. Collected individuals in the outbreak condition totaled 804 (422 females, 382 males) and those in non-outbreak condition were 325 (141 females, 184 males). Six morphometric characters were measured and two ratios (F/C and E/F) usually used to discriminate between solitarious and gregarious individuals in true locust species were calculated. Results show that size traits of D. maculipennis change over time at the population level, and that these changes correlate with outbreak vs non-outbreak populations. Females and males of D. maculipennis in outbreak conditions are significantly larger than in non-outbreak conditions. Furthermore, significant change over time was recorded in values of the two ratios calculated. D. maculipennis showed female biased sexual size dimorphism in both outbreak and non-outbreak conditions. There is a smaller difference in body size among females and males in outbreak conditions than in females and males in non-outbreak conditions. These results may be an indication of the presence of densitydependent phenotypic plasticity in this species, but additional experiments are required in order to establish a causal relationship between population density and changes in size traits.
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
agricultural pest, phase polyphenism, grasshopper, locust, morphometric traits, Pampas region
Insectos
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/77692

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network_name_str SEDICI (UNLP)
spelling Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak SituationMariottini, YaninaScattolini, María CelesteCigliano, María MartaLange, Carlos ErnestoCiencias Naturalesagricultural pest, phase polyphenism, grasshopper, locust, morphometric traits, Pampas regionInsectosDichroplus maculipennis is one of the most damaging grasshopper species of Argentina. Individuals of this species at high density are historically known to show aggregation behavior and dispersal flights, attributes that might suggest that it does exhibit to some extent phase polyphenism in relation to population density. Phase polyphenism is a complex phenomenon and the amplitude of phase change is usually species-dependent. Morphological differences between gregarious and solitarious locusts can be measured and analyzed in order to characterize the phase status. The objective of this study was to evaluate morphometric differences between individuals of a D. maculipennis field population in the southern Pampas region of Argentina during non-outbreak and outbreak conditions including the magnitude of sexual size dimorphism related to variation in density. Collected individuals in the outbreak condition totaled 804 (422 females, 382 males) and those in non-outbreak condition were 325 (141 females, 184 males). Six morphometric characters were measured and two ratios (F/C and E/F) usually used to discriminate between solitarious and gregarious individuals in true locust species were calculated. Results show that size traits of D. maculipennis change over time at the population level, and that these changes correlate with outbreak vs non-outbreak populations. Females and males of D. maculipennis in outbreak conditions are significantly larger than in non-outbreak conditions. Furthermore, significant change over time was recorded in values of the two ratios calculated. D. maculipennis showed female biased sexual size dimorphism in both outbreak and non-outbreak conditions. There is a smaller difference in body size among females and males in outbreak conditions than in females and males in non-outbreak conditions. These results may be an indication of the presence of densitydependent phenotypic plasticity in this species, but additional experiments are required in order to establish a causal relationship between population density and changes in size traits.Facultad de Ciencias Naturales y Museo2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf67-75http://sedici.unlp.edu.ar/handle/10915/77692enginfo:eu-repo/semantics/altIdentifier/doi/10.1665/034.024.0205info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:13:57Zoai:sedici.unlp.edu.ar:10915/77692Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:13:58.083SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
title Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
spellingShingle Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
Mariottini, Yanina
Ciencias Naturales
agricultural pest, phase polyphenism, grasshopper, locust, morphometric traits, Pampas region
Insectos
title_short Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
title_full Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
title_fullStr Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
title_full_unstemmed Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
title_sort Morphometric Differentiation in a Field Population of Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) under Outbreak and Non-Outbreak Situation
dc.creator.none.fl_str_mv Mariottini, Yanina
Scattolini, María Celeste
Cigliano, María Marta
Lange, Carlos Ernesto
author Mariottini, Yanina
author_facet Mariottini, Yanina
Scattolini, María Celeste
Cigliano, María Marta
Lange, Carlos Ernesto
author_role author
author2 Scattolini, María Celeste
Cigliano, María Marta
Lange, Carlos Ernesto
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Naturales
agricultural pest, phase polyphenism, grasshopper, locust, morphometric traits, Pampas region
Insectos
topic Ciencias Naturales
agricultural pest, phase polyphenism, grasshopper, locust, morphometric traits, Pampas region
Insectos
dc.description.none.fl_txt_mv Dichroplus maculipennis is one of the most damaging grasshopper species of Argentina. Individuals of this species at high density are historically known to show aggregation behavior and dispersal flights, attributes that might suggest that it does exhibit to some extent phase polyphenism in relation to population density. Phase polyphenism is a complex phenomenon and the amplitude of phase change is usually species-dependent. Morphological differences between gregarious and solitarious locusts can be measured and analyzed in order to characterize the phase status. The objective of this study was to evaluate morphometric differences between individuals of a D. maculipennis field population in the southern Pampas region of Argentina during non-outbreak and outbreak conditions including the magnitude of sexual size dimorphism related to variation in density. Collected individuals in the outbreak condition totaled 804 (422 females, 382 males) and those in non-outbreak condition were 325 (141 females, 184 males). Six morphometric characters were measured and two ratios (F/C and E/F) usually used to discriminate between solitarious and gregarious individuals in true locust species were calculated. Results show that size traits of D. maculipennis change over time at the population level, and that these changes correlate with outbreak vs non-outbreak populations. Females and males of D. maculipennis in outbreak conditions are significantly larger than in non-outbreak conditions. Furthermore, significant change over time was recorded in values of the two ratios calculated. D. maculipennis showed female biased sexual size dimorphism in both outbreak and non-outbreak conditions. There is a smaller difference in body size among females and males in outbreak conditions than in females and males in non-outbreak conditions. These results may be an indication of the presence of densitydependent phenotypic plasticity in this species, but additional experiments are required in order to establish a causal relationship between population density and changes in size traits.
Facultad de Ciencias Naturales y Museo
description Dichroplus maculipennis is one of the most damaging grasshopper species of Argentina. Individuals of this species at high density are historically known to show aggregation behavior and dispersal flights, attributes that might suggest that it does exhibit to some extent phase polyphenism in relation to population density. Phase polyphenism is a complex phenomenon and the amplitude of phase change is usually species-dependent. Morphological differences between gregarious and solitarious locusts can be measured and analyzed in order to characterize the phase status. The objective of this study was to evaluate morphometric differences between individuals of a D. maculipennis field population in the southern Pampas region of Argentina during non-outbreak and outbreak conditions including the magnitude of sexual size dimorphism related to variation in density. Collected individuals in the outbreak condition totaled 804 (422 females, 382 males) and those in non-outbreak condition were 325 (141 females, 184 males). Six morphometric characters were measured and two ratios (F/C and E/F) usually used to discriminate between solitarious and gregarious individuals in true locust species were calculated. Results show that size traits of D. maculipennis change over time at the population level, and that these changes correlate with outbreak vs non-outbreak populations. Females and males of D. maculipennis in outbreak conditions are significantly larger than in non-outbreak conditions. Furthermore, significant change over time was recorded in values of the two ratios calculated. D. maculipennis showed female biased sexual size dimorphism in both outbreak and non-outbreak conditions. There is a smaller difference in body size among females and males in outbreak conditions than in females and males in non-outbreak conditions. These results may be an indication of the presence of densitydependent phenotypic plasticity in this species, but additional experiments are required in order to establish a causal relationship between population density and changes in size traits.
publishDate 2015
dc.date.none.fl_str_mv 2015
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Articulo
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