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dc.contributor.author
Bidau, Claudio Juan
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dc.contributor.author
Marti, Dardo Andrea
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dc.date.available
2020-11-24T15:43:25Z
dc.date.issued
2008-12
dc.identifier.citation
Bidau, Claudio Juan; Marti, Dardo Andrea; Contrasting patterns of sexual size dimorphism in the grasshoppers Dichroplus vittatus and D. pratensis (Acrididae, Melanoplinae); Orthopterists' Society; Journal Of Orthoptera Research; 17; 2; 12-2008; 201-211
dc.identifier.issn
1082-6467
dc.identifier.uri
http://hdl.handle.net/11336/118871
dc.description.abstract
Sexual size dimorphism (SSD) can be the result of sexual selection (SS) or natural selection (NS). Due to male-male competition for access to females, SS could favor an increase in male body size. On the other hand, larger size in females could be favored by NS, since egg production is directly correlated with body size. Rensch`s rule states that SSD increases with increasing body size in animals, where males are the larger sex, and decreases when females are larger than males. Thus, Rensch’s rule predicts that in those insects where females are larger than males, SSD should decrease with increasing body size, when comparing populations and species. We analyzed SSD in 19 Argentine populations of the grasshoppers Dichroplus vittatus and 25 of D. pratensis. Both species show latitudinal and altitudinal variation in body size, following the converse to Bergmann’s rule: body size decreases with increasing latitude and decreasing ambient temperature. SSD occurs in both species across their geographical distribution ranges, also involving differences in allometry and shorter developmental times in males. In D. vittatus, the degree of SSD increased significantly with general body size, whereas in D. pratensis SSD decreased as body size increased. A plausible explanation of SSD is that SS favors a differential increase in female body size related to a preference by males for more fecund females. Given the close phylogenetic relationship between both species, the differences in SSD between them may be the result of differential natural and sexual selective pressures. In D. vittatus both sexes could be reacting differently to environmental conditions regarding body size, while in D. pratensis protandry could be the main factor behind SSD.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Orthopterists' Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Sexual Size Dimorphisms
dc.subject
Natural Selection
dc.subject.classification
Genética y Herencia
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Contrasting patterns of sexual size dimorphism in the grasshoppers Dichroplus vittatus and D. pratensis (Acrididae, Melanoplinae)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-09-18T14:05:02Z
dc.journal.volume
17
dc.journal.number
2
dc.journal.pagination
201-211
dc.journal.pais
Canadá
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dc.description.fil
Fil: Bidau, Claudio Juan. Instituto Oswaldo Cruz; Brasil
dc.description.fil
Fil: Marti, Dardo Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; Argentina
dc.journal.title
Journal Of Orthoptera Research
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://bioone.org/journals/journal-of-orthoptera-research/volume-17/issue-2/1082-6467-17.2.201/Contrasting-patterns-of-sexual-size-dimorphism-in-the-grasshoppers-span/10.1665/1082-6467-17.2.201.full
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1665/1082-6467-17.2.201
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