A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges

We studied the geographic variation of three morphometric characters in relation to body size in two South American grasshoppers (Acrididae), Dichroplus vittatus Bruner and D. pratensis Bruner to test Allen's rule in these ectotherms. Since both species follow the converse to Bergmann's ru...

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Autor principal:	Bidau, Claudio Juan
Publicado:	2008
Materias:	Allometry Body proportion Body size Dichroplus Geographic variation altitude animal Argentina article body size ecosystem female geography grasshopper histology male physiology reproduction season sex difference species difference thermoregulation Altitude Animals Body Size Body Temperature Regulation Ecosystem Female Geography Grasshoppers Male Reproduction Seasons Sex Factors Species Specificity Acrididae Dichroplus pratensis Dichroplus vittatus Orthoptera Schistocerca americana
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1519566X_v37_n4_p370_Bidau http://hdl.handle.net/20.500.12110/paper_1519566X_v37_n4_p370_Bidau
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_1519566X_v37_n4_p370_Bidau
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spelling	paper:paper_1519566X_v37_n4_p370_Bidau2023-06-08T16:18:43Z A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges Bidau, Claudio Juan Allometry Body proportion Body size Dichroplus Geographic variation altitude animal Argentina article body size ecosystem female geography grasshopper histology male physiology reproduction season sex difference species difference thermoregulation Altitude Animals Argentina Body Size Body Temperature Regulation Ecosystem Female Geography Grasshoppers Male Reproduction Seasons Sex Factors Species Specificity Acrididae Dichroplus Dichroplus pratensis Dichroplus vittatus Orthoptera Schistocerca americana We studied the geographic variation of three morphometric characters in relation to body size in two South American grasshoppers (Acrididae), Dichroplus vittatus Bruner and D. pratensis Bruner to test Allen's rule in these ectotherms. Since both species follow the converse to Bergmann's rule owing to latitudinal and/or altitudinal variation in time available for growth and reproduction, geographic variation in body size proportions of protruding parts may obey to differential allometric growth in different geographic areas. Alternatively, it could reflect true Allenian variation related to thermoregulation. Body proportions were studied by correlation/regression analyses with geographic and climatic variables. In D. pratensis, body proportions increased with latitude and decreased with altitude. These results probably obey to the effects of water balance and seasonality on final body size, and on the allometric growth of the three studied characters not being related to thermoregulation. In D. vittatus, a generally non-significant trend towards the decrease of the mean proportions of all three characters with increasing latitude was observed. Nevertheless, also in this species, it is probable that the environmental gradient responds to seasonality factors (although not to water balance) that affect the length of growing season and, in consequence, body size and its allometric relationships. We conclude that the regularities in the geographic distribution of body proportions of D. pratensis and D. vittatus do not follow Allen's rule in the sense of thermoregulation, and result from variables that determine growing season length and the allometric growth of different body parts. Fil:Bidau, C.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1519566X_v37_n4_p370_Bidau http://hdl.handle.net/20.500.12110/paper_1519566X_v37_n4_p370_Bidau
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Allometry Body proportion Body size Dichroplus Geographic variation altitude animal Argentina article body size ecosystem female geography grasshopper histology male physiology reproduction season sex difference species difference thermoregulation Altitude Animals Argentina Body Size Body Temperature Regulation Ecosystem Female Geography Grasshoppers Male Reproduction Seasons Sex Factors Species Specificity Acrididae Dichroplus Dichroplus pratensis Dichroplus vittatus Orthoptera Schistocerca americana
spellingShingle	Allometry Body proportion Body size Dichroplus Geographic variation altitude animal Argentina article body size ecosystem female geography grasshopper histology male physiology reproduction season sex difference species difference thermoregulation Altitude Animals Argentina Body Size Body Temperature Regulation Ecosystem Female Geography Grasshoppers Male Reproduction Seasons Sex Factors Species Specificity Acrididae Dichroplus Dichroplus pratensis Dichroplus vittatus Orthoptera Schistocerca americana Bidau, Claudio Juan A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges
topic_facet	Allometry Body proportion Body size Dichroplus Geographic variation altitude animal Argentina article body size ecosystem female geography grasshopper histology male physiology reproduction season sex difference species difference thermoregulation Altitude Animals Argentina Body Size Body Temperature Regulation Ecosystem Female Geography Grasshoppers Male Reproduction Seasons Sex Factors Species Specificity Acrididae Dichroplus Dichroplus pratensis Dichroplus vittatus Orthoptera Schistocerca americana
description	We studied the geographic variation of three morphometric characters in relation to body size in two South American grasshoppers (Acrididae), Dichroplus vittatus Bruner and D. pratensis Bruner to test Allen's rule in these ectotherms. Since both species follow the converse to Bergmann's rule owing to latitudinal and/or altitudinal variation in time available for growth and reproduction, geographic variation in body size proportions of protruding parts may obey to differential allometric growth in different geographic areas. Alternatively, it could reflect true Allenian variation related to thermoregulation. Body proportions were studied by correlation/regression analyses with geographic and climatic variables. In D. pratensis, body proportions increased with latitude and decreased with altitude. These results probably obey to the effects of water balance and seasonality on final body size, and on the allometric growth of the three studied characters not being related to thermoregulation. In D. vittatus, a generally non-significant trend towards the decrease of the mean proportions of all three characters with increasing latitude was observed. Nevertheless, also in this species, it is probable that the environmental gradient responds to seasonality factors (although not to water balance) that affect the length of growing season and, in consequence, body size and its allometric relationships. We conclude that the regularities in the geographic distribution of body proportions of D. pratensis and D. vittatus do not follow Allen's rule in the sense of thermoregulation, and result from variables that determine growing season length and the allometric growth of different body parts.
author	Bidau, Claudio Juan
author_facet	Bidau, Claudio Juan
author_sort	Bidau, Claudio Juan
title	A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges
title_short	A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges
title_full	A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges
title_fullStr	A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges
title_full_unstemmed	A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges
title_sort	test of allen's rule in ectotherms: the case of two south american melanopline grasshoppers (orthoptera: acrididae) with partially overlapping geographic ranges
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1519566X_v37_n4_p370_Bidau http://hdl.handle.net/20.500.12110/paper_1519566X_v37_n4_p370_Bidau
work_keys_str_mv	AT bidauclaudiojuan atestofallensruleinectothermsthecaseoftwosouthamericanmelanoplinegrasshoppersorthopteraacrididaewithpartiallyoverlappinggeographicranges AT bidauclaudiojuan testofallensruleinectothermsthecaseoftwosouthamericanmelanoplinegrasshoppersorthopteraacrididaewithpartiallyoverlappinggeographicranges
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A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges

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