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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todo:paper_1519566X_v37_n4_p370_Bidau2023-10-03T16:19:56Z A test of Allen's rule in ectotherms: The case of two south American Melanopline Grasshoppers (Orthoptera: Acrididae) with partially overlapping geographic ranges Bidau, C.J. Martí, D.A. 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. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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) |
| language |
English |
| orig_language_str_mv |
English |
| 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, C.J. Martí, D.A. 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. |
| format |
JOUR |
| author |
Bidau, C.J. Martí, D.A. |
| author_facet |
Bidau, C.J. Martí, D.A. |
| author_sort |
Bidau, C.J. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_1519566X_v37_n4_p370_Bidau |
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