Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis

Respiration and energy metabolism are key processes in animals, which are severely constrained by the design of physical structures, such as respiratory structures. Insects have very particular respiratory systems, based on gas diffusion across tracheae. Since the efficiency of the tracheal respirat...

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Autores principales:	Nespolo,Roberto F, Sepúlveda,Roger D, Castañeda,Luis E, Roff,Derek A
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2011
Materias:	Shape variations metabolic rate morphology insect respiration orthopter sand crickets
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100009
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spelling	oai:scielo:S0716-976020110001000092011-09-01Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysisNespolo,Roberto FSepúlveda,Roger DCastañeda,Luis ERoff,Derek A Shape variations metabolic rate morphology insect respiration orthopter sand crickets Respiration and energy metabolism are key processes in animals, which are severely constrained by the design of physical structures, such as respiratory structures. Insects have very particular respiratory systems, based on gas diffusion across tracheae. Since the efficiency of the tracheal respiratory system is highly dependent on body shape, the pattern of morphological variation during ontogeny could have important metabolic consequences. We studied this problem combining through-flow respirometry and geometric morphometrics in 88 nymphs of the sand cricket, Gryllus firmus. After measuring production in each individual, we took digital photographs and defined eight landmarks for geometric morphometric analysis. The analysis suggested that ontogenic deformations were mostly related to enlargement of the abdomen, compared to thorax and head. We found that (controlling for body size) metabolic variables and especially resting metabolism are positively correlated with a shape-component associated to an elongation of the abdomen. Our results are in agreement with the mechanics of tracheal ventilation in orthopterans, as gas circulation occurs by changes in abdominal pressures due to abdominal contractions and expansions along the longitudinal axis.info:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.44 n.1 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100009en10.4067/S0716-97602011000100009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Shape variations metabolic rate morphology insect respiration orthopter sand crickets
spellingShingle	Shape variations metabolic rate morphology insect respiration orthopter sand crickets Nespolo,Roberto F Sepúlveda,Roger D Castañeda,Luis E Roff,Derek A Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis
description	Respiration and energy metabolism are key processes in animals, which are severely constrained by the design of physical structures, such as respiratory structures. Insects have very particular respiratory systems, based on gas diffusion across tracheae. Since the efficiency of the tracheal respiratory system is highly dependent on body shape, the pattern of morphological variation during ontogeny could have important metabolic consequences. We studied this problem combining through-flow respirometry and geometric morphometrics in 88 nymphs of the sand cricket, Gryllus firmus. After measuring production in each individual, we took digital photographs and defined eight landmarks for geometric morphometric analysis. The analysis suggested that ontogenic deformations were mostly related to enlargement of the abdomen, compared to thorax and head. We found that (controlling for body size) metabolic variables and especially resting metabolism are positively correlated with a shape-component associated to an elongation of the abdomen. Our results are in agreement with the mechanics of tracheal ventilation in orthopterans, as gas circulation occurs by changes in abdominal pressures due to abdominal contractions and expansions along the longitudinal axis.
author	Nespolo,Roberto F Sepúlveda,Roger D Castañeda,Luis E Roff,Derek A
author_facet	Nespolo,Roberto F Sepúlveda,Roger D Castañeda,Luis E Roff,Derek A
author_sort	Nespolo,Roberto F
title	Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis
title_short	Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis
title_full	Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis
title_fullStr	Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis
title_full_unstemmed	Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis
title_sort	effects of shape variations on the energy metabolism of the sand cricket gryllus firmus: a geometric morphometric analysis
publisher	Sociedad de Biología de Chile
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100009
work_keys_str_mv	AT nespolorobertof effectsofshapevariationsontheenergymetabolismofthesandcricketgryllusfirmusageometricmorphometricanalysis AT sepulvedarogerd effectsofshapevariationsontheenergymetabolismofthesandcricketgryllusfirmusageometricmorphometricanalysis AT castanedaluise effectsofshapevariationsontheenergymetabolismofthesandcricketgryllusfirmusageometricmorphometricanalysis AT roffdereka effectsofshapevariationsontheenergymetabolismofthesandcricketgryllusfirmusageometricmorphometricanalysis
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Effects of shape variations on the energy metabolism of the sand cricket Gryllus firmus: a geometric morphometric analysis

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