Sexual dimorphism of extensor carpi radialis muscle size, isometric force, relaxation rate and stamina during the breeding season of the frog<i>Rana temporaria</i>Linnaeus 1758

Navas, Carlos A.; James, Rob S.

doi:10.1242/jeb.000646

Cited by 34 publications

(38 citation statements)

References 24 publications

(50 reference statements)

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“…We performed separate analyses for cold-and warm-acclimated animals, and for data collected at 20°C and 30°C test temperatures. We used the truncated product method (65,98) to assess the effect of multiple comparisons on the validity of P values in the correlation matrices. Briefly, the truncated product method considers the distribution of P values from multiple hypothesis tests to provide a table-wide P value for the overall hypothesis that significant results in the set were truly significant rather than being due to chance (98).…”

Section: Discussionmentioning

confidence: 99%

Plasticity of muscle function in a thermoregulating ectotherm (Crocodylus porosus): biomechanics and metabolism

Seebacher¹,

James²

2008

American Journal of Physiology-Regulatory, Integrative and Comp

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Seebacher F, James RS. Plasticity of muscle function in a thermoregulating ectotherm (Crocodylus porosus): biomechanics and metabolism. Am J Physiol Regul Integr Comp Physiol 294: R1024-R1032, 2008. First published January 16, 2007 doi:10.1152/ajpregu.00755.2007.-Thermoregulation and thermal sensitivity of performance are thought to have coevolved so that performance is optimized within the selected body temperature range. However, locomotor performance in thermoregulating crocodiles (Crocodylus porosus) is plastic and maxima shift to different selected body temperatures in different thermal environments. Here we test the hypothesis that muscle metabolic and biomechanical parameters are optimized at the body temperatures selected in different thermal environments. Hence, we related indices of anaerobic (lactate dehydrogenase) and aerobic (cytochrome c oxidase) metabolic capacities and myofibrillar ATPase activity to the biomechanics of isometric and work loop caudofemoralis muscle function. Maximal isometric stress (force per muscle cross-sectional area) did not change with thermal acclimation, but muscle work loop power output increased with cold acclimation as a result of shorter activation and relaxation times. The thermal sensitivity of myofibrillar ATPase activity decreased with cold acclimation in caudofemoralis muscle. Neither aerobic nor anaerobic metabolic capacities were directly linked to changes in muscle performance during thermal acclimation, although there was a negative relationship between anaerobic capacity and isometric twitch stress in cold-acclimated animals. We conclude that by combining thermoregulation with plasticity in biomechanical function, crocodiles maximize performance in environments with highly variable thermal properties. body temperature; thermal acclimation; locomotion; work loop; enzymes PHYSICAL PERFORMANCE OF VERTEBRATES may be constrained by limited capacity to respond to environmental change, and individuals that are most effective in compensating for environmental variability will gain a selective advantage (75). Selection can be partitioned into a performance gradient and a fitness gradient (4). The former relates variation in biochemical, physiological, or morphological traits to a measure of ecologically relevant performance, and the latter quantifies the effect of variance in performance on fitness (4, 56). Locomotion is closely linked to Darwinian fitness because of its influence on foraging success and escape from predators (36,40,45,63,83,84) as well as on social status (23). For example, maximal sprint speed in male lizards (Crotaphytus collaris) is a reliable predictor of territory size and defense (39, 68), and faster lizards have significantly greater reproductive output (38).Although locomotor performance is heritable (21,46,58,88), there is considerable within-generation variability as a result of environmental effects and gene-environment interactions (14, 58, 73). Locomotor performance is determined by underlying intrinsic muscle properties, such as muscl...

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Section: Discussionmentioning

confidence: 99%

Plasticity of muscle function in a thermoregulating ectotherm (Crocodylus porosus): biomechanics and metabolism

Seebacher¹,

James²

2008

American Journal of Physiology-Regulatory, Integrative and Comp

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“…Takahashi et al 2001;Funakoshi 2005; this study). Even more compelling is the evidence that animals possess morphological adaptations that increase their mechanical advantage when defending a resource (Lee 2001;Navas & James 2007 …”

Section: Discussionmentioning

confidence: 99%

What factors contribute to an ownership advantage?

2007

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In most taxa, owners win fights when defending a territory against intruders. We calculated effect sizes for four factors that potentially contribute to an 'owner advantage'. We studied male fiddler crabs Uca mjoebergi, where owners won 92% of natural fights. Owners were not more successful because they were inherently better fighters (rZ0.02). There was a small effect (rZ0.18) of the owner's knowledge of territory quality (food availability) and a medium effect (rZ0.29) of his having established relations with neighbours (duration of active tenure), but neither was statistically significant. There was, however, a significant effect due to the mechanical advantage the owner gained through access to the burrow during fights (rZ0.48, p!0.005).

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“…In all other anurans with conventional inguinal or axillary amplexus (see below), males have heavier forelimb muscles than females (Kirby, 1983;Oka et al, 1984;Yekta & Blackburn, 1992;Sidor & Blackburn, 1998;Peters & Aulner, 2000;Clark & Peters, 2006;Navas & James, 2007;Liao et al, 2012a;Mi, 2012). Sexual selection can promote the evolution of morphology and behavior that may increase male mating success (Andersson, 1994).…”

Section: Discussionmentioning

confidence: 99%

“…Males have much more robust forelimbs than females, even though the females are larger in body size (Kirby, 1983;Oka et al, 1984;Yekta & Blackburn, 1992;Peters & Aulner, 2000;Lee, 2001;Clark & Peters, 2006;Navas & James, 2007;Liao et al, 2012a;Mi, 2012). The cause of this sexual divergence is generally thought to be associated with amplexus: the common mating strategy in anurans where the male typically mounts the female and adopts a "clasping" posture while awaiting and during oviposition (Duellman, 1992;Lee, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, males with robust hindlimbs may have a locomotor advantage in finding mates (Wells, 1979;Halliday, 1980;Lee & Corrales, 2002). Therefore, the sexual dimorphisms in limb muscles can be regarded as a consequence of sexual selection resulting from malemale competition (Lee & Corrales, 2002;Clark & Peters, 2006;Navas & James, 2007).…”

Section: Introductionmentioning

confidence: 99%

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No sexual dimorphism in limb muscles of a frog not engaging in amplexus

et al. 2013

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Sexual dimorphism in limb muscles is widespread among anurans, with males having stronger limbs than females. This phenomenon has been interpreted in the context of intrasexual selection: 1) the robust forelimb muscles in males are associated with amplexus, in which the male tries to grasp the female tightly, and also with rejection of rivals' attempts at taking over, and 2) massive hindlimb muscles favor the ability to kick away rivals during scramble competition. However, in a few species, fertilization occurs without any form of amplexus and in these species the hmb muscle dimorphism is expected to be absent. We tested this prediction in Feirana taihangnicus: a species without amplexus. As expected, we detected non-significant sexual differences in the mass of both forelimb and hindlimb muscles after accounting for body size and age. Our findings represent an interesting example of coevolution of form and function.

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Sexual dimorphism of extensor carpi radialis muscle size, isometric force, relaxation rate and stamina during the breeding season of the frogRana temporariaLinnaeus 1758

Cited by 34 publications

References 24 publications

Plasticity of muscle function in a thermoregulating ectotherm (Crocodylus porosus): biomechanics and metabolism

Plasticity of muscle function in a thermoregulating ectotherm (Crocodylus porosus): biomechanics and metabolism

What factors contribute to an ownership advantage?

No sexual dimorphism in limb muscles of a frog not engaging in amplexus

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