Isometric patterns for male genital allometry in four damselfly species

Nava-Bolaños, Ángela; Sánchez-Guillén, Rosa Ana; Munguía‐Steyer, Roberto; Córdoba‐Aguilar, Alex

doi:10.1007/s10211-013-0153-5

Cited by 9 publications

(7 citation statements)

References 22 publications

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“…Two general patterns have emerged in the empirical literature with respect to allometry and phenotypic variation of genitalia. Vertebrate genitalia tend to show positive allometry and high variance (Kelly, Godin & Abdallah, ; Miller & Burton, ; Lupold, McElligott & Hosken, ; Kinahan et al ., ; Tasikas et al ., ; but see also Jennions & Kelly, ; Manjerovic et al ., ; Kinahan et al ., ; Ramm, Khoo & Stockley, ; Schulte‐Hostedde, Bowman & Middel, ), whereas arthropod genitalia tend to show negative allometry and low variance (Arnqvist & Thornhill, ; Eberhard et al ., ; Palestrini et al ., ; Tatsuta et al ., ; Bernstein & Bernstein, ; Hosken, Minder & Ward, ; Schulte‐Hostedde & Alarie, ; Bertin & Fairbairn, ; Fairn et al ., ; Nava Bolaños, Cordoba‐Aguilar & Munguia‐Steyer, ; Nava Bolaños et al ., ). The positive allometry of vertebrate genitalia is hypothesized to arise from directional sexual selection because females use baculum size as an index of male quality when they cannot assess male quality prior to copulation (Kinahan et al ., ; Tasikas et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…Two general patterns have emerged in the empirical literature with respect to allometry and phenotypic variation of genitalia. Vertebrate genitalia tend to show positive allometry and high variance (Kelly, Godin & Abdallah, 2000;Miller & Burton, 2001;Lupold, McElligott & Hosken, 2004;Kinahan et al, 2007;Tasikas et al, 2009; but see also Jennions & Kelly, 2002;Manjerovic et al, 2008;Kinahan et al, 2008;Ramm, Khoo & Stockley, 2010;Schulte-Hostedde, Bowman & Middel, 2011b), whereas arthropod genitalia tend to show negative allometry and low variance (Arnqvist & Thornhill, 1998;Eberhard et al, 1998;Palestrini et al, 2000;Tatsuta et al, 2001;Bernstein & Bernstein, 2002;Hosken, Minder & Ward, 2005;Schulte-Hostedde & Alarie, 2006;Bertin & Fairbairn, 2007;Fairn et al, 2007;Nava Bolaños, Cordoba-Aguilar & Munguia-Steyer, 2012;Nava Bolaños et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Sexual selection, phenotypic variation, and allometry in genitalic and non-genitalic traits in the sexually size-dimorphic stick insectMicrarchus hystriculeus

Kelly

2014

Biol J Linn Soc Lond

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The mobility hypothesis could explain the evolution of female‐biased size dimorphism if males with a smaller body size and longer legs have an advantage in scramble competition for mates. This hypothesis is tested by performing a selection analysis in the wild on Micrarchus hystriculeus (Westwood) (Phasmatodea), a sexually size dimorphic stick insect endemic to New Zealand. This analysis examined the form and strength of sexual selection on body size, leg lengths (front, mid and hind), and clasper size (a genitalic trait), and also quantified the degree of phenotypic variation and the allometric scaling pattern of these traits. By contrast to the mobility hypothesis, three lines of evidence were found to support significant stabilizing sexual selection on male hind leg length: a significant nonlinear selection gradient, negative static allometry, and a low degree of phenotypic variation. Hind leg length might be under stabilizing selection in males if having average‐sized legs facilitates female mounting or improves a male's ability to achieve the appropriate copulation position. As predicted, a negative allometric scaling pattern and low phenotypic variation of clasper size is suggestive of stabilizing selection and supports the ‘one‐size‐fits‐all’ hypothesis. Opposite to males, the mid and hind leg lengths of females showed positive static allometry. Relatively longer mid and hind leg lengths in larger females might benefit individuals via the better support of their larger abdomens. © 2014 The Linnean Society of London, Biological Journal of the Linnean Society, 2014, 113, 471–484.

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Section: Introductionmentioning

confidence: 97%

“…Two general patterns have emerged in the empirical literature with respect to allometry and phenotypic variation of genitalia. Vertebrate genitalia tend to show positive allometry and high variance (Kelly, Godin & Abdallah, 2000;Miller & Burton, 2001;Lupold, McElligott & Hosken, 2004;Kinahan et al, 2007;Tasikas et al, 2009; but see also Jennions & Kelly, 2002;Manjerovic et al, 2008;Kinahan et al, 2008;Ramm, Khoo & Stockley, 2010;Schulte-Hostedde, Bowman & Middel, 2011b), whereas arthropod genitalia tend to show negative allometry and low variance (Arnqvist & Thornhill, 1998;Eberhard et al, 1998;Palestrini et al, 2000;Tatsuta et al, 2001;Bernstein & Bernstein, 2002;Hosken, Minder & Ward, 2005;Schulte-Hostedde & Alarie, 2006;Bertin & Fairbairn, 2007;Fairn et al, 2007;Nava Bolaños, Cordoba-Aguilar & Munguia-Steyer, 2012;Nava Bolaños et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Sexual selection, phenotypic variation, and allometry in genitalic and non-genitalic traits in the sexually size-dimorphic stick insectMicrarchus hystriculeus

Kelly

2014

Biol J Linn Soc Lond

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“…Low allometric slopes for male genital structures therefore appear to be common among insects and spiders. However, some exceptions to this general pattern have also been observed (Johnson, ; Cayetano et al ., ; Nava‐Bolaños et al ., ). This suggests that genital traits may evolve via different kinds of selective pressures in different species, and perhaps within species.…”

Section: Introductionmentioning

confidence: 97%

“…Although Eberhard et al . () and Eberhard () found that female genitalia may show the same patterns of variation as male genitalia, previous studies that investigate the allometry relationships in insects have focused almost exclusively on males and set females aside (Palestrini et al ., ; Schmitz et al ., ; Tatsuta et al ., ; Bernstein & Bernstein, ; Eberhard, ; Ohno et al ., ; Mutanen & Kaitala, ; Mutanen et al ., ; Al‐Wathiqui & Rodriguez, ; Nava‐Bolaños et al ., ). Comparison of static allometries of male and female traits could be used to determine whether male genitalia are really distinctive from other types of traits in their shallow static allometries: if selection favours shallow allometry in male genitalia because of sexual selection, then female genitalic traits would not be expected to exhibit similarly shallow allometries.…”

Section: Introductionmentioning

confidence: 97%

Genital and body allometry in two species of noctuid moths (Lepidoptera: Noctuidae)

Rabieh

Esfandiari

Seraj

et al. 2015

Biol. J. Linn. Soc.

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One‐size‐fits‐all and related hypotheses predict that static allometry slopes for male genitalia will be consistently lower than 1.0 and lower than the slopes for most other body parts (somatic traits). We examined the allometry of genitalic and somatic morphological traits in males and females of two species of noctuid moths, Spodoptera exigua (Hübner, [1808]) and Helicoverpa armigera (Hübner, [1808]). The relationship between genitalic traits and body size was generally strongly negative‐allometric in males but with no significant differences from 1.00 in females of the two species examined. However, in females, the slope of genital traits was also lower than the slopes for somatic traits. The relationship between somatic traits and the body size indicator was approximately isometric in most cases in males, except in four traits in S. exigua, in which the slopes showed slight negative allometry, and the hind tibia in H. armigera, in which the slope had positive allometry. However, in females, some somatic traits showed isometric and some other showed negative allometry in both species. The coefficients of variation (CV) for all structures in the males were low, not exceeding 10%. Genitalic traits showed significantly lower CV than somatic traits in males. In females, somatic traits showed lower CV than genitalic traits but with no significant difference in the H. armigera. Our observations of strongly negative allometry for genitalic traits in males are consistent with stabilizing selection on genital size and we suggest that male performance in interactions with females is the source of selection on male genital allometry. The difference in the degree of phenotypic variation between genitalic and somatic traits in the two studied species is attributed to the different developmental‐genetic architectures of these traits. Female genitalia showed a similar trend to the males, although the difference between genital and somatic traits was not significant in females. This finding suggests that selection is acting differently on male and female genitalia. Positive allometry of hind tibia in H. armigera may be a result of secondary sexual function.

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“…1A and B ). Indeed, it is known that the conclusions of morphological studies can vary depending on which trait size is used as a body size indicator ( Nava-Bolaños et al 2014 ). However, which adult traits are an appropriate indicator of body size has not been verified for any species of stag beetle.…”

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confidence: 99%

Evaluation of Body Size Indicators for Morphological Analyses in Two Sister Species of Genus Dorcus (Coleoptera, Lucanidae)

Ohtsu

Chikami

Umino

et al. 2022

Journal of Insect Science

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The relationship between trait and body size, i.e., the scaling relationship or static allometry, is an essential concept for investigating trait size. However, usage of an inappropriate body size indicator can lead to misinterpretation of morphology. In this study, we examined several possible body size indicators in two closely related stag beetle species, Dorcus rectus and Dorcus amamianus. We raised animals in captivity and used pupal weight as a measure of true, or overall body size, and then evaluated six adult morphological traits to test whether these traits could be reliably used as body size indicators in static scaling relationship comparisons. We analyzed two comparisons, between sexes in same species and between species in same sex. We showed that the most appropriate body size indicators differ depending on the comparisons. Our results indicated that the scaling relationship of focal traits could be over- or under-estimated depending on which body size indicators are used.

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Isometric patterns for male genital allometry in four damselfly species

Cited by 9 publications

References 22 publications

Sexual selection, phenotypic variation, and allometry in genitalic and non-genitalic traits in the sexually size-dimorphic stick insectMicrarchus hystriculeus

Sexual selection, phenotypic variation, and allometry in genitalic and non-genitalic traits in the sexually size-dimorphic stick insectMicrarchus hystriculeus

Genital and body allometry in two species of noctuid moths (Lepidoptera: Noctuidae)

Evaluation of Body Size Indicators for Morphological Analyses in Two Sister Species of Genus Dorcus (Coleoptera, Lucanidae)

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