Physiological condition and wing pigmentation expression in a damselfly with seasonal polyphenism

Castaños, Clara E.; Córdoba‐Aguilar, Alex; Munguía‐Steyer, Roberto

doi:10.1111/phen.12203

Cited by 7 publications

(6 citation statements)

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“…). In general, summer individuals contain more resources that are allocated to reproduction and parental care activities (Wolda, ; Castaños et al, ). Although our species reproduces all year long, there is a correlation between season and egg‐pad size, with males carrying more eggs during the summer, probably because females show a higher fecundity as a result of the availability of food resources.…”

Section: Discussionmentioning

confidence: 99%

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Costly parenting: physiological condition over time and season in males of the giant waterbug Abedus dilatatus

et al. 2019

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Parental care patterns increase offspring fitness but may drive energetic costs to parents. The costs associated with parental care can change over time, decreasing the condition of parents that experience prolonged parental care. Thus, males can modulate parental effort based in the relative fitness cost/benefit pay-offs under different stages and environmental conditions. The present study assesses the condition of parental males of Abedus dilatatus Say by measuring their lipid, glycogen and carbohydrate contents. We compare the condition in parental males that have experienced recent and prolonged care and that were also collected in the summer and winter. Waterbug males provide parental care via carrying and ventilating eggs on their back. Winter males are smaller and carry fewer eggs compared with summer males. Males with recent care and carrying more eggs present a more lipid content. However, at the end of care, males carrying more eggs present less lipids than males with smaller egg-pads. Additionally, we find that males collected in the summer present more carbohydrates than males in the winter. Moreover, larger males with prolonged care present less carbohydrates than smaller males, in contrast to males with recent care where there is a positive relationship between size and carbohydrate content. Our results suggest that parental care in A. dilatatus may be a sexually-selected trait, as has been found in related species, and further experiments could test this idea. This is the first study to provide evidence of physiological costs related to exclusive paternal care in arthropods.

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Section: Discussionmentioning

confidence: 99%

“…(). In brief, this procedure uses sequential solvents to assess energy reserves via colourimetric techniques that estimate the quantity of energy reserves in each individual (Foray et al ., ; Castaños et al ., ).…”

Section: Methodsmentioning

confidence: 97%

Costly parenting: physiological condition over time and season in males of the giant waterbug Abedus dilatatus

et al. 2019

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“…In different orders of flying insects, it is known that the muscles used during flight use carbohydrates as the primary energy source (Suarez et al., 2005). Even a negative relationship has been found between the carbohydrate content and the size of the forewings of male damselfly Hetaerina titia (Castaños et al., 2017). In A. ovatus , the ventilation behaviors (brood pumping) necessary for the oxygenation and development of the eggs carried out by the males require intense muscular activity.…”

Section: Discussionmentioning

confidence: 99%

“…between the carbohydrate content and the size of the forewings of male damselfly Hetaerina titia (Castaños et al, 2017). In A. ovatus, the ventilation behaviors (brood pumping) necessary for the oxygenation and development of the eggs carried out by the males require intense muscular activity.…”

Section: Interceptmentioning

confidence: 99%

Juvenile hormone and temperature effects in the postzygotic parental investment of male waterbug Abedus ovatus (Belostomatidae)

Argaez,

Munguía‐Steyer

2024

Ethology

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Parental investment is any expenditure of time or energy by parents that increases their offspring survival at the cost of future reproduction. The costs associated with parental investment can be reflected in a deterioration of their physiological condition. In insects, juvenile hormone has been identified as having a role in the control of parental care. However, its effects on parental investment remain unclear for many taxa, especially in species with exclusive paternal care. We evaluated whether juvenile hormone influences postzygotic parental investment in Abedus ovatus, a waterbug with exclusive paternal care. Males provide parental care by carrying eggs on their backs and ventilating them by generating water currents through push‐ups called brood pumping. In an experiment, we applied methoprene (an analog of juvenile hormone) to males at early and late parental care stages and quantified the frequency of brood pumping and the contents of energy reserves (lipids, carbohydrates, and glycogen) at the end of parental care as a measure of physiological condition. We found that methoprene increases the frequency of brood pumping only when the water temperature increases. However, there was no correlation between the parent's energy reserves and methoprene treatments. We found that males who cared for large egg pads had lower amounts of lipids and carbohydrates at the end of parental care, and both effects are greater as the water temperature increases. These results suggest that energy expenditure during parental care is high due to intense muscular activity during brood pumping, which depletes male energy reserves and could affect future reproduction.

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“…This could for instance occur when the expression of sexually selected traits is condition dependent, as many genes throughout the genome are assumed to underlie resource acquisition, processing, and allocation (Rowe & Houle, 1996). Notable examples of condition‐dependent traits under sexual selection include the length of male eye span in stalk‐eyed flies (Cotton et al, 2004; David et al, 1998; Knell et al, 1999) or the amount of wing pigmentation in male damselflies (Castaños et al, 2017; Contreras‐Garduno et al, 2008; Hooper et al, 1999; Siva‐Jothy, 2000; Suhonen et al, 2018). Sexual selection acting in males is then expected to make overall selection on sexually concordant genetic variation stronger in males than in females (Figure 1a), thereby increasing selection against genome‐wide deleterious mutations while sparing females from the demographic costs of selection (Whitlock & Agrawal, 2009).…”

Section: Introductionmentioning

confidence: 99%

Environmental variance in male mating success modulates the positive versus negative impacts of sexual selection on genetic load

Tschol

Reid

Bocedi

2023

Journal of Evolutionary Biology

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Sexual selection on males is predicted to increase population fitness, and delay population extinction, when mating success negatively covaries with genetic load across individuals. However, such benefits of sexual selection could be counteracted by simultaneous increases in genome‐wide drift resulting from reduced effective population size caused by increased variance in fitness. Resulting fixation of deleterious mutations could be greatest in small populations, and when environmental variation in mating traits partially decouples sexual selection from underlying genetic variation. The net consequences of sexual selection for genetic load and population persistence are therefore likely to be context dependent, but such variation has not been examined. We use a genetically explicit individual‐based model to show that weak sexual selection can increase population persistence time compared to random mating. However, for stronger sexual selection such positive effects can be overturned by the detrimental effects of increased genome‐wide drift. Furthermore, the relative strengths of mutation‐purging and drift critically depend on the environmental variance in the male mating trait. Specifically, increasing environmental variance caused stronger sexual selection to elevate deleterious mutation fixation rate and mean selection coefficient, driving rapid accumulation of drift load and decreasing population persistence times. These results highlight an intricate balance between conflicting positive and negative consequences of sexual selection on genetic load, even in the absence of sexually antagonistic selection. They imply that environmental variances in key mating traits, and intrinsic genetic drift, should be properly factored into future theoretical and empirical studies of the evolution of population fitness under sexual selection.

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Physiological condition and wing pigmentation expression in a damselfly with seasonal polyphenism

Cited by 7 publications

References 76 publications

Costly parenting: physiological condition over time and season in males of the giant waterbug Abedus dilatatus

Costly parenting: physiological condition over time and season in males of the giant waterbug Abedus dilatatus

Juvenile hormone and temperature effects in the postzygotic parental investment of male waterbug Abedus ovatus (Belostomatidae)

Environmental variance in male mating success modulates the positive versus negative impacts of sexual selection on genetic load

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