Mate-guarding behaviour in anurans: intrasexual selection and the evolution of prolonged amplexus in the harlequin toad Atelopus laetissimus

Rueda‐Solano, Luis Alberto; Vargas‐Salinas, Fernando; Pérez-González, José Luis; Sánchez-Ferreira, Arantxa; Guerra, Alejandro Ramírez; Navas, Carlos A.; Crawford, Andrew J.

doi:10.1016/j.anbehav.2021.12.003

Cited by 5 publications

(3 citation statements)

References 63 publications

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“…Clasping time is a classic indicator of sexual conflict found in myriad arthropod and vertebrate systems (Arnqvist & Rowe 2005; Johns et al 2009; Rueda-Solano et al 2022; Sigvardt et al 2017). Indeed, males of some species, including those in this study, are entirely unable to ensure copulation when unable to clasp the female, providing significant motivation for unreceptive females to prevent clasping (Machado & Macías-Ordόñez et al 2007; Myers et al 2016).…”

Section: Discussionmentioning

confidence: 99%

The loss of nuptial gifts in sclerosomatid Opiliones coincides with increased behavioural sexual conflict

Brown,

Marinko,

Burns

2024

Preprint

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Nuptial gifts serve to increase donor fitness through a variety of pathways independent of their effect on the recipient. Some nuptial gifts deliver benefits similar to those of antagonistic male behaviours: functioning to secure additional copulations, increase sperm transfer or storage, or increase paternity share. These commonalities may result in evolutionary transitions between solicitous and coercive strategies, wherein behavioural sexual conflict could function to secure mates in lieu of nuptial gifts. In temperate leiobunine harvesters (Arachnida: Opiliones), nuptial gifts have been repeatedly lost, resulting in two primary mating syndromes: an ancestral, sacculate state in which males endogenously produce high-investment nuptial gifts and females lack pregenital barriers, and a derived, nonsacculate state in which females have pregenital barriers and males produce significantly reduced, low-investment nuptial gifts. In this study, we investigated whether behavioural sexual conflict compensates for reduced nuptial gifts in nonsacculate harvesters by comparing the intensity of pre-, peri-, and postcopulatory behavioural sexual conflict between the nonsacculate speciesLeiobunum vittatumandL. euserratipalpeand the sacculate speciesL. aldrichiandL. bracchiolum. We additionally sought to establish an automated behavioural analysis pipeline by developing analogues for metrics traditionally scored manually. Our results revealed significantly higher sexual conflict behaviour in nonsacculate species, indicating that the loss and reduction of pre- and pericopulatory nuptial gifts may contribute to increased behavioural antagonism. Sexual conflict behaviour also differed significantly betweenL. vittatumandL. euserratipalpe, indicating there are multiple suites of antagonistic behaviours. Together, these results suggest that multiple behavioural strategies may be effective substitutes for nuptial gifts in leiobunine Opiliones, although the mechanisms through which male fitness is increased requires further research.HighlightsTemperate Opiliones have repeatedly evolved reduced nuptial gift investmentReduced-gift (nonsacculate) species possess morphology indicative of antagonismWe tested whether sexual conflict is higher in nonsacculate versus sacculate speciesNonsacculates displayed significantly higher behavioural antagonism than sacculatesNonsacculate species differed in their suites of antagonistic behaviours

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Section: Discussionmentioning

confidence: 99%

The loss of nuptial gifts in sclerosomatid Opiliones coincides with increased behavioural sexual conflict

Brown,

Marinko,

Burns

2024

Preprint

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“…In addition to comparing the von Mises stress in each model in their long‐axis loading scenario, we also performed two further rounds of analyses that simulated the force vectors acting on the radioulna during landing (Figure S2 k–l) and amplexus (Figure S3 k–l). We retained the same vector magnitude (36 N) for all tests for the sake of comparison (although 36 N may not be an unreasonable estimate for amplexus forces in frogs; see Rueda‐Solano et al, 2022 ). For the direction of our landing vector, we generated a landing force vector based on angle measurements from previous work measuring the GRF of ranids (Nauwelaerts & Aerts, 2006 ; Reilly et al, 2016 ) as well as XROMM video data of R. catesbeiana jumping (R. Keeffe, unpublished data).…”

Section: Methodsmentioning

confidence: 99%

“…We retained the same vector magnitude (36 N) for all tests for the sake of comparison (although 36 N may not be an unreasonable estimate for amplexus forces in frogs; see Rueda-Solano et al, 2022).…”

Section: Finite Element Analysismentioning

confidence: 99%

Diversity and function of the fused anuran radioulna

Keeffe

Blackburn

2022

Journal of Anatomy

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Many clades of vertebrates exhibit fusion between elements of the appendicular skeleton. Well-known examples are found in the limbs of modern birds and mammals. These include the tibiotarsus, tarsometatarsus, and carpometacarpus bones in birds, the fused radius and ulna in bats, horses, and artiodactyls (Figure 1d), and the fused tibia and fibula in hedgehogs, sea-lions, coneys, rodents, rabbits, armadillos, aardvarks, and tarsiers (Barnett & Napier, 1953;Sahd et al., 2019;Salami et al., 2011). In extant frogs, the tibia and fibula as well as the radius and ulna are always completely fused in adults (Duellman & Trueb, 1986) and the proximal tarsal bones are fused in some or all species in several families (Centrolenidae, Microhylidae,

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Developments in the study of poison frog evolutionary ecology I: social interactions, life history and habitat use across space and ontogeny

Vargas-Salinas,

Rojas

2024

Evol Ecol

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Mate-guarding behaviour in anurans: intrasexual selection and the evolution of prolonged amplexus in the harlequin toad Atelopus laetissimus

Cited by 5 publications

References 63 publications

The loss of nuptial gifts in sclerosomatid Opiliones coincides with increased behavioural sexual conflict

The loss of nuptial gifts in sclerosomatid Opiliones coincides with increased behavioural sexual conflict

Diversity and function of the fused anuran radioulna

Developments in the study of poison frog evolutionary ecology I: social interactions, life history and habitat use across space and ontogeny

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