Ancestral sex-role plasticity facilitates the evolution of same-sex sexual behaviour

Mizumoto, Nobuaki; Bourguignon, Thomas; Bailey, Nathan W.

doi:10.1101/2022.06.20.496918

Cited by 5 publications

(6 citation statements)

References 47 publications

(72 reference statements)

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“…Most tracking software recognizes a tandem pair as a single individual and fails to distinguish partners from each other. The coordinates of tandem partners can be well extracted using UMATracker software (Yamanaka and Takeuchi, 2018), as evidenced by previous studies (Mizumoto et al, 2022(Mizumoto et al, , 2021(Mizumoto et al, , 2020Mizumoto and 10 Dobata, 2019;Valentini et al, 2020b). One of the prerequisites of the UMATracker is a fixed number of individuals in a video frame.…”

Section: Tandem Trajectory Datasetmentioning

confidence: 91%

“…Most tracking software recognizes a tandem pair as a single individual and fails to distinguish partners from each other. The coordinates of tandem partners can be well extracted using UMATracker software (Yamanaka and Takeuchi, 2018), as evidenced by previous studies (Mizumoto et al, 2022(Mizumoto et al, , 2021(Mizumoto et al, , 2020 . CC-BY-NC-ND 4.0 International license made available under a (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.…”

Section: Tandem Trajectory Datasetmentioning

confidence: 91%

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Cryptic functional diversity in ant tandem runs

Mizumoto

Tanaka

Valentini

et al. 2022

Preprint

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Ants have evolved diverse recruitment methods to guide colony members to valuable resources, such as food or nest sites. One of these methods, tandem running, consists of an informed leader directly guiding a naive follower every step of the way from nest to resource. Although this behavior appears superficially similar in the different ant taxa in which it has independently evolved, this similarity could conceal underlying functional and mechanistic differences. Here we present a combined network and information-theoretic analysis, which reveals fundamental differences in the tandem recruitment between two distantly related ant genera, Temnothorax and Diacamma. Temnothorax uses tandem running to recruit additional recruiters, whereas Diacamma uses it principally to move the passive majority of the colony, a task that Temnothorax accomplishes with a different behavior, social carrying. Accordingly, the structure of the tandem run recruitment networks of Diacamma was different from those of Temnothorax, with Diacamma networks more closely resembling the social carrying networks of Temnothorax. Furthermore, an information-theoretic analysis of the spatial trajectories of leaders and followers revealed that Diacamma tandem runs lack bidirectional information flow, the signature of route-learning in Temnothorax tandem runs. These results suggest that Diacamma uses tandem runs not to share information, but to transport nestmates. By quantifying the cryptic diversity of communication behavior, this study increases the resolution of our understanding of animal societies.

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Section: Tandem Trajectory Datasetmentioning

confidence: 91%

“…Most tracking software recognizes a tandem pair as a single individual and fails to distinguish partners from each other. The coordinates of tandem partners can be well extracted using UMATracker software (Yamanaka and Takeuchi, 2018), as evidenced by previous studies (Mizumoto et al, 2022(Mizumoto et al, , 2021(Mizumoto et al, , 2020 . CC-BY-NC-ND 4.0 International license made available under a (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.…”

Section: Tandem Trajectory Datasetmentioning

confidence: 91%

Cryptic functional diversity in ant tandem runs

Mizumoto

Tanaka

Valentini

et al. 2022

Preprint

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“…Upon encountering an individual of the opposite sex, females and males engage in a tandem run, with one following the other (Nutting, 1969). This tandem running behaviour can be observed in 64 species among 72 species of termites with records, and the leaderfollower role is fixed in Neoisoptera, with females being leaders and males being followers (Mizumoto et al, 2022). During tandem runs, interactions are unidirectional: females decide the speed and course of movements and males follow (Valentini et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Light alters activity but does not disturb tandem coordination of termite mating pairs

Mizumoto

Bourguignon

2022

Ecological Entomology

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Group-living animals coordinate their movements via local interactions, which can be mediated by visual, tactile, and chemical communication channels. Termite mating pairs form tandems with one male imago following one female imago in a synchronised way to explore the environment and search for a nesting site. Imagoes are the only developmental stage with compound eyes in termites, but the role of vision during tandem runs remains unknown. Here, we investigate the movements during tandem runs of two termite species, Coptotermes formosanus, which swarms during the night, and Reticulitermes speratus, which swarms during the day. We performed the experiments with light and in complete darkness. We found that females and males of both species adjust their speed to each other to form a stable tandem and reunite efficiently upon separation, with or without light. However, the activity was dependent on light conditions in the diurnal R. speratus, in which termites were more active with light. On the other hand, the nocturnal C. formosanus was mostly insensitive to light environments, with termites being slightly more active in darkness. Our results suggest that termites can use light as an environmental cue to start forming mating pairs but not as means to locate mates or coordinate their movements.

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“…Same-sex pairing behaviors have been attributed to errors in sexual recognition ( Burgevin et al 2013 , Scharf and Martin 2013 ), but this is unable to explain same-sex pairing in termites ( Mizumoto et al 2016 , 2022 ). Mixed-sex pairs run in tandem to find a suitable nest site, and the male will follow the female when they encounter each other.…”

mentioning

confidence: 99%

“…Two individuals of same-sex pairs in tandem often try to follow each other to form circles, because the individual at the back of a male–male tandem is likely to win a female if and when encountering one ( Li et al 2015 ). This behavior may even result in a switch of leader–follower positions ( Mizumoto et al 2022 ).…”

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confidence: 99%

Same-sex Pairs Retain Their Reproductive Capacity as a Potential Opportunity for Individual Reproductive Success in Termites

Wang

et al. 2023

Journal of Insect Science

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In eusocial termites, successful pairing is an essential element of dispersal and distribution after the departure of alates from natal colonies. Two situations could arise during the pairing process: mixed-sex pairs and same-sex pairs. However, most previous studies focused on mixed-sex pairs, overlooking groups formed by same-sex pairings, especially potential fecundity (the total number of oocytes or ovarioles), oogenesis and the development stage of oocytes of females in female–female pairs, and spermatogenesis and testis development of males in male–male pairs. In this study, through experimentation, we investigated the reproductive ability of virgin dealates based on various pairing types as mentioned above. We found that the life spans of virgin dealates can cover 1 yr or even more when they establish a nest with a partner, which is more than 10-fold longer than the life span of individuals establishing a colony alone. After 1 yr of pairing, the potential fecundity of virgin same sex dealates did not degenerate significantly compared with newly emerged dealates, including the number of ovarioles, size of testis, oogenesis, and the development stage of the oocytes. Moreover, when individuals of same-sex pairings experimentally changed into mixed-sex pairs after 1 yr, the eggs produced in the colony hatched into larvae. These findings suggest that dealates which through same-sex pairs retain fecundity after 1 yr have more reproductive potential than dealates that failed to pair with heterosexuals, shedding light on the ecological significance of homosexual behaviors in terms of the successful extension and fecundity of eusocial termites.

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Ancestral sex-role plasticity facilitates the evolution of same-sex sexual behaviour

Cited by 5 publications

References 47 publications

Cryptic functional diversity in ant tandem runs

Cryptic functional diversity in ant tandem runs

Light alters activity but does not disturb tandem coordination of termite mating pairs

Same-sex Pairs Retain Their Reproductive Capacity as a Potential Opportunity for Individual Reproductive Success in Termites

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