Mechanical and tactile incompatibilities cause reproductive isolation between two young damselfly species

Barnard, Alexandra A.; Fincke, Ola M.; McPeek, Mark A.; Masly, John P.

doi:10.1101/142828

Cited by 16 publications

(46 citation statements)

References 104 publications

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“…This study indicated that a combination of barriers led to reproductive isolation between all four species, due to the joint action of visual, mechanical, and tactile isolation (more than 90% of the isolation was due to visual isolation) (Nava‐Bolaños et al ., ). This could be explained by the fact the prezygotic barriers could be reinforced in sympatry (Barnard et al ., ; Sánchez‐Guillen et al ., ) . Regarding our current predictive model, this suggests that the species combinations between A. extranea , A. oenea , and A. tezpi are likely to produce hybrids based on genetic divergence whereas the three species combinations including A. anceps are not prone to hybridise.…”

Section: Discussionmentioning

confidence: 99%

Predicting hybridisation as a consequence of climate change in damselflies

Nava-Bolaños

Sánchez-Guillén

Wellenreuther

et al. 2019

Insect Conserv Diversity

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Climate change is a key stressor for species. Two major consequences of climate‐induced range shifts are the formation of new areas of geographic overlap (i.e. sympatry) and an increased probability of hybridisation in the de novo created contact zones. One method to effectively quantify the potential of hybridisation is to integrate ecological niche modelling and the propensity to hybridisation based on genetic divergence. In this paper, we have applied this methodology to predict hybridisation outcomes following different scenarios of climate change in 30 species of Argia damselflies. We (i) investigated how climate change may affect species’ distributions; (ii) quantified if changed distributions generate new areas of sympatry between species; (iii) calculated the propensity to hybridise based on genetic divergence between species; and (iv) integrated these data to predict the future potential of species to hybridise. We found that the distribution of 29 of the 30 species was affected by a change in climate which led to a general increase in sympatric overlap among species. The degree of genetic divergence among the 108 species’ combinations ranged from 0.06% to 0.36%. Based on the sympatric overlap and genetic divergence, it can be predicted that 97 of the species pairs are likely to hybridise in the future. Our results are useful to forecast how highly diverse and closely related groups, such as Argia damselflies, may respond to a change in climate and how this can impact the potential of species mixing under a scenario of increased global warming.

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Section: Discussionmentioning

confidence: 99%

Predicting hybridisation as a consequence of climate change in damselflies

Nava-Bolaños

Sánchez-Guillén

Wellenreuther

et al. 2019

Insect Conserv Diversity

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“…We do this by examining individually the three different mechanisms of sexual selection that are candidate drivers of female genital diversity (Table ). As with many other contributions to the field, we define genitalia to include secondary genital structures that make contact between males and females during copulation, but need not necessarily be intromittent organs (Barnard, Fincke, McPeek, & Masly, ; Brennan et al., ; Eberhard, ; Simmons, ). In reviewing this literature, we not only gain a better understanding of the relative importance of different mechanisms of sexual selection for the evolution of female genitalia, but also reveal areas of focus for future research.…”

Section: Introductionmentioning

confidence: 99%

The evolution of female genitalia

Sloan

Simmons

2019

J of Evolutionary Biology

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Female genitalia have been largely neglected in studies of genital evolution, perhaps due to the long‐standing belief that they are relatively invariable and therefore taxonomically and evolutionarily uninformative in comparison with male genitalia. Contemporary studies of genital evolution have begun to dispute this view, and to demonstrate that female genitalia can be highly diverse and covary with the genitalia of males. Here, we examine evidence for three mechanisms of genital evolution in females: species isolating ‘lock‐and‐key’ evolution, cryptic female choice and sexual conflict. Lock‐and‐key genital evolution has been thought to be relatively unimportant; however, we present cases that show how species isolation may well play a role in the evolution of female genitalia. Much support for female genital evolution via sexual conflict comes from studies of both invertebrate and vertebrate species; however, the effects of sexual conflict can be difficult to distinguish from models of cryptic female choice that focus on putative benefits of choice for females. We offer potential solutions to alleviate this issue. Finally, we offer directions for future studies in order to expand and refine our knowledge surrounding female genital evolution.

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“…The North American damselfly genus Enallagma includes several recently diverged species that often co‐occur in the same habitats (Johnson & Crowley, ; McPeek, ), and do not engage in premating courtship (Barnard et al, ; Fincke, Fargevieille, & Schultz, ) or use chemical cues for mate selection (Rebora et al, ). A female's first opportunity to assess a potential mate occurs when the male uses his terminal appendages to grasp the mesostigmal plates on the female thorax to form “tandem,” the premating position.…”

Section: Introductionmentioning

confidence: 99%

Divergence in female damselfly sensory structures is consistent with a species recognition function but shows no evidence of reproductive character displacement

Barnard

Masly

2018

Ecology and Evolution

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Males and females transmit and receive signals prior to mating that convey information such as sex, species identity, or individual condition. In some animals, tactile signals relayed during physical contact between males and females before and during mating appear to be important for mate choice or reproductive isolation. This is common among odonates, when a male grasps a female's thorax with his terminal appendages prior to copulation, and the female subsequently controls whether copulation occurs by bending her abdomen to complete intromission. It has been hypothesized that mechanosensory sensilla on the female thoracic plates mediate mating decisions, but is has been difficult to test this idea. Here, we use North American damselflies in the genus Enallagma (Odonata: Coenagrionidae) to test the hypothesis that variation in female sensilla traits is important for species recognition. Enallagma anna and E. carunculatum hybridize in nature, but experience strong reproductive isolation as a consequence of divergence in male terminal appendage morphology. We quantified several mechanosensory sensilla phenotypes on the female thorax among multiple populations of both species and compared divergence in these traits in sympatry versus allopatry. Although these species differed in features of sensilla distribution within the thoracic plates, we found no strong evidence of reproductive character displacement among the sensilla traits we measured in regions of sympatry. Our results suggest that species‐specific placement of female mechanoreceptors may be sufficient for species recognition, although other female sensory phenotypes might have diverged in sympatry to reduce interspecific hybridization.

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Mechanical and tactile incompatibilities cause reproductive isolation between two young damselfly species

Cited by 16 publications

References 104 publications

Predicting hybridisation as a consequence of climate change in damselflies

Predicting hybridisation as a consequence of climate change in damselflies

The evolution of female genitalia

Divergence in female damselfly sensory structures is consistent with a species recognition function but shows no evidence of reproductive character displacement

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