Morphological, acoustic and genetic divergence in the bladder grasshopper<i>Bullacris unicolor</i>

Sathyan, Rekha; Engelbrecht, Adriaan; Couldridge, Vanessa

doi:10.1080/03949370.2017.1287915

Cited by 12 publications

(17 citation statements)

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“…In this study, we assess the potential role of geography, environment (specifically climate) and female preference in modelling spatial patterns of genetic and phenotypic (morphological and acoustic) divergence in Chorthippus cazurroi (Bolívar, 1898), an annual alpine grasshopper endemic to the Cantabrian Mountains, north‐western Spain. Previous studies have shown that isolation and habitat determined genetic and phenotypic differentiation in grasshoppers (Hernández‐Teixidor et al., ; Noguerales, Cordero, & Ortego, ; Ortego, Aguirre, & Cordero, ; Sathyan, Engelbrecht, & Couldridge, ). Orthopterans represent also an ideal model to address sexual selection issues (Greenfield, ; Robinson & Hall, ), since female uses male song and morphology both for species recognition and selection between conspecific males (Klappert & Reinhold, ; Saldamando et al., ).…”

Section: Introductionmentioning

confidence: 98%

“…In this study, we assess the potential role of geography, environment (specifically climate) and female preference in modelling spatial patterns of genetic and phenotypic (morphological and acoustic) divergence in Chorthippus cazurroi (Bolívar, 1898), an annual alpine grasshopper endemic to the Cantabrian Mountains, north-western Spain. Previous studies have shown that isolation and habitat determined genetic and phenotypic differentiation in grasshoppers (Hernández-Teixidor et al, 2014;Noguerales, Cordero, & Ortego, 2016;Ortego, Aguirre, & Cordero, 2012;Sathyan, Engelbrecht, & Couldridge, 2017).…”

Section: Introductionmentioning

confidence: 99%

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The roles of geography, climate and sexual selection in driving divergence among insect populations on mountaintops

Pato

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Obeso

et al. 2019

Journal of Biogeography

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Aim Analysing the drivers of intraspecific variation and how reproductive barriers arise is an essential step to infer the mechanisms of biogeographic differentiation. In populations of a specialized alpine species, we explore the role of geography and climate in the divergence of genetic, morphological and acoustic characters, and analyse the functional consequences of variation on mate choice. Taxon Chorthippus cazurroi (Orthoptera: Caelifera, Acrididae, Gomphocerinae). Location The entire distribution of the species (23 populations from six massifs of the Cantabrian Mountains, NW Spain). Methods First, we analysed the extent of intraspecific spatial divergence and the covariation among climatic niche, genetic (mtDNA), acoustic (song structure) and morphological (body size) traits. Then, we analysed the consequences of phenotypic variation by means of a crossing experiment among populations from different elevations. This served to test for differences in sexual selection among body size‐divergent populations and for the relationship between male traits, female preference and reproduction. Results Genetic, morphologic and acoustic divergence increased with geographic distance. Female morphology was also affected by climate variation, while male one tightly covaried with the song differentiation. Females more closely approached males investing more time in song activities, but weakly responded to the rest of acoustic features and morphological variation. They also distanced themselves slightly more from males from different populations, although this behaviour did not lead to clear differences in reproductive parameters. Main conclusions The process of colonization of mountain massifs has led to significant genetic and phenotypic changes in C. cazurroi. Phenotypic divergence does not constitute a strong intrinsic barrier to reproduction and is largely unpaired from female preference, overall suggesting that sexual selection is a minor actor in the process of differentiation as compared, for instance, to drift. This does not exclude that traits associated with individual condition are under strong selection and, therefore, do not vary so extensively. This study dismisses the idea that alpine specialists with narrow distributions lack genetic and phenotypic variability, and highlights the importance of synthesizing biogeographic and experimental approaches to obtain stronger and deeper inferences about the dynamics and mechanisms of biological differentiation.

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Section: Introductionmentioning

confidence: 98%

“…In this study, we assess the potential role of geography, environment (specifically climate) and female preference in modelling spatial patterns of genetic and phenotypic (morphological and acoustic) divergence in Chorthippus cazurroi (Bolívar, 1898), an annual alpine grasshopper endemic to the Cantabrian Mountains, north-western Spain. Previous studies have shown that isolation and habitat determined genetic and phenotypic differentiation in grasshoppers (Hernández-Teixidor et al, 2014;Noguerales, Cordero, & Ortego, 2016;Ortego, Aguirre, & Cordero, 2012;Sathyan, Engelbrecht, & Couldridge, 2017).…”

Section: Introductionmentioning

confidence: 99%

The roles of geography, climate and sexual selection in driving divergence among insect populations on mountaintops

Pato

Illera

Obeso

et al. 2019

Journal of Biogeography

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“…Sex differences in vocalization are common in many vocal animals (Sathyan et al, 2017;Ammie, 2019;Buck et al, 2020) and may be related to differences in the size of vocal organs (Pellitteri, 2003;Galeotti et al, 2005), intraspecific competition, and mate selection pressure (Garcia et al, 2013;Zhu et al, 2017). This sex difference in turtle vocalization provides a foundation for understanding sexual selection in voice communication.…”

Section: Introductionmentioning

confidence: 99%

Underwater vocalizations of Trachemys scripta elegans and their differences among sex–age groups

Zhao

et al. 2022

Front. Ecol. Evol.

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The aim of this study was to identify underwater vocalizations in red-eared turtles (Trachemys scripta elegans) and assess differences between sexes and ages. We recorded the underwater vocalizations of the red-eared sliders and identified 12 call types through manual visual and aural inspection of the recordings. Similarity analysis verified that manual classification was relatively reliable. The call types of the turtle were described and displayed as spectrograms and waveforms. The turtles produced fewer high-frequency call types than low-frequency types in all recordings. Statistical analysis revealed significant differences in the frequencies and duration of the calls of red-eared turtles between different sexes and ages. Males vocalized pulse calls very frequently, whereas a high proportion of high-frequency call types was emitted by the female adult group. The male subadult group emitted higher frequencies of Type A, B, and C calls, which is in accordance with the phenomenon that vocal frequency is often inversely proportional to the turtle size. Some call types produced by red-eared turtles were above the frequency range of their known hearing range. This may have been a by-product of the sound production mechanism or it may have adaptive value in mitigating interference to communication from low-frequency noise common in natural waters in communication The behavioral implications of these vocalizations and whether turtles can hear such high sounds warrant further study.

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“…They rely heavily on cryptic camouflage to avoid predation, with individuals being extremely well matched in terms of colour pattern to their specific host plant. Preliminary investigations have shown significant geographic variation in the morphology of males within and between populations (Sathyan et al 2017), and that these differences appear to be fixed rather than plastic. All Bullacris species are specialized to feed on a small number of host plant species and many of the host plants used by Bullacris unicolor (Linnaeus, 1758) occur sympatrically (personal observation).…”

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confidence: 99%

“…A series of seven linear measurements (mm), which included antennal length, body length, head width, abdomen width, femur length, tibia length and pronotum length were recorded for each ethanol preserved specimen following Donelson (2007) and Sathyan et al (2017). We used multivariate analysis of variance (MANOVA) to compare the variation in male and female morphological characters within the population.…”

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confidence: 99%

No evidence for host plant associated genetic divergence in a population of Bullacris unicolor (Linnaeus, 1758) (Orthoptera: Pneumoridae)

2022

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Host-associated genetic differentiation in grasshoppers has received limited attention, due to a lack of information on grasshopper-plant associations. The bladder grasshopper, Bullacris unicolor (Linnaeus, 1758) (Orthoptera: Pneumoridae), is a phytophagous species that can occur on at least six host plants within its geographic range. However, the relationship between host plant association and genetic variation of bladder grasshoppers has not been studied before. In light of this, the present study examined host plant-related genetic [mitochondrial cytochrome oxidase 1 (CO1) and the internal transcribed spacer (ITS) gene regions] and morphological (antennal length, body length, head width, abdomen width, femur length, tibia length and pronotum length) divergence within a population of B. unicolor. We used two plant species, belonging to different families, namely Didelta spinosa (L.fil.) Aiton (Asteraceae) and Roepera morgsana (L.) Beier & Thulin (Zygophyllaceae), to evaluate variation between individuals collected on these two sympatric host plants at a single locality in the Northern Cape, South Africa. The results demonstrated non-significant host related genetic variation with very low values of FST, indicating a low level of variation. The phylogram strongly indicated that there are no host-associated genetic differences in B. unicolor by displaying limited genomic clustering, whereas some differentiation was observed between the morphological measurements of males and females among host plants. Further studies using microsatellite molecular markers may help to discern population genetic structure. In addition, significant host-associated morphological divergence highlights the need to examine the mechanisms by which host utilization affects morphological features.

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Morphological, acoustic and genetic divergence in the bladder grasshopperBullacris unicolor

Cited by 12 publications

References 64 publications

The roles of geography, climate and sexual selection in driving divergence among insect populations on mountaintops

The roles of geography, climate and sexual selection in driving divergence among insect populations on mountaintops

Underwater vocalizations of Trachemys scripta elegans and their differences among sex–age groups

No evidence for host plant associated genetic divergence in a population of Bullacris unicolor (Linnaeus, 1758) (Orthoptera: Pneumoridae)

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