Polyploidy alters advertisement call structure in gray treefrogs

Keller, Michael J.; Gerhardt, H. Carl

doi:10.1098/rspb.2000.1391

Cited by 50 publications

(66 citation statements)

References 33 publications

(41 reference statements)

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“…Moreover, a previous study of artificially produced autotriploids of the diploid species in this complex (Hyla chrysoscelis; 2n ¼ 24) found that the pulse rate of their calls shifted in the direction of the lower values of the tetraploid species (Hyla versicolor; 4n ¼ 48) [11]. This result and a comparable study [12] of a Japanese tree frog (Hyla japonica) provide unequivocal evidence that polyploidy per se can affect behaviourally significant call properties.…”

Section: Introductionsupporting

confidence: 71%

“…Although the difference in pulse rate between diploid controls and autotriploids was only about 13 per cent in H. chrysoscelis and H. japonica [11,12], pulse rate in autotetraploids of the latter species showed a decrease of about 24 per cent [12]. A difference of this magnitude would have made possible call discrimination by both diploids (ancestral H. chrysoscelis and extinct diploid lineages) and presumably by the newly formed allotetraploids (H. versicolor) [7].…”

Section: Resultsmentioning

confidence: 99%

“…The three diploid controls made the same choices as naturally occurring diploids (electronic supplementary material, table S1). A previous study found that the mean pulse rate of the calls of autotriploid males at 208C was about 42 pps [11].' 4.…”

Section: Resultsmentioning

confidence: 99%

“…The most likely proximate (general) cause is the well-documented direct relationship between ploidy level and cell size, which occurs in both autopolyploids and allopolyploids [3,8,11,22]. Indeed, a telling result from a previous study was the fact that pulse rate did not shift from that of diploid controls in three male autotriploids of H. chrysoscelis whose cell size also failed to increase [11]. Nevertheless, because different tissues and systems control vocalization and auditory pattern recognition, respectively, we had no a priori reason to expect the parallel change documented here.…”

Section: Resultsmentioning

confidence: 99%

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Parallel changes in mate-attracting calls and female preferences in autotriploid tree frogs

Tucker

Gerhardt

2011

Proc. R. Soc. B.

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For polyploid species to persist, they must be reproductively isolated from their diploid parental species, which coexist at the same time and place at least initially. In a complex of biparentally reproducing tetraploid and diploid tree frogs in North America, selective phonotaxis-mediated by differences in the pulserepetition (pulse rate) of their mate-attracting vocalizations-ensures assortative mating. We show that artificially produced autotriploid females of the diploid species (Hyla chrysoscelis) show a shift in pulserate preference in the direction of the pulse rate produced by males of the tetraploid species (Hyla versicolor). The estimated preference function is centred near the mean pulse rate of the calls of artificially produced male autotriploids. Such a parallel shift, which is caused by polyploidy per se and whose magnitude is expected to be greater in autotetraploids, may have facilitated sympatric speciation by promoting reproductive isolation of the initially formed polyploids from their diploid parental forms. This process also helps to explain why tetraploid lineages with different origins have similar advertisement calls and freely interbreed.

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Section: Introductionsupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Parallel changes in mate-attracting calls and female preferences in autotriploid tree frogs

Tucker

Gerhardt

2011

Proc. R. Soc. B.

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“…Taking this into account, the behavioral preference of females for different pulse repetition rates in di-, tri-, and tetraploid specimen of the Hyla chrysoscelis complex might be a consequence of different genome sizes, which affect cell dimensions (Keller and Gerhardt 2001;Tucker and Gerhardt 2012). Moreover, electrophysiological recordings in the torus of B. bombina (11.38 pg) with large neurons and R. temporaria (4.26 pg) with smaller neurons indicate that neurons in B. bombina do not synchronize to high stimulus pulse repetition rates as do neurons in R. temporaria (Walkowiak 1980).…”

Section: Discussionmentioning

confidence: 99%

The Influence of Genome and Cell Size on Brain Morphology in Amphibians

Roth

Walkowiak

2015

Cold Spring Harb Perspect Biol

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In amphibians, nerve cell size is highly correlated with genome size, and increases in genome and cell size cause a retardation of the rate of development of nervous (as well as nonnervous) tissue leading to secondary simplification. This yields an inverse relationship between genome and cell size on the one hand and morphological complexity of the tectum mesencephali as the main visual center, the size of the torus semicircularis as the main auditory center, the size of the amphibian papilla as an important peripheral auditory structure, and the size of the cerebellum as a major sensorimotor center. Nervous structures developing later (e.g., torus and cerebellum) are more affected by secondary simplification than those that develop earlier (e.g., the tectum). This effect is more prominent in salamanders and caecilians than in frogs owing to larger genome and cells sizes in the former two taxa. We hypothesize that because of intragenomic evolutionary processes, important differences in brain morphology can arise independently of specific environmental selection.

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Geographic variation in hybridization across a reinforcement contact zone of chorus frogs (Pseudacris)

Lemmon

Juenger

2017

Ecology and Evolution

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Reinforcement contact zones, which are secondary contact zones where species are diverging in reproductive behaviors due to selection against hybridization, represent natural laboratories for studying speciation‐in‐action. Here, we examined replicate localities across the entire reinforcement contact zone between North American chorus frogs Pseudacris feriarum and P. nigrita to investigate geographic variation in hybridization frequencies and to assess whether reinforcement may have contributed to increased genetic divergence within species. Previous work indicated these species have undergone reproductive character displacement (RCD) in male acoustic signals and female preferences due to reinforcement. We also examined acoustic signal variation across the contact zone to assess whether signal characteristics reliably predict hybrid index and to elucidate whether the degree of RCD predicts hybridization rate. Using microsatellites, mitochondrial sequences, and acoustic signal information from >1,000 individuals across >50 localities and ten sympatric focal regions, we demonstrate: (1) hybridization occurs and (2) varies substantially across the geographic range of the contact zone, (3) hybridization is asymmetric and in the direction predicted from observed patterns of asymmetric RCD, (4) in one species, genetic distance is higher between conspecific localities where one or both have been reinforced than between nonreinforced localities, after controlling for geographic distance, (5) acoustic signal characters strongly predict hybrid index, and (6) the degree of RCD does not strongly predict admixture levels. By showing that hybridization occurs in all sympatric localities, this study provides the fifth and final line of evidence that reproductive character displacement is due to reinforcement in the chorus frog contact zone. Furthermore, this work suggests that the dual action of cascade reinforcement and partial geographic isolation is promoting genetic diversification within one of the reinforced species.

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Polyploidy alters advertisement call structure in gray treefrogs

Cited by 50 publications

References 33 publications

Parallel changes in mate-attracting calls and female preferences in autotriploid tree frogs

Parallel changes in mate-attracting calls and female preferences in autotriploid tree frogs

The Influence of Genome and Cell Size on Brain Morphology in Amphibians

Geographic variation in hybridization across a reinforcement contact zone of chorus frogs (Pseudacris)

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