Paedomorphosis in the Alpine newt ( Triturus alpestris ): decoupling behavioural and morphological change

Denoël, Mathieu

doi:10.1007/s00265-002-0526-7

Cited by 31 publications

(27 citation statements)

References 48 publications

(32 reference statements)

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“…Video films were analysed with Noldus Observer Video Pro 4.1 software [40], [41]. This software made possible the analysis and recording of events (instantaneous behaviour such as sound production or bites) or states (behaviours with appreciable duration such as arena digging or frontal display) by typing keys from the keyboard in synchronization with video-files.…”

Section: Methodsmentioning

confidence: 99%

Behaviours Associated with Acoustic Communication in Nile Tilapia (Oreochromis niloticus)

et al. 2013

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BackgroundSound production is widespread among fishes and accompanies many social interactions. The literature reports twenty-nine cichlid species known to produce sounds during aggressive and courtship displays, but the precise range in behavioural contexts is unclear. This study aims to describe the various Oreochromis niloticus behaviours that are associated with sound production in order to delimit the role of sound during different activities, including agonistic behaviours, pit activities, and reproduction and parental care by males and females of the species.Methodology/Principal FindingsSounds mostly occur during the day. The sounds recorded during this study accompany previously known behaviours, and no particular behaviour is systematically associated with sound production. Males and females make sounds during territorial defence but not during courtship and mating. Sounds support visual behaviours but are not used alone. During agonistic interactions, a calling Oreochromis niloticus does not bite after producing sounds, and more sounds are produced in defence of territory than for dominating individuals. Females produce sounds to defend eggs but not larvae.Conclusion/SignificanceSounds are produced to reinforce visual behaviours. Moreover, comparisons with O. mossambicus indicate two sister species can differ in their use of sound, their acoustic characteristics, and the function of sound production. These findings support the role of sounds in differentiating species and promoting speciation. They also make clear that the association of sounds with specific life-cycle roles cannot be generalized to the entire taxa.

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Section: Methodsmentioning

confidence: 99%

Behaviours Associated with Acoustic Communication in Nile Tilapia (Oreochromis niloticus)

et al. 2013

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“…Additional observations and experiments suggest that this also occurs frequently in ambystomatids (Krenz & Sever, 1995 ;Whiteman, Gutrich & Moorman, 1999). In several species, the two morphs display similar behavioural patterns at similar frequencies (Whiteman et al, 1999;Denoël et al, 2001 b ;Denoël, 2002) or exhibit only slight differences in the content and timing of courtship (Krenz & Verrell, 2002).…”

Section: Paedomorphosis : a Model For Speciation ?mentioning

confidence: 99%

“…They also use the same alternative tactics to attract females (Denoël, 2002(Denoël, , 2003b. This mating system differs from other polymorphisms in which morphs display alternative tactics or strategies with equal or different fitness payoffs (Gross, 1991(Gross, , 1996Fu, Neff & Gross, 2001).…”

Section: Paedomorphosis : a Model For Speciation ?mentioning

confidence: 99%

Evolutionary ecology of facultative paedomorphosis in newts and salamanders

Denoël¹,

2005

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Facultative paedomorphosis is an environmentally induced polymorphism that results in the coexistence of mature, gilled, and fully aquatic paedomorphic adults and transformed, terrestrial, metamorphic adults in the same population. This polymorphism has been of interest to scientists for decades because it occurs in a large number of caudate amphibian taxa as well as in a large diversity of habitats. Numerous experimental and observational studies have been conducted to explain the proximate and ultimate factors affecting these heterochronic variants in natural populations. The production of each alternative phenotype is based on a genotyperenvironment interaction and research suggests that differences in the environment can produce paedomorphs through several ontogenetic pathways. No single advantage accounts for the maintenance of this polymorphism. Rather, the interplay of different costs and benefits explains the success of the polyphenism across variable environments. Facultative paedomorphosis allows individuals to cope with habitat variation, to take advantage of environmental heterogeneity in the presence of open niches, and to increase their fitness. This process is expected to constitute a first step towards speciation events, and is also an example of biodiversity at the intraspecific level. The facultative paedomorphosis system is thus ripe for future studies encompassing ecology, evolution, behaviour, endocrinology, physiology, and conservation biology. Few other systems have been broad enough to provide varied research opportunities on topics as diverse as phenotypic plasticity, speciation, mating behaviour, and hormonal regulation of morphology. Further research on facultative paedomorphosis will provide needed insight into these and other important questions facing biologists.

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“…Although providing abundant evidence that life‐history plasticity is adaptive, previous studies have provided little evidence of ecologically‐based divergent selection on polyphenic expression within or between populations (Semlitsch & Gibbons, 1985; Semlitsch, 1987; Semlitsch & Wilbur, 1989; Semlitsch et al ., 1990; Denoël & Joly, 2001; Whiteman & Semlitsch, 2005). Moreover, metamorphic and paedomorphic adults often lack behavioural differences in mating tactics (Denoël, 2002, 2003), and there is little evidence of reproductive isolation between the morphs (Denoël et al ., 2001; Whiteman & Semlitsch, 2005; Whiteman et al ., 2006).…”

Section: Introductionmentioning

confidence: 99%

On the role of sexual selection in ecological divergence: a test of body-size assortative mating in the eastern newt Notophthalmus viridescens

Takahashi

Parris

2010

Biological Journal of the Linnean Society

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Speciation processes initiated by divergent selection often fail to complete; yet, how sexual selection is involved in the progress of ecological speciation is rarely understood. Intraspecific body-size variation affects mate preference and male-male competition, which can consequently lead to assortative mating based on body size. In the present study, we tested the importance of body size difference in the potential of assortative mating between the two eastern newt subspecies, larger Notophthalmus viridescens viridescens and smaller Notophthalmus viridescens dorsalis. Through differential expression of life-cycle polyphenism, these two subspecies are adapted to contrasting environments, which has likely led to the subspecific body-size difference. We found that males of both subspecies preferred larger females of N. v. viridescens as mates presumably because of the fecundity advantage of larger females. On the other hand, no evidence of female choice was found. Larger males of N. v. viridescens exhibited greater competitive ability and gained primary access to larger females of their own kind. However, smaller males were able to overcome their inferior competitive ability by interfering with larger males' spermatophore transfer and sneakily mating with larger females. Thus, the subspecific body-size difference importantly affected sexual selection processes, resulting in nonrandom but not completely assortative mating patterns between the larger and smaller subspecies. Although life-cycle polyphenism facilitates the intraspecific ecological divergence within N. v. viridescens sexual selection processes, namely smaller males' mate preference for larger females and sexual interference during spermatophore transfer, may be halting completion of the ecological speciation.

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Paedomorphosis in the Alpine newt ( Triturus alpestris ): decoupling behavioural and morphological change

Cited by 31 publications

References 48 publications

Behaviours Associated with Acoustic Communication in Nile Tilapia (Oreochromis niloticus)

Behaviours Associated with Acoustic Communication in Nile Tilapia (Oreochromis niloticus)

Evolutionary ecology of facultative paedomorphosis in newts and salamanders

On the role of sexual selection in ecological divergence: a test of body-size assortative mating in the eastern newt Notophthalmus viridescens

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