Messages conveyed by assorted facets of the dewlap, in both sexes of Anolis sagrei

Driessens, Tess; Huyghe, Katleen; Vanhooydonck, Bieke; Damme, Raoul Van

doi:10.1007/s00265-015-1938-5

Cited by 25 publications

(40 citation statements)

References 87 publications

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“…Our results, and those of Driessens et al (2015), contradict the idea that dewlap size approaches an asymptote. Male A. aquaticus and A. sagrei dewlaps had allometric slopes (b = 3.02 and 3.42, respectively) derived from reduced major axis regression analyses that substantially deviated from isometry (this study; Driessens et al 2015). Whether males of other Anolis species also bear a super-honest dewlap remains unexplored.…”

Section: The Super-honest Information Content Of a Widespread Sexual contrasting

confidence: 65%

“…enhanced risk of predation) may ultimately limit the size of this sexual ornament in large individuals (Echelle et al 1978), a suggestion echoed by Vanhooydonck et al (2005b). Our results, and those of Driessens et al (2015), contradict the idea that dewlap size approaches an asymptote. Male A. aquaticus and A. sagrei dewlaps had allometric slopes (b = 3.02 and 3.42, respectively) derived from reduced major axis regression analyses that substantially deviated from isometry (this study; Driessens et al 2015).…”

Section: The Super-honest Information Content Of a Widespread Sexual contrasting

confidence: 51%

“…Similarly, we found no correlation between the redorange A. aquaticus dewlap brightness (PC1 COL or PC-2 COL ) and male condition. By contrast, Driessens et al (2015) found that the brightness of the red and yellow regions of the A. sagrei dewlap correlated with body condition but, as a different body condition proxy (size-corrected mass) was used, direct comparisons with our condition proxy are not possible. Red, orange and yellow dewlap colors are produced by a combination of pterin and carotenoid pigments (Ortiz et al 1963;Steffen & McGraw 2007;Alfonso et al 2013).…”

Section: The Super-honest Information Content Of a Widespread Sexual mentioning

confidence: 82%

“…To our knowledge, this is one of the first studies to report that the Anolis dewlap exhibits positive allometry (see also Driessens et al 2015). Until recently, understanding of this genus-wide sexual ornament was based on a study by Echelle et al (1978).…”

Section: The Super-honest Information Content Of a Widespread Sexual mentioning

confidence: 86%

“…In most anoles, dewlap size is an honest indicator of bite force (Vanhooydonck et al 2005a,b). Dewlap color may correlate with condition, testosterone, immunity and contest success (Cook et al 2013;Steffen & Guyer 2014;Cox et al 2015;Driessens et al 2015) and is a target of female choice (Sigmund, 1983;Cook et al 2013). Consequently, the dewlap fulfills many of the criteria of a reliable indicator of individual quality ( Vanhooydonck et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Trait allometries generate super‐honesty in Anolis dewlaps and may underlie sexual dimorphism

Petelo

Swierk

2017

Integrative Zoology

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Whether or not sexually selected traits consistently exhibit positive allometry (i.e. are disproportionately large in larger individuals) is an ongoing debate. Multiple models and exceptions to this rule suggest that the underlying drivers of sexual trait allometry are nuanced. Here, we compare allometries of sexual and non-sexual traits of a species (Anolis aquaticus) within a well-studied lizard genus to test the competing hypotheses that sexual traits are, or are not, defined by positive allometry. We further consider the relationships of trait functions, which are relatively well understood in the genus Anolis, and allometry to identify potential drivers of allometric patterns. In particular, we explore how trait allometries interact to influence total organism function and generate sexual dimorphism. We quantified size (of targeted traits) and color of a sexual signal (the dewlap) in Anolis aquaticus in the field. The dewlap conveyed information relevant to intra-sexual combat and exhibited positive allometry. Overall, our results suggest that using single-trait allometries as indicators of past selection provides only an incomplete understanding of trait evolution. Although the function of positive allometry in some individual sexual signals (e.g. those conveying "super-honest" information) may be straightforward, we illustrate how scaling relationships interact synergistically to influence the function of phenotypes and propose avenues for future research.

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Section: The Super-honest Information Content Of a Widespread Sexual contrasting

confidence: 65%

Section: The Super-honest Information Content Of a Widespread Sexual contrasting

confidence: 51%

Section: The Super-honest Information Content Of a Widespread Sexual mentioning

confidence: 82%

Section: The Super-honest Information Content Of a Widespread Sexual mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Trait allometries generate super‐honesty in Anolis dewlaps and may underlie sexual dimorphism

Petelo

Swierk

2017

Integrative Zoology

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Local and systemic immune responses to different types of phytohemagglutinin in the green anole: Lessons for field ecoimmunologists

Tylan

Langkilde

2017

J Exp Zool Pt A

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The phytohemagglutinin (PHA) skin test is commonly used by ecologists to assess cell-mediated immune function of wild animals. It can be performed quickly and easily in the field, involving injection of PHA and measurement of the resultant swelling. There are multiple formulations of PHA used in ecological studies, with potentially differing outcomes that could produce inconsistent results. We tested two common types of PHA in the green anole (Anolis carolinensis) to identify local and systemic immune responses underlying the resultant swelling at 6, 18, 24, and 48 hr post injection. There were differences in both local (injection site) and systemic (blood) leukocyte responses to PHA-L versus PHA-P. PHA-P injection produced a greater overall increase in local heterophil count at the injection site compared with PHA-L, and this response was greatest at 6 and 24 hr post injection. Systemically, heterophil percentage was higher in the blood of PHA-P- versus PHA-L-injected anoles at 24 hr post injection; the time point at which heterophil percentage peaked in PHA-P-injected anoles. These results indicate that although both PHA types are effective tests of immune function in green anoles, the PHA-P swelling response invokes a much stronger heterophilic response. PHA-L is a more specific test of lymphocyte function, particularly at 24 hr post injection, making it preferable for ecoimmunology studies.

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The Behavioral Sciences and Sociobiology: A Darwinian Approach

Alcock

2017

The Darwinian Tradition in Context

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Messages conveyed by assorted facets of the dewlap, in both sexes of Anolis sagrei

Cited by 25 publications

References 87 publications

Trait allometries generate super‐honesty in Anolis dewlaps and may underlie sexual dimorphism

Trait allometries generate super‐honesty in Anolis dewlaps and may underlie sexual dimorphism

Local and systemic immune responses to different types of phytohemagglutinin in the green anole: Lessons for field ecoimmunologists

The Behavioral Sciences and Sociobiology: A Darwinian Approach

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