Faster Lizards Sire More Offspring: Sexual Selection on Whole-Animal Performance

Husak, Jerry F.; Fox, Stanley F.; Lovern, Matthew B.; Bussche, Ronald A. Van Den

doi:10.1554/05-647.1

Cited by 73 publications

(84 citation statements)

References 70 publications

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“…Indeed, the relationships between jumping and fitness and testis morphology and fitness have yet to be empirically determined in this species. Nonetheless, a decline in fitness due to reduced locomotory ability is consistent with findings from previous studies investigating the evolutionary and ecological relevance of whole-organism performance in other vertebrate species (e.g., Husak et al 2006;Phillips et al 2006). Our data suggest that future studies measuring the form and intensity of selection acting on jumping performance in L. pipiens over longer time periods would be valuable for understanding the impact of such infections on evolutionary trajectories in this species.…”

Section: Discussionsupporting

confidence: 90%

Fitness Consequences of Infection by Batrachochytrium dendrobatidis in Northern Leopard Frogs (Lithobates pipiens)

et al. 2013

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The amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd), has been linked to amphibian declines and extinctions worldwide. The pathogen has been found on amphibians throughout eastern North America, but has not been associated with mass die-offs in this region. In this study, we conducted laboratory experiments on the effects of Bd infection in a putative carrier species, Lithobates pipiens, using two estimators of fitness: jumping performance and testes morphology. Over the 8-week study period, peak acceleration during jumping was not significantly different between infected and uninfected animals. Peak velocity, however, was significantly lower for infected animals after 8 weeks. Two measures of sperm production, germinal epithelium depth, and maximum spermatic cyst diameter, showed no difference between infected and uninfected animals. The width, but not length, of testes of infected animals was significantly greater than in uninfected animals. This study is the first to show effects on whole-organism performance of Bd infection in post-metamorphic amphibians, and may have important long-term, evolutionary implications for amphibian populations co-existing with Bd infection.

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Section: Discussionsupporting

confidence: 90%

Fitness Consequences of Infection by Batrachochytrium dendrobatidis in Northern Leopard Frogs (Lithobates pipiens)

et al. 2013

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“…In contrast with our study, several previous studies have found greater locomotor performance to be positively associated with social dominance (Garland et al, 1990;Hews, 1990;Robson and Miles, 2000;Lailvaux et al, 2004;Perry et al, 2004;Husak et al, 2006a;Peterson and Husak, 2006;Hall et al, 2010). However, a study by Huyghe et al, (2005), found no correlation between locomotor performance and dominance, but rather between increased bite force capacity and dominance (Huyghe et al, 2005).…”

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confidence: 99%

“…Several studies have demonstrated sexual selection targets whole-organism performance such as locomotor and fighting capacities, that are often used during territorial disputes and other male-male agonistic interactions (Husak et al, 2006a;Husak et al, 2006b;Irschick et al, 2007). These studies have established that males and females frequently differ in whole-organism performance, as they do in sexually dimorphic traits (Cullum, 1998;Lailvaux et al, 2003;Krasnov et al, 2004).…”

Section: Sexual Selection and Performancementioning

confidence: 99%

“…Under sexual selection, phenotypic differences between males and females develop as a result of the different roles each sex plays in reproduction, where selection favours traits that improve the reproductive success of each sex (Darwin, 1871;Andersson, M., 1994;Fairbairn, 1997;Arnqvist, G. and Rowe, L., 2005). For instance, males of territorial species commonly have enhanced traits (both morphological and functional) to increase their success in territorial disputes and access to limited resources, thereby improving their acquisition of mates (Andersson, M., 1994;Husak et al, 2006a;Huyghe et al, 2013). Such intrasexual competition is generally greater in males because they typically invest less in reproduction than females at both the gamete and offspring stage (Vitt and Cooper, 1985;Andersson, M., 1994;Le Galliard and Ferriere, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Sex-specific variation in morphology and performance in the Asian house gecko

Cameron¹

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Ever since Darwin's theory of sexual selection was first published, understanding the evolutionary mechanisms that lead to sex-specific traits and quantifying patterns therein has been a large focus of evolutionary ecologists. Sexual variation in phenotypes in form and function is ubiquitous in nature, and its extent varies widely, within closely related groups and even species. Understanding patterns and the circumstances under which sexually divergent phenotypes evolve requires an understanding of both the proximate and evolutionary mechanisms involved. While studies have primarily focused on sex-specific morphological traits such as size and secondary trait dimorphism, less attention has been given to the functional differences between the sexes. From an evolutionary perspective, sexspecific traits result from many factors that act differentially on each sex, modifying phenotypic and behavioural components that influence the capacity of fulfilling reproductive roles. Therefore, sexual selection alone does not define the magnitude of phenotypic divergence between the sexes, but it is rather the interplay between sexual and natural selection and their interactions with the environment. Intraspecific studies investigating associations between form and function of sexspecific traits provide a useful tool to understand the fundamental mechanisms that lead to the evolution of complex traits in males and females. The overall aim of this thesis was to gain a better understanding of the evolutionary mechanisms that drive patterns in sex-specific phenotypes, using a territorial gecko species (Hemidactylus frenatus) distributed over a large latitudinal cline.The first aim of this thesis was to examine the potential trade-offs between performance functions associated with reproductive success and to test whether compensatory mechanisms may obscure the detection of such costs (Chapter 2). Fighting capacity and escape performance of male H. frenatus are likely to pose conflicting demands on the optimum phenotype for each task. Highly territorial and aggressive males may require greater investment in head size/strength but such an enhancement may reduce overall escape performance. To test this idea, the second aim (also in Chapter 2) was to determine the role of morphological and functional traits in determining the outcome of male-male combat (reproductive success) and prey-capture ability (survivorship).Among male geckos, I found that larger head size resulted in greater biting capacity, but at a cost of reduced spring performance. Females, however, showed no evidence of this trade-off. The sex specificity of this trade-off suggests that the sexes differ in their optimal strategies for dealing with the conflicting requirements of bite force and sprint speed. Unlike males, female H. frenatus had a positive association between hind-limb length and head size, suggesting that they have utilised a compensatory mechanism to alleviate the possible locomotor costs of larger head sizes. It appears that there is greater sel...

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“…Reilly, 2013;) because many ecologically relevant activities, such as escaping from predators, foraging and searching for reproductive partners, depend on locomotion (Meylan and Clobert, 2004;Husak et al, 2006). Therefore, locomotor performance has been widely regarded as probably associated with fitness (Christian and Tracy, 1981;Garland, 1999).…”

Section: Introductionmentioning

confidence: 99%

Coevolução do comportamento antipredatório, desempenho locomotor e morfologia em anuros da Floresta Atlântica

Citadini¹

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Em primeiro lugar a Deus por ter me dado saúde, força e coragem para continuar, por ter colocado pessoas maravilhosas em meu caminho e por estar sempre comigo nos momentos em que mais precisei da sua Luz.Ao meu orientador, o prof. Dr. Fernando Ribeiro Gomes, por toda a orientação, por dividir comigo todo o seu conhecimento, por acalmar nos momentos mais tensos e por sempre ter uma palavra amiga quando mais precisei.Aos profs. Drs da minha banca de qualificação: Vanessa Verdade, Renata Brandt e Carlos Navas, pelos comentários e sugestões. Aos amigos do laboratório de Ecofisiologia e Fisiologia Evolutiva: Ananda, Antônio (Toninho), Camila, Carla, Eleonora, Inês, Isabel, Gustavo, Jesus, Juan, Mariana, Renata, por toda ajuda prestada em diversos momentos.Ao pessoal em que tive o privilégio de tê-los presentes nos campos, são tantas pessoas maravilhosas que me ajudaram na coleta em meio as fortes chuvas, raios, pernilongos, atolamento de carro, obrigada pelas noites nos brejos, riachos, pastos .... o que seria deste trabalho sem vocês!!!! Agradeço a Eleonora Domenico, por fazer parte da minha primeira coleta de dados na região de Jataí.À Maya Maia, por toda a sua ajuda durante as coletas na E. E. de Boracéia -SP.À Adriana Barsotti (Di), Eduardo Moretti (Popetar) e a Inês Rosa (amiga uruguaia) pela ajuda nas coletas no Jardim Botânico de São Paulo.Aos meus amigos colombianos: Faride (Fari), Camila (Cami), Jesus (Chucho) pela coleta no Parque Estadual de Intervales e pelos patacones feitos em campo, gracias!!!! Ao prof. Dr. Luciano Alves dos Anjos, da UNESP de Ilha Solteira e a sua equipe: Juma, Otilie, Douglas e Murilo, por me receber tão bem e por toda a ajuda na coleta em Selvíria -MS.À amiga e profa. Dra. Cristiele, obrigada pela hospedagem e pela acolhida em Ilha Solteira -SP. Ao prof. Dr. Craig Williams, supervisor durante meu estágio na University of South Australia, obrigada pela oportunidade de realizar o estágio BEPE e aos seus alunos: Natasha Wilsom, Emily Flies, Katherine Faull, ao Steven Fricker, por toda a ajuda e por me mostrar um pouco desse maravilhoso país.Aos meus amigos "brazucas" Aline Dal Olio Gomes, Adriana Amorim e Carlos Eduardo Tolussi, pela companhia constante em Adelaide e por tornar essa experiência ainda mais inesquecível na Austrália. Aos amigos do Departamento de Fisiologia do Instituto de Biociências daUniversidade de São Paulo que me ajudaram em diversos momentos durante os experimentos, pelas conversas regadas a café na copa, pelos churrascos e pelos momentos de descontração.À nossa querida secretária da Fisiologia: Roseli Santos (Rose), por ser tão dedicada, e por sempre nos auxiliar com a parte burocrática;Aos funcionários da Pós-Graduação: Érica, Lilian, Patrícia, Helder e Gilmar, por todo apoio prestado.As minhas amigas, o qual eu tive o privilégio de conhecer durante o aprimoramento no Instituto Butantan: Alessandra Bizerra, Alessandra Schunck, Cibele Barbarini, Cynthia Iszlaji, Isa dos Santos, Fabíola Meireles, Juliana Bettini Cyzaukas, obrigada pelos encontros que sempre foram ...

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Faster Lizards Sire More Offspring: Sexual Selection on Whole-Animal Performance

Cited by 73 publications

References 70 publications

Fitness Consequences of Infection by Batrachochytrium dendrobatidis in Northern Leopard Frogs (Lithobates pipiens)

Fitness Consequences of Infection by Batrachochytrium dendrobatidis in Northern Leopard Frogs (Lithobates pipiens)

Sex-specific variation in morphology and performance in the Asian house gecko

Coevolução do comportamento antipredatório, desempenho locomotor e morfologia em anuros da Floresta Atlântica

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