Beyond body size: muscle biochemistry and body shape explain ontogenetic variation of anti-predatory behaviour in the lizard Salvator merianae

Autor(es)

de Barros, Fabio Cury ^[1] ; de Carvalho, Jose Eduardo ^[2] ; Abe, Augusto Shinya ^[3] ; Kohlsdorf, Tiana ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Biol, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Univ Fed Sao Paulo, Dept Ciencias Biol, Campus Diadema, BR-09972270 Diadema, SP - Brazil

^[3] Univ Estadual Paulista, Inst Biociencias, Dept Zool, Campus Rio Claro, BR-13506900 Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Experimental Biology; v. 219, n. 11, p. 1649-1658, JUN 2016.
• Citações Web of Science: 0

Resumo

Anti-predatory behaviour evolves under the strong action of natural selection because the success of individuals avoiding predation essentially defines their fitness. Choice of anti-predatory strategies is defined by prey characteristics as well as environmental temperature. An additional dimension often relegated in this multilevel equation is the ontogenetic component. In the tegu Salvator merianae, adults run away from predators at high temperatures but prefer fighting when it is cold, whereas juveniles exhibit the same flight strategy within a wide thermal range. Here, we integrate physiology and morphology to understand ontogenetic variation in the temperature-dependent shift of anti-predatory behaviour in these lizards. We compiled data for body shape and size, and quantified enzyme activity in hindlimb and head muscles, testing the hypothesis that morphophysiological models explain ontogenetic variation in behavioural associations. Our prediction is that juveniles exhibit body shape and muscle biochemistry that enhance flight strategies. We identified biochemical differences between muscles mainly in the LDH:CS ratio, whereby hindlimb muscles were more glycolytic than the jaw musculature. Juveniles, which often use evasive strategies to avoid predation, have more glycolytic hindlimb muscles and are much smaller when compared with adults 1-2 years old. Ontogenetic differences in body shape were identified but marginally contributed to behavioural variation between juvenile and adult tegus, and variation in anti-predatory behaviour in these lizards resides mainly in associations between body size and muscle biochemistry. Our results are discussed in the ecological context of predator avoidance by individuals differing in body size living at temperature-variable environments, where restrictions imposed by the cold could be compensated by specific phenotypes. (AU)

• Processo FAPESP: 07/54609-5 - Estudo da sensibilidade termal em Tupinambis merianae (Squamata:Teiidae): uma abordagem ontogenética
• Beneficiário: Fábio Cury de Barros
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 05/60140-4 - Evolução de diversidade fenotípica em lagartos tropicais: uma abordagem integrativa investigando diversos níveis de organização
• Beneficiário: Tiana Kohlsdorf
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 11/24171-3 - Adaptações fenotípicas em Tropidurus torquatus (Squamata, Tropiduridae): populações periféricas evoluem sob pressões seletivas locais?
• Beneficiário: Fábio Cury de Barros
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 08/57712-4 - Instituto Nacional de Pesquisas em Fisiologia Comparada
• Beneficiário: Augusto Shinya Abe
• Modalidade de apoio: Auxílio à Pesquisa - Temático