title: Offspring reaction norms shaped by parental environment: interaction between within- and trans-generational plasticity of inducible defenses.
abstract: Within-generational plasticity (WGP) and transgenerational plasticity (TGP) are mechanisms allowing rapid adaptive responses to fluctuating environments without genetic change. These forms of plasticity have often been viewed as independent processes. Recent evidence suggests that WGP is altered by the environmental conditions experienced by previous generations (i.e., TGP). In the context of inducible defenses, one of the most studied cases of plasticity, the WGP x TGP interaction has been poorly investigated.
  
  
  
  We provide evidence that TGP can alter the reaction norms of inducible defenses in a freshwater snail. The WGP x TGP interaction patterns are trait-specific and lead to decreased slope of reaction norms (behaviour and shell thickness). Offspring from induced parents showed a higher predator avoidance behaviour and a thicker shell than snails from non-induced parents in no predator-cue environment while they reached similar defenses in predator-cue environment. The WGP x TGP interaction further lead to a switch from a plastic towards a constitutive expression of defenses for shell dimensions (flat reaction norm).
  
  
  
  WGP-alteration by TGP may shape the adaptive responses to environmental change and then has a substantial importance to understand the evolution of plasticity.
authors.affiliation: CNRS UMR 5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, Université Claude Bernard Lyon1, Université de Lyon, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne cedex, France. emilien.luquet@univ-lyon1.fr.
authors.forename: Emilien
authors.identifier: 0000-0002-9550-8899
authors.initials: E
authors.lastname: Luquet
authors.affiliation: CNRS UMR 5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, Université Claude Bernard Lyon1, Université de Lyon, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne cedex, France.
authors.forename: Juliette
authors.initials: J
authors.lastname: Tariel
mesh_terms: D000220:Adaptation, Biological; D000818:Animals; D003400:Astacoidea; D005075:Biological Evolution; D004777:Environment; D005399:Fishes; D020387:Food Chain; D005618:Fresh Water; D012908:Snails / Q000033:anatomy & histology / Q000235:genetics / Q000502:physiology*; D012919:Social Behavior
keywords: Inducible defenses; Phenotypic plasticity; Physa acuta; Predator-prey interactions; Reaction norm; Transgenerational plasticity