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Maternal effects on phenotypic plasticity in larvae of the salamander Hynobius retardatus

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Title: Maternal effects on phenotypic plasticity in larvae of the salamander Hynobius retardatus
Authors: Michimae, Hirofumi Browse this author →KAKEN DB
Nishimura, Kinya Browse this author
Tamori, Yoichiro Browse this author
Wakahara, Masami Browse this author
Keywords: character correlation
egg size
maternal effects
phenotypic plasticity
salamander
Issue Date: Jun-2009
Publisher: Springer
Journal Title: Oecologia
Volume: 160
Issue: 3
Start Page: 601
End Page: 608
Publisher DOI: 10.1007/s00442-009-1319-8
PMID: 19352721
Abstract: Maternal effects are widespread and influence a variety of traits, for example, life history strategies, mate choice and capacity to avoid predation. Therefore, maternal effects may also influence phenotypic plasticity of offspring, but few studies have addressed the relationship between maternal effects and phenotypic plasticity of offspring. We examined the relationship between a maternally influenced trait (egg size) and the phenotypic plasticity of the induction rate of the broad-headed morph in the salamander Hynobius retardatus. The relationship between egg size and the induction of the broad-headed morph was tested across experimental crowding conditions (densities of low conspecifics, high conspecifics, and high heterospecific anuran), using eggs and larvae from eight natural populations with different larval densities of conspecifics and heterospecifics. The broad-headed morph has a large mouth that enables it to consume either conspecifics or heterospecifics, and this ability gives survival advantages over the normal morph. We have determined that there is phenotypic plasticity in development, as shown by an increase in the frequency of broad-headed morph in response to an increase in the density of conspecifics and heterospecifics. This reaction norm differed between populations. We also determined that the frequency of the broad-headed morph is affected by egg size in which larger egg size resulted in expression of the broad-headed morph. Furthermore, we determined that selection acting on the propensity to develop the broad-headed morph has produced a change in egg size. Lastly, we found that an increase in egg size alters the reaction norm to favor development of the broad-headed morph. For example, an equal change in experimental density produces a greater change in the frequency of the broad-headed morph in larvae developing from large eggs than it does in larvae developing from small eggs. Population differences in plasticity might be the results of differences in egg size between populations, which is caused by the adaptive integration of the plasticity and egg size. Phenotypic plasticity can not evolve independently of maternal effects.
Rights: The original publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/43308
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 道前 洋史

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