Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.7/360
Título: Ecdysteroid Hormones Link the Juvenile Environment to Alternative Adult Life Histories in a Seasonal Insect
Autor: Oostra, Vicencio
Mateus, Ana Rita A.
van der Burg, Karin R. L.
Piessens, Thomas
van Eijk, Marleen
Brakefield, Paul M.
Beldade, Patrícia
Zwaan, Bas J.
Palavras-chave: developmental plasticity
seasonal adaptation
life history
resource allocation
diapause
polyphenism
20-hydroxyecdysone
Data: Set-2014
Editora: The University of Chicago Press
Citação: Ecdysteroid Hormones Link the Juvenile Environment to Alternative Adult Life Histories in a Seasonal Insect. Vicencio Oostra, Ana Rita A. Mateus, Karin R. L. van der Burg, Thomas Piessens, Marleen van Eijk, Paul M. Brakefield, Patrícia Beldade, and Bas J. Zwaan The American Naturalist, Vol. 184, No. 3 (September 2014), pp. E79-E92.
Resumo: The conditional expression of alternative life strategies is a widespread feature of animal life and a pivotal adaptation to life in seasonal environments. To optimally match suites of traits to seasonally changing ecological opportunities, animals living in seasonal environments need mechanisms linking information on environmental quality to resource allocation decisions. The butterfly Bicyclus anynana expresses alternative adult life histories in the alternating wet and dry seasons of its habitat as endpoints of divergent developmental pathways triggered by seasonal variation in preadult temperature. Pupal ecdysteroid hormone titers are correlated with the seasonal environment, but whether they play a functional role in coordinating the coupling of adult traits in the alternative life histories is unknown. Here, we show that manipulating pupal ecdysteroid levels is sufficient to mimic in direction and magnitude the shifts in adult reproductive resource allocation normally induced by seasonal temperature. Crucially, this allocation shift is accompanied by changes in ecologically relevant traits, including timing of reproduction, life span, and starvation resistance. Together, our results support a functional role for ecdysteroids during development in mediating strategic reproductive investment decisions in response to predictive indicators of environmental quality. This study provides a physiological mechanism for adaptive developmental plasticity, allowing organisms to cope with variable environments.
Peer review: yes
URI: http://hdl.handle.net/10400.7/360
DOI: 10.1086/677260
Versão do Editor: http://www.jstor.org/stable/10.1086/677260
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