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JPR Advance Access originally published online on July 8, 2008
Journal of Plankton Research 2008 30(10):1117-1122; doi:10.1093/plankt/fbn071
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Immediate and delayed life-history responses of Daphnia ambigua to conspecific cues

J. L. Carvajal-Salamanca1,*, A. Aránguiz-Acuña1,2,3, R. Ramos-Jiliberto1 and L. R. Zúñiga4

1 Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile 2 Instituto de Ecología y Biodiversidad, Las Palmeras 3425, Ñuñoa, Santiago, Chile 3 Centro Nacional del Medio Ambiente, CENMA, Larraín 9975, La Reina, Santiago, Chile 4 Instituto de Biología, Facultad de Ciencias Básicas y Matemáticas, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2950, Valparaíso, Chile

* CORRESPONDING AUTHOR: jlcarvajalsalamanca{at}gmail.com; jcarvajalsalamanca{at}yahoo.com

Received on November 24, 2007; accepted on July 4, 2008


  Abstract

Studies of planktonic organisms have shown that various life-history traits, and consequently population growth rate, can be affected by chemical cues released by high densities of conspecifics. In this work we test for potential delays in population responses to conspecific cues in the cladoceran Daphnia ambigua through: (i) evaluating the influence of maternal environment on life-history traits of their daughters, and (ii) identifying the developmental stages that need to be exposed to conspecific cues to observe significant changes in life-history attributes. Our results revealed that exposure to conspecific cues decreased population growth rate of D. ambigua, mainly due to reduced offspring number and delayed maturation. Growth rate reduction was also dependent on the mother’s environment, and interaction effects arose between current generation and past-generation environments. The observed variations in maturity and fertility were triggered by exposure to conspecific cues during early development. We hypothesize that conspecific cues are able to induce delayed life-history effects and therefore delayed density dependence at the population level.

Corresponding editor: Roger Harris


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