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Authordc.contributor.authorRamos Jiliberto, Rodrigo 
Authordc.contributor.authorHeine Fuster, Inger 
Authordc.contributor.authorReyes, Claudio A. 
Authordc.contributor.authorGonzález Barrientos, Javier 
Cita de ítemdc.identifier.citationEcol Res (2016) 31: 811–820es_ES
Abstractdc.description.abstractInteraction strength among species plays a crucial role in shaping the functioning of ecological communities, but it is often assumed to be insensitive to inter-individual variation in underlying parameters such as attack rates or handling time. Ecological factors including stressors exert age/size-dependent effects on such behavioral parameters, promoting shifts in the distribution of parameter values over ages. Here we analyze the effects of the pesticide methamidophos on the Daphnia-microalga interaction strength. We first analyze age-dependent effects of the pesticide on the Daphnia functional response, and then decompose the population-level effects of the stressor into contributions of shifts in elevation (i.e., vertical effect) versus shifts in nonlinearity (i.e., nonlinear effect) of the response of interaction strength over consumer age. Our results show that (1) Rogers and Holling type II functional response models best fitted the empirical functional responses of Daphnia of different ages, (2) attack rate and handling time were affected by the pesticide, (3) these effects were age-specific, shifting the average attack rate and both the mean and coefficient of variation of handling time of different age classes, (4) population level interaction strength was affected by pesticide exposure by variation in both elevation and nonlinearity of its response over consumer age. We show that both vertical and nonlinear effects were important in magnitude but opposite in sign. The consequences of factors that exert age/size dependent effects can only be evaluated through properly considering inter-individual variation.es_ES
Patrocinadordc.description.sponsorshipFondo Nacional de Desarrollo Cientifico y Tecnologico (Ministry of Education, Chile) FONDECYT 1150348 CONICYT Doctoral fellowship (CONICYT-PCHA/Doctorado Nacional) 2015-211521 CONICYTes_ES
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link to Licensedc.rights.uri*
Sourcedc.sourceEcological Researches_ES
Keywordsdc.subjectFunctional responsees_ES
Keywordsdc.subjectStructured populationses_ES
Keywordsdc.subjectNonlinear functionses_ES
Keywordsdc.subjectFeeding ratees_ES
Títulodc.titleOntogenetic shift in Daphnia-algae interaction strength altered by stressors: revisiting Jensen’s inequalityes_ES
Document typedc.typeArtículo de revista
Indexationuchile.indexArtículo de publicación ISIes_ES

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Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Chile