Felipe Dargent

Felipe Dargent
University of Ottawa · Department of Biology

PhD

About

18
Publications
2,097
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171
Citations
Introduction
My current research in evolutionary ecology focuses on assessing the rate and nature of anti-parasite defense evolution under different environmental regimes, through field and lab assays. www.felipedargent.com
Additional affiliations
September 2018 - present
University of Toronto
Position
  • PostDoc Position
September 2017 - August 2018
Carleton University
Position
  • PostDoc Position
April 2017 - present
University of Ottawa
Position
  • PostDoc Position
Education
September 2008 - October 2014
McGill University
Field of study
  • Biology
March 2001 - December 2006
Pontifical Catholic University of Peru
Field of study
  • Geography and Environment

Publications

Publications (18)
Article
Full-text available
The patterns and mechanisms by which biological diversity is associated with parasite infection risk are important to study because of their potential implications for wildlife population’s conservation and management. Almost all research in this area has focused on host species diversity and has neglected parasite diversity, despite evidence that...
Article
We evaluated the extent to which males and females evolve along similar or different trajectories in response to the same environmental shift. Specifically, we used replicate experimental introductions in nature to consider how release from a key parasite (Gyrodactylus) generates similar or different defence evolution in male vs. female guppies (Po...
Article
Full-text available
Parasites are detrimental to host fitness and therefore should strongly select for host defence mechanisms. Yet, hosts vary considerably in their observed parasite loads. One notable source of inter-individual variation in parasitism is host sex. Such variation could be caused by the immunomodulatory effects of gonadal steroids. Here we assess the...
Article
Full-text available
A reduction in the strength of selection is expected to cause the evolution of reduced trait expression. Elimination of a parasite should thus cause the evolution of reduced resistance to that parasite. To test this prediction in nature, we studied the fourth- and eighth-generation descendants of guppies (Poecilia reticulata) introduced into four n...
Article
Full-text available
Predation and parasitism are two of the most important sources of mortality in nature. By forming groups, individuals can gain protection against predators but may increase their risk of being infected with contagious parasites. Animals might resolve this conflict by forming mixed-species groups thereby reducing the costs associated with parasites...
Article
Every year monarch butterflies (Danaus plexippus Linnaeus, 1758) from the eastern North American population migrate from Mexico to Southern Canada in the spring. This northward migration has been shown to reduce monarch infection with the host-specific parasite Ophryocystis elektroscirrha (OE) (McLaughlin and Myers, 1970); yet, the prevalence of OE...
Article
Parasites and pathogens (hereafter parasites) commonly challenge organisms, but the extent to which their infections are physiologically stressful to hosts remains unclear. Importantly, vertebrate hormones, glucocorticoids (GCs), have been reported to increase, decrease, or show no alterations stemming from infections, challenging the generality of...
Article
Progress toward local adaptation is expected to be enhanced when divergent selection is multidimensional, because many simultaneous sources of selection can increase the total strength of selection and enhance the number of independent traits under selection. Yet, whether local adaptation ensues from multidimensional selection also depends on its p...
Article
Studies generally have neglected parasite-centric views in explorations of whether the oft-seen patterns of parasite aggregation are adaptive. Using simulation models, we explored the effects of aggregation on coinfection with hetero- or conspecific parasite species characterized by different mean abundances. Increasing aggregation increased the pr...
Article
Full-text available
Gynogenetic organisms are asexual females of one species that require sperm from males of another species to initiate reproduction (but except in rare instances of ‘paternal leakage’, those sperm do not contribute to the genetic make-up of the gynogens’ offspring). Gynogenetic organisms seem to combine disadvantages of both sexual and asexual repro...
Article
Full-text available
In Dargent et al . [[1][1]], we reported the evolution of increased resistance in populations of wild female guppies after the removal of an ectoparasite ( Gyrodactylus turnbulli ) and discussed possible mechanisms for this unexpected outcome. In her comment, Stephenson proposes two additional
Presentation
Full-text available
Background/Question/Methods It is commonly assumed that reducing the strength of selection favoring a particular trait should cause the evolution of reduced expression of that trait. We tested this prediction in the wild by assessing evolution of the trait “resistance against parasites.” Guppies (Poecilia reticulata) from a Trinidadian stream were...
Article
Identifying the environmental factors responsible for the formation of a species' distribution limit is challenging because organisms interact in complex ways with their environments. However, the use of statistical niche models in combination with the analysis of phenotypic variation along environmental gradients can help to reduce such complexity...
Article
Full-text available
SUMMARY Understanding disease transmission is important to species management and human health. Host body condition, nutrition and disease susceptibility interact in a complex manner, and while the individual effects of these variables are well known, our understanding of how they interact and translate to population dynamics is limited. Our object...
Article
Full-text available
Studies of phenotypic variation in nature often consider only a single potential selective agent. In such cases, it remains an open question as to whether variation attributed to that single measured agent might be influenced by some other unmeasured agent. Previous research has shown that phenotypic variation in the Trinidadian guppy (Poecilia ret...
Presentation
Background/Question/Methods Although individuals tend to prefer forming groups with conspecifics, mixed-species groups occur in various taxa and are thought to be adaptive. The two main explanations proposed for the formation of mixed-species groups are increased defense against predators through dilution of individual risk and increased resource a...

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Projects

Projects (2)
Archived project
Despite instances where a source of selection is removed or decreased (i.e. relaxed selection) being common, most of our understanding of evolution is built on cases where a new source of selection emerges or a previously present one increases. My research addresses how various components of host defence (e.g. resistance and tolerance) evolve under relaxed selection in natural environments, where interactions with co-existing species – beyond the host-parasite pair dynamic- can influence the evolutionary trajectories of traits.
Project
Parasites typically show patterns of aggregation on their hosts, whereby few hosts carry the vast majority of the parasite population and many hosts carry few to no parasites. We are asking why questions about how this pattern evolved, based on the potential for selection on individual parasites.