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Thibert-Plante, XavierORCID iD iconorcid.org/0000-0002-3982-0829
Publications (10 of 17) Show all publications
Zhang, L., Thibert-Plante, X., Ripe, J., Svanback, R. & Brännström, Å. (2019). Biodiversity loss through speciation collapse: Mechanisms, warning signals, and possible rescue. Evolution, 73(8), 1504-1516
Open this publication in new window or tab >>Biodiversity loss through speciation collapse: Mechanisms, warning signals, and possible rescue
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2019 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 73, no 8, p. 1504-1516Article in journal (Refereed) Published
Abstract [en]

Speciation is the process that generates biodiversity, but recent empirical findings show that it can also fail, leading to the collapse of two incipient species into one. Here, we elucidate the mechanisms behind speciation collapse using a stochastic individual-based model with explicit genetics. We investigate the impact of two types of environmental disturbance: deteriorated visual conditions, which reduce foraging ability and impede mate choice, and environmental homogenization, which restructures ecological niches. We find that: (1) Species pairs can collapse into a variety of forms including new species pairs, monomorphic or polymorphic generalists, or single specialists. Notably, polymorphic generalist forms may be a transient stage to a monomorphic population; (2) Environmental restoration enables species pairs to reemerge from single generalist forms, but not from single specialist forms; (3) Speciation collapse is up to four orders of magnitude faster than speciation, while the reemergence of species pairs can be as slow as de novo speciation; (4) Although speciation collapse can be predicted from either demographic, phenotypic, or genetic signals, observations of phenotypic changes allow the most general and robust warning signal of speciation collapse. We conclude that factors altering ecological niches can reduce biodiversity by reshaping the ecosystem's evolutionary attractors.

Keywords
Assortative mating, hybridization, speciation, species diversity, warning signals
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-163080 (URN)10.1111/evo.13736 (DOI)000482092600001 ()30980527 (PubMedID)
Available from: 2019-11-14 Created: 2019-11-14 Last updated: 2019-11-14Bibliographically approved
Kang, J. K. & Thibert-Plante, X. (2017). Eco-evolution in size-structured ecosystems: simulation case study of rapid morphological changes in alewife. BMC Evolutionary Biology, 17, Article ID 58.
Open this publication in new window or tab >>Eco-evolution in size-structured ecosystems: simulation case study of rapid morphological changes in alewife
2017 (English)In: BMC Evolutionary Biology, ISSN 1471-2148, E-ISSN 1471-2148, Vol. 17, article id 58Article in journal (Refereed) Published
Abstract [en]

Background: Over the last 300 years, interactions between alewives and zooplankton communities in several lakes in the U.S. have caused the alewives' morphology to transition rapidly from anadromous to landlocked. Lakes with landlocked alewives contain smaller-bodied zooplankton than those without alewives. Landlocked adult alewives display smaller body sizes, narrower gapes, smaller inter-gill-raker spacings, reach maturity at an earlier age, and are less fecund than anadromous alewives. Additionally, landlocked alewives consume pelagic prey exclusively throughout their lives whereas anadromous alewives make an ontogenetic transition from pelagic to littoral prey. These rapid, well-documented changes in the alewives' morphology provide important insights into the morphological evolution of fish. Predicting the morphological evolution of fish is crucial for fisheries and ecosystem management, but the involvement of multiple trophic interactions make predictions difficult. To obtain an improved understanding of rapid morphological change in fish, we developed an individual-based model that simulated rapid changes in the body size and gill-raker count of a fish species in a hypothetical, size-structured prey community. Model parameter values were based mainly on data from empirical studies on alewives. We adopted a functional trait approach; consequently, the model explicitly describes the relationships between prey body size, alewife body size, and alewife gill-raker count. We sought to answer two questions: ( 1) How does the impact of alewife populations on prey feed back to impact alewife size and gill raker number under several alternative scenarios? ( 2) Will the trajectory of the landlocked alewives' morphological evolution change after 150-300 years in freshwater? 

Results: Over the first 250 years, the alewives' numbers of gill-rakers only increased when reductions in their body size substantially improved their ability to forage for small prey. Additionally, alewives' gill- raker counts increased more rapidly as the adverse effects of narrow gill- raker spacings on foraging for large prey weremade less severe. For the first150- 250 years, alewives' growth decreased monotonically, and their gill- raker number increased monotonically. After the first 150-250 years, however, the alewives exhibited multiple evolutionary morphological trajectories in different trophic settings. In several of these settings, their evolutionary trajectories even reversed after the first 150-250 years. 

Conclusions: Alewives affected the abundance and morphology of their prey, which in turn changed the abundance and morphology of the alewives. Complex low-trophic-level interactions can alter the abundance and characteristics of alewives. This study suggests that the current morphology of recently (similar to 300 years)-landlocked alewives may not represent an evolutionarily stable state.

Place, publisher, year, edition, pages
BIOMED CENTRAL LTD, 2017
Keywords
Eco-evolution, Size-structured ecosystem, Individual-based model, Ecological power law, ntemporary evolution, Functional trait, Body size, Fish, Alewife
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-133527 (URN)10.1186/s12862-017-0912-4 (DOI)000397335900001 ()28241737 (PubMedID)
Available from: 2017-04-12 Created: 2017-04-12 Last updated: 2018-06-09Bibliographically approved
Berner, D. & Thibert-Plante, X. (2015). How mechanisms of habitat preference evolve and promote divergence with gene flow. Journal of Evolutionary Biology, 28(9), 1641-1655
Open this publication in new window or tab >>How mechanisms of habitat preference evolve and promote divergence with gene flow
2015 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 28, no 9, p. 1641-1655Article in journal (Refereed) Published
Abstract [en]

Habitat preference may promote adaptive divergence and speciation, yet the conditions under which this is likely are insufficiently explored. We use individual-based simulations to study the evolution and consequence of habitat preference during divergence with gene flow, considering four different underlying genetically based behavioural mechanisms: natal habitat imprinting, phenotype-dependent, competition-dependent and direct genetic habitat preference. We find that the evolution of habitat preference generally requires initially high dispersal, is facilitated by asymmetry in population sizes between habitats, and is hindered by an increasing number of underlying genetic loci. Moreover, the probability of habitat preference to emerge and promote divergence differs greatly among the underlying mechanisms. Natal habitat imprinting evolves most easily and can allow full divergence in parameter ranges where no divergence is possible in the absence of habitat preference. The reason is that imprinting represents a one-allele mechanism of assortative mating linking dispersal behaviour very effectively to local selection. At the other extreme, direct genetic habitat preference, a two-allele mechanism, evolves under restricted conditions only, and even then facilitates divergence weakly. Overall, our results indicate that habitat preference can be a strong reproductive barrier promoting divergence with gene flow, but that this is highly contingent on the underlying preference mechanism.

Place, publisher, year, edition, pages
John Wiley & Sons, 2015
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-108007 (URN)10.1111/jeb.12683 (DOI)000362591200006 ()
Available from: 2015-09-01 Created: 2015-09-01 Last updated: 2018-06-07Bibliographically approved
Nonaka, E., Svanbäck, R., Thibert-Plante, X., Englund, G. & Brännström, Å. (2015). Mechanisms by which phenotypic plasticity affects adaptive divergence and ecological speciation. American Naturalist, 186(5), E126-E143
Open this publication in new window or tab >>Mechanisms by which phenotypic plasticity affects adaptive divergence and ecological speciation
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2015 (English)In: American Naturalist, ISSN 0003-0147, E-ISSN 1537-5323, Vol. 186, no 5, p. E126-E143Article in journal (Refereed) Published
Abstract [en]

Phenotypic plasticity is the ability of one genotype to produce different phenotypes depending on environmental conditions. Several conceptual models emphasize the role of plasticity in promoting reproductive isolation and, ultimately, speciation in populations that forage on two or more resources. These models predict that plasticity plays a critical role in the early stages of speciation, prior to genetic divergence, by facilitating fast phenotypic divergence. The ability to plastically express alternative phenotypes may, however, interfere with the early phase of the formation of reproductive barriers, especially in the absence of geographic barriers. Here, we quantitatively investigate mechanisms under which plasticity can influence progress toward adaptive genetic diversification and ecological speciation. We use a stochastic, individual-based model of a predator-prey system incorporating sexual reproduction and mate choice in the predator. Our results show that evolving plasticity promotes the evolution of reproductive isolation under diversifying environments when individuals are able to correctly select a more profitable habitat with respect to their phenotypes (i.e., adaptive habitat choice) and to assortatively mate with relatively similar phenotypes. On the other hand, plasticity facilitates the evolution of plastic generalists when individuals have a limited capacity for adaptive habitat choice. We conclude that plasticity can accelerate the evolution of a reproductive barrier toward adaptive diversification and ecological speciation through enhanced phenotypic differentiation between diverging phenotypes.

Place, publisher, year, edition, pages
University of Chicago Press, 2015
Keywords
assortative mating, eco-evolutionary dynamics, ecological, speciation, habitat choice, individual-based model, phenotypic plasticity
National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-87677 (URN)10.1086/683231 (DOI)000363928900003 ()
Note

Originally published in thesis in manuscript form.

Available from: 2014-04-07 Created: 2014-04-07 Last updated: 2018-06-08Bibliographically approved
Thibert-Plante, X. & Gavrilets, S. (2013). Evolution of mate choice and the so-called magic traits in ecological speciation. Ecology Letters, 16(8), 1004-1013
Open this publication in new window or tab >>Evolution of mate choice and the so-called magic traits in ecological speciation
2013 (English)In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 16, no 8, p. 1004-1013Article in journal (Refereed) Published
Abstract [en]

Non-random mating provides multiple evolutionary benefits and can result in speciation. Biological organisms are characterised by a myriad of different traits, many of which can serve as mating cues. We consider multiple mechanisms of non-random mating simultaneously within a unified modelling framework in an attempt to understand better which are more likely to evolve in natural populations going through the process of local adaptation and ecological speciation. We show that certain traits that are under direct natural selection are more likely to be co-opted as mating cues, leading to the appearance of magic traits (i.e. phenotypic traits involved in both local adaptation and mating decisions). Multiple mechanisms of non-random mating can interact so that trait co-evolution enables the evolution of non-random mating mechanisms that would not evolve alone. The presence of magic traits may suggest that ecological selection was acting during the origin of new species.

Place, publisher, year, edition, pages
John Wiley & Sons, 2013
Keywords
Adaptation, evolution, ecological speciation, gene flow, magic traits, non-random mating, individual-based simulation
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-80806 (URN)10.1111/ele.12131 (DOI)000321696300006 ()
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2018-06-08Bibliographically approved
Liancourt, P., Choler, P., Gross, N., Thibert-Plante, X. & Tielbörger, K. (2012). How facilitation may interfere with ecological speciation. International Journal of Ecology, 2012(Special issue on Ecological Speciation), Article ID 725487
Open this publication in new window or tab >>How facilitation may interfere with ecological speciation
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2012 (English)In: International Journal of Ecology, ISSN 1687-9708, Vol. 2012, no Special issue on Ecological Speciation, p. Article ID 725487-Article in journal (Refereed) Published
Abstract [en]

Compared to the vast literature linking competitive interactions and speciation, attempts to understand the role of facilitation for evolutionary diversification remain scarce. Yet, community ecologists now recognize the importance of positive interactions within plant communities. Here, we examine how facilitation may interfere with the mechanisms of ecological speciation. We argue that facilitation is likely to (1) maintain gene flow among incipient species by enabling cooccurrence of adapted and maladapted forms in marginal habitats and (2) increase fitness of introgressed forms and limit reinforcement in secondary contact zones. Alternatively, we present how facilitation may favour colonization of marginal habitats and thus enhance local adaptation and ecological speciation. Therefore, facilitation may impede or pave the way for ecological speciation. Using a simple spatially and genetically explicit modelling framework, we illustrate and propose some first testable ideas about how, when, and where facilitation may act as a cohesive force for ecological speciation. These hypotheses and the modelling framework proposed should stimulate further empirical and theoretical research examining the role of both competitive and positive interactions in the formation of incipient species.

National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-80842 (URN)10.1155/2012/725487 (DOI)
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2018-06-08Bibliographically approved
Thibert-Plante, X. & Hendry, A. P. (2011). Factors influencing progress toward sympatric speciation. Journal of Evolutionary Biology, 24(10), 2186-2196
Open this publication in new window or tab >>Factors influencing progress toward sympatric speciation
2011 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 24, no 10, p. 2186-2196Article in journal (Refereed) Published
Abstract [en]

Many factors could influence progress towards sympatric speciation. Some of the potentially important ones include competition, mate choice and the degree to which alternative sympatric environments (resources) are discrete. What is not well understood is the relative importance of these different factors, as well as interactions among them. We use an individual-based numerical model to investigate the possibilities. Mate choice was modelled as the degree to which male foraging traits influence female mate choice. Competition was modelled as the degree to which individuals with different phenotypes compete for portions of the resource distribution. Discreteness of the environment was modelled as the degree of bimodality of the underlying resource distribution. We find that strong mate choice was necessary, but not sufficient, to cause sympatric speciation. In addition, sympatric speciation was most likely when the resource distribution was strongly bimodal and when competition among different phenotypes was intermediate. Even under these ideal conditions, however, sympatric speciation occurred only a fraction of the time. Sympatric speciation owing to competition on unimodal resource distributions was also possible, but much less common. In all cases, stochasticity played an important role in determining progress towards sympatric speciation, as evidenced by variation in outcomes among replicate simulations for a given set of parameter values. Overall, we conclude that the nature of competition is much less important for sympatric speciation than is the nature of mate choice and the underlying resource distribution. We argue that an increased understanding of the promoters and inhibitors of sympatric speciation is best achieved through models that simultaneously evaluate multiple potential factors.

National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-80807 (URN)10.1111/j.1420-9101.2011.02348.x (DOI)
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2018-06-08Bibliographically approved
Thibert-Plante, X. & Hendry, A. P. (2011). The consequences of phenotypic plasticity for ecological speciation. Journal of Evolutionary Biology, 24(2), 326-342
Open this publication in new window or tab >>The consequences of phenotypic plasticity for ecological speciation
2011 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 24, no 2, p. 326-342Article in journal (Refereed) Published
Abstract [en]

We use an individual-based numerical simulation to study the effects of phenotypic plasticity on ecological speciation. We find that adaptive plasticity evolves readily in the presence of dispersal between populations from different ecological environments. This plasticity promotes the colonization of new environments but reduces genetic divergence between them. We also find that the evolution of plasticity can either enhance or degrade the potential for divergent selection to form reproductive barriers. Of particular importance here is the timing of plasticity in relation to the timing of dispersal. If plasticity is expressed after dispersal, reproductive barriers are generally weaker because plasticity allows migrants to be better suited for their new environment. If plasticity is expressed before dispersal, reproductive barriers are either unaffected or enhanced. Among the potential reproductive barriers we considered, natural selection against migrants was the most important, primarily because it was the earliest-acting barrier. Accordingly, plasticity had a much greater effect on natural selection against migrants than on sexual selection against migrants or on natural and sexual selection against hybrids. In general, phenotypic plasticity can strongly alter the process of ecological speciation and should be considered when studying the evolution of reproductive barriers.

Keywords
adaptive divergence, adaptive radiation, divergent selection, gene flow, individual-based modelling, selection against hybrids, selection against migrants
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-80840 (URN)10.1111/j.1420-9101.2010.02169.x (DOI)000286208400010 ()
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2018-06-08Bibliographically approved
Reardon, E. E. & Thibert-Plante, X. (2010). Optimal offspring size influenced by the interaction between dissolved oxygen and predation pressure. Evolutionary Ecology Research, 12(3), 377-387
Open this publication in new window or tab >>Optimal offspring size influenced by the interaction between dissolved oxygen and predation pressure
2010 (English)In: Evolutionary Ecology Research, ISSN 1522-0613, E-ISSN 1937-3791, Vol. 12, no 3, p. 377-387Article in journal (Refereed) Published
Abstract [en]

Question: How does optimal size at the beginning of the juvenile stage vary with dissolved oxygen and aquatic predator pressure?

Mathematical methods: An implicit model based on earlier offspring size and number optimality models, using empirical observations to motivate and interpret the results.

Key assumptions: A stable, density-independent system with high parental care that maximizes maternal fitness, with respect to offspring size and number.

Predictions: The model predicts a positive relationship between juvenile size and aquatic dissolved oxygen, with respect to maternal fitness and predation pressure. This prediction is based on observations in the literature that smaller fish are less sensitive to low dissolved oxygen and may use low dissolved oxygen habitats as predator refuges.

Keywords
body size, fish, hypoxia, implicit derivation model, predator–prey
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-80809 (URN)
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2018-06-08Bibliographically approved
Crispo, E., DiBattista, J. D., Correa, C., Thibert-Plante, X., McKellar, A. E., Schwartz, A. K., . . . Hendry, A. P. (2010). The evolution of phenotypic plasticity in response to anthropogenic disturbance. Evolutionary Ecology Research, 12(1), 47-66
Open this publication in new window or tab >>The evolution of phenotypic plasticity in response to anthropogenic disturbance
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2010 (English)In: Evolutionary Ecology Research, ISSN 1522-0613, E-ISSN 1937-3791, Vol. 12, no 1, p. 47-66Article in journal (Refereed) Published
Abstract [en]

Questions: Do evolutionary changes in phenotypic plasticity occur after anthropogenic disturbance? Do these changes tend to be increases or decreases in plasticity? How do these evolutionary patterns differ among taxa and trait types? Does evolution of plasticity change with time since the disturbance?

Data incorporated: Evolutionary rates for plasticity estimated from 20 studies that have compared a plastic response in two or more populations, at least one of which had experienced an anthropogenic disturbance in nature and at least one of which had not.

Method of analysis: We estimate evolutionary rates (darwins and haldanes) for plasticity for each study, which represent the amount of evolutionary change in plasticity. We then perform analyses of covariance, with the evolutionary rate numerator (amount of evolutionary change) as a response variable, taxa and trait type as predictor variables, and the amount of evolutionary time as a covariate.

Conclusions:We find that plasticity has evolved in several cases, including both increases and decreases in the levels of plasticity following anthropogenic disturbances. The typical direction of this evolutionary response depends on an interaction between taxon and trait type. For instance, invertebrates sometimes show the evolution of increased  plasticity for life-history traits, but the evolution of decreased plasticity for morphological traits. Plants, on the other hand, show no trends in the direction of plasticity evolution.

Place, publisher, year, edition, pages
Tucson, AZ, USA: Evolutionary Ecology Ltd, 2010
Keywords
adaptation, adaptive plasticity, climate change, contemporary evolution, human impact, meta-analysis, rapid evolution, reaction norms
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:umu:diva-80810 (URN)000276475900004 ()
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2018-06-08Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3982-0829

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