Marc J. Lajeunesse

ORCID: 0000-0002-9678-2080
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About
Contact & Profiles
Research Areas
  • Plant and animal studies
  • Ecology and Vegetation Dynamics Studies
  • Species Distribution and Climate Change
  • Data Analysis with R
  • Plant Parasitism and Resistance
  • Meta-analysis and systematic reviews
  • Mycorrhizal Fungi and Plant Interactions
  • Animal Behavior and Reproduction
  • Insect-Plant Interactions and Control
  • Parasite Biology and Host Interactions
  • Fish Ecology and Management Studies
  • Evolution and Paleontology Studies
  • Wildlife Ecology and Conservation
  • Ichthyology and Marine Biology
  • Digital Games and Media
  • Insect and Arachnid Ecology and Behavior
  • Evolution and Genetic Dynamics
  • Marine and coastal ecosystems
  • Avian ecology and behavior
  • Viral Infections and Vectors
  • Image Processing and 3D Reconstruction
  • Fish biology, ecology, and behavior
  • Agriculture, Soil, Plant Science
  • Ecology and Conservation Studies
  • Insect and Pesticide Research

University of South Florida
2015-2024

John Wiley & Sons (United States)
2020

Concordia University
2020

Ecological Society of America
2020

National Evolutionary Synthesis Center
2009-2011

Cornell University
2005-2009

Carleton University
2002-2003

Summary 1. Although secondary metabolites are recognized as fundamental to the defence of plants against insect and mammalian herbivores, their relative importance compared other potential defensive plant traits (e.g. physical resistance, gross morphology, life‐history, primary chemistry physiology) not well understood. 2. We conducted a meta‐analysis answer question: What types genetically variable most strongly predict resistance herbivores? performed comprehensive literature search...

10.1111/j.1365-2435.2010.01794.x article EN Functional Ecology 2010-10-13

Summary Meta‐analysis and meta‐regression are statistical methods for synthesizing modelling the results of different studies, critical research synthesis tools in ecology evolutionary biology (E&E). However, many E&E researchers carry out meta‐analyses using software that is limited its functionality not easily updatable. It likely these limitations have slowed uptake new scope quality inferences from syntheses. We developed OpenMEE: Open Meta‐analyst Ecology Evolution to address...

10.1111/2041-210x.12708 article EN publisher-specific-oa Methods in Ecology and Evolution 2016-11-29

A common effect size metric used to quantify the outcome of experiments for ecological meta-analysis is response ratio (RR): log proportional change in means a treatment and control group. Estimates variance RR are also important because they serve as weights when sizes averaged compared. The an typically function sampling error; however, it can be influenced by study design. Here, I derive new variances covariances several often-encountered experimental designs: correlated; multiple...

10.1890/11-0423.1 article EN Ecology 2011-07-14

Abstract Soil respiration ( R s ) is the second‐largest terrestrial carbon (C) flux. Although has been extensively studied across a broad range of biomes, there surprisingly little consensus on how spatiotemporal patterns will be altered in warming climate with changing precipitation regimes. Here, we present global synthesis data from studies that have manipulated field by collating 113 increased treatments, 91 decreased and 14 prolonged drought treatments. Our meta‐analysis indicated when...

10.1111/gcb.13156 article EN Global Change Biology 2015-11-11

Summary The r package ecosystem is rich in tools for the statistics of meta‐analysis. However, there are few resources available to facilitate research synthesis as a whole. Here, I present metagear . It comprehensive, multifunctional toolbox with capabilities aimed cover much taxonomy: from applying systematic review approach objectively assemble and screen literature, extracting data studies, finally summarize analyse these Current functionalities include following: an abstract screener...

10.1111/2041-210x.12472 article EN Methods in Ecology and Evolution 2015-09-05

Ecologists widely use the log response ratio for summarizing outcomes of studies meta-analysis. However, little is known about sampling distribution this effect size estimator. Here I show with a Monte Carlo simulation that biased when quantifying outcome small sample sizes, and can yield erroneous variance estimates scale study parameters are near zero. Given these challenges, derive compare two new estimators help correct small-sample bias, update guidelines diagnostics assessing...

10.1890/14-2402.1 article EN Ecology 2015-05-11

Recent developments in ecological statistics have reached behavioral ecology, and an increasing number of studies now apply analytical tools that incorporate alternatives to the conventional null hypothesis testing based on significance levels. However, these approaches continue receive mixed support our field. Because statistical choices can influence research design interpretation data, there is a compelling case for reaching consensus philosophy practice. Here, we provide brief overview...

10.1093/beheco/arp137 article EN Behavioral Ecology 2009-01-01

Most plants engage in symbioses with mycorrhizal fungi soils and net consequences for vary widely from mutualism to parasitism. However, we lack a synthetic understanding of the evolutionary ecological forces driving such variation this or any other nutritional symbiosis. We used meta-analysis across 646 combinations show that history explains substantially more plant responses than factors included study, as nutrient fertilization additional microbes. Evolutionary also has different...

10.1038/s42003-018-0120-9 article EN cc-by Communications Biology 2018-08-10

Abstract Variable reporting of results can influence quantitative reviews by limiting the number studies for analysis, and thereby influencing both type analysis scope review. We performed a Monte Carlo simulation to determine statistical errors three meta‐analytical approaches related how such were affected numbers constituent studies. Hedges’ d effect sizes based on item response theory (IRT) had similarly improved error rates with increasing when there was no true effect, but IRT...

10.1046/j.1461-0248.2003.00448.x article EN Ecology Letters 2003-04-14

Abstract A central assumption in ecological immunology is that immune responses are costly, with costs manifesting directly (e.g., increases metabolic rate and increased amino acid usage) or as tradeoffs other life processes reduced growth reproductive success). Across taxa, host longevity, timing of maturity, effort affect the organization systems. It reasonable, therefore, to expect these related factors should also activation costs. Specifically, species spread their breeding efforts over...

10.1002/jez.2084 article EN Journal of Experimental Zoology Part A Ecological and Integrative Physiology 2017-06-01

Abstract A tremendous diversity of plants exude sticky and toxic latex upon tissue damage, its production has been widely studied as a defensive adaptation against insect herbivores. Here, we address variation in constituent chemical properties (cardenolides cysteine proteases) 53 milkweeds [ Asclepias spp. (Apocynaceae)], employing phylogenetic approach to test macroevolutionary hypotheses defense evolution. Species were highly variable for all three traits, they showed little evidence...

10.1111/j.1570-7458.2008.00690.x article EN Entomologia Experimentalis et Applicata 2008-05-19

Sex‐biased dispersal is well known for birds and mammals, typically by females males, respectively. Little about general patterns of sex‐biased in other animal taxa. We reviewed return rates a model group invertebrates (damselflies) explored putative costs benefits males females. used published capture–mark–recapture data examined whether sex bias existed likelihood recapture at least once, both emergence and/or breeding sites. assessed this metric was indicative or philopatry, any emerging...

10.1111/j.2006.0030-1299.14391.x article EN Oikos 2006-02-16

Abstract Aim Theory suggests that introduced species are phylogenetically distant from their recipient communities should be more successful than closely related because they can exploit open niches and escape enemies in new range, i.e. Darwin’s Naturalization Hypothesis. Alternatively, it has also been hypothesized invaders might novel pre‐adapted to conditions range; a paradox coined Conundrum. To date, these hypotheses have tested primarily at the regional scale, not within local plant...

10.1111/j.1472-4642.2011.00806.x article EN other-oa Diversity and Distributions 2011-06-20
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