A5036371914- Aquatic Ecosystems and Phytoplankton Dynamics
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Freshwater macroinvertebrate diversity and ecology
- Environmental DNA in Biodiversity Studies
- Geology and Paleoclimatology Research
- Water Quality and Pollution Assessment
- Land Use and Ecosystem Services
- Coastal wetland ecosystem dynamics
- Genomics and Phylogenetic Studies
- Aquatic Invertebrate Ecology and Behavior
- Isotope Analysis in Ecology
- Aquatic Ecosystems and Biodiversity
- Bacteriophages and microbial interactions
- Marine and fisheries research
- Environmental Toxicology and Ecotoxicology
- Identification and Quantification in Food
- Protist diversity and phylogeny
- Heavy Metal Exposure and Toxicity
- Peatlands and Wetlands Ecology
- Mercury impact and mitigation studies
- Ecology and Vegetation Dynamics Studies
- Soil erosion and sediment transport
Environment and Climate Change Canada
2019-2024
McGill University
2008-2023
Laboratoire Interuniversitaire de Biologie de la Motricité
2023
GDG Environnement
2019-2022
Université de Montréal
2016-2020
University of Ottawa
2017-2019
Increases in atmospheric temperature and nutrients from land are thought to be promoting the expansion of harmful cyanobacteria lakes worldwide, yet date there has been no quantitative synthesis long-term trends. To test whether have increased abundance over past ~ 200 years evaluate relative influence potential causal mechanisms, we synthesised 108 highly resolved sedimentary time series 18 decadal-scale monitoring records north temperate-subarctic lakes. We demonstrate that: (1)...
Abstract There is growing concern that harmful cyanobacterial blooms are increasing in frequency and occurrence around the world. Although nutrient enrichment commonly identified as a key predictor of abundance dominance freshwaters, several studies have shown variables related to climate change can also play an important role. Based on our analysis literature, we hypothesized temperature or water‐column stability will be primary drivers stratified lakes whereas nutrients stronger predictors...
Abstract Agriculturally driven changes in soil phosphorus ( P ) are known to have persistent effects on local ecosystem structure and function, but regional patterns of recovery following cessation agriculture less well understood. We synthesized data from 94 published studies assess evidence these land‐use legacies throughout the world by comparing labile total content abandoned agricultural areas that reference ecosystems or sites remaining agriculture. Our meta‐analysis shows was...
Enhanced phosphorus (P) export from land into streams and lakes is a primary factor driving the expansion of deep-water hypoxia in during Anthropocene. However, interplay regional scale environmental stressors lack long-term instrumental data often impede analyses attempting to associate changes cover with downstream aquatic responses. Herein, we performed synthesis that link paleolimnological reconstructions lake bottom-water oxygenation cover/use climate over past 300 years evaluate...
Stunting, a severe and multigenerational growth impairment, globally affects 22% of children under the age 5 years. Stunted have altered gut bacterial communities with higher proportions Proteobacteria, phylum several known human pathogens. Despite links between an microbiota stunting, role bacteriophages, highly abundant viruses, is unknown. Here, we describe bacteriophage Bangladeshi stunted younger than 38 months. We show that these harbor distinct bacteriophages relative to their...
Abstract Aim Scientists, governments and non‐governmental organizations are increasingly moving towards the collection of large, open‐access data. In aquatic sciences, this effort is expanding scope questions analyses that can be performed to further our knowledge global drivers water quality. Cyanotoxin concentration one variable has received considerable attention, although strong local‐scale models have been described in literature, modelling cyanotoxin concentrations across broader...
The Northwest Atlantic cod stocks collapsed in the early 1990s and have yet to recover, despite subsequent establishment of a continuing fishing moratorium. Efforts understand collapse lack recovery so far focused mainly on dynamics commercially harvested species. Here, we use data from 33-year scientific trawl survey determine which degree signatures are apparent spatial temporal broader groundfish community. Over this period, community experienced four phases change: (i) period rapid,...
In response to the coronavirus (COVID-19) pandemic, there has been an increased need for personal and environmental decontamination aid in curbing transmission of SARS-CoV-2 virus. Products used this purpose include sanitizers hands disinfectants surfaces. The active chemical ingredients these products, termed antimicrobials, can enter waste streams after application may be emerging as more prominent contaminants. Even prior COVID-19, was recognized examine their implications aquatic biota,...
Understanding the environmental conditions and taxa that promote occurrence of cyanobacterial toxins is imperative for effective management lake ecosystems. Herein, we modeled total microcystin presence concentrations with a broad suite predictors cyanobacteria community data collected across 440 Canadian lakes using standardized methods. We also conducted focused analysis targeting 14 congeners 190 lakes, to examine how abiotic biotic factors influence their relative proportions....
Abstract The development of cyanobacteria blooms is increasing concern in many lakes worldwide, and as a result, modeling their predictors vital for understanding where why they occur. In this study, we developed analyzed 640‐lake data set that spans Canada 12 ecozones to identify the drivers biomass several key toxin‐ bloom‐forming genera ( Microcystis , Aphanizomenon Dolichospermum ). database consisted an exhaustive list potential n = 55), including water chemistry, land‐use, zooplankton...
Abstract Cyanobacterial harmful algal blooms (cyanoHABs) are assumed to be increasing in abundance and toxicity, but comprehensive analysis of change through time is limited, part, because some key taxa (e.g., Microcystis ) leave ambiguous evidence historical toxicity. Sedimentary DNA ( sed DNA) can allow the reconstruction cyanobacteria community as well frequency genes specific cyanotoxin production, enabling us determine which present their potential for toxin‐production. Using a...
Abstract BACKGROUND Bordeaux mixture is a copper‐based fungicide commonly used in vineyards to prevent fungal and bacterial infections grapevines. However, this may adversely affect the entomological component, including insect pests. Understanding impacts of on vineyard pest Lobesia botrana an increasing concern viticultural production. RESULTS had detrimental effects development reproductive performance L. . Several physiological traits were affected by exposure, decrease larval survival...
Phages, viruses that infect bacteria, are often seen as key players in bacterial community dynamics and the ecosystem services those communities support. However, much of our understanding phage-bacteria interactions comes from vitro studies, which provide limited insights into how these occur natural environments. In this study, we used cyanobacterial blooms a model microbial to evaluate potential role phages driving populations. These characterized by massive usually rapid accumulation...
Background A hallmark of the latter half 20th century is widespread, rapid intensification a variety anthropogenically-driven environmental changes—a "Great Acceleration." While there evidence Great Acceleration in factors known to be linked water quality degradation, such as conversion land agriculture and fertilizer use, it not whether has been similar acceleration freshwater eutrophication. Methodology/Principal Findings Using quantitative reconstructions diatom-inferred total phosphorus...
African tropical lakes provide vital ecosystem services including food and water to some of the fastest growing human populations, yet they are among most understudied ecosystems in world. The consequences climate change other stressors on Africa have been informed by long-term analyses, but these studies largely focused massive Great Rift Valley lakes. Our objective was evaluate how recent has altered functioning smaller lakes, which far more abundant landscape. Based a paired analysis 20...
Freshwater ecosystems are threatened by multiple anthropogenic stressors acting over different spatial and temporal scales, resulting in toxic algal blooms, reduced water quality hypoxia. However, while catchment characteristics act as a 'filter' modifying lake response to disturbance, little is known of the relative importance drivers possible differentiation upland remote lakes comparison lowland, impacted lakes. Moreover, many studies have focussed on single rather than looking at...
Abstract Nonlinear responses to changing external pressures are increasingly studied in real‐world ecosystems. However, as many of the changes observed by ecologists extend beyond monitoring record, occurrence critical transitions, where system is pushed from one equilibrium state another, remains difficult detect. Paleo‐ecological records thus represent a unique opportunity expand our temporal perspective consider regime shifts and whether such events exception rather than rule. Yet,...
Bacterial communities are composed of distinct groups potentially interacting lineages, each thought to occupy a ecological niche. It remains unclear, however, how quickly niche preference evolves and whether more closely related lineages likely share niches. We addressed these questions by following the dynamics two bloom-forming cyanobacteria genera over an 8-year time-course in Lake Champlain, Canada, using 16S amplicon sequencing measurements several environmental parameters. The genera,...
Abstract Atrazine contamination is ubiquitous in North American surface waters, but the dependency of herbicide's distribution on landscape and within‐lake processes currently poorly known. We sought to identify novel predictors atrazine build a coherent framework model its concentration waterbodies through development binomial‐gamma hurdle models LASSO regression models. constructed for over 900 contiguous United States using data from 2012 U.S. EPA National Lake Assessment, Department...
Biodiversity loss has accelerated over the past century and freshwater species overall are among those experiencing greatest declines. Genetic resources have potential to help evaluate full magnitude of this represent a key tool effectively allocate conservation monitor success restoration efforts. The power genetic will be realized when daunting task referencing all DNA sequences organisms is complete. Here, we quantified availability distribution barcode genome data for macroscopic in...
Abstract Aim We aimed to measure the dominant spatial patterns in ecosystem properties (such as nutrients and measures of primary production) multi‐scaled geographical driver variables these quantify how structure pattern all influences strength relationships among them. Location time period studied > 8,500 lakes a 1.8 million km 2 area Northeast U.S.A. Data comprised 10‐year medians (2002–2011) for measured properties, long‐term climate averages recent land use/land cover variables....