A5045051068- Fish Ecology and Management Studies
- Isotope Analysis in Ecology
- Marine and fisheries research
- Plant and animal studies
- Ecosystem dynamics and resilience
- Insect and Arachnid Ecology and Behavior
- Species Distribution and Climate Change
- Evolutionary Game Theory and Cooperation
- Animal Behavior and Reproduction
- Physiological and biochemical adaptations
- Sustainability and Ecological Systems Analysis
- Animal Ecology and Behavior Studies
- Ecology and Vegetation Dynamics Studies
- Coastal and Marine Management
- Land Use and Ecosystem Services
- Aquatic Invertebrate Ecology and Behavior
- Organic Food and Agriculture
- Marine and Offshore Engineering Studies
- Marine Bivalve and Aquaculture Studies
- Science and Climate Studies
- Mercury impact and mitigation studies
- Marine and coastal ecosystems
- Avian ecology and behavior
- Diverse Historical and Scientific Studies
- Evolution and Genetic Dynamics
Fisheries and Oceans Canada
2018-2025
University of Guelph
2012-2024
Wild Salmon Center
2020
University of Wisconsin–Madison
2016-2019
Hólar University College
2012
University of Iceland
2012
Increases in the frequency, severity and duration of temperature extremes are anticipated near future. Although recent work suggests that changes variation will have disproportionately greater effects on species than to mean, much climate change research ecology has focused impacts mean change. Here, we couple fine-grained projections (2050-2059) thermal performance data from 38 ectothermic invertebrate contrast with those a simple model. We show based alone differ substantially...
Changing temperature can substantially shift ecological communities by altering the strength and stability of trophic interactions. Because many rates are constrained temperature, new approaches required to understand how simultaneous changes in multiple alter relative performance species their We develop an energetic approach identify relationship between biomass fluxes standing across levels. Our links dynamics measure temperature-dependent interactions determine these food web stability....
Trophic cascades are indirect positive effects of predators on resources via control intermediate consumers. Larger-bodied appear to induce stronger trophic (a greater rebound resource density toward carrying capacity), but how this happens is unknown because we lack a clear depiction the strength determined. Using consumer models, first show that cascade has an upper limit set by interaction between basal group and its approached as predator increases. We then express explicitly in terms...
Abstract Aquatic ecosystems support size structured food webs, wherein predator‐prey body sizes span orders of magnitude. As such, these webs are replete with extremely generalized feeding strategies, especially among the larger bodied, higher trophic position taxa. The movement scale aquatic organisms also generally increases and position. Together, size, mobility, foraging relationships suggest that lower in web generate relatively distinct energetic pathways by over smaller spatial areas....
Abstract The Safe Operating Space ( SOS ) of a recreational fishery is the multidimensional region defined by levels harvest, angler effort, habitat, predation and other factors in which sustainable into future. boundaries exhibit trade‐offs such that decreases harvest can compensate to some degree for losses increases increasing value fishing time anglers. Conversely, high be sustained if habitat intact, low, effort moderate. approach recognizes limits several dimensions: at overly loss,...
Significance Organisms may adjust their behavior to stay cool as natural habitats differentially warm with rising air temperature. Undoubtedly, fundamental ecosystem properties will change in turn, but the impact of dynamic thermal mosaic on food web interactions is not considered traditional climate research. To demonstrate differential warming effects webs, we use boreal lakes show that energy pathways leading an apex predator shift, according preference, and vertical pathway lengthened...
Abstract Fisheries and human dimensions literature suggests that climate change influences inland recreational fishers in North America through three major pathways. The most widely recognized pathway impacts habitat fish populations (e.g., water temperature impacting survival) cascades to impact fishers. Climate also by influencing environmental conditions directly affect increased temperatures northern climates resulting extended open fishing seasons effort). final occurs from mitigation...
Abstract The tidal freshwater zone is an aquatic transition that links a river to its estuary and provides important habitat used in the life cycle of resident migratory fishes. Yet, information on trophic structure fishes this scarce. To address gap, we characterize fish community Northwest Miramichi River (New Brunswick, Canada). Stable isotope analyses (δ 13 C, δ 15 N, 34 S) 17 species revealed diverse feeding strategies. Resource use varied across species; some relied either marine or...
Abstract Despite long‐standing interest in foraging modes as an important element of animal space use, few studies document and compare individual mode differences among species ecological conditions the wild. We observed compared 61 wild A rctic charr, S alvelinus alpinus , 42 brown trout, almo trutta, 50 Atlantic salmon, salar, their first growing season over a range habitats 10 Icelandic streams. found that although stream salmonids typically sit‐and‐wait to ambush prey from short...
Structural habitat (the three-dimensional arrangement of physical matter, abiotic and biotic, at a location) is foundational element for the resilience maintenance biodiversity, yet anthropogenic development driving global simplification aquatic environments. Resource managers regularly seek to conserve food webs by increasing structural complexity with expected benefits fisheries; however, effectiveness such actions unclear. Our synthesis theoretical analyses found that response...
Abstract Regime shifts (periods of rapid change punctuating longer periods lower variability) are observed in a wide range ecosystems, and effective fisheries management requires the ability to detect these shifts. Detecting is straightforward single-species time series when transitions detectable as change. However, complex spatially structured communities may be harder detect. We propose an approach characterize community regime shifts, using nonparametric spatiotemporal regression models...
As climate change transforms marine environments globally, species distributions correspondingly shift to locations where conditions have become or remain favourable. The ability model these distributional shifts has been facilitated by distribution models (SDMs). However, current SDM approaches largely ignored climate‐driven changes in interactions, which ultimately can an important influence on distributions. In this study, we utilize a long‐term, large‐scale dataset spanning 48 years and...
Abstract Species richness is regulated by a complex network of scale-dependent processes. This complexity can obscure the influence limiting species interactions, making it difficult to determine if abiotic or biotic drivers are more predominant regulators richness. Using integrative modeling freshwater fish from 721 lakes along an 11 o latitudinal gradient, we find negative interactions be relatively minor independent predictor in despite widespread presence predators. Instead, interaction...
Earth's surface temperatures are projected to increase by ~1-4°C over the next century, threatening future of global biodiversity and ecosystem stability. While this has fueled major progress in field physiological trait responses warming, it is currently unclear whether routine population monitoring data can be used predict temperature-induced collapse. Here, we integrate performance theory with that critical tipping points test early warning signals reliably anticipate thermally induced...
Effective management of freshwater fish habitat is essential to supporting healthy aquatic ecosystems and sustainable fisheries. In Canada, recent changes the Fisheries Act enhanced protection habitat, but application those provisions relies on sound scientific evidence. We employed collaborative research prioritization methods identify questions that, if addressed, would significantly advance in Canada. This list was generated by a diverse group experts, including substantial contributions...
Climate change is asymmetrically altering environmental conditions in space, from local to global scales, creating novel heterogeneity. Here, we argue that this heterogeneity will drive mobile generalist consumer species rapidly respond through their behavior ways broadly and predictably reorganize—or rewire—food webs. We use existing theory data diverse ecosystems show the rapid behavioral responses of generalists climate rewire food webs two distinct critical ways. Firstly, are...
Predicting species responses to perturbations is a fundamental challenge in ecology. Decision makers must often identify management that are the most likely deliver desirable outcome despite incomplete information on pattern and strength of food web links. Motivated by current fishery decline inland lakes Midwestern United States, we evaluate consistency target (walleye [Sander vitreus]) press perturbations. We represented uncertainty with 193 plausible topological models applied four each...
Abstract Predation can be a significant source of natural mortality for small pelagic fish species, rivaling or exceeding fishery removals. Failure to account changes in introduce uncertainty the assessment and management these stocks. In this study, 10‐year span hydroacoustic data was used detect Bluefin Tuna Thunnus thynnus on two major fall spawning grounds Atlantic Herring Clupea harengus , an economically ecologically valuable forage species southern Gulf St. Lawrence (sGSL). Average...