A5068823550- Marine and fisheries research
- Marine animal studies overview
- Fish Ecology and Management Studies
- Avian ecology and behavior
- Coral and Marine Ecosystems Studies
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Marine Bivalve and Aquaculture Studies
- Marine Biology and Ecology Research
- Animal Behavior and Reproduction
- Genetic and phenotypic traits in livestock
- Genetic diversity and population structure
- Neuroendocrine regulation and behavior
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Animal Vocal Communication and Behavior
- Wildlife Ecology and Conservation
- Isotope Analysis in Ecology
- Ichthyology and Marine Biology
- Reproductive biology and impacts on aquatic species
- Genetics, Aging, and Longevity in Model Organisms
- Identification and Quantification in Food
- Maritime Navigation and Safety
- Evolutionary Psychology and Human Behavior
- Aquatic Ecosystems and Phytoplankton Dynamics
- Crustacean biology and ecology
Fisheries and Oceans Canada
2016-2025
Government of Canada
2025
Bedford Institute of Oceanography
2015-2024
NOAA National Marine Fisheries Service Pacific Islands Fisheries Science Center
2022
National Oceanic and Atmospheric Administration
2022
University of Alaska Fairbanks
2022
Ecological Society of America
2020
John Wiley & Sons (United States)
2020
Dalhousie University
2009-2019
Ecosystem Sciences
2019
Organic matter mineralization rates were measured by the accumulation of DIC + CH 4 in water overlying intact cores taken from littoral and protimdal sediments nine Quebec lakes. The variability areal carbon is much greater within lakes than among varying trophic richness. more variable and, on average, threefold higher profundal sediments. Sixty percent variation mean summer explained site depth, a surrogate that incorporates effect temperature may also be reflecting substrate quality...
Abstract Offspring size affects survival and subsequent reproduction in many organisms. However, studies of offspring large mammals are often limited to effects on juveniles because the difficulty following individuals maturity. We used data from a long‐term study individually marked gray seals ( H alichoerus grypus ; Fabricius, 1791) test hypothesis that larger have higher recruitment more successful primiparous mothers than smaller offspring. Between 1998 2002, 1182 newly weaned female...
Abstract The northwest Atlantic subspecies of gray seal ( Halicheorus grypus ) has been increasing for more than a half century and reestablished breeding colonies in Canadian US waters. In 2016, visual, oblique, vertical large‐format digital photographic surveys were conducted at all known the Atlantic. Total pup production was estimated to be 109,000 SE = 17,500) pups. At 87,500 15,100) pups, Sable Island accounts 80% total production. Regional differences trends are evident. Pup Gulf St....
Abstract Changes in the genetic mechanisms that control sexual determination have occurred independently across tree of life, and with exceptional frequency teleost fishes. To investigate genomic changes underlying evolution determination, we sequenced a chromosome‐level genome, multitissue transcriptomes, reduced representation population data for Atlantic halibut ( Hippoglossus hippoglossus ), which has an XY/XX sex mechanism recently diverged (0.9–3.8 Ma) from Pacific stenolepis ZZ/ZW...
Abstract Characterizing the nature of genetic differentiation among individuals and populations its distribution across genome is increasingly important to inform both conservation management exploited species. Atlantic Halibut (Hippoglossus hippoglossus) an ecologically commercially fish species, yet knowledge population structure genomic diversity in this species remains lacking. Here, we use restriction-site associated DNA sequencing a chromosome-level assembly identify over 86 000 single...
Interactions between spatial dynamics and stock structure in marine fishes have largely focused on stocks decline; is rarely re-visited for expanding species. Here, the ecology of Atlantic halibut (Hippoglossus hippoglossus L.), managed as four Northwest Atlantic, reviewed. Halibut collapsed under high exploitation mid-19th century, but Canadian fisheries value has increased seven-fold since early 2000s. halibut's thermal habitat due to warming, possibly contributing its expansion. Genomic...
Abstract The recovery of marine mammal populations has led to increased predation on commercially valuable prey species, creating conflicts with fisheries and calls for predator control. Grey seals are important predators Atlantic Cod Winter Skate in the southern Gulf St. Lawrence (sGSL), both species likely be extirpated unless grey seal presence that ecosystem is strongly reduced. We aimed identify harvest strategies reduced sGSL levels favour fish while maintaining conservation goals. fit...
Abstract In the early 1990s, Northwest Atlantic Ocean underwent a fisheries‐driven ecosystem shift. Today, iconic cod ( Gadus morhua ) remains at low levels, while halibut Hippoglossus hippoglossus has been increasing since mid‐2000s, concomitant with interest from fishing industry. Currently, our knowledge about ecology is limited, and lack of recovery in other collapsed groundfish populations highlighted danger overfishing local concentrations. Here, we apply Bayesian hierarchical...
Abstract We investigated conflicting perspectives over a transboundary species (Atlantic Halibut-Hippoglossus hippoglossus L.) assumed to be one population spanning the border separating USA and Canada. In Canada, fishery is certified as sustainable by international Marine Stewardship Council (2013). USA, that same listed “Species of Concern” under US Endangered Species Act (1973). There are fishery-independent trawl surveys conducted both Canada on juvenile halibut abundance across border....
Abstract Fishing mortality and natural rates for Atlantic Halibut Hippoglossus hippoglossus on the Scotian Shelf southern Grand Banks were estimated from a multiyear tagging study. Models that used to estimate incorporated tag loss. Between 2006 2008, 1,913 double‐tagged with t‐bar anchor tags; as of 26 August 2010, 368 these fish had been recaptured. We instantaneous fishing ( F ) separately each cohort in first year (on average, 6 months) after release allow newly tagged animals mix...
The NAFO divisions 3NOPs4VWX5Zc Atlantic halibut (Hippoglossus hippoglussus L.) stock is managed over a large spatial scale, spanning 20° of longitude and 6° latitude.Previous studies have shown that female in the warmer southern area mature at sizes 10-20 cm smaller than colder north.Our goal was to examine role growing degree-day (GDD, number days X temperature °C above minimum threshold) on growth rate length maturity (LM50%).Two separate datasets, associated with stock-wide DFO-Industry...
Abstract Change in breeding phenology is often a response to environmental forcing, but less known of the mechanism underlying such changes and their fitness consequences. Here, we report on from 27‐year longitudinal study (1991–2017) individually marked, known‐aged grey seals ( Halichoerus grypus ) Sable Island, Nova Scotia, Canada. We used generalized linear mixed models 3‐step process develop model that includes interactions between intrinsic extrinsic covariates test hypotheses about...
An individual's size in early stages of life may be an important source individual variation lifetime reproductive performance, as effects on ontogenetic development can have cascading physiological and behavioral consequences throughout life. Here, we explored how size-at-young influences subsequent performance gray seals (
Abstract Few studies have examined the impacts of externally fitted data‐loggers and telemetry tags on pinnipeds. We tested for instrument effects body mass lactating female gray seals their offspring probability pupping in next breeding season. Known‐age adult females ( n = 216) were with instruments winter, spring, fall from 1992 to 2018 at Sable Island, Nova Scotia. Of those tagged spring fall, 61 135 returning 59 weighed within 5 days postpartum 79 pups weaning. Instrumented assigned...
Abstract The recovery of many groundfish stocks in the Northwest Atlantic has been impeded by elevated mortality among older/larger individuals. sources are generally uncertain, though predation growing grey seal herds and unreported fishing thought to be drivers for cod (Gadus morhua) on Western Scotian Shelf Bay Fundy (4X5Y), as well nearby ecosystems. We developed a statistical catch-at-age model 4X5Y that accounted bycatch/discards tested across broad range consumption discard scenarios....
Individual variation in reproductive ability is a key component of natural selection within populations, driving the evolution life histories and population responses to changing environmental conditions. Evidence that density affects individual-level fitness wild populations limited, particularly for long-lived animals, which are difficult observe on biologically relevant scale. We tested individual heterogeneity performance female grey seals (Halichoerus grypus) using 35 yr mark-resighting...
With the influence of climate change on marine systems expanding, adaptation will be fundamental for future fisheries management. An exponential increase in Atlantic halibut Hippoglossus hippoglossus landings over past decade has coincided with warming ocean temperatures. Here, we explore how historical changes abundance have been linked to changing thermal habitat conditions and project trends a under different emissions scenarios. From 1990 2018, available increased by 11.6 ± 7.35% growing...
Abstract Selection of birth‐site habitat can have important effects on the reproductive success females and survival offspring. We studied selection by gray seals ( Halichoerus grypus ) Sable Island, Nova Scotia, associated effect offspring body mass at weaning. identified a mosaic eight habitats using orthorectified imagery from photographic aerial survey conducted in January 2016. The distribution birth sites 814 2014–2016 compared to available 2016 provided evidence for positive that were...
We tested the hypothesis that American lobster ( Homarus americanus ) movement can be described as diffusion. In 2001 and 2002, 3689 lobsters, captured by experimental trap trawl surveys, were tagged released in Northumberland Strait, Canada. Recaptures (n = 413) reported roughly 200 commercial fishermen, up to 3 years after release. Only six all females, recaptured more than once. Recapture rates marginally higher for males (male 12%, female 10%) varied with area of release (range: 5%–12%)...