25 Works

Exploring causal components of plasticity in grey seal birthdates: effects of intrinsic traits, demography, and climate

Cornelia Den Heyer
Change in breeding phenology is often a response to environmental forcing, but less is known of the mechanism underlying such changes and their fitness consequences. Here we report on changes in the breeding phenology from a 27-year longitudinal study (1991-2017) of individually marked, known-aged grey seals (Halichoerus grypus) on Sable Island, Nova Scotia, Canada. We used Generalized Linear Mixed Models to test hypotheses about the influence of fixed factors (maternal age, parity, previous reproductive success,...

Données satellitaires de chlorophylle-a pour l'estuaire et le golfe du St-Laurent

La couleur de l'eau de mer, vue de l'espace, permet d'estimer le contenu en chlorophylle dans l'eau. Ce pigment est un indice de la biomasse des algues microscopiques. Par rapport à l'océan Atlantique, les eaux de l'estuaire et du golfe du St-Laurent sont plutôt isolées et sont fortement mélangées à l'eau douce en provenance de nombreuses rivières. La méthode pour retrouver la chlorophylle doit être adaptée à ces spécificités. Ce jeu de données présente le...

Limited genetic parallelism underlies recent, repeated incipient speciation in geographically proximate populations of an Arctic fish (Salvelinus alpinus)

Sarah J. Salisbury, Gregory R. McCracken, Robert Perry, Donald Keefe, Kara K. S. Layton, Tony Kess, Cameron M. Nugent, Jong S. Leong, Ian R. Bradbury, Ben F. Koop, Moira M. Ferguson & Daniel E. Ruzzante
The genetic underpinnings of incipient speciation, including the genomic mechanisms which contribute to morphological and ecological differentiation and reproductive isolation, remain poorly understood. The repeated evolution of consistently, phenotypically distinct morphs of Arctic Charr (Salvelinus alpinus) within the Quaternary period offer an ideal model to study the repeatability of evolution at the genomic level. Sympatric morphs of Arctic Charr are found across this species' circumpolar distribution. However, the specific genetic mechanisms driving this morph differentiation...

Data from: Putative chromosomal rearrangements are associated primarily with ecotype divergence rather than geographic separation in an intertidal, poorly-dispersing snail

Tony Kess, Matthew Brachmann & Elizabeth Boulding
Littorina saxatilis is becoming a model system for understanding the genomic basis of ecological speciation. The parallel formation of crab-adapted ecotypes that exhibit partial reproductive isolation from wave-adapted ecotypes has enabled genomic investigation of conspicuous shell traits. Recent genomic studies suggest that chromosomal rearrangements may enable ecotype divergence by reducing gene flow. However, the genomic architecture of traits that are divergent between ecotypes remains poorly understood. Here, we use 11,504 single nucleotide polymorphism (SNP) markers...

Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic

David Yurkowski, Thomas Brown, Paul Blanchfield & Steve Ferguson
Climate change is altering the biogeochemical and physical characteristics of the Arctic marine environment, which impacts sea ice algal and phytoplankton bloom dynamics and the vertical transport of these carbon sources to benthic communities. Little is known about whether the contribution of sea ice-derived carbon to benthic fauna and nitrogen cycling has changed over multiple decades in concert with receding sea ice. We combined compound-specific stable isotope analysis of amino acids with highly-branched isoprenoid diatom...

Multiple decades of stocking has resulted in limited hatchery introgression in wild brook trout (Salvelinus fontinalis) populations of Nova Scotia

Sarah Lehnert, Shauna Baillie, John MacMillan, Ian Paterson, Colin Buhariwalla, Ian Bradbury & Paul Bentzen
Many populations of freshwater fishes are threatened with losses, and increasingly, the release of hatchery individuals is one strategy being implemented to support wild populations. However, stocking of hatchery individuals may pose long-term threats to wild populations, particularly if genetic interactions occur between wild and hatchery individuals. One highly prized sport fish that has been heavily stocked throughout its range is the brook trout (Salvelinus fontinalis). In Nova Scotia, Canada, hatchery brook trout have been...

Data from: Divergent and linked selection shape patterns of genomic differentiation between European and North American Atlantic salmon (Salmo salar)

Sarah Lehnert, Tony Kess, Paul Bentzen, Marie Clément & Ian Bradbury
As populations diverge many processes can shape genomic patterns of differentiation. Regions of high differentiation can arise due to divergent selection acting on selected loci, genetic hitchhiking of nearby loci, or through repeated selection against deleterious alleles (linked background selection); this divergence may then be further elevated in regions of reduced recombination. Atlantic salmon (Salmo salar) from Europe and North America diverged >600,000 years ago and despite some evidence of secondary contact, the majority of...

Prolonged maternal investment in northern bottlenose whales alters our understanding of beaked whale reproductive life history

Laura Feyrer, Shu Ting Zhao, Hal Whitehead & Cory Matthews
Nursing and weaning periods are poorly understood in cetaceans due to the difficulty of assessing underwater behaviour in the wild. However, the onset and completion of weaning are critical turning points for individual development and survival, with implications for a species life history including reproductive potential. δ15N and δ13C deposited in odontocete teeth annuli provide a lifetime record of diet, offering an opportunity to investigate variation and trends in fundamental biology. While available reproductive parameters...

Global port environmental data used for environmental distance calculations

Sarah Bailey, Johanna Bradie, Dawson Ogilvie & Paul Mudroch
This dataset contains a list of 8392 global commerical shipping ports, with geographic coordinates and four environmental variables (i.e. salinity, mean temperature during the warmest month, mean temperature during the coldest month and annual average temperature (all at water surface)). Data were primarily sourced from the U.S. National Oceanic and Atmospheric Administration World Ocean Atlas. Data for estuarine and riverine ports has been corrected, where better information was available, with particular focus on Canadian port...

Hippoglossus hippoglossus SNP data for coverage-based sex association

Anthony Einfeldt & Tony Kess
Changes in the genetic mechanisms that control sexual determination have occurred independently across the tree of life, and with exceptional frequency in teleost fishes. To investigate the genomic changes underlying the evolution of sexual determination, we sequenced a chromosome-level genome, multi-tissue transcriptomes, and population genomic data for the Atlantic Halibut (Hippoglossus hippoglossus), which has an XY/XX sex determination mechanism and has recently diverged from the Pacific Halibut (Hippoglossus stenolepis), which has a ZZ/ZW system. We...

Primary detection records for aquatic nonindigenous species in global estuarine and marine ecosystems and the Great Lakes

Sarah Bailey, Lyndsay Brown, Marnie Campbell, João Canning-Clode, James Carlton, Nuno Castro, Paula Chainho, Farrah Chan, Joel Creed, Amelia Curd, John Darling, Paul Fofonoff, Bella Galil, Chad Hewitt, Graeme Inglis, Inti Keith, Nicholas Mandrak, Agnese Marchini, Cynthia McKenzie, Anna Occhipinti-Ambrogi, Henn Ojaveer, Larissa Pires-Teixeira, Tamara Robinson, Gregory Ruiz, Kimberley Seaward … & Aibin Zhan
Aim The introduction of aquatic non-indigenous species (ANS) has become a major driver for global changes in species biogeography. We examined spatial patterns and temporal trends of ANS detections since 1965 to inform conservation policy and management. Location Global Methods We assembled an extensive dataset of first records of detection of ANS (1965-2015) across 49 aquatic ecosystems, including the i) year of first collection, ii) population status and iii) potential pathway(s) of introduction. Data were...

Data from: Divergent estimates of herd-wide caribou calf survival: ecological factors and methodological biases

Edward Hance Ellington, Keith P. Lewis, Erin Koen & Eric Vander Wal
Population monitoring is a critical part of effective wildlife management, but methods are prone to biases that can hinder our ability to accurately track changes in populations through time. Calf survival plays an important role in ungulate population dynamics and can be monitored using telemetry and herd composition surveys. These methods, however, are susceptible to unrepresentative sampling and violations of the assumption of equal detectability, respectively. Here we capitalized on 55 herd-wide estimates of woodland...

Analytical validation and field testing of a specific qPCR assay for environmental DNA detection of invasive European green crab - Collected and Generated Data

Louise-Marie D. Roux, Danièle Giblot-Ducray, Nathan Bott, Kathryn Wiltshire, Marty Deveney, Kristen Westfall & Cathryn Abbott
Environmental DNA (eDNA) methods are providing tools for detecting invasive species in aquatic environments. Targeted qPCR assays applied to eDNA samples promise to overcome limitations of traditional methods, especially for early detection. The European green crab (Carcinus maenas) is considered one of the most successful invasive species globally due to the large range it has invaded and negative impacts on native species, marine habitats, and shellfish industries. We developed, laboratory‐validated, and field‐tested a specific qPCR...

Resolving fine-scale population structure and fishery exploitation using sequenced microsatellites in a northern fish

Kara K.S. Layton, J. Brian Dempson, Paul V.R. Snelgrove, Steven J. Duffy, Amber M. Messmer, Ian Paterson, Nicholas W. Jeffery, Tony Kess, John B. Horne, Sarah J. Salisbury, Daniel E. Ruzzante, Paul Bentzen, David Côté, Cameron M. Nugent, Moira M. Ferguson, Jong S. Leong, Ben F. Koop & Ian R. Bradbury
The resiliency of populations and species to environmental change is dependent on the maintenance of genetic diversity, and as such quantifying diversity is central to combatting ongoing wide spread reductions in biodiversity. With the advent of next-generation sequencing, several methods now exist for resolving fine-scale population structure, but the comparative performance of these methods for genetic assignment has rarely been tested. Here we evaluate the performance of sequenced microsatellites and a single nucleotide polymorphism (SNP)...

DNA barcoding and morphometric data for Truncilla donaciformis and Truncilla truncata (Bivalvia: Unionidae)

Tyler Beyett, Kelly McNichols-O’Rourke, Todd Morris & David Zanatta
Closely-related unionid species often overlap in shell shape and can be difficult to accurately identify in the field. Ambiguity in identification can have serious impacts on conservation efforts and population surveys of endangered species. Truncilla donaciformis and T. truncata are sister species that overlap in their distributions and frequently co-occur in central North America. Because T. donaciformis is endangered in Canada and imperiled in some U.S. jurisdictions, co-occurrence with the morphologically-similar T. truncata means that...

Implications of life history uncertainty when evaluating status in the Northwest Atlantic population of white shark (Carcharodon carcharias)

Heather Bowlby & Jamie Gibson
To effectively protect at-risk sharks, resource managers and conservation practitioners must have a good understanding of how fisheries removals contribute to changes in abundance and how regulatory restrictions may impact a population trajectory. This means they need to know the number of animals being removed from a population and whether a given number of removals will lead to population increases or declines. For white shark (Carcharodon carcharias), theoretical quantities like the intrinsic rate of population...

Data from: Climate change and pathways of vessel traffic create marine protected area networks of invasion

Josephine Iacarella, Devin Lyons, Lily Burke, Ian Davidson, Thomas Therriault, Anya Dunham & Claudio DiBacco
Establishment of protected areas to maintain biodiversity requires identification, prioritization, and management of stressors that may undermine conservation goals. Nonindigenous species and climate change are critical ecosystem stressors that need greater attention in the context of spatial planning and management of protected areas. Risk of invasion into protected areas needs to be quantified under current and projected climate conditions in conjunction with prioritization of key vectors and vulnerable areas to enable development of effective management...

Data from: Insights on the concept of indicator populations derived from parentage-based tagging in a large-scale coho salmon application in British Columbia, Canada

Terry D. Beacham, Colin Wallace, Kim Jonsen, Brenda McIntosh, John R. Candy, David Willis, Cheryl Lynch & Ruth E. Withler
For Pacific salmon, the key fisheries management goal in British Columbia (BC) is to maintain and restore healthy and diverse Pacific salmon populations, making conservation of salmon biodiversity the highest priority for resource management decision-making. Salmon status assessments are often conducted on coded-wire tagged subsets of indicator populations based on assumptions of little differentiation within or among proximal populations. In the current study of southern BC coho salmon (Oncorhynchus kisutch) populations, parentage-based tagging (PBT) analysis...

rhinoceros auklet microsatellite data

Theresa Burg, Marie Prill, Katharine Studholme, Alice Domalik, Strahan Tucker, Catherine Jardine, Mark Maftei, Kenneth Wright, Jesse Beck, Russell Bradley, Ryan Carle, Thomas Good, Scott Hatch, Peter Hodum, Motohiro Ito, Scott Pearson, Nora Rojek, Leslie Slater, Yutaka Watanuki, Alexis Will, Aidan Bindoff, Glenn Crossin, Mark Drever & Mark Hipfner
We tested the hypothesis that segregation in wintering areas promotes population differentiation in a sentinel North Pacific seabird, the rhinoceros auklet (Cerorhinca monocerata). We collected tissue samples for genetic analyses on five breeding colonies in the western Pacific Ocean (Japan) and 13 in the eastern Pacific Ocean (California to Alaska), and deployed light-level geologgers on 12 eastern Pacific colonies to delineate wintering areas. Loggers were deployed previously on one colony in Japan. There was strong...

Species richness in North Atlantic fish: process concealed by pattern

Henrik Gislason, Jeremy Collie, Brian R. MacKenzie, Anders Nielsen, Maria De Fatima Borges, Teresa Bottari, Corina Chavez, Andrey V. Dolgov, Jakov Dulčić, Daniel Duplisea, Heino O. Fock, Didier Gascuel, Luís Gil De Sola, Jan Geert Hiddink, Remment Ter Hofstede, Igor Isajlović, Jónas Páll Jonasson, Ole Jørgensen, Kristján Kristinsson, Gudrun Marteinsdottir, Hicham Masski, Sanja Matić-Skoko, Mark R. Payne, Melita Peharda, Jakup Reinert … & Lilja Stefansdottir
Aim Previous analyses of marine fish species richness based on presence-absence data have shown changes with latitude and average species size, but little is known about the underlying processes. To elucidate these processes we use metabolic, neutral, and descriptive statistical models to analyse how richness responds to maximum species length, fish abundance, temperature, primary production, depth, latitude, and longitude, while accounting for differences in species catchability, sampling effort, and mesh size. Data Results from 53,382...

Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers

Cory Matthews, Iliana Ruiz-Cooley, Corinne Pomerleau & Steven Ferguson
Compound specific stable isotope analysis (CSIA) of amino acids (AAs) has been rapidly incorporated in ecological studies to resolve consumer trophic position (TP). Differential 15N fractionation of ‘trophic’ AAs, which undergo 15N enrichment with each trophic step, and ‘source’ AAs, which undergo minimal trophic 15N enrichment and serve as a proxy for primary producer δ15N values, allows for internal calibration of TP. Recent studies, however, have shown the difference between source and trophic AA δ15N...

Scientific shortcomings in environmental impact statements internationally

Gerald Singh, Jackie Lerner, Megan Mach, Cathryn Clarke Murray, Bernardo Ranieri, Guillaume Peterson St-Laurent, Janson Wong, Alice Guimaraes, Gustavo Yunda-Guarin, Terre Satterfield & Kai Chan
1. Governments around the world rely on environmental impact assessment to understand the environmental risks of proposed developments. 2. To examine the basis for these appraisals, we examine the output of environmental impact assessment processes in jurisdictions within seven countries, focusing on scope (spatial and temporal), mitigation actions, and whether impacts were identified as ‘significant’. 3. We find that the number of impacts characterized as significant is generally low. While this finding may indicate that...

Dataset for: Spatial and environmental effects on Coho Salmon life-history trait variation

Kim Tuor, Daniel Heath & Mark Shrimpton
Adult size, egg mass, fecundity and mass of gonads are affected by trade-offs between reproductive investment and environmental conditions shaping the evolution of life-history traits among populations for widely distributed species. Coho salmon Oncorhynchus kisutch have a large geographic distribution and different environmental conditions are experienced by populations throughout their range. We examined the effect of environmental variables on female size, egg size, fecundity, and reproductive investment of populations of Coho Salmon from across British...

Thermal stratification and fish thermal preference explain vertical eDNA distributions in lakes

Joanne Littlefair, Lee Hrenchuk, Paul Blanchfield, Michael Rennie & Melania Cristescu
Significant advances have been made towards surveying animal and plant communities using DNA isolated from environmental samples. Despite rapid progress, we lack a comprehensive understanding of the “ecology” of environmental DNA (eDNA), particularly its temporal and spatial distribution and how this is shaped by abiotic and biotic processes. Here, we tested how seasonal variation in thermal stratification and animal habitat preferences influence the distribution of eDNA in lakes. We sampled eDNA depth profiles of five...

Registration Year

  • 2020

Resource Types

  • Dataset


  • Fisheries and Oceans Canada
  • Dalhousie University
  • Memorial University of Newfoundland
  • University of Guelph
  • University of Windsor
  • National Oceanic and Atmospheric Administration
  • Scottish Association For Marine Science
  • University of Victoria
  • Bangor University
  • National Oceanography Centre