Tanya M. Brown
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View article: Interspecific differences in mercury and organochlorine pesticide concentrations in Arctic and boreal fishes
Interspecific differences in mercury and organochlorine pesticide concentrations in Arctic and boreal fishes Open
The diversity and complexity of Arctic fish communities increases as boreal species expand their range poleward in response to changing environmental conditions. In turn, borealization of fish communities modifies the species composition o…
View article: Legacy and current-use contaminants in Pacific Chinook salmon (<i>Oncorhynchus tshawytscha</i>) stocks and their contribution to Resident killer whale (<i>Orcinus orca</i>) contaminant burdens
Legacy and current-use contaminants in Pacific Chinook salmon (<i>Oncorhynchus tshawytscha</i>) stocks and their contribution to Resident killer whale (<i>Orcinus orca</i>) contaminant burdens Open
The Endangered Southern Resident killer whales (SRKW, Orcinus orca) face significant threats, including reduced abundance and quality of their primary prey (Chinook salmon, Oncorhynchus tshawytscha) and high levels of endocrine disrupting …
View article: Contaminant-Associated Disruption of the Skin Transcriptome in the Endangered St. Lawrence Estuary Beluga
Contaminant-Associated Disruption of the Skin Transcriptome in the Endangered St. Lawrence Estuary Beluga Open
The St. Lawrence Estuary (SLE) beluga (Delphinapterus leucas) population in Canada is Endangered, and endocrine disrupting contaminants, such as polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and other halogenate…
View article: Tracking the Marine Migrations of Coho and Chinook Salmon
Tracking the Marine Migrations of Coho and Chinook Salmon Open
During their marine life stage, Chinook (Oncorhynchus tshawytscha) and coho salmon (Oncorhynchus kisutch) from watersheds connected to the Salish Sea display two distinct migration phenotypes; Strait of Georgia resident and out-migrant. Kn…
View article: An environmentally sensitive method for rapid monitoring of 6PPD-quinone in aqueous samples using solid phase extraction and direct sample introduction with liquid chromatography and tandem mass spectrometry
An environmentally sensitive method for rapid monitoring of 6PPD-quinone in aqueous samples using solid phase extraction and direct sample introduction with liquid chromatography and tandem mass spectrometry Open
A novel sensitive environmental strategy for rapid monitoring of 6PPD-Q in water was developed to reduce solvent consumption and waste generation.
View article: Warning sign of an accelerating decline in critically endangered killer whales (Orcinus orca)
Warning sign of an accelerating decline in critically endangered killer whales (Orcinus orca) Open
Wildlife species and populations are being driven toward extinction by a combination of historic and emerging stressors (e.g., overexploitation, habitat loss, contaminants, climate change), suggesting that we are in the midst of the planet…
View article: Polychlorinated biphenyl and polybrominated diphenyl ether profiles vary with feeding ecology and marine rearing distribution among 10 Chinook salmon (Oncorhynchus tshawytscha) stocks in the North Pacific Ocean
Polychlorinated biphenyl and polybrominated diphenyl ether profiles vary with feeding ecology and marine rearing distribution among 10 Chinook salmon (Oncorhynchus tshawytscha) stocks in the North Pacific Ocean Open
Chinook salmon (Oncorhynchus tshawytscha) along the west coast of North America have experienced significant declines in abundance and body size over recent decades due to several anthropogenic stressors. Understanding the reasons underlyi…
View article: Automated, High-Throughput Analysis of Tire-Derived <i>p</i>-Phenylenediamine Quinones (PPDQs) in Water by Online Membrane Sampling Coupled to MS/MS
Automated, High-Throughput Analysis of Tire-Derived <i>p</i>-Phenylenediamine Quinones (PPDQs) in Water by Online Membrane Sampling Coupled to MS/MS Open
The tire-derived contaminant N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine quinone (6-PPDQ) was recently identified as a potent toxin to coho salmon (Oncorhynchus kisutch). Studies investigating 6-PPDQ have employed solid-phase extrac…
View article: Changing environmental conditions have altered the feeding ecology of two keystone Arctic marine predators
Changing environmental conditions have altered the feeding ecology of two keystone Arctic marine predators Open
Environmental change in the Arctic has impacted the composition and structure of marine food webs. Tracking feeding ecology changes of culturally-valued Arctic char ( Salvelinus alpinus ) and ringed seals ( Pusa hispida ) can provide an in…
View article: Acute Toxicity of 6PPD-Quinone to Early Life Stage Juvenile Chinook (<i>Oncorhynchus tshawytscha</i>) and Coho (<i>Oncorhynchus kisutch</i>) Salmon
Acute Toxicity of 6PPD-Quinone to Early Life Stage Juvenile Chinook (<i>Oncorhynchus tshawytscha</i>) and Coho (<i>Oncorhynchus kisutch</i>) Salmon Open
The breakdown product of the rubber tire antioxidant N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine-quinone (6PPD)-6-PPD-quinone has been strongly implicated in toxic injury and death in coho salmon (Oncorhynchus kisutch) in urban wate…
View article: Declining concentrations of chlorinated paraffins in endangered St. Lawrence Estuary belugas (Delphinapterus leucas): Response to regulations or a change in diet?
Declining concentrations of chlorinated paraffins in endangered St. Lawrence Estuary belugas (Delphinapterus leucas): Response to regulations or a change in diet? Open
Very high levels of industrial contaminants in St. Lawrence Estuary (SLE) beluga whales represent one of the major threats to this population classified as endangered under the Species at Risk Act in Canada. Elevated concentrations of shor…
View article: Simultaneous determination of steroid hormones and pharmaceuticals in killer whale (<i>Orcinus orca</i>) faecal samples by liquid chromatography tandem mass spectrometry
Simultaneous determination of steroid hormones and pharmaceuticals in killer whale (<i>Orcinus orca</i>) faecal samples by liquid chromatography tandem mass spectrometry Open
We describe a non-invasive method for profiling selected hormones, pharmaceuticals and personal care products (PPCPs) in killer whales (Orcinus orca) based on analysis of faecal samples by liquid chromatography tandem mass spectrometry (LC…
View article: A Multi-Matrix Metabolomic Approach in Ringed Seals and Beluga Whales to Evaluate Contaminant and Climate-Related Stressors
A Multi-Matrix Metabolomic Approach in Ringed Seals and Beluga Whales to Evaluate Contaminant and Climate-Related Stressors Open
As a high trophic-level species, ringed seals (Pusa hispida) and beluga whales (Delphinapterus leucas) are particularly vulnerable to elevated concentrations of biomagnifying contaminants, such as polychlorinated biphenyls (PCBs), polybrom…
View article: Marine mammal hotspots across the circumpolar Arctic
Marine mammal hotspots across the circumpolar Arctic Open
Aim Identify hotspots and areas of high species richness for Arctic marine mammals. Location Circumpolar Arctic. Methods A total of 2115 biologging devices were deployed on marine mammals from 13 species in the Arctic from 2005 to 2019. Ge…
View article: Zooplankton assemblages along the North American Arctic: Ecological connectivity shaped by ocean circulation and bathymetry from the Chukchi Sea to Labrador Sea
Zooplankton assemblages along the North American Arctic: Ecological connectivity shaped by ocean circulation and bathymetry from the Chukchi Sea to Labrador Sea Open
We defined mesozooplankton biogeography in the North American Arctic to elucidate drivers of biodiversity, community structure, and biomass of this key component of the Arctic marine ecosystem. A multivariate analysis identified four mesoz…
View article: Variation in body size of ringed seals (Pusa hispida hispida) across the circumpolar Arctic: evidence of morphs, ecotypes or simply extreme plasticity?
Variation in body size of ringed seals (Pusa hispida hispida) across the circumpolar Arctic: evidence of morphs, ecotypes or simply extreme plasticity? Open
The ringed seal is a small phocid seal that has a northern circumpolar distribution. It has long been recognized that body size is variable in ringed seals, and it has been suggested that ecotypes that differ in size exist. This study expl…
View article: Seafloor biodiversity of Canada's three oceans: Patterns, hotspots and potential drivers
Seafloor biodiversity of Canada's three oceans: Patterns, hotspots and potential drivers Open
Aim We examined the relationships between bathymetry, latitude and energy and the diversity of marine benthic invertebrates across wide environmental ranges of Canada's three oceans. Location Canadian Pacific, Arctic and Atlantic Oceans fr…
View article: Abundance and species diversity hotspots of tracked marine predators across the North American Arctic
Abundance and species diversity hotspots of tracked marine predators across the North American Arctic Open
Aim Climate change is altering marine ecosystems worldwide and is most pronounced in the Arctic. Economic development is increasing leading to more disturbances and pressures on Arctic wildlife. Identifying areas that support higher levels…
View article: Yurkowski et al. 2018 - Arctic Hotspots DDI shapefiles.zip
Yurkowski et al. 2018 - Arctic Hotspots DDI shapefiles.zip Open
These filesets support data from the following paper published in Diversity and Distributions:Abundance and species diversity hotspots of tracked marine predators across the North American ArcticDOI: 10.1111/ddi.12860These filesets are GIS…
View article: Mercury trends in cormorant and great blue heron eggs from Pacific Canada: a question of local and global sources
Mercury trends in cormorant and great blue heron eggs from Pacific Canada: a question of local and global sources Open
Mercury (Hg) levels and trends in the NE Pacific Ocean are due to the convergence between natural and anthropogenic sources, with the latter broadly related to a combination of local and long-range sources. Legacy and current local point s…