Clayton H. Riddell Faculty of Environment, Earth, and Resources Scholarly Works
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Recent Submissions
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Predation of archival tagged Dolly Varden, Salvelinus malma, reveals predator avoidance behaviour and tracks feeding events by presumed beluga whale, Delphinapterus leucas, in the Beaufort Sea
(2021-12-20)Abstract Background We report compelling evidence suggesting a predation event of a pop-up satellite archival tagged anadromous Dolly Varden (Salvelinus malma) by a marine ... -
Distinct Ocean Responses to Greenland's Liquid Runoff and Iceberg Melt
(American Geophysical Union, 2021-11-11)While Greenland discharge has been increasing in the last decades, its impact on the Meridional Overturning Circulation (MOC) is not clearly established. Because of that, the accuracy of this discharge representation in ... -
A meta-collection of nitrogen stable isotope data measured in Arctic marine organisms from the Canadian Beaufort Sea, 1983–2013
(2021-09-06)Abstract Objectives Existing information on Arctic marine food web structure is fragmented. Integrating data across research programs is an important strategy for building a ... -
The effect of crop species on DNase-producing bacteria in two soils
(2021-03-12)Abstract Purpose Extracellular deoxyribonucleases (exDNases) from microbial origin contribute substantially to the restriction of extracellular DNA (exDNA) in the soil. Hence, ... -
The EU Horizon 2020 project GRACE: integrated oil spill response actions and environmental effects
(2019-07-16)Abstract This article introduces the EU Horizon 2020 research project GRACE (Integrated oil spill response actions and environmental effects), which focuses on a holistic approach towards investigating and ... -
Anthropogenic landscape changes and their impacts on terrestrial and freshwater soundscapes
(Springer, 2019)Purpose of review: Quantifying the effects of anthropogenic sounds on wildlife at the landscape scale of observation has been notoriously difficult because these sounds are often confounded with the presence of infrastructure ... -
Direct effects of cattle on grassland birds in Canada
(2014)Effects of grazing on grassland birds are generally thought to be indirect, through alteration of vegetation structure; however, livestock can also affect nest survival directly through trampling and other disturbances ... -
Growth, sexual maturity, and reproduction of a female Midland Painted Turtle (Chrysemys picta marginata) afflicted with kyphosis
(2015)Kyphosis, a congenital humpback condition of the spinal column, has been reported across a broad range of chelonian taxa. These reports are often of single observations and lack background information about the history of ... -
Grazing Intensity influences Ground Squirrel and American Badger Habitat Use in Mixed-Grass Prairies
(2014)Ground squirrel (Spermophilus spp.) and American badger (Taxidea taxus) burrowing activities are ecologically important disturbances that contribute to the heterogeneity of prairie environments. These activities also have ... -
Savannah sparrows (Passerculus sandwichensis) nesting close to energy infrastructure alarm call at a lower frequency
(Taylor and Francis, 2018)Many birds rely on alarm calls during nest defense to communicate about risk, but anthropogenic disturbance, including noisy industrial infrastructure, has the potential to disrupt alarm communication. Birds may overcome ... -
Urban rights-of-way as extensive butterfly habitats: a case study from Winnipeg, Canada
(Elsevier, 2017)Urban rights-of-way (ROWs) offer large underused tracts of land that could be managed for plants and butterflies of threatened ecosystems like tall-grass prairies. However, built-up unvegetated urban lands might serve as ... -
Quantifying the influences of grazing, climate and their interactions using Landsat TM images
(Wiley, 2017)Appropriate grazing management ensures sustainable productivities of grassland ecosystems while maintaining grassland services. Thus, it is important to understand the influences of grazing management on grassland ecosystems, ... -
The final frontier: Early-stage genetic introgression and hybrid habitat use in the northwestern extent of the Golden-winged Warbler breeding range
(2018)Anthropogenic changes to the landscape and climate have resulted in secondary contact between previously allopatric species. This can result in genetic introgression and reverse speciation when closely related species are ... -
Effects of Weather and Land Management on the Western Prairie Fringed-orchid (Platanthera praeclara) at the Northern Limit of its Range in Manitoba, Canada
(2015)The western prairie fringed-orchid is a rare North American orchid restricted to a few remnants of wet to mesic tallgrass prairie. It is federally listed in both Canada and the United States and both countries have developed ... -
Managing Mixed-grass Prairies for Songbirds Using Variable Cattle Stocking Rates
(Elsevier, 2015)Most remaining grasslands are used for livestock grazing; stocking rates could be managed to help stop declining songbird populations. We examined the effects of stocking rates on grassland songbirds in northern mixed-grass ... -
Effects of twice-over rotational grazing on songbird nesting success in years with and without flooding
(Elsevier, 2018)Rotational grazing is sometimes promoted for grassland bird conservation, but the benefits to wildlife have not been comprehensively documented. We examined effects of twice-over rotational grazing on nesting success of ... -
PHYSICAL FOOTPRINT OF OIL AND GAS INFRASTRUCTURE, NOT ANTHROPOGENIC NOISE, REDUCES NESTING SUCCESS OF SOME GRASSLAND SONGBIRDS
(Elsevier, 2016)Western North America’s grasslands have undergone a rapid expansion of conventional oil and natural gas development, the effects of which are largely unknown for nesting songbirds. Understanding mechanisms that drive ... -
Ability to alter song in two grassland songbirds exposed to simulated anthropogenic noise is not related to pre-existing variability.
(Taylor and Francis, 2018)Organisms encounter noise naturally in the environment. However, increasing prevalence of human-caused noise seems to be resulting in behavioural changes in many animals that can affect survival and reproduction. Not all ... -
Shallow gas development and grassland songbirds: the importance of perches
(Wiley, 2017)Grassland bird species have declined more than birds of any other region in North America and industrial development may exert further pressure on these species. We evaluated effects of conventional natural gas infrastructure ... -
Measuring habitat fragmentation: An evaluation of landscape pattern metrics
(Wiley, 2014)Landscape patterns influence a range of ecological processes at multiple spatial scales. Landscape pattern metrics are often used to study the patterns that result from the linear and nonlinear interactions between spatial ...
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