Download or read book Foraging Behavior of Arctic Grayling Thymallus Arcticus in a Tundra Stream written by Robert D. Ries and published by . This book was released on 1988 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Trophic Interactions of Young of the year Arctic Grayling Thymallus Arcticus in an Arctic Tundra Stream written by Heidi E. Golden and published by . This book was released on 1996 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freshwaters of Alaska written by Alexander M. Milner and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alaska's great size is mirrored by the large number and diversity of its freshwater ecosystems. This volume reviews and synthesizes research on a variety of Alaskan freshwaters including lakes, rivers and wetlands. The vast range of Alaskan habitats ensures that the chapters in this book will provide valuable information for readers interested in freshwaters, particularly nutrient dynamics, biotic adaptations, recovery mechanisms of aquatic biota, stream succession and the management of human-induced changes in aquatic habitats.
Download or read book Determining the Habitat Occupancy of Young of Year Arctic Grayling Thymallus Arcticus in Sub Arctic Tundra Streams While Accounting for Imperfect Detection written by Kyle Artym and published by . This book was released on 2016 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: I developed multi-state, multi season occupancy models to determine how a number of interacting ecological variables influence the occurrence of young-of-year (YOY) Arctic Grayling (Thymallus arcticus) in nine streams on the sub-Arctic tundra. The model was developed and parameterized such that three different 'states' of occupancy were investigated (i.e., not occupied, somewhat occupied, and highly occupied), and temporal replication allowed me to account for uncertainty associated with imperfect detection; a common limitation of quantitative species-habitat-use studies. Depth and velocity decreased the probability of occupancy, and the effects were similar to previous Barrenland research. Stream Slope, Overhanging Cover, and Distance to Overwintering Habitat played a major role in explaining YOY Arctic Grayling habitat occupancy; while habitat complexity also was an important determinant. Electrofishing was more efficient at detecting YOY Arctic Grayling in somewhat occupied stream segments, while survey method is unimportant for detecting YOY in highly occupied stream segments. Also, detection efficiency varied between model seasons, and decreased with depth. By accounting for imperfect detection, my research improves the accuracy of occupancy estimates, and enhances our understanding of the habitat requirements of YOY Arctic Grayling in lake outlet streams of the sub-Arctic tundra. This should provide researchers and managers with a greater understanding of the habitats that YOY Arctic Grayling use, and enable researchers, resource managers, and regulators to track shifts in habitat use by YOY Arctic Grayling as climate change and growing industrial presence continue to shape the Canadian North.
Download or read book Growth Foraging Behavior and Distribution of Age 0 Arctic Grayling in an Alaskan Stream written by Cheryl Ann Dion and published by . This book was released on 2002 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: "I evaluated the ability of three models to relate habitat characteristics to habitat quality for age-0 Arctic grayling Thymallullus arcticus in an Alaska stream. A temperature-based growth model made accurate predictions, showing it can reliably assess thermal habitat quality. Deviations between predicted and observed growth were useful because they identified the timing of possible critical periods, when competition for food or space may cause density-dependent mortality and emigration. A foraging model consistently overestimated the mean prey size of fish, showing that such models need further work before then can accurately assess food availability from invertebrate drift. A habitat selection model accurately predicted small fish would occupy the stream margins and the ontogenetic shift into faster, deeper water, but its detailed predictions for larger fish were not very precise. These models were useful tools for assessing habitat quality and gave insight into possible interactions between habitat characteristics and population dynamics"--Leaf iii.
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1990 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trophic Pathways Supporting Arctic Grayling in a Small Stream on the Arctic Coastal Plain Alaska written by Jason John McFarland and published by . This book was released on 2015 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arctic Grayling (Thymallus arcticus) are widely distributed on the Arctic Coastal Plain (ACP) of Alaska, and are one of the few upper level consumers in streams, but the trophic pathways and food resources supporting these fish are unknown. Grayling migrate each summer into small beaded streams, which are common across the landscape on the ACP, and appear to be crucial foraging grounds for these and other fishes. I investigated prey resources supporting different size classes of grayling in a beaded stream, Crea Creek, where petroleum development is being planned. The specific objectives were to measure terrestrial prey subsidies entering the stream, quantify prey ingested by Arctic Grayling and Ninespine Stickleback (Pungitius pungitius), determine if riparian plant species affect the quantity of terrestrial invertebrates ingested by grayling, and determine if prey size and type ingested were a function of predator size. Results indicated that small grayling ( 15 cm fork length (FL)) consumed mostly aquatic invertebrates (caddisflies, midges, and blackflies) early in the summer, and increasing quantities of terrestrial invertebrates (wasps, beetles, and spiders) later in summer, while larger fish ( 15 cm FL) foraged most heavily on stickleback. Riparian plant species influenced the quantity of terrestrial invertebrates entering the stream, however these differences were not reflected in fish diets. This study showed that grayling can be both highly insectivorous and piscivorous, depending upon fish size class, and that both aquatic and terrestrial invertebrates, and especially stickleback, are the main prey of grayling. These results highlight the importance of beaded streams as summer foraging habitats for grayling. Understanding prey flow dynamics in these poorly studied aquatic habitats, prior to further petroleum development and simultaneous climate change, establishes essential baseline information to interpret if and how these freshwater ecosystems may respond to a changing Arctic environment.
Download or read book Research Paper PNW written by and published by . This book was released on 1978 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interdisciplinary Approaches to Enhance Biological Data Collection and Understanding of Arctic Grayling Thymallus Arcticus Spawning Behaviour written by Patricia Ann House and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Increased pressure of industrial development in the Arctic drives the need for a better understanding of Arctic fish and their interaction with their habitat. Environmental disturbances resulting from these developments often require off-setting facilities, particularly with respect to Arctic grayling (Thymallus arcticus) spawning activity. Furthermore, the Arctic is also expected to experience increased climate change effects resulting in adaptations to Arctic grayling behaviour in response to their changing environment. Due to the remoteness of sites, climate extremes and variability, fisheries field work in the Arctic typically requires extensive support, such as camp infrastructure, helicopters, and durable equipment. Support costs to undertake these field programs often limit data collection efforts, potentially leading to questionable habitat assumptions being made that will adversely affect fish behaviour. Using a multi-disciplinary approach, this thesis validated three approaches for improving Arctic grayling enumeration and for establishing a better basis for habitat design criteria: (1) A wildlife camera enumeration technique for Arctic streams was found to be comparable for population estimates when compared to trap boxes and visual stream surveys and able to provide longer data sets with less field time. The use of wildlife cameras is a suitable technique for remote locations but selection will depend on the specific requirements of an enumeration program; (2) Using paired values of depth and velocity, Arctic grayling spawning site selection can be described by the dimensionless Froude number. The preferred Arctic grayling mean Froude number value was found to be 0.27 (SE=0.0045) and was not significantly different between two populations of Arctic grayling in different size streams. This value is also lower than that identified for Sockeye and Atlantic salmon (Froude number = 0.34) which can likely be attributed to their larger size and different spawning behaviour and substrate selections when compared to Arctic grayling; (3) Commonly measured cross-sectional variables of stream discharge and water temperature were linked in a longitudinal manner through Maximum Likelihood Estimation analysis. Such an approach illustrates the importance of standardizing data for meaningful comparison by consideration of the relationship between variables leading up to a life history event, not just the event itself. A relationship was shown between unit discharge and water temperature leading up to the Arctic grayling spawning event. The enumeration technique was a field project using wildlife cameras images that compared to physical fish counting data being undertaken concurrently by Arctic Canadian Diamond Company Ltd. at Ekati Diamond Mine in the Northwest Territories, Canada. The consideration of spawning activities in relation to habitat and hydraulic characteristics were developed using existing data sets collected as part of regulatory compliance monitoring programs as well as from the available literature.
Download or read book Landscape Effects on Growth of Age 0 Arctic Grayling in Tundra Streams written by Peter D. MacKinnon and published by . This book was released on 2006 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variation in Salmonid Life Histories written by Mary F. Willson and published by . This book was released on 1997 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Life History Spawning Behavior and Interspecific Interactions of the Arctic Grayling written by David Anthony Beauchamp and published by . This book was released on 1982 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Planktivorous Feeding Ecology of Arctic Grayling Thymallus Arcticus written by David R. Schmidt and published by . This book was released on 1980 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Velocity Prey Capture Success and Microhabitat Selection in Arctic Grayling thymallus Arcticus written by Bryan Benjamin Bozeman and published by . This book was released on 2017 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our knowledge of factors affecting microhabitat selection for drift feeding salmonids is incomplete. We quantified relationships between water velocity, fish size, days in captivity, and dominance (predictor variables) and prey capture success, holding velocity, and reactive distance (response variables) experimentally for three sets of fluvial Alaskan Arctic Grayling. Water velocity had a negative effect on prey capture success and a positive effect on holding velocity in all experiments. Holding velocity increased at a slower rate than capture velocity and plateaued at 30 cm/s at velocities of 30 cm/s and greater. Reactive distance displayed a weak (positive) or nonexistent relationship with velocity. Dominant fish captured more prey than subordinate fish, but had similar holding velocities and reactive distances. Holding velocity predictions from Grossman et al.'s (Grossman et al., 2002) foraging model (41.2 cm/s, 36.2 cm/s, 34.7 cm/s) were greater than Arctic Grayling holding velocities measured in Panguingue Creek, AK (95% CI: 20.7 0́3 27.9 cm/s).
Download or read book Comparing Habitat Use and Mercury Accumulation in Arctic Grayling Thymallus Arcticus from Two Northern Ecosystems written by Jonathon Brent Lewis and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An improved understanding of the distribution and habitat requirements for mountain stream populations of Arctic Grayling (Thymallus arcticus) is necessary to assess their vulnerability to environmental stressors, establish thresholds for development activities, and evaluate population distribution trends over time. Life stage-specific habitat use may be a particularly sensitive indicator of environmental change, but baseline data is lacking, especially for young-of year (YOY) Arctic Grayling. Occupancy-based survey methods were used in the Little Nahanni River watershed in 2015 to quantify Arctic Grayling occupancy across the landscape. Data on a suite of associated habitat variables were also collected to explain YOY occupancy, and to relate to detection efficiency during field surveys, as detection efficiency is an often-neglected aspect of field sampling that affects our understanding of species-habitat relationships. Occupancy modelling has revealed that stream temperature (>8ʻC) and elevation (
Download or read book Status of the Arctic Grayling in Alberta written by Walker and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Northwest National Petroleum Reserve Alaska written by and published by . This book was released on 2003 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
