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Author : Jamie R. Crait
Publisher :
ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (13 download)
Download or read book River Otters, Cutthroat Trout, and Their Future in Yellowstone National Park written by Jamie R. Crait and published by . This book was released on 2002 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jamie R. Crait
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (13 download)
Download or read book Indirect Effects of Bioinvasions in Yellowstone Lake: The Response of River Otters to Declines in Native Cutthroat Trout written by Jamie R. Crait and published by . This book was released on 2015 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonnative species threaten ecosystems throughout the world ? including protected reserves. In Yellowstone National Park, river otters Lontra canadensis depend on native cutthroat trout as prey. However, nonnative lake trout and whirling disease have significantly reduced the abundance of these native fish in the park's largest body of water, Yellowstone Lake. We studied the demographic and behavioral responses of otters to declining cutthroat trout on Yellowstone Lake and its tributaries. From 2002-2008, we monitored otter activity at latrine (scent-marking) sites, collected scat for prey identification, and used individual genotypes from scat and hair samples to evaluate survival and abundance with capture?recapture methods. Otter activity at latrines decreased with declines in cutthroat trout, and the prevalence of these fish in otter scat declined from 73% to 53%. Cutthroat trout numbers were the best predictor of temporal variation in apparent survival, and mean annual survival for otters was low (0.72). The density of otters in our study area (1 otter per 13.4 km of shoreline) was also low, and evidence of a recent genetic bottleneck suggests that otter abundance might have declined prior to our study. River otters in and around Yellowstone Lake appear to be responding to reductions in cutthroat trout via changes in distribution, diet, and possibly survival and abundance. Our results provide a baseline estimate for monitoring the broader outcome of management efforts to conserve native cutthroat trout and emphasize the indirect ecosystem consequences of invasive species.
Author : P. J. White
Publisher : Harvard University Press
ISBN 13 : 0674076435
Total Pages : 321 pages
Book Rating : 4.6/5 (74 download)
Download or read book Yellowstone’s Wildlife in Transition written by P. J. White and published by Harvard University Press. This book was released on 2013-04-15 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world's first national park, Yellowstone is a symbol of nature's enduring majesty and the paradigm of protected areas across the globe. But Yellowstone is constantly changing. How we understand and respond to events that are putting species under stress, say the authors of Yellowstone's Wildlife in Transition, will determine the future of ecosystems that were millions of years in the making. With a foreword by the renowned naturalist E. O. Wilson, this is the most comprehensive survey of research on North America's flagship national park available today. Marshaling the expertise of over thirty contributors, Yellowstone's Wildlife in Transition examines the diverse changes to the park's ecology in recent decades. Since its creation in the 1870s, the priorities governing Yellowstone have evolved, from intensive management designed to protect and propagate depleted large-bodied mammals to an approach focused on restoration and preservation of ecological processes. Recognizing the importance of natural occurrences such as fires and predation, this more ecologically informed oversight has achieved notable successes, including the recovery of threatened native species of wolves, bald eagles, and grizzly bears. Nevertheless, these experts detect worrying signs of a system under strain. They identify three overriding stressors: invasive species, private-sector development of unprotected lands, and a warming climate. Their concluding recommendations will shape the twenty-first-century discussion over how to confront these challenges, not only in American parks but for conservation areas worldwide. Highly readable and fully illustrated, Yellowstone's Wildlife in Transition will be welcomed by ecologists and nature enthusiasts alike.
Author : Jamie R. Crait
Publisher :
ISBN 13 : 9781303106767
Total Pages : 178 pages
Book Rating : 4.1/5 (67 download)
Download or read book The Impact of Nonnative Species on River Otters and Aquatic-terrestrial Linkages in Yellowstone National Park written by Jamie R. Crait and published by . This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: River otters (Lontra canadensis) in Yellowstone Lake, Yellowstone National Park, depend on native cutthroat trout (Oncorhynchus clarki bouvieri) as prey, especially during summer when the fish migrate from the lake into its tributary streams to spawn. As part of their social behavior, otters deposit excreta at latrine (scent-marking) sites along these spawning streams and fertilize riparian plants with aquatically-derived nutrients such as nitrogen (N). Over the last two decades, however, nonnative lake trout trout (Salvelinus namaycush ) and whirling disease (caused by the parasite Myxobolus cerebralis), have contributed to a dramatic decline in the lake's cutthroat trout population. Declines in cutthroat trout could reduce the abundance and distribution of otters, and sever the nutrient link they provide. This dissertation describes aspects of the biology of river otters in Yellowstone Lake in the context of these changes to the lake's food web. This dissertation is presented in four journal-formatted chapters. Chapter 1 compares the hematology of high elevation Yellowstone otters with a sea level population. Comparisons of oxygen dissociation curves revealed no significant difference in hemoglobin-oxygen binding affinity between the two populations. Instead, high elevation otters had greater hemoglobin concentrations than their sea level conspecifics. Yellowstone otters displayed higher levels of the vasodilator nitric oxide, and half the concentration of the serum protein albumin, possibly to compensate for increased blood viscosity. Theoretical aerobic dive limits were similar between high elevation and sea level otters due to the lower availability of oxygen at altitude. Chapter 2 presents the first estimates of population size and survival for river otters in Yellowstone National Park. Although the cutthroat trout population continued to decline during the study, there was no significant change in otter population size. However, overall densities (1 otter/9.91 km of shoreline) were lower than reported for most river otter populations, and evidence of a recent genetic bottleneck suggested the population may have already declined by the onset of the study. Annual survival for otters was 0.67 and correlated with cutthroat trout abundance in some models. Otters primarily responded to reductions in cutthroat trout via behavioral shifts in their spatial distribution and prey consumption. Activity at latrine sites decreased with declines in cutthroat trout on several tributary streams. Cutthroat trout remained the dominant prey item in otter scats throughout the study, but showed a declining trend from a frequency of occurrence of 73% in 2003 to 54% in 2008. Chapter 3 documents the effects of otter-derived N fertilization on trees at latrine sites. Stable N isotope (15 N) values were higher in needles of Engelmann spruce (Picea engelmannii) and lodgepole pine (Pinus contorta) on otter latrines than at reference sites. However, tree growth was greater on reference sites. No relationship existed between cutthroat trout abundance and tree ring 15 N, precluding the ability to detect whether the trout-otter-excreta link has changed with the cutthroat trout population. Chapter 4 is a note on seasonal breeding in Yellowstone otters. Although river otters in temperate regions typically breed in March and April, Yellowstone otters showed evidence of late seasonal breeding in June. This observation suggests otters in Yellowstone Lake have a relatively long breeding season, or their breeding schedule is delayed so that energetically-demanding lactation coincides with spawning runs of Yellowstone cutthroat trout. (Abstract shortened by UMI.)
Author : William Ralph Wengeler
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (79 download)
Download or read book Feeding Habits of Yellowstone River Otters on Two Lakes written by William Ralph Wengeler and published by . This book was released on 2008 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The introduction of exotic lake trout (Salvelinus namaycush) to Yellowstone Lake in Yellowstone National Park has contributed to a significant decline in the heretofore healthy population of Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri). There is great concern not only regarding the persistence of this genetically pure cutthroat subspecies, but also for the potential impacts their disappearance will have on the fish-eating predators of Yellowstone Lake and the surrounding community. Nearby Lewis Lake has no cutthroat trout, but is home to a well-established population of non-native lake trout, brown trout (Salmo trutta), and Utah chub (Gila atraria). We examined the contents of 179 river otter (Lontra canadensis) scats collected along the shores of Yellowstone (n=101) and Lewis Lakes (n=78) in Yellowstone National Park to compare otter dietary habits, especially with regard to the mustelid's utilization of native vs. non-native fish species. We also assessed diets using stable isotopes analysis ... on otters and represenatative prey from both lakes. In addition, we analyzed the isotopic signatures of fur taken from Yellowstone Lake otter specimens collected in the early part of the 20th century before exotic trout were introduced. Fecal analysis indicated that trout were consumed much more frequently by contemporary Yellowstone Lake otters (57% annually) than by otters occupying Lewis Lake (12% annually). The predominant fish found in Lewis Lake otter feces were minnows, presumably Utah chub. Stable isotopes analysis, however, identified longnose suckers (Catostomus catostomus) as the primary fish prey for Yellowstone Lake otters (56% contribution to otter diet), while indicating that otters there are generally preying on neither cutthroat trout nor introduced lake trout. Analysis of stable isotopes also indicated that contemporary Yellowstone Lake otters forage at a lower trophic level ... than their historic counterparts ... Isotopic data from Lewis Lake revealed that brown trout (60% contribution to otter diet) contribute more to otter diets there than local lake trout and Utah chub together (40% combined contribution). This study establishes the importance of alternative prey species to otters foraging on both lakes and supplements the growing body of research demonstrating that lake trout will not constitute a major food source for Yellowstone river otters."--Abstract.
Author : William Ralph Wengeler
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (13 download)
Download or read book Ecological Consequences of Invasive Lake Trout on River Otters in Yellowstone National Park written by William Ralph Wengeler and published by . This book was released on 2010 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The introduction of lake trout (Salvelinus namaycush) to Yellowstone Lake in Yellowstone National Park has contributed to a significant decline in the endangered Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri), leading to concern over the persistence of this subspecies but also to piscivorous predators in this community. We assessed the impact of lake trout on a key piscivore, the river otter (Lontra canadensis) in two lakes in Yellowstone National Park. Yellowstone Lake continues to support a native cutthroat trout population, although the recent introduction of lake trout has dramatically impacted the cutthroat trout population. Nearby Lewis Lake has an entirely introduced fish fauna of lake trout, brown trout (Salmo trutta), and Utah chub (Gilia atraria) but lacks cutthroat trout. Analysis of otter scat from Yellowstone Lake implicated trout (lake or cutthroat trout) as a major prey item (57% of scat), whereas stable isotopes identified longnose suckers (Catostomus catostomus) as the primary prey there (58% of diet). By contrast, scat from Lewis Lake implicated minnows, presumably Utah chub, as the primary prey for otters occupying that lake (86%), while stable isotopes implicated brown trout (64%) over both lake trout and Utah chub (36% combined). Our data establish the importance of alternative prey to otters and suggest that lake trout-induced reductions in cutthroat trout may not be catastrophic for otter populations here. These data do not necessarily exonerate lake trout, as their impact on other species, most notably grizzly bears (Ursus arctos) and piscivorous birds, has been documented to be substantial, and further data on the nutritional value of alternate prey are required to confirm or refute a working hypothesis that otter populations will continue to thrive in the face of the lake trout invasion.
Author : Chris Hunt
Publisher : Arcadia Publishing
ISBN 13 : 1439667128
Total Pages : 151 pages
Book Rating : 4.4/5 (396 download)
Download or read book Catching Yellowstone's Wild Trout written by Chris Hunt and published by Arcadia Publishing. This book was released on 2019-06-17 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This history and guide to the fly-fishing waters of Yellowstone National Park is a loving homage to the region’s iconic wild trout. Yellowstone National Park is home to some of the most storied destinations in the history of fly fishing. Casting in the Firehole River is like going back in time to when bison roamed nearly every meadow in the West. Restored to their natal streams after near extinction, native Arctic grayling can once again be plucked from icy water at the foot of breathtaking waterfalls. Meanwhile, a daylong hike into true wild country rewards an angler with a chance to catch trophy native cutthroat trout on a lonely mountain lake. In Catching Yellowstone’s Wild Trout, local journalist and experienced angler Chris Hunt explores the rich history of these beloved and bountiful waters.
Author : Greg French
Publisher : Patagonia
ISBN 13 : 1938340582
Total Pages : 268 pages
Book Rating : 4.9/5 (383 download)
Download or read book The Imperiled Cutthroat written by Greg French and published by Patagonia. This book was released on 2016-05-16 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Yellowstone, the world’s first national park and one of America’s truly great trout fisheries, has been a crucible for ideas on how to look after wild places. Renowned Australian fishing writer Greg French gives a sparkling firsthand account of how the park’s history, landscapes, wildlife, and people have touched anglers worldwide — and why this matters. The Imperiled Cutthroat is a travelogue that covers the story of the Yellowstone cutthroat trout: its discovery, biology, decimation, modern-day allure, and uncertain future. Although set against the dramatic backdrop of Yellowstone, comparisons to Australia, New Zealand, and Europe are inevitable. It is a cautionary tale too, ending up in Mongolia, which is as pristine as Montana once was. The Yellowstone fishery is at a crossroads, and debate about what to do is dangerously narrow. Anglers everywhere need to be constantly reminded that hatcheries are far from a panacea for ailing fisheries: fostering conservation of the natural environmental delivers far better outcomes at a fraction of the cost. The power of Greg’s stories comes not just from the quality of the writing but also from the quirks and passions of the people he meets. Greg's compelling storytelling enthralls anglers and naturalists the world over.
Author :
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (319 download)
Download or read book Conservation Assessment for Inland Cutthroat Trout written by and published by . This book was released on 1995 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gary David Blount
Publisher : [email protected]
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4./5 ( download)
Download or read book Yellowstone River - Yellowstone National Park, USA written by Gary David Blount and published by [email protected]. This book was released on with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Normal 0 The Yellowstone River within Yellowstone National Park is the world’s best Yellowstone Cutthroat Trout fishery. The Yellowstone River within the park can be divided into three-distinctive sections. The headwaters of the Yellowstone River begin on the east side of the Continental Divide from the Shoshone Mountain Range of Wyoming. The Yellowstone River flows northerly into Yellowstone Lake, elevation 7,733-feet. Yellowstone Lake is the largest lake at this elevation on the continent. The mid-section of the Yellowstone River, which flows out of Yellowstone Lake downstream to the Upper Falls of the Yellowstone River lies the world renown section of the Yellowstone River where hundreds of people flock to on July 15th “Opening Day” every year. The lower section, below the Lower Falls of the Yellowstone River flows through the Canyon of the Yellowstone downstream to the Yellowstone National Park Boundary, by the town of Gardner, Montana is probably the least fished section of the Yellowstone River. The fishing seasons opens July 15th every year which allows the Yellowstone Cutthroat Trout Brood Stock to spawn and gives the Yellowstone Cutthroat Fry time to emerge from the redds before the wade fishermen can step on them. The headwaters and mid-section of the Yellowstone River are the major spawning areas for the Yellowstone Lake Cutthroat Trout Fishery. The Yellowstone River is a premiere dry fly fishing river with prolific hatches of May Flies: Early Blue-Winged Olive (Baetis tricaudatus), Late Blue-Winged Olive (Baetis parvus), Little Western Blue-Winged Olive (Ephemerella margarita), Western Green Drake (Drunella grandis), Pale Morning Dun (Ephemerella inermis and Ephemerella infrequens) and Small Western Green Drake (Ephemerella flavilinea); Stone Flies: Salmon Fly (Pteronarcys californica), Western Big Golden Stone Fly (Calineuria californica), Western Medium Golden Brown Stone Fly (Isoperla sp.) and Little Yellow Stone Fly (Alloperla pallidula); Caddis: Green Sedge (Ryacophila sp.), Little Tan Short Horn Sedge (Glossosoma sp.), Spotted Sedge (Hydropsyche sp.) and Giant Orange Sedge (Dicosmoecus sp.).
Download or read book National Parks written by and published by . This book was released on 1998-05 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flagship publication of the National Parks Conservation Association, National Parks Magazine (circ. 340,000) fosters an appreciation of the natural and historic treasures found in the national parks, educates readers about the need to preserve those resources, and illustrates how member contributions drive our organization's park-protection efforts. National Parks Magazine uses images and language to convey our country's history and natural landscapes from Acadia to Zion, from Denali to the Everglades, and the 387 other park units in between.
Author : Jack S. Griffith
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (569 download)
Download or read book Ecology and Population Abundance of Cutthroat Trout in the Yellowstone River, Yellowstone National Park written by Jack S. Griffith and published by . This book was released on 1982 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Pat Trotter
Publisher : Univ of California Press
ISBN 13 : 9780520254589
Total Pages : 572 pages
Book Rating : 4.2/5 (545 download)
Download or read book Cutthroat written by Pat Trotter and published by Univ of California Press. This book was released on 2008 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cutthroat tells the full story of the genuine native trout of the American West. This new edition, thoroughly revised and updated after 20 years, synthesizes what is currently known about one of our most interesting and colorful fishes, includes much new information on its biology and ecology, asks how it has fared in the last century, and looks toward its future. In a passionate and accessibly written narrative, Patrick Trotter, fly fisher, environmental advocate, and science consultant, details the evolution, natural history, and conservation of each of the cutthroat's races and incorporates more personal reflections on the ecology and environmental history of the West's river ecosystems. The bibliography now includes what may be the most comprehensive and complete set of references available anywhere on the cutthroat trout. Written for anglers, nature lovers, environmentalists, and students, and featuring vibrant original illustrations by Joseph Tomelleri, this is an essential reference for anyone who wants to learn more about this remarkable, beautiful, and fragile western native.
Author : John D. Varley
Publisher : Stackpole Books
ISBN 13 : 9780811727778
Total Pages : 170 pages
Book Rating : 4.7/5 (277 download)
Download or read book Yellowstone Fishes written by John D. Varley and published by Stackpole Books. This book was released on 1998 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This richly illustrated and thoroughly researched reference covers all the species of fish and every aspect of their existence in one of the most famous sport fisheries in the world. This edition includes new material on the impact of forest fires and the introduction of non-native species; an expanded chapter on angling; and an assessment of recent management policies. Full color plates and historic b&w photos.
Author : Hunt Janin
Publisher : McFarland
ISBN 13 : 1476644063
Total Pages : 205 pages
Book Rating : 4.4/5 (766 download)
Download or read book Yellowstone written by Hunt Janin and published by McFarland. This book was released on 2021-12-13 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: Yellowstone National Park is the focal point of the 22-million-acre, multifaceted Greater Yellowstone Ecosystem, located in northwestern Wyoming and in parts of eastern Idaho and Montana. Yellowstone has a uniquely American identity as a place where nature--largely untouched and unmanaged--is allowed to flourish. This is a detailed survey that blends Yellowstone's past into its present and explores its likely future. It covers the first inhabitants of the area; the explorers and visionary conservationists who first brought Yellowstone to public attention; the unsung early heroes of the park's ranger service; and the flora, fauna, and spectacular geology of the region. The book also covers the possible future paths for the park in light of global climate change.
Author : Daniel J. Schill
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (13 download)
Download or read book Hooking Mortality of Cutthroat Trout in a Catch-and-release Segment of the Yellowstone River, Yellowstone National Park written by Daniel J. Schill and published by . This book was released on 1986 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ross V. Bulkley
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.3/5 (91 download)
Download or read book Natural Variation in Spotting, Hyoid Teeth Counts, and Coloration of Yellowstone Cutthroat Trout written by Ross V. Bulkley and published by . This book was released on 1963 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Differences in hyoid teeth and spotting counts among samples from four related populations of Yellowstone cutthroat trout, Salmo clarki lewisi Girard, reached species and subspecies levels as defined by some workers. Body coloration varied significantly among fish in six spawning runs of Yellowstone Lake, Wyo. The use of coloration, spotting, and hyoid teeth counts in cutthroat trout for taxonomic purposes needs reevalution.
