Feeding Habits Of Yellowstone River Otters On Two Lakes

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Feeding Habits of Yellowstone River Otters on Two Lakes

Author : William Ralph Wengeler
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (79 download)

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Book Synopsis Feeding Habits of Yellowstone River Otters on Two Lakes by : William Ralph Wengeler

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.

Yearly Food Habits of the River Otter in the Thompson Lakes Region, Northwestern Montana, as Indicated by Scat Analyses

Author : Kenneth R. Greer
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Yearly Food Habits of the River Otter in the Thompson Lakes Region, Northwestern Montana, as Indicated by Scat Analyses by : Kenneth R. Greer

Download or read book Yearly Food Habits of the River Otter in the Thompson Lakes Region, Northwestern Montana, as Indicated by Scat Analyses written by Kenneth R. Greer and published by . This book was released on 1953 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Impact of Nonnative Species on River Otters and Aquatic-terrestrial Linkages in Yellowstone National Park

Author : Jamie R. Crait
Publisher :
ISBN 13 : 9781303106767
Total Pages : 178 pages
Book Rating : 4.1/5 (67 download)

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Book Synopsis The Impact of Nonnative Species on River Otters and Aquatic-terrestrial Linkages in Yellowstone National Park by : Jamie R. Crait

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.)

Ecological Consequences of Invasive Lake Trout on River Otters in Yellowstone National Park

Author : William Ralph Wengeler
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis Ecological Consequences of Invasive Lake Trout on River Otters in Yellowstone National Park by : William Ralph Wengeler

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.

The Lake Charr Salvelinus namaycush: Biology, Ecology, Distribution, and Management

Author : Andrew M. Muir
Publisher : Springer Nature
ISBN 13 : 3030622592
Total Pages : 526 pages
Book Rating : 4.0/5 (36 download)

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Book Synopsis The Lake Charr Salvelinus namaycush: Biology, Ecology, Distribution, and Management by : Andrew M. Muir

Download or read book The Lake Charr Salvelinus namaycush: Biology, Ecology, Distribution, and Management written by Andrew M. Muir and published by Springer Nature. This book was released on 2021-03-03 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lake charr Salvelinus namaycush is a ubiquitous member of cold-water lake ecosystems in previously glaciated regions of northern continental U.S., Alaska, and Canada that often support important commercial, recreational, and subsistence fisheries. The lake charr differs from other charrs by its large size, longevity, iteroparity, top-predator specialization, reduced sexual dimorphism, prevalence of lacustrine spawning, and use of deepwater habitat. The species is remarkably variable in phenotype, physiology, and life history, some of which is reflected in its ecology and genetics, with as many as four morphs or ecotypes co-occurring in a single lake. The lake charr is often the top predator in these systems, but is highly adaptable trophically, and is frequently planktivorous in small lakes. The lake charr by their name highlights their common habitat, lakes both large and small, but often frequents rivers and occasionally moves into the Arctic Ocean. Movement and behaviour of lake charr are motivated by access to cool, well-oxygenated water, foraging opportunities, predator avoidance, and reproduction. Owing to their broad distribution and trophic level, the lake charr serves as a sentinel of anthropogenic change. This volume will provide an up-to-date summary of what is currently known about lake charr from distribution to genetics to physiology to ecology. The book provides a compilation and synthesis of available information on the lake charr, beginning with an updated distribution and a revised treatment of the paleoecology of the species. Understanding of ecological and genetic diversity and movement and behaviour of the species has advanced remarkably since the last major synthesis on the species over 40 years ago. Mid-sections of the book provide detailed accounts of the biology and life history of the species, and later sections are devoted to threats to conservation and fishery management practices used to ensure sustainability. A new standard lake charr-specific terminology is also presented. The book will be a valuable reference text for biologists around the world, ecologists, and fishery managers, and of interest to the angling public.

Yellowstone Fishes

Author : John D. Varley
Publisher : Stackpole Books
ISBN 13 : 9780811727778
Total Pages : 170 pages
Book Rating : 4.7/5 (277 download)

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Book Synopsis Yellowstone Fishes by : John D. Varley

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.

The Seasonal Feeding Habits of the River Otter (Lutra Canadensis) in Ditches of the Great Dismal Swamp

Author : Ronnie M. Pierce
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (619 download)

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Book Synopsis The Seasonal Feeding Habits of the River Otter (Lutra Canadensis) in Ditches of the Great Dismal Swamp by : Ronnie M. Pierce

Download or read book The Seasonal Feeding Habits of the River Otter (Lutra Canadensis) in Ditches of the Great Dismal Swamp written by Ronnie M. Pierce and published by . This book was released on 1979 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Yellowstone Insider for Families 2017

Author : Sean Reichard
Publisher : New West Books
ISBN 13 : 9781938532313
Total Pages : 208 pages
Book Rating : 4.5/5 (323 download)

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Book Synopsis Yellowstone Insider for Families 2017 by : Sean Reichard

Download or read book Yellowstone Insider for Families 2017 written by Sean Reichard and published by New West Books. This book was released on 2017-03-28 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taking the family to Yellowstone National Park is a once-in-a-lifetime adventure. With a little planning and guidance from Yellowstone Insider for Families, parents can map out a visit built around family-friendly activities. This book from the editor of the Yellowstoneinsider.com website covers all the ins and outs of family travel in America's First National Park. Designed to be used on the go, the eBook answers your questions about Yellowstone, kids, and travel echoing a different time in American history, What are the must-do Yellowstone activities for kids? What thermal areas are best suited for strollers and youngsters? How do you structure a Yellowstone tour in this age of digital entertainment and devices?

Fishing Bridge Campsite Replacement Project, Yellowstone National Park, Fremont County [ID], Park County

Author :
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Fishing Bridge Campsite Replacement Project, Yellowstone National Park, Fremont County [ID], Park County by :

Download or read book Fishing Bridge Campsite Replacement Project, Yellowstone National Park, Fremont County [ID], Park County written by and published by . This book was released on 1994 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Indirect Effects of Bioinvasions in Yellowstone Lake: The Response of River Otters to Declines in Native Cutthroat Trout

Author : Jamie R. Crait
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis Indirect Effects of Bioinvasions in Yellowstone Lake: The Response of River Otters to Declines in Native Cutthroat Trout by : Jamie R. Crait

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.

Global Otter Conservation Strategy

Author : Nicole Duplaix
Publisher :
ISBN 13 : 9780692042229
Total Pages : pages
Book Rating : 4.0/5 (422 download)

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Book Synopsis Global Otter Conservation Strategy by : Nicole Duplaix

Download or read book Global Otter Conservation Strategy written by Nicole Duplaix and published by . This book was released on 2018-11 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Knowing Yellowstone

Author : Jerry Johnson
Publisher : Rowman & Littlefield
ISBN 13 : 1589795229
Total Pages : 185 pages
Book Rating : 4.5/5 (897 download)

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Book Synopsis Knowing Yellowstone by : Jerry Johnson

Download or read book Knowing Yellowstone written by Jerry Johnson and published by Rowman & Littlefield. This book was released on 2010-06-16 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: Visitors to Yellowstone National Park are drawn to the spectacular scenery, unique thermal features, and the large numbers of wild animals easily observed in their natural habitat. The thoughtful visitor to the park cannot help but be captivated by the unparalleled breadth of scientific knowledge needed to understand the intricate interrelationships that make up the yellowstone landscape. Knowing Yellowstone explores how scientists discover what they know about America's first national park and the surrounding lands. The chapter authors are scientists who represent the best of their fields of study. The science they describe is leading the way to our understanding of complex ecosystems worldwide.

Yellowstone Treasures

Author : Janet Chapple
Publisher : Granite Peak Publications
ISBN 13 : 173310321X
Total Pages : 455 pages
Book Rating : 4.7/5 (331 download)

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Book Synopsis Yellowstone Treasures by : Janet Chapple

Download or read book Yellowstone Treasures written by Janet Chapple and published by Granite Peak Publications. This book was released on 2020-04-02 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book makes you the tour guide for your group! Janet Chapple shares her tips to pack for your trip, spot wildlife, see the best views, catch geyser eruptions, stay safe, and escape the crowds. The author's passion for the park, which began when her parents worked at Old Faithful Inn in the early twentieth century, shines throughout. Whether you want to hike in the geyser basins and forests, drive the mountain passes, ride horseback, or take a boat out on the lake, the mile-by-mile road logs prepare you. The description is enlivened by entertaining historical anecdotes. This sixth edition, fully updated for 2020 by editor Beth Chapple and geologist Jo-Ann Sherwin, includes which geysers and hot springs are active, the new overlooks at Grand Prismatic Spring and the south rim of the canyon, a new time line of the geology, and explanations of the geological forces like lava flows and the Yellowstone hot spot. The book is in full color with 38 new and revised maps. Charts of the facilities and a field guide to the wildlife and wildflowers round out this comprehensive guide to America's first national park. After the first edition won Gold in the Travel Guides category in ForeWord Magazine's 2002 Book of the Year Awards, later editions won Silver in the IBPA Benjamin Franklin Awards in 2010 and 2018.

Lewis and Clark on the Great Plains

Author :
Publisher : U of Nebraska Press
ISBN 13 : 9780803276185
Total Pages : 164 pages
Book Rating : 4.2/5 (761 download)

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Book Synopsis Lewis and Clark on the Great Plains by :

Download or read book Lewis and Clark on the Great Plains written by and published by U of Nebraska Press. This book was released on 2003-01-01 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: A beautifully rendered reference guide to the Great Plains portion of the famous expedition through the American West highlights the explorer's remarkable encounters with previously undocumented flora and fauna as they moved through the Plains region. Original. (Biology & Natural History)

Wyoming Wildlife: A Natural History

Author : Paul Johnsgard
Publisher : Lulu.com
ISBN 13 : 1609621506
Total Pages : 246 pages
Book Rating : 4.6/5 (96 download)

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Book Synopsis Wyoming Wildlife: A Natural History by : Paul Johnsgard

Download or read book Wyoming Wildlife: A Natural History written by Paul Johnsgard and published by Lulu.com. This book was released on 2019-06-30 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book surveys Wyoming's mammal, bird, reptile, and amphibian faunas. In addition to introducing the state's geography, geology, climate, and major ecosystems, it provides 65 biological profiles of 72 mammal species, 195 profiles of 196 birds, 9 profiles of 12 reptiles, and 6 profiles of 9 amphibians. There are also species lists of Wyoming's 117 mammals, 445 birds, 22 reptiles, and 12 amphibians. Also included are descriptions of nearly 50 national and state properties, including parks, forests, preserves, and other public-access natural areas in Wyoming. The book includes a text of more than 150,000 words, nearly 700 references, a glossary of 115 biological terms, nearly 50 maps and line drawings by the author, and 33 color photographs by Thomas D. Mangelsen.

Amphibians & Reptiles of Yellowstone and Grand Teton National Parks

Author : Edward D. Koch
Publisher :
ISBN 13 :
Total Pages : 214 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Amphibians & Reptiles of Yellowstone and Grand Teton National Parks by : Edward D. Koch

Download or read book Amphibians & Reptiles of Yellowstone and Grand Teton National Parks written by Edward D. Koch and published by . This book was released on 1995 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes color photographs of species described, simplified identification key, color range maps, official form for reporting observed species, and extensive bibliographic references.

American Serengeti

Author : Dan Flores
Publisher : University Press of Kansas
ISBN 13 : 070062466X
Total Pages : 224 pages
Book Rating : 4.7/5 (6 download)

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Book Synopsis American Serengeti by : Dan Flores

Download or read book American Serengeti written by Dan Flores and published by University Press of Kansas. This book was released on 2017-01-16 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: America's Great Plains once possessed one of the grandest wildlife spectacles of the world, equaled only by such places as the Serengeti, the Masai Mara, or the veld of South Africa. Pronghorn antelope, gray wolves, bison, coyotes, wild horses, and grizzly bears: less than two hundred years ago these creatures existed in such abundance that John James Audubon was moved to write, "it is impossible to describe or even conceive the vast multitudes of these animals." In a work that is at once a lyrical evocation of that lost splendor and a detailed natural history of these charismatic species of the historic Great Plains, veteran naturalist and outdoorsman Dan Flores draws a vivid portrait of each of these animals in their glory—and tells the harrowing story of what happened to them at the hands of market hunters and ranchers and ultimately a federal killing program in the nineteenth and twentieth centuries. The Great Plains with its wildlife intact dazzled Americans and Europeans alike, prompting numerous literary tributes. American Serengeti takes its place alongside these celebratory works, showing us the grazers and predators of the plains against the vast opalescent distances, the blue mountains shimmering on the horizon, the great rippling tracts of yellowed grasslands. Far from the empty "flyover country" of recent times, this landscape is alive with a complex ecology at least 20,000 years old—a continental patrimony whose wonders may not be entirely lost, as recent efforts hold out hope of partial restoration of these historic species. Written by an author who has done breakthrough work on the histories of several of these animals—including bison, wild horses, and coyotes—American Serengeti is as rigorous in its research as it is intimate in its sense of wonder—the most deeply informed, closely observed view we have of the Great Plains' wild heritage.