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Double Crested Cormorant Phalacrocorax Auritus Breeding Population Trends And Colony Site Selection In Northern Lakes Michigan And Huron During Recovery From Extirpation 1970 2001
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Book Synopsis Double-crested Cormorant (Phalacrocorax Auritus) Breeding Population Trends and Colony Site Selection in Northern Lakes Michigan and Huron During Recovery from Extirpation (1970-2001) by : Dale Richard Trexel
Download or read book Double-crested Cormorant (Phalacrocorax Auritus) Breeding Population Trends and Colony Site Selection in Northern Lakes Michigan and Huron During Recovery from Extirpation (1970-2001) written by Dale Richard Trexel and published by . This book was released on 2003 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Status of the Double-Crested Cormorant (Phalacrocorax Auritus) in North America by : Linda Wires
Download or read book Status of the Double-Crested Cormorant (Phalacrocorax Auritus) in North America written by Linda Wires and published by CreateSpace. This book was released on 2013-05-31 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: The final report to the U.S. Fish and Wildlife Service regarding the Status of the Double-Crested Cormorant (Phalacrocorax Auritus) in North America
Book Synopsis Population Growth of the Double-crested Cormorant (Phalacrocorax Auritus) and Its Potential for Affecting Sport Fisheries in Eastern Lake Ontario by : Janet R. Carroll
Download or read book Population Growth of the Double-crested Cormorant (Phalacrocorax Auritus) and Its Potential for Affecting Sport Fisheries in Eastern Lake Ontario written by Janet R. Carroll and published by . This book was released on 1988 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Double-Crested Cormorant by : Linda R. Wires
Download or read book The Double-Crested Cormorant written by Linda R. Wires and published by Yale University Press. This book was released on 2014-04-29 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the roots of the human-cormorant conflict and assesses the federal policies that have been developed to manage the bird's population in the twenty-first century.
Book Synopsis Double-crested Cormorants (Phalacrocorax Auritus) and Brandt's Cormorants (P Penicillatus) Breeding at East Sand Island in the Columbia River Estuary by : Adam Peck-Richardson
Download or read book Double-crested Cormorants (Phalacrocorax Auritus) and Brandt's Cormorants (P Penicillatus) Breeding at East Sand Island in the Columbia River Estuary written by Adam Peck-Richardson and published by . This book was released on 2017 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Double-crested cormorants (Phalacrocorax auritus) and Brandt's cormorants (P. penicillatus) nest sympatrically in a large mixed-species colony on East Sand Island (ESI) in the Columbia River estuary. Ecological theory predicts that such morphologically similar species will partition prey resources when faced with resource limitations. During the summer of 2014, I investigated local movements, foraging dive behavior, and foraging habitat selection by breeding adults of both cormorant species using GPS tags with integrated temperature and depth data-loggers (GPS-TDlog, Earth & Ocean Technologies). The overall foraging areas and core foraging areas (defined as the 95% and 50% kernel density estimates of dive locations, respectively) of double-crested cormorants were much larger and covered a broader range of estuarine habitats than those of Brandt's cormorants. Only 26% and 27% of the overall and core foraging areas, respectively, for double-crested cormorants overlapped with those of Brandt's cormorants. Most of the overall and core foraging areas of Brandt's cormorants (59% and 89%, respectively) overlapped with those of double-crested cormorants, however. Within areas of overlap, Brandt's cormorants tended to dive deeper (median depth = 6.48 m) than double-crested cormorants (median depth = 2.67 m), and selected dive locations where the water was deeper. After accounting for local water depth, Brandt's cormorants utilized a deeper, more benthic portion of the water column than did double-crested cormorants. Our results indicate that species-specific patterns of foraging habitat utilization likely reflect past evolutionary divergence in foraging niche and evolved differences in behavioral and physiological adaptations, resulting in some partitioning of prey resources that would mitigate interspecific competition. Nevertheless, the substantial overlap in foraging habitat between the two cormorant species, particularly for Brandt's cormorants, suggests that superabundant prey resources allow these two large and productive cormorant colonies to coexist on a single island near the mouth of the Columbia River. Annual consumption of millions of out-migrating juvenile salmonids (Oncorhynchus spp.), including smolts from populations listed under the U.S. Endangered Species Act, by double-crested cormorants nesting at ESI motivated natural resource managers to investigate potential management techniques to reduce cormorant predation by reducing the size of the breeding colony. To better understand potential dispersal of cormorants from the ESI colony due to management to reduce colony size, satellite transmitters were fitted on 83 double-crested cormorants captured on the ESI colony before egg-laying in 2013. Dispersal from ESI immediately following tagging was nearly ubiquitous, but temporary, and provided limited information on where cormorants might prospect for alternative nest sites if prevented from nesting on ESI. During this initial pre-nesting period, tagged cormorants were detected at colonies and roost sites as far from ESI as the Puget Sound region of coastal Washington; nevertheless, all but 4% of tagged cormorants returned to ESI within 2 weeks of being tagged. Following the subsequent breeding season, tagged cormorants staged at several nearby estuaries before migrating both north and south from ESI to overwinter in areas from British Columbia to northwestern Mexico; only 3% overwintered in the Columbia River estuary. Tracking data revealed substantial connectivity between the ESI colony and other colonies and regions within the range of the western North America population, suggesting the potential for widespread dispersal throughout the population's breeding range if nesting habitat on ESI was reduced or eliminated. Dispersal did not extend across the Cascade-Sierra Divide, however; greater connectivity existed with estuary locations throughout the range and particularly with more proximate estuaries that served as post-breeding staging areas. Surprisingly low regional and colony connectivity was observed with the Oregon Coast, despite numerous active and historical colonies in that region, as well as proximity to the colony at ESI. The strong philopatry to ESI that nearly all tagged cormorants exhibited, however, suggests that few alternative nesting opportunities are as attractive for prospecting double-crested cormorants as the ESI colony site.
Book Synopsis The Home-life and Economic Status of the Double-crested Cormorant Phalacrocorax Auritus Autitus (Lesson) by : Howard Lewis Mendall
Download or read book The Home-life and Economic Status of the Double-crested Cormorant Phalacrocorax Auritus Autitus (Lesson) written by Howard Lewis Mendall and published by . This book was released on 1936 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Foraging Ecology, Bioenergetics and Predatory Impact of Breeding Double-cresed Cormorants (Phalacrocorax Auritus) in the Beaver Archipelago, Northern Lake Michigan by : Nancy E. Seefelt
Download or read book Foraging Ecology, Bioenergetics and Predatory Impact of Breeding Double-cresed Cormorants (Phalacrocorax Auritus) in the Beaver Archipelago, Northern Lake Michigan written by Nancy E. Seefelt and published by . This book was released on 2005 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reproduction and Developmental Anomalies in Double-crested Cormorants (Phalacrocorax Auritus) on Lake Michigan by : Jill Marie Larson
Download or read book Reproduction and Developmental Anomalies in Double-crested Cormorants (Phalacrocorax Auritus) on Lake Michigan written by Jill Marie Larson and published by . This book was released on 1991 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Status Assessment of the Double-crested Cormorant (Phalacrocorax Auritus) in Western North America, 1998-2009 by : Jessica Y. Adkins
Download or read book A Status Assessment of the Double-crested Cormorant (Phalacrocorax Auritus) in Western North America, 1998-2009 written by Jessica Y. Adkins and published by . This book was released on 2010 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The geographic area included in this updated status assessment of the Western Population of double-crested cormorants extends from the Pacific Coast east to the Continental Divide, north into southern British Columbia (following the breeding range of the species), and south to the international border with Mexico. The current size of the entire western breeding population is estimated to be about 29,240 breeding pairs. The estimate for the current breeding population in British Columbia, Washington, Oregon, and California, which support the great majority of the Western Population, is approximately 26,390 breeding pairs."--From Executive Summary.
Book Synopsis Phylogeography and Population Genetic Structure of Double-crested Cormorants (Phalacrocorax Auritus) by : Dacey M. Mercer
Download or read book Phylogeography and Population Genetic Structure of Double-crested Cormorants (Phalacrocorax Auritus) written by Dacey M. Mercer and published by . This book was released on 2009 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Double-crested Cormorant (Phalacrocorax auritus) is a widespread, colonial, North American waterbird with bicoastal and inland distributions. Four subspecies have been described within North America corresponding to five geographic breeding regions: Interior and North Atlantic cormorants (P. a. auritus); Southeastern cormorants (P. a. floridanus); Alaskan cormorants (P. a. cincinnatus); and Pacific cormorants (P. a. albociliatus). Management strategies vary widely across the species' range according to local perceptions rather than relative population status. An understanding of population genetic structure is necessary for delineating appropriate management units. We examined the genetic structure of Double-crested Cormorants across their range in the United States and Canada to quantify variation within and among breeding sites and to assess the status of traditional geographically defined subspecies. Sequences (700bp) from domains I and II of the mitochondrial control region were analyzed for 234 Double-crested Cormorants from 23 breeding sites. Variation was also examined at 8 microsatellite loci for 395 cormorants from the same 23 breeding sites. The mtDNA and microsatellite data provided strong evidence that the Alaskan subspecies is genetically divergent from other populations in North America (net sequence divergence = 6.72%; [Phi]ST for mtDNA control region = 0.738; FST for microsatellite loci = 0.05). Our data also suggested strong genetic divergence in the southwestern U.S.; southern California may represent a zone of introgression resulting from a northward expansion of a unique lineage from the species' range in northwestern Mexico. In contrast, there was little support for recognition of subspecies within the conterminous U.S. and Canada, outside of Alaska. Rather than genetically distinct regions corresponding to the putative subspecies, we observed a distribution of genetic variation consistent with a pattern of gradual isolation by distance. This pattern implies that genetic differences across the range are due to geographic distance rather than discrete subspecific breaks. Although three of the four subspecies were not genetically distinct, potential demographic separation, habitat differences, and recent declines at some colonies within the regions, suggests that the Pacific and possibly the North Atlantic breeding regions may still warrant consideration as distinct populations. This thesis provides the first species-wide assessment of the phylogeography and population genetic structure of the Double-crested Cormorant. It further resulted in the first microsatellite markers developed specifically for a North American pelecaniform. The mitochondrial and microsatellite data provide a comprehensive assessment of the four putative subspecies described for the species. Given the highly varying conservation status of Double-crested Cormorants throughout their range, results of this study provide guidance for conservation and management practices on their behalf in North America.
Book Synopsis Invasive Species Sustain Double-crested Cormorants in Southern Lake Michigan by : Patrick T. Madura
Download or read book Invasive Species Sustain Double-crested Cormorants in Southern Lake Michigan written by Patrick T. Madura and published by . This book was released on 2015 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Double-crested cormorants (Phalacrocorax auritus ) have long and often been implicated in having detrimental effects on fisheries. Resulting persecution, as well as DDT water contamination, led to a major decline of the species throughout its range. Research shows that the main components of cormorant diets vary significantly among forage, invasive, or economically important fish species. A recent, rapid increase in cormorant abundance in the Great Lakes has led, in some instances, to calls for the management of cormorant populations. Thus the objective of this study was to determine the prey composition of the double-crested cormorant colony in East Chicago, Indiana. This study builds on previous work in the north basin of Lake Michigan by focusing on cormorant diet composition at their only significant nesting colony in the southern basin where cormorant diet has been unstudied. Regurgitated pellets were collected from the colony and diagnostic bones were used to elucidate diet composition. Alewife (Alosa pseudoharengus ), round goby (Neogobius melanostomus), Lepomis spp., white perch (Morone americana) and yellow perch (Perca flavescens) were the most frequently found prey items depending on cormorant breeding stage. Invasive species (i.e., alewife, round goby, white perch) contributed over ninety percent of the individuals and eighty percent of the biomass to cormorant diet over the study period. No salmonine species were detected suggesting that negative effects on this important fishery would likely occur only via direct competition for prey (e.g., alewife). Predation on yellow perch, which occurred mainly prior to and during the perch spawning season (i.e., of age-1 and older individuals), may warrant further study to quantify the effects on the local recreational yellow perch fishery. However, because yellow perch abundance is thought to be currently limited by poor recruitment at age-0, these results do not support active management of the cormorants at this colony to protect local fisheries.
Book Synopsis The Double-crested Cormorant: Biology, Conservation and Management by : D.N. Nettleship
Download or read book The Double-crested Cormorant: Biology, Conservation and Management written by D.N. Nettleship and published by . This book was released on 1997 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Charles J. Krebs Publisher :Benjamin-Cummings Publishing Company ISBN 13 :9780321068798 Total Pages :695 pages Book Rating :4.0/5 (687 download)
Download or read book Ecology written by Charles J. Krebs and published by Benjamin-Cummings Publishing Company. This book was released on 2001 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: This best-selling majors ecology book continues to present ecology as a series of problems for readers to critically analyze. No other text presents analytical, quantitative, and statistical ecological information in an equally accessible style. Reflecting the way ecologists actually practice, the book emphasizes the role of experiments in testing ecological ideas and discusses many contemporary and controversial problems related to distribution and abundance. Throughout the book, Krebs thoroughly explains the application of mathematical concepts in ecology while reinforcing these concepts with research references, examples, and interesting end-of-chapter review questions. Thoroughly updated with new examples and references, the book now features a new full-color design and is accompanied by an art CD-ROM for instructors. The field package also includes The Ecology Action Guide, a guide that encourages readers to be environmentally responsible citizens, and a subscription to The Ecology Place (www.ecologyplace.com), a web site and CD-ROM that enables users to become virtual field ecologists by performing experiments such as estimating the number of mice on an imaginary island or restoring prairie land in Iowa. For college instructors and students.
Book Synopsis Marine Birds of the Eastern United States and the Bay of Fundy by : Ian C. T. Nisbet
Download or read book Marine Birds of the Eastern United States and the Bay of Fundy written by Ian C. T. Nisbet and published by . This book was released on 2013 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph reviews the distribution and numbers of 83 marine species (31 breeding species) that occur regularly along the east coast of the US, in the Bay of Fundy, or in waters of the continental shelf. It assesses trends in numbers since 1970, threats, and research and conservation needs. It compiles data from many published and unpublished sources and has a bibliography of more than 600 entries, which should make it an invaluable reference work. Pelagic birds.
Book Synopsis Legitimacy in European Nature Conservation Policy by : Jozef Keulartz
Download or read book Legitimacy in European Nature Conservation Policy written by Jozef Keulartz and published by Springer Science & Business Media. This book was released on 2007-11-03 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building forth upon recent developments in democracy theory that have identified multiple forms of legitimacy, this volume observes a EU-wide shift from output legitimacy to input and throughput legitimacy. Nine case studies are presented, followed by extensive comments. The volume successfully integrates knowledge on a major piece of European policy in a reflexive and comprehensive manner, and combines theories of governance with theories of legitimacy.
Book Synopsis Wildlife Ecotoxicology by : John E. Elliott
Download or read book Wildlife Ecotoxicology written by John E. Elliott and published by Springer Science & Business Media. This book was released on 2011-08-27 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many books have now been published in the broad field of environmental toxicology. However, to date, none of have presented the often fascinating stories of the wildlife science, and the steps along the way from discovery of problems caused by environmental pollutants to the regulatory and non-regulatory efforts to address the problems. This book provides case by case examinations of how toxic chemical effects on wildlife have brought about policy and regulatory decisions, and positive changes in environmental conditions. Wild animal stories, whether they are about the disappearance of charismatic top predators, or of grossly deformed embryos or frogs, provide powerful symbols that can and have captured the public's imagination and have resulted in increased awareness by decision makers. It is the intent of this book to present factual and balanced overviews and summaries of the science and the subsequent regulatory processes that followed to effect change (or not). We cover a variety of chemicals and topics beginning with an update of the classic California coastal DDT story of eggshell thinning and avian reproduction to more recent cases, such as the veterinarian pharmaceutical that has brought three species of Asian vultures to the brink of extinction. Researchers, regulators, educators, NGOs and the general public will find valuable insights into the processes and mechanisms involved both in environmental scientific investigation and in efforts to effect positive change.
Book Synopsis Limnology and Aquatic Birds by : Alan R. Hanson
Download or read book Limnology and Aquatic Birds written by Alan R. Hanson and published by Springer Science & Business Media. This book was released on 2009-03-20 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-term population monitoring is an important tool in our investigations of the role waterbirds play in their environment. This book is international in scope and presents information on species as diverse as the Common Loon, Harlequin Duck, and Semi-Palmated Sandpiper, and habitat in locations ranging from Iceland to Japan. Papers presented in this volume further our understanding of the important role that limnology plays in determining habitat suitability for waterbirds.
