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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 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 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 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 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 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 A Science-based Initiative to Manage Double-crested Cormorant Damage to Southern Aquaculture by : James F. Glahn
Download or read book A Science-based Initiative to Manage Double-crested Cormorant Damage to Southern Aquaculture written by James F. Glahn and published by . This book was released on 2000 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 by : Dennis Wild
Download or read book The Double-Crested Cormorant written by Dennis Wild and published by University of Michigan Press. This book was released on 2012-02-08 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the story of the survival, recovery, astonishing success, and controversial status of the double-crested cormorant. After surviving near extinction driven by DDT and other contaminants from the 1940s through the early 1970s, the cormorant has made an unprecedented comeback from mere dozens to a population in the millions, bringing the bird again into direct conflict with humans. Hated for its colonial nesting behavior; the changes it brings to landscapes; and especially its competition with commercial and sports fishers, fisheries, and fish farmers throughout the Great Lakes and Mississippi Delta regions, the cormorant continues to be persecuted by various means, including the shotgun. In The Double-Crested Cormorant, Dennis Wild brings together the biological, social, legal, and international aspects of the cormorant's world to give a complete and balanced view of one of the Great Lakes' and perhaps North America's most misunderstood species. In addition to taking a detailed look at the complex natural history of the cormorant, the book explores the implications of congressional acts and international treaties, the workings and philosophies of state and federal wildlife agencies, the unrelenting efforts of aquaculture and fishing interests to "cull" cormorant numbers to "acceptable" levels, and the reactions and visions of conservation groups. Wild examines both popular preconceptions about cormorants (what kinds of fish they eat and how much) and the effectiveness of ongoing efforts to control the cormorant population. Finally, the book delves into the question of climate and terrain changes, their consequences for cormorants, the new territories to which the birds must adapt, and the conflicts this species is likely to face going forward.
Book Synopsis Status, Distribution and Habitat Affinities of Double-crested Cormorant Nesting Colonies in Wyoming by : Scott L. Findholt
Download or read book Status, Distribution and Habitat Affinities of Double-crested Cormorant Nesting Colonies in Wyoming written by Scott L. Findholt and published by . This book was released on 1988 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Double-crested Cormorants (Phalacrocorax auritus) were first reported breeding in Wyoming in 1928, when one active nest was located on Yellowstone Lake. In 1983 the Double-crested Cormorant breeding population consisted of 629 pairs in 9 colonies, and it had increased to 1477 nesting pairs in 18 colonies by 1986. The marked increase of the breeding population is associated with the construction of irrigation reservoirs. Seventy-three percent of the Double-crested Cormorant colonies in 1986 were on man-made water impoundments. Reservoirs provide isolated islands or flooded trees for nesting substrate. They also probably provide foraging habitat. Although most recent colonies were in flooded vegetation, significantly more cormorants nested on the ground. In spite of recent population increases in Wyoming, it seems unlikely that this trend will continue. Nesting habitat is currently threatened by decay of nest trees and deterioration or loss of nesting islands brought on by excessively high or low water levels. Current breeding populations need to be protected from deterioration of nesting habitat and human disturbance of breeding birds. It will be necessary for natural resource management agencies to implement appropriate management strategies to maintain viable nesting populations of Double-crested Cormorants in Wyoming.
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 Nesting Ecology of the Double-crested Cormorant (Phalacrocorax Auritus Auritus) on Utah Lake by : Ronald M. Mitchell
Download or read book Nesting Ecology of the Double-crested Cormorant (Phalacrocorax Auritus Auritus) on Utah Lake written by Ronald M. Mitchell and published by . This book was released on 1974 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spatial Ecology of Double-Crested Cormorants (Nannopteru Aritum) in Lower Green Bay, Lake Michigan by : Jacob Woulf
Download or read book Spatial Ecology of Double-Crested Cormorants (Nannopteru Aritum) in Lower Green Bay, Lake Michigan written by Jacob Woulf and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Populations of double-crested cormorant, a widespread North American colonial waterbird, have steadily increased throughout much of the species' range after historically low numbers in the 1970s. Recent increases have been particularly dramatic at the Cat Island restoration site in the southernmost portion of Green Bay, Lake Michigan. This increase has attracted the attention of recreational and commercial fishers who fear that large numbers of piscivorous birds might affect local populations of desirable fish species. This study examines the daily and seasonal movements of nesting double-crested cormorants nesting or roosting at Cat Island. GPS transmitters provided hourly bird locations and other useful data (altitude, temperature, horizontal and vertical error, and ground speed) for 10 individuals captured and released during June 2021. I evaluated activity patterns and movements of these birds during the breeding and post-breeding periods. Maps of bird coordinates reveal a high degree of individual and seasonal variation in movement patterns and feeding locations. Cormorants were most frequently found in shallow coastal waters and bays, but individuals typically exhibited unique spatial foraging patterns. Results are evaluated in the context of central place foraging, a framework where individuals come and go from an overnight roosting or nesting colony. Theoretical predictions of optimal central place foraging and the existence of a "halo" of prey depletion are difficult to evaluate in Green Bay because favored feeding sites and prey resources are patchy and unevenly distributed around the central place. A relatively high number of bird locations were recorded 5 km or more from the daily central place. This suggests that the energetic cost of travel was low and/or foraging rewards were high for distant feeding locations. Cormorants also traveled longer distances as the season progressed and nest fidelity declined. Individuals often visited other nesting colonies in northern Green Bay and the Lake Winnebago/Fox River system, suggesting that regional colonies are socially inter-connected. The highly variable and large geographic range of Green Bay cormorants implies that the ecological footprint extends across a wide geographic area, perhaps diluting impacts of this opportunistic species on local fish populations."
Book Synopsis The Double-crested Cormorant (Phalacrocorax Auritus) and Its Relation to the Salmon Industries on the Gulf of St. Lawrence [microform] by : Geological Survey of Canada
Download or read book The Double-crested Cormorant (Phalacrocorax Auritus) and Its Relation to the Salmon Industries on the Gulf of St. Lawrence [microform] written by Geological Survey of Canada and published by . This book was released on 1915 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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