Double-crested Cormorant (Phalacrocorax auritus)

2014 ◽  
Author(s):  
Brian S. Dorr ◽  
Jeremy J. Hatch ◽  
D. V. Weseloh
Keyword(s):  
Phalacrocorax Auritus

scholarly journals A River Otter's, Lontra canadensis, Capture of a Double-crested Cormorant, Phalacrocorax auritus, in British Columbia's Gulf Island Waters

2007 ◽  
Vol 121 (3) ◽  
pp. 325
Author(s):  
Michael H. H. Price ◽  
Clare E. Aries
Keyword(s):  
Lontra Canadensis ◽  
Phalacrocorax Auritus ◽  
River Otter ◽  
Freshwater Lakes ◽  
Marine Bird ◽  
River Otters

Direct and apparent predation events by River Otters (Lontra canadensis) on birds have been recorded on marine islands and freshwater lakes. We add to this the first known observation of a River Otter capturing a marine bird on the ocean.

Greater predation by Double-crested Cormorants on cutthroat versus rainbow trout fingerlings stocked in a Wyoming river

1999 ◽  
Vol 77 (12) ◽  
pp. 1984-1990 ◽  
Author(s):  
James R Lovvorn ◽  
Daniel Yule ◽  
Clayton E Derby
Keyword(s):  
Rainbow Trout ◽  
Cutthroat Trout ◽  
Phalacrocorax Auritus ◽  
Limited Data ◽  
Platte River ◽  
The North ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Oncorhynchus Clarki Bouvieri ◽  
Pelecanus Erythrorhynchos ◽  
Yellowstone Cutthroat Trout

We studied the relative vulnerability of Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri) versus rainbow trout (Oncorhynchus mykiss) stocked as fingerlings in the North Platte River, Wyoming, to Double-crested Cormorant (Phalacrocorax auritus) predation. Cutthroat fingerlings decreased as a fraction of the population from stocking in late June to electrofishing surveys in the following October and March. In contrast, the fraction of cutthroat fingerlings among tagged fingerlings eaten by cormorants collected on the river was significantly greater than that in the population when originally stocked. More limited data from pellets regurgitated by adult cormorants at a nearby colony and in American White Pelicans (Pelecanus erythrorhynchos) collected on the river showed the same trend toward greater percentages of cutthroat trout being consumed than were present among trout stocked. There were no differences in cormorant predation rates on the Eagle Lake strain of rainbow trout reared under shaded versus partially shaded conditions, or between Auburn and Bar BC strains of Snake River (Yellowstone) cutthroat trout. On the North Platte River, cutthroat trout fingerlings were more susceptible to cormorant predation than rainbow trout of similar size that were stocked simultaneously.

scholarly journals Reproductive Characteristics of Double-Crested Cormorants (Phalacrocorax auritus) in the Eastern United States: Demographic Information for an Intensely Managed Species

Waterbirds ◽  
2016 ◽  
Vol 39 (1) ◽  
pp. 81-85 ◽  
Author(s):  
Brian S. Dorr ◽  
Katie C. Hanson-Dorr ◽  
Scott C. Barras ◽  
Travis L. DeVault
Keyword(s):  
United States ◽  
Eastern United States ◽  
Phalacrocorax Auritus ◽  
Demographic Information ◽  
Reproductive Characteristics

Movement ofHypophthalmichthysDNA in the Illinois River Watershed by the Double-Crested Cormorant (Phalacrocorax auritus)

Waterbirds ◽  
2017 ◽  
Vol 40 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Michael P. Guilfoyle ◽  
Heather L. Farrington ◽  
Richard F. Lance ◽  
Katie C. Hanson-Dorr ◽  
Brian S. Dorr ◽  
...  
Keyword(s):  
Illinois River ◽  
Phalacrocorax Auritus ◽  
River Watershed

A test of an osteologically based age determination technique in the Double-crested Cormorant Phalacrocorax auritus

Ibis ◽  
2002 ◽  
Vol 144 (1) ◽  
pp. 143-146 ◽  
Author(s):  
Jack M. Broughton ◽  
Dominique Rampton ◽  
Kimberly Holanda
Keyword(s):  
Age Determination ◽  
Phalacrocorax Auritus

scholarly journals Microplastics in the diet of nestling double-crested cormorants (Phalacrocorax auritus), an obligate piscivore in a freshwater ecosystem

2019 ◽  
Vol 76 (11) ◽  
pp. 2156-2163 ◽  
Author(s):  
Cole B. Brookson ◽  
Shane R. de Solla ◽  
Kim J. Fernie ◽  
Monina Cepeda ◽  
Chelsea M. Rochman
Keyword(s):  
Great Lakes ◽  
Aquatic Ecosystems ◽  
Natural Fibres ◽  
Laurentian Great Lakes ◽  
Freshwater Ecosystem ◽  
Phalacrocorax Auritus ◽  
Marine Systems ◽  
Freshwater Systems ◽  
Diving Bird

Anthropogenic debris, namely plastic, is a concern across aquatic ecosystems worldwide, with freshwater systems being understudied relative to marine systems. In this study, we quantified and characterized debris in the diet of double-crested cormorant chicks (Phalacrocorax auritus) from three sites in two of the Laurentian Great Lakes to (i) determine whether or not the diet of double-crested cormorants in the Laurentian Great Lakes includes anthropogenic debris, (ii) characterize the size, shape, and type of debris incorporated, and (iii) examine relationships between the amount of debris ingested and their proximity to industrial–urban centres. Overall, >86% of cormorants in our study had anthropogenic debris (mostly fibers) in their digestive tracts with no correlation between site and the amount of debris ingested. The ingested debris includes microplastics, natural fibres from textiles, and other anthropogenic materials (e.g., glass). To the best of our knowledge, this is one of the first studies to examine anthropogenic debris in a diving bird in the Laurentian Great Lakes and one of few studies investigating this in freshwater birds.

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