Results 51 to 60 of about 432 (147)

Correcting for measurement errors in a long‐term aerial survey with auxiliary photographic data

Ecosphere, Volume 15, Issue 8, August 2024.
Abstract Long‐term, large‐scale monitoring of wildlife populations is an integral part of conservation research and management. However, some traditional monitoring protocols lack the information needed to account for sources of measurement error in data analyses.
Jamie L. Brusa, Matthew T. Farr, Joseph Evenson, Emily Silverman, Bryan Murphie, Thomas A. Cyra, Heather J. Tschaekofske, Kyle A. Spragens, Sarah J. Converse   +8 more
wiley   +1 more source

Factors affecting feed conversion ratios in US commercial catfish production ponds

Journal of the World Aquaculture Society, Volume 55, Issue 3, June 2024.
Abstract Feed conversion ratio (FCR) is widely used as a measure of feed use efficiency in commercial aquaculture production and research. Surprisingly, little work has focused on the factors that affect FCR in plankton‐based, commercial ponds despite the widespread use of FCR as a production metric.
Nathan M. Stone, Carole R. Engle, Ganesh Kumar, Menghe H. Li, Shraddha Hegde, Luke A. Roy, Anita M. Kelly, Larry Dorman, Matthew S. Recsetar   +8 more
wiley   +1 more source

OBSERVATIONS ON DOUBLE-CRESTED CORMORANTS (PHALACROCORAX AURITUS) AT SPORTFISHING WATERS IN SOUTHWESTERN UTAH

, 1994
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Ottenbacher, Michael J, Hepworth, Dale K, Berg, Louis N   +2 more
openaire   +1 more source

The effects of depth, temperature and food ingestion on the foraging energetics of a diving endotherm, the double-crested cormorant(Phalacrocorax auritus) [PDF]

Journal of Experimental Biology, 2006
SUMMARYAvian divers are confronted with a number of physiological challenges when foraging in cold water, especially at depth. Besides the obvious constraint imposed by the necessity to return to the surface for gas exchange, cold water temperatures and a reduction in body insulation due to the increase in pressure with dive depth will elevate the ...
Enstipp, M.R., Grémillet, D., Jones, D.R.   +2 more
openaire   +3 more sources

Acoustic telemetry tracking of Coho Salmon smolts released from a community‐run hatchery into a marine inlet reveals low early ocean survival

North American Journal of Fisheries Management, Volume 44, Issue 2, Page 359-376, April 2024.
Abstract Objective Hatcheries are used to help supplement populations of Pacific salmon Oncorhynchus spp. for conservation and fisheries purposes and to provide stewardship opportunities. In British Columbia, small community‐run hatcheries typically focus on the latter and generally do not know the efficacy of their release approaches, unlike larger ...
Adam M. Kanigan, Scott G. Hinch, Andrew G. Lotto, Kamil Szlachta, Stephen D. Johnston, Stephanie A. Lingard   +5 more
wiley   +1 more source

Experimental and modeled thermoregulatory costs of repeated sublethal oil exposure in the Double-crested Cormorant, Phalacrocorax auritus

Marine Pollution Bulletin, 2018
To fully understand the impact of oil exposure, it is important to understand sublethal effects like how increased thermoregulatory costs may affect survival and reproduction. However, it is difficult and time-consuming to measure these effects in wild animals. We present a novel use of a bioenergetics model, Niche Mapper™, to estimate thermoregulatory
Mathewson, Paul D., Hanson-Dorr, Katie C., Porter, Warren P., Bursian, Steven J., Dean, Karen M., Healy, Kate, Horak, Katherine, Link, Jane E., Harr, K. E., Dorr, Brain S.   +9 more
openaire   +3 more sources

Quantifying impacts of harbor seal Phoca vitulina predation on juvenile Coho Salmon in the Strait of Georgia, British Columbia

Marine and Coastal Fisheries, Volume 16, Issue 1, February 2024.
Abstract Objective Coho Salmon Oncorhynchus kisutch provide an important resource for recreational, commercial, and Indigenous fisheries in the Pacific Northwest. The goal of this study was to improve our understanding of how marine mammal predation may be impacting the survival and productivity of Coho Salmon in the Strait of Georgia, British Columbia.
Benjamin W. Nelson, Murdoch K. McAllister, Andrew W. Trites, Austen C. Thomas, Carl J. Walters   +4 more
wiley   +1 more source

Reprint of: Development of methods for avian oil toxicity studies using the double crested cormorant ( Phalacrocorax auritus )

Ecotoxicology and Environmental Safety, 2017
Oral and external dosing methods replicating field exposure were developed using the double crested cormorant (DCCO) to test the toxicity of artificially weathered Deepwater Horizon Mississippi Canyon 252 oil. The majority of previous oil dosing studies conducted on wild-caught birds used gavage methods to dose birds with oil and determine toxicity ...
Fred, Cunningham, Karen, Dean, Katie, Hanson-Dorr, Kendal, Harr, Kate, Healy, Katherine, Horak, Jane, Link, Susan, Shriner, Steven, Bursian, Brian, Dorr   +9 more
openaire   +2 more sources

Historic Populations of the Double-crested Cormorant (Phalacrocorax auritus): Implications for Conservation and Management in the 21st Century

Waterbirds, 2006
Abstract In North America, the Double-crested Cormorant (Phalacrocorax auritus) is currently abundant, widely distributed across five broad geographic regions, and often perceived as overabundant. In many U.S. states and Canadian provinces, policy makers are pressured to significantly reduce cormorant numbers, primarily to minimize conflicts between ...
Linda R. Wires, Francesca J. Cuthbert
openaire   +1 more source

Relationships Between Blood Mercury Concentrations and Oxidative Stress in Phalacrocorax auritus

, 2013
Mercury (Hg) is a widespread contaminant that has been shown to induce adverse health effects in a wide range of organisms. We explored the relationship between total blood Hg concentrations ([Hg]) and oxidative stress induction in double-crested cormorants (Phalacrocorax auritus). Cormorant blood was sampled at five sites across the Great Lakes basin,
Gibson, Laura A., Lavoie, Raphael A., Campbell, M. Linda, Langlois, Valerie S.   +3 more
openaire   +1 more source