Results 51 to 60 of about 6,937 (226)

Food habits of California Sea Lions (Zalophus californianus) and their impact on Salmonid Fisheries in Monterey Bay, California [PDF]

, 1999
In the ocean commercial troll and recreational salmon fishery in Monterey Bay California, California sea lions (Zalophus califomianus) will swim near or follow fishing boats and will depredate fish once hooked.
Harvey, James, T., Weise, Michael, J.
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Semi‐automated seal detection on the Western Antarctic Peninsula: an unsupervised machine learning approach for detecting ice seals in aerial survey data

Remote Sensing in Ecology and Conservation, EarlyView.
This study presents a semi‐automated, rule‐based image analysis pipeline to detect ice seals in aerial surveys of the Western Antarctic Peninsula during an unusually low sea ice year. By using simple hierarchical clustering instead of deep learning, the method substantially reduced human annotation effort while achieving 82% recall, identifying 758 ...
Claire McGinnity, Connor C.G. Bamford, Nathan Fenney, Andrew Fleming, Jaume Forcada, Michael S. Tift, Luis A. Hückstädt, Daniel P. Costa, Peter T. Fretwell   +8 more
wiley   +1 more source

Estimates of Marine Mammal, Sea Turtle, and Seabird Mortality in the California Drift Gillnet Fishery for Swordfish and Thresher Shark, 1996–2002 [PDF]

, 2004
Estimates of incidental marine mammal, sea turtle, and seabird mortality in the California drift gillnet fishery for broadbill swordfish, Xiphias gladius, and common thresher shark, Alopias vulpinus, are summarized for the 7-year period, 1996 to 2002 ...
Caretta, James V., Petersen, Don, Price, Tim, Read, Robert   +3 more
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A framework for the ethical use of animal‐borne devices in post‐release monitoring following rehabilitation

Wildlife Biology, EarlyView.
Rehabilitation and release contribute to conservation efforts for threatened species. Ensuring that these efforts are effective requires a good understanding of the factors which determine survival and integration of released animals into wild populations.
Jessica Harvey‐Carroll, Daire Carroll, Cara-Marie Trivella, Ellen Connelly   +3 more
wiley   +1 more source

Large and in charge: cortisol levels vary with sex, diet, and body mass in an Antarctic predator, the leopard seal

Frontiers in Marine Science, 2023
Evaluating physiological responses in the context of a species’ life history, demographics, and ecology is essential to understanding the health of individuals and populations.
Emily S. Sperou, Daniel E. Crocker, Renato Borras-Chavez, Renato Borras-Chavez, Renato Borras-Chavez, Daniel P. Costa, Michael E. Goebel, Michael E. Goebel, Shane B. Kanatous, Douglas J. Krause, Stephen J. Trumble, Sarah S. Kienle   +11 more
doaj   +1 more source

Seasonal variations and challenges in estimating populations and identifying species of Korean ungulates using drone‐derived thermal orthomosaic maps

Wildlife Biology, EarlyView.
Drones equipped with thermal infrared (TIR) cameras offer significant time and labor savings in estimating wild ungulate populations. However, accurately monitoring forest‐dwelling ungulates remains challenging due to their elusive behavior and complex habitat.
Jinhwi Kim, Donggul Woo
wiley   +1 more source

Pinnipeds in New York (1996–2021) are stranding less frequently but human interaction cases are increasing

NAMMCO Scientific Publications
Every year pinnipeds from five different species—gray (Halichoerus grypus), harbour (Phoca vitulina), harp (Pagophilus groenlandicus), hooded (Cystophora cristata), and ringed (Pusa hispida) seals—haul out on New York’s beaches.
Maxine Montello, Wendy McFarlane, Meghan Rickard, Joseph Warren   +3 more
doaj   +1 more source

Wind, waves, wing loading and the flight energetics of giant petrels

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Wind is a major factor driving seabird movement and energetics, the effects of which are modulated by morphology. Developments in tagging technology now make it possible to test predictions from aerodynamic theory about the effects of wind on flight performance in free ...
Madeline E. Hallet, Richard A. Phillips, Ian J. Maywar, Lesley H. Thorne   +3 more
wiley   +1 more source

Flow sensing by pinniped whiskers [PDF]

Philosophical Transactions of the Royal Society B: Biological Sciences, 2011
Beside their haptic function, vibrissae of harbour seals (Phocidae) and California sea lions (Otariidae) both represent highly sensitive hydrodynamic receptor systems, although their vibrissal hair shafts differ considerably in structure. To quantify the sensory performance of both hair types, isolated single whiskers were used to measure vortex ...
L, Miersch, W, Hanke, S, Wieskotten, F D, Hanke, J, Oeffner, A, Leder, M, Brede, M, Witte, G, Dehnhardt   +8 more
openaire   +2 more sources

Abundance and distribution of California sea lions (Zalophus californianus) in central and northern California during 1998 and summer 1999 [PDF]

, 2005
The abundance and distribution of California sea lions (Zalophus californianus) in central and northern California was studied to allow future evaluation of their impact on salmonids, the ecosystem, and f isheries.
Forney, Karin A., Lowry, Mark S.
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