Results 51 to 60 of about 38,885 (170)

Ground‐truthing of satellite imagery to assess seabird colony size: A test using Adélie penguins

Remote Sensing in Ecology and Conservation, EarlyView.
Adélie penguin colony size can be estimated from space using very high‐resolution (VHR; 0.3–0.6 m resolution) satellite imagery due to the contrast between their guano stain and the surrounding terrain. Our study assessed the utility of VHR imagery for making indirect assessments of changes in colony size.
Alexandra J. Strang, Dean P. Anderson, Esme Robinson, Grant Ballard, Annie E. Schmidt, David G. Ainley, Kerry Barton, Fiona Shanhun, Elissa Z. Cameron, Michelle A. LaRue   +9 more
wiley   +1 more source

Multidecadal warming of Antarctic waters [PDF]

, 2014
Decadal trends in the properties of seawater adjacent to Antarctica are poorly known, and the mechanisms responsible for such changes are uncertain. Antarctic ice sheet mass loss is largely driven by ice shelf basal melt, which is influenced by ocean-ice
Aoki, Shigeru, Heywood, Karen J., Schmidtko, Sunke, Thompson, Andrew F.   +3 more
core   +1 more source

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

A method to estimate prey density from single-camera images: A case study with chinstrap penguins and Antarctic krill.

PLoS ONE
Estimating the densities of marine prey observed in animal-borne video loggers when encountered by foraging predators represents an important challenge for understanding predator-prey interactions in the marine environment. We used video images collected
Victoria R Hermanson, George R Cutter, Jefferson T Hinke, Matthew Dawkins, George M Watters   +4 more
doaj   +1 more source

On the trophic fate of Phaeocystis pouchetii: VII. Sterols and fatty acids reveal sedimentation of Phaocystis-derived organic matter via krill fecal strings [PDF]

, 2001
As part of a joint project on the fate of phytoplankton in Balsfjorden in Northern Norway, we investigated the trophic fate and sedimentation potential of Phaeocystis pouchetii by tracing the transition of biomarker patterns from a phytoplankton bloom to
Hamm, Christian, Reigstad, M., Wassmann, P., Wexels-Riser, C.   +3 more
core  

Element content and daily intake from dietary supplements (nutraceuticals) based on algae, garlic, yeast fish and krill oils—Should consumers be worried? [PDF]

, 2016
The authors would like to thank Agilent Technologies for the loan of the 8800 ICP-QQQ used in this study. Michael Stiboller thanks European Union’s Lifelong Learning Programme ‘Leonardo da Vinci’: “ALUMNI UNI GRAZ MOBILITY PROGRAMME 2013-2015” for ...
Feldmann, Jorg, Gajdosechova, Zuzana, Nelson, Jenny, Raab, Andrea, Stiboller, Michael   +4 more
core   +1 more source

Rhyming in the cold: first evidence of soniferous fishes in the Southern Ocean

Remote Sensing in Ecology and Conservation, EarlyView.
The acoustic ecology of Southern Ocean fishes remains unknown due to a lack of dedicated acoustic research on the fishes of this ocean. Passive acoustic monitoring data were collected at the South African sub‐Antarctic Prince Edward Islands using an underwater acoustic recorder, and towed underwater Ski‐Monkey cameras were deployed to identify fish ...
Fannie W. Shabangu, Grant van der Heever, Charles von der Meden, Hannah Truter, Stephen J. Lamberth, Ofer Gon   +5 more
wiley   +1 more source

Nanomaterials' Multigenerational Effects by Single and Joint Exposure in Non‐mammalian Models

Environmental Toxicology, EarlyView.
ABSTRACT Nanotoxicology has mainly focused on single‐generation studies, leaving multigenerational toxicity underexplored. Having animal welfare recently gained importance, we aimed to provide the state‐of‐the‐art of knowledge about multigenerational effects in non‐mammalian models in the case of nanomaterials (NM) single and joint exposure to other ...
Andy Joel Taipe Huisa, Analía Ale, Azael Francisco Silva Neto, Lorena De Mendonça Lucena, Marcelo Estrella Josende, Milena Ferreira de Lima, Rhayanny Kethylly Pereira Santos, Martín Federico Desimone, Priscila Gubert, José María Monserrat   +9 more
wiley   +1 more source

Factors impacting the timing of reproductive development in female Antarctic krill at the northwestern Antarctic Peninsula

Frontiers in Marine Science
The northwestern Antarctic Peninsula is an important spawning, recruitment, and overwintering ground for Antarctic krill. The region is warming rapidly, and the current impacts of climate and environmental variability on the reproductive cycle of krill ...
Kirsten B. Steinke, Kim S. Bernard, Christian S. Reiss, Jennifer Walsh, Giancarlo M. Correa, Sharon E. Stammerjohn   +5 more
doaj   +1 more source

Загрязненность прибрежной экосистемы тяжелыми металлами как показатель климатических изменений в Антарктике

Український антарктичний журнал, 2020
Во время предыдущих исследований в районе Украинской антарктической станции (УАС) Академик Вернадский нами было обнаружено повышенное содержание тяжелых металлов в донных осадках и в грунтах о-вов Аргентинского архипелага и выявлена аккумуляция тяжелых ...
Ernest Z. Samyshev, Natalia I. Minkina, Yury P. Kopytov, Elena S. Chudinovskikh, Sergey M. Ignatyev   +4 more
doaj   +1 more source