. | . |
Antarctic sea ice loss is good news for the continent's penguins by Brooks Hays Washington DC (UPI) Jun 25, 2020 While climate scientists worry about the loss of sea ice in Antarctica, penguins are flapping their flippers in applause. According to a new study, published this week in the journal Science Advances, many penguins prefer the Southern Ocean unfrozen -- the less sea ice, the better. Researchers had previously illuminated a link between sea ice extent in Antarctica and breeding success among Adelie penguin colonies, but a correlation doesn't prove causation, and so scientists decided to investigate further. To find out what might explain the positive impact of reduced sea ice coverage on breeding success, scientists strapped a trio of instruments to several dozen penguins. The combination of GPS trackers, accelerometers and video cameras helped scientists track how the movements and behaviors changed over the course of several years, as sea ice extents waxed and waned. "What is new in this study is that we used a variety of electronic tags to record penguin foraging behavior in the greatest detail yet, and found mechanistic link among sea ice, foraging behavior, and breeding success," lead researcher Yuuki Watanabe, scientist at the National Institute of Polar Research, told UPI in an email. The novel data revealed the ways in which ice coverage in Antarctica affects the way penguins move across their environs and access food resources. "In the ice-covered seasons, penguins traveled slowly by walking and needed to find cracks in the ice, where they dived repeatedly," Watanabe said. "They were able to dive only through cracks, which also means that the competition among penguins was severe." The data also showed that, not surprisingly, penguins move much more efficiently in the water than on ice. Adelie penguins travel four times faster by swimming than by walking. When sea extent was minimal, data showed the penguins were able to travel more easily, swimming and diving wherever they pleased. "They came back to the nest quickly, which means that chicks waiting at the nest had food more often," Watanabe said. "Overall, foraging conditions improved by the loss of sea ice, which directly linked to improved breeding success. Put very simply, penguins are happier with less sea ice because they swim." Less sea ice also allows more sunlight to enter the ocean, fueling larger krill blooms. Krill serve as the main source of food for Adelie penguins. The latest findings don't hold for all of Antarctica, and in future studies, researchers hope to explore the effects of sea ice extent on different penguin species living in different parts of the continent. "The relationship between sea ice and penguin reproductive success is apparently different in maritime Antarctica (e.g. Antarctic Peninsula) where sea ice is normally sparse," Watanabe said. "There, penguins look happier with more sea ice, but mechanics are unclear. I would like to conduct research in that region to understand the general patterns over the whole Antarctica."
Plastic 'has entered' Antarctic terrestrial food chain Paris (AFP) June 23, 2020 Scientists have found bits of polystyrene in the guts of tiny, soil-dwelling organisms in the Antarctic, raising concern that microplastics pollution has already "deeply" entered the world's most remote land-based food systems. While the infiltration of microplastics throughout the oceans is well-known, researchers said their findings provided the first evidence of contamination in the Antarctic terrestrial food chain. "Plastics have therefore entered even some of the most remote soil food webs ... read more
|
|
The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us. |