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Long term variability in the diet and reproductive performance of penguins at Bird Island, South Georgia

first_imgInter-annual variability in diet during crèche (December to February) over 22 years (1989–2010) was examined for gentoo penguins Pygoscelis papua breeding at Bird Island, South Georgia (54°00′S, 38°03′W). Overall, diets comprised 51% crustaceans and 49% fish by mass. Crustaceans were present in 89% of samples and were the main prey (>50% by mass) in 10 years of the study. Antarctic krill Euphausia superba were present in 85% of all diet samples. Fish were present in 79% of samples and were the main prey in 12 years, with Champsocephalus gunnari and Lepidonotothen larseni the most frequently recorded species, in 51 and 33% of samples, respectively. The energy or mass of krill in the diet was the most reliable predictor of breeding success (the number of chicks fledged per breeding pair); the correlation between model-predicted and observed values was 0.58. We compared annual patterns of gentoo penguin diet variability with those of macaroni penguins Eudyptes chrysolophus breeding at the same location. Our results suggest that the availability of krill is a key source of diet variability for both species, but their diets indicate that gentoo penguins are generalist predators (feeding on pelagic and bentho-pelagic prey), while macaroni penguins are krill specialists (feeding on pelagic prey). Differences in the response to variability in key prey species is an important factor separating the ecological niches of these two sympatric krill predators.last_img read more

UVU Men’s Basketball Announces Addition of Michael Johnston To Staff

first_imgSeptember 13, 2019 /Sports News – Local UVU Men’s Basketball Announces Addition of Michael Johnston To Staff FacebookTwitterLinkedInEmailOREM, Utah-Friday, Utah Valley men’s basketball head coach Mark Madsen announced the hiring of Michael Johnson as director of basketball operations for the Wolverines’ program.Johnson has spent the past three seasons as an assistant coach at NAIA school the College of Idaho.During his time with the Yotes, he helped lead them to two consecutive Cascade Conference Tournament titles and a pair of semifinal appearances at the NAIA Division II National Championship tournament.Johnson, a native of Eagle, Idaho, starred at Weber State on the Wildcats’ golf team. He was the team captain in 2014 and 2015 and honored as the Weber State Male-Scholar athlete of the year award winner in 2015.In 2015-16, he worked as a student manager/assistant for the Wildcats’ men’s basketball team and helped lead the squad to a Big Sky Conference tournament championship and an appearance in the NCAA Tournament.Johnson earned a bachelor’s degree from Weber State in business administration in 2015 and has a wife, Katie. Brad James Written by Tags: College of Idaho/Mark Madsen/Michael Johnson/UVU Men’s Basketballlast_img read more