Krill surplus hypothesis
Web17 dec. 2014 · The output of the Ecosim scenarios indicated that while the “krill surplus” hypothesis is a plausible explanation of the biomass trends observed in some penguin and pinniped species in the mid-20th century, the excess krill biomass was most likely eliminated by a rapid decline in primary productivity in the years 1975–1995. Webhave produced a massive surplus of Antarctic krill. This excess of krill may have allowed populations of other predators, such as seals and penguins, to increase, a top-down hypothesis known as the ‘krill surplus hypothesis’. However, a lack of pre-whaling population baselines has made it challenging to
Krill surplus hypothesis
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Web16 jan. 2024 · Pregnancy rates showed significant inter-annual variability, between 29% and 86%. Our results indicate that krill availability is in fact limiting and affecting reproductive rates, in contrast to the krill surplus hypothesis. This suggests that this population of humpback whales may be at a threshold for population growth due to prey limitations. Web10 jul. 2007 · We posit that penguins only recently began to rely on krill as a major portion of their diet, in conjunction with the removal of baleen whales and krill-eating seals during the historic whaling era. Our results support the “krill surplus” hypothesis that predicts excess krill availability in the Southern Ocean after this period ...
Web23 dec. 2024 · This excess of krill may have allowed populations of other predators, such as seals and penguins, to increase, a top-down hypothesis known as the ‘krill surplus hypothesis’. However, a lack of pre-whaling population baselines has made it challenging to investigate historical changes in the abundance of the major krill predators in relation to … Web18 mrt. 2024 · In line with the krill surplus hypothesis, we further hypothesised that competitive prey release due to the harvesting of the whales may have facilitated the demographic recovery of the South Georgia population and allowed it to attain a larger size than was present before sealing.
WebThe output of the Ecosim scenarios indicated that while the “krill surplus” hypothesis is a plausible explanation of the biomass trends observed in some penguin and pinniped species in the mid-20th century, the excess krill biomass was most likely eliminated by a rapid decline in primary productivity in the years 1975–1995. Web18 mrt. 2024 · Abstract and Figures Much debate surrounds the importance of top-down and bottom-up effects in the Southern Ocean, where the harvesting of over two million whales in the mid twentieth century is...
WebThis excess of krill may have allowed populations of other predators, such as seals and penguins, to increase, a top-down hypothesis known as the ‘krill surplus hypothesis’. However, a lack of pre-whaling population baselines has made it challenging to investigate historical changes in the abundance of the major krill predators in relation to whaling.
WebABSTRACT Abstract Intellectual Merit: The krill surplus hypothesis argues that the near-extirpation of baleen whales from Antarctic waters during much the twentieth century led to significant changes in the availability of krill for other predators. Over the past decade, however, overall krill abundance has decreased by over an order of magnitude around the … cherry republic woof whompersWebABSTRACT Abstract Intellectual Merit: The krill surplus hypothesis argues that the near-extirpation of baleen whales from Antarctic waters during much the twentieth century led to significant changes in the availability of krill for other predators. Over the past decade, however, overall krill abundance has decreased by over an order of magnitude around the … cherry pete artWebThe importance of krill to predators in the Southern Ocean and the potential for commercial krill fishing to affect these predators became central to the establishment of the ecosystem-based management approach adopted by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) (Everson 2000). cherry picker widthWebStudy with Quizlet and memorize flashcards containing terms like Weddell Seal, History of exploitation, fur seals, elephant seals, whales, Spread of exploitation, subantarctic to antarctic and more. cherry season streaming altadefinizioneWebThe krill surplus hypothesis in Antarctica is based on the premise that historic depletion of krill-eating whales and seals in the 18-20th centuries provided a surplus of krill in the southern ocean that benefited penguins. Previous study of δ13C and δ15N stable isotopes in ancient and modern tissues of Adélie Penguin (Pygoscelis adeliae) from dozens of active … cherry picker training bristolWeb19 apr. 2024 · See new Tweets. Conversation cherry pickers guide downloadWeb14 jan. 2010 · Almost a year ago, we discussed briefly the Krill Surplus Hypothesis. In this model, the removal of large baleen whales created a competitive release for Minke whales, Balaenoptera bonaerensis , exponentially increasing their food supply and and allowing their population to boom. cherry river elementary