Killer whales, whaling, and sequential megafaunal collapse in the north pacific: a comparative analysis of the dynamics of marine mammals in alaska and british columbia following commercial whaling
TL;DR: The hypothesis that commercial whaling caused a sequential megafaunal collapse in the North Pacific Ocean by forcing killer whales to eat progressively smaller species of marine mammals is not supported by what is known about the biology of large whales, the ecology of killer whales, and the patterns of ecosystem change that took place in Alaska, British Columbia, and elsewhere in the world following whaling.
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Abstract: The hypothesis that commercial whaling caused a sequential megafaunal collapse in the North Pacific Ocean by forcing killer whales to eat progressively smaller species of marine mammals is not supported by what is known about the biology of large whales, the ecology of killer whales, and the patterns of ecosystem change that took place in Alaska, British Columbia, and elsewhere in the world following whaling. A comparative analysis shows that populations of seals, sea lions, and sea otters increased in British Columbia following commercial whaling, unlike the declines noted in the Gulf of Alaska and Aleutian Islands. The declines of seals and sea lions that began in western Alaska around 1977 were mirrored by increases in numbers of these species in British Columbia. A more likely explanation is that the seal and sea lion declines and other ecosystem changes in Alaska stem from a major oceanic regime shift that occurred in 1977. Killer whales are unquestionably a significant predator of seals, sea lions, and sea otters—but not because of commercial whaling.
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The sequential megafaunal collapse hypothesis: Testing with existing data
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References
A Pacific interdecadal climate oscillation with impacts on salmon production
TL;DR: In this article, the authors identify a robust, recurring pattern of ocean-atmosphere climate variability centered over the midlatitude North Pacific basin over the past century, the amplitude of this climate pattern has varied irregularly at interannual-to-interdecadal timescales.
Empirical evidence for North Pacific regime shifts in 1977 and 1989
Steven R. Hare,Nathan J. Mantua +1 more
TL;DR: In this paper, the authors used 100 environmental time series, 31 climatic and 69 biological, to determine if there is evidence for common regime signals in the 1965-1997 period of record.
1.6K
Killer Whale Predation on Sea Otters Linking Oceanic and Nearshore Ecosystems
TL;DR: Elevated sea urchin density and the consequent deforestation of kelp beds in the nearshore community demonstrate that the otter's keystone role has been reduced or eliminated in the offshore oceanic ecosystem.
Bottom-up ecosystem trophic dynamics determine fish production in the Northeast Pacific.
TL;DR: Zooplankton data for coastal British Columbia confirm strong bottom-up trophic linkages between phytoplankon, zooplANKton, and resident fish, extending to regional areas as small as 10,000 square kilometers.
711
Decadal-scale climate variability in the tropical and North Pacific during the 1970s and 1980s: observations and model results
TL;DR: In this article, a variety of observed data and model results are presented to describe the climate shift, and to understand some of the links within the coupled climate system that produced it.
688