January 30 2013

12:00 LSB 2320

This seminar is sponsored by Co-Sponsored by: The La Kretz Center for California Conservation Science

Marc Mangel
Department Applied Mathematics and Statistics, University of California, Santa Cruz

Southern Ocean Krill, Krill Predators and Krill Fishery Management in a Changing Climate


The southern ocean krill Euphausia superba is a central to the entire ecosystem: everything in the southern ocean either eats krill directly or something that eats krill. Krill are also remarkably successful with a circumpolar distribution and an enormous biomass. However, climate change in the form of increased UV exposure due to ozone depletion, increased water and air temperatures, increasing acidification and decreases in ice may have profound implications for krill life histories and krill predators. I will explain classical fishery yield models and state dependent life history models, using simple examples to illustrate the concepts. I will show how classical fishery models can be used in novel ways to explore the consequences of warming water and fluctuating sea ice on krill biomass and changing UV on krill survival. I will then show state dependent life history models can be used to to explore how variation in krill abundance and spatial patchiness may affect land-based predators \(penguins\) during the reproductive season. Finally, all of these ideas will tied together in a discussion of the implications for management, especially as movement is made towards small scale management units in the southern ocean.











































































































































































































































































































































































































































































































































































































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