Monster Seminar JAM - Putting it All Together: Building an Ecosystem-based Management Framework
Dr. Jacquelynne R. King, Pacific Biological Station, Fisheries and Oceans Canada
Fisheries scientists and managers are currently faced with what seems to be the insurmountable challenge of managing marine resources within an ecosystem-based framework. We are now faced with providing advice and forecasts on the status of stocks given natural and augmented climate variability impacts, in addition to exploitation impacts. Advice is now required for bycatch species that, unlike targeted species, do not have adequate records of catch statistics or biological information for traditional assessment methods. In addition, stock assessments need to consider the status of a species prey and of its predators, and also consider what the impact of altering a species abundance through harvesting will have on these two trophic levels. Taken together, these challenges may seem overwhelming, but for the most part science and management activities are already available for linking ecosystem assessments to stock assessment advice, we just need to put it all together in a coherent framework, i.e. build an ecosystem-based management framework. The underlying paradigm for ecosystem-based management is that fish populations may be impacted by exploitation, but the fundamental mechanisms for fish population dynamics are changes in ecosystems, including climate-ocean impacts and trophic level interactions. Ecosystem assessments capture and report changes in ecosystem productivity and can include climate indices along with information on lower and higher trophic levels. Marine organisms have evolved life history strategies to cope with variability in their environment. In fish, these life history strategies range from short-lived species (opportunistic strategists) with highly variable stock dynamics which respond immediately to changes in the environment to extremely long-lived species (periodic strategists) whose population dynamics are not highly variable. Strategist groupings could be used to classify species for which there is little information on absolute or relative abundance (e.g. bycatch species) into a conceptual framework of management options. Strategist groupings can also form the basis of developing a decision-based framework for selecting harvest rate scenarios given changes in ecosystem productivity. In this talk, I try to put it all together by providing an example of an ecosystem assessment, with particular reference to climate regime shifts; outlining strategist groupings and classifying their responses to climate and ocean changes; identifying management scenarios for strategists groupings; and outlining a conceptual ecosystem-based framework with examples of the benefits and tradeoffs of regimes-specific harvest rates for a short-lived species and a long-lived species.
University of Washington
Date and Time:
April 27, 2006,
11:00 am - 12:30 pm