K. Aydin

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Executive Summary Summary of Major Changes Relative to the November 2005 SAFE report, the following substantive changes have been made in the assessment of Atka mackerel. Changes in the Input Data 1. Catch data were updated and catch assumed for projections were set equal to ABC, whereas projections in last year's assessment used constrained TAC levels(More)
uses the NOAA Technical Memorandum series to issue informal scientific and technical publications when complete formal review and editorial processing are not appropriate or feasible. Documents within this series reflect sound professional work and may be referenced in the formal scientific and technical literature. 2002. A comparison of the eastern and(More)
We used a model of the pelagic ecosystem in the eastern tropical Pacific Ocean to explore how climate variation at El Niño – Southern Oscillation (ENSO) scales might affect animals at middle and upper trophic levels. We developed two physical-forcing scenarios: (1) physical effects on phytoplankton biomass and (2) simultaneous physical effects on(More)
Executive Summary This chapter covers the Eastern Bering Sea (EBS) region—the Aleutian Islands region (Chapter 1A) and the Bogoslof Island area (Chapter 1B) are presented separately. Summary of major changes Changes in the input data The primary changes include: • The 2012 NMFS summer bottom-trawl survey (BTS) abundance at age estimates are included. • The(More)
The Chukchi Sea is a seasonally ice-covered, marginal Arctic-shelf sea that possesses both large petroleum reserves and abundant biological communities, including migratory mammals and seabirds. We developed a mass balance food web model for the eastern Chukchi Sea to evaluate the trophic structure of this ecosystem and to compare food web properties of the(More)
Executive Summary The focus of this chapter is on the Eastern Bering Sea (EBS) region. The Aleutian Islands region (Chapter 1A) and the Bogoslof Island area (Chapter 1B) are presented as separate sections. Changes in the input data The 2006 NMFS summer bottom-trawl survey (BTS) abundance at age estimates were computed and included for this assessment.(More)
Steller Sea Lions, Pacific cod, and Atka mackerel are part of a complex, interrelated food web in the Aleutian Islands (Fig. 1). The effects of fishing policy changes, therefore, should be evaluated in both single-species and multispecies contexts. In particular, Atka mackerel are a central species in the Aleutian Islands food web, serving as both predator(More)
Three independent modeling methods—a nutrient-phytoplankton–zooplankton (NPZ) model (NEMURO), a food web model (Ecopath/Ecosim), and a bioenergetics model for pink salmon (Oncorhynchus gorbuscha)—were linked to examine the relationship between seasonal zooplankton dynamics and annual food web productive potential for Pacific salmon feeding and growing in(More)
Note: Affiliations are listed for identification purposes only. OVERVIEW There is widespread agreement that the Great Lakes presently are exhibiting symptoms of extreme stress from a combination of sources that include toxic contaminants, invasive species, nutrient loading, shoreline and upland land use changes, and hydrologic modifications. Many of these(More)