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Changes in the Bering Sea
Changes in the Bering Sea
Levels of fishing mortality used in MSFOR AND SSFOR
Levels of fishing mortality used in MSFOR AND SSFOR
Biomass flow in the system defined for the eastern Bering Sea
Biomass flow in the system defined for the eastern Bering Sea
Input and output data for the MSFOR model
Input and output data for the MSFOR model
Results: total population
Results: total population
Results: yield
Results: yield
Long-term percentage changes of yield
Long-term percentage changes of yield
Long-term percentage changes of total and spawning biomass (Fref vs
Long-term percentage changes of total and spawning biomass (Fref vs
Long-term percentage changes of total and spawning biomass (Fref vs
Long-term percentage changes of total and spawning biomass (Fref vs
Long-term percentage changes of total and spawning biomass (Fref vs F
Long-term percentage changes of total and spawning biomass (Fref vs F
Long-term percentage changes of total and spawning biomass (Fref vs F
Long-term percentage changes of total and spawning biomass (Fref vs F
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Автор: Jesus Jurado-Molina; Patricia Livingston. Чтобы познакомиться с картинкой полного размера, нажмите на её эскиз. Чтобы можно было использовать все картинки для урока английского языка, скачайте бесплатно презентацию «Multispecies perspectives on the Bering Sea Ground Fishery Management Regime.ppt» со всеми картинками в zip-архиве размером 491 КБ.

Multispecies perspectives on the Bering Sea Ground Fishery Management Regime

содержание презентации «Multispecies perspectives on the Bering Sea Ground Fishery Management Regime.ppt»
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1Multispecies perspectives on the 12MSP- Multispecies forecast, SSP - single
Bering Sea Ground Fishery Management species forecast.
Regime. Jes?s Jurado-Molina School of 13Long-term percentage changes of total
Fisheries, University of Washington and spawning biomass (Fref vs FABC).
Patricia Livingston Alaska Fisheries Biomass - total biomass SSB - spawning
Science Center-NMFS. biomass. Proportion of Pacific herring
2Changes in the Bering Sea. population consumed by predators.
3Levels of fishing mortality used in Proportion of pollock total population
MSFOR AND SSFOR. PLK - walleye pollock, consumed by predators.
COD - Pacific cod, GTB - Greenland turbot, 14Long-term percentage changes of total
YFS - yellowfin sole, SOL - rock sole, HER and spawning biomass (Fref vs F = 0).
- Pacific herring. Biomass - total biomass SSB - spawning
4Objective. To apply the single and biomass. Proportion of rock sole
multispecies forecasting models to assess population consumed by predators.
the long-term effects produced by three Proportion of pollock population consumed
harvesting regimes (Fref, FABC and F = 0) by predators.
on yield, total and spawning biomass of 15Conclusions. SSFOR and MSFOR suggest
some species from the Bering Sea. that the implementation of FABC would
5Biomass flow in the system defined for produce small long-term changes in the
the eastern Bering Sea. structure of the eastern Bering Sea
6MSVPA and MSFOR equations. BS - groundfish populations compared to Fref.
suitable prey biomass S - suitability Changes in the F regime can indirectly
coefficient of predator i and prey p R - affect the predation mortality of prey due
annual consumption of the predator i W - to decreases in predator population and
weight at age of prey p M1- residual consumption of prey. The implementation of
mortality M2 - predation mortality. the FABC regime resulted in no significant
7Multispecies forecasting assumptions. change in pollock predation mortality due
M = M1 + M2 Constant annual consumption of to canceling effects of pollock
predators. Other food = constant Constant consumption by arrowtooth flounder and
suitability coefficients (from MSVPA) adult pollock (cannibalism) When FABC was
Constant recruitment Recruitment of age-0 implemented, SSFOR and MSFOR predicted
individuals takes place in the third almost the same trends for the indicators
quarter. analyzed. However, some differences in
8Input and output data for the MSFOR magnitude and direction due to predation
model. interactions were observed for rock sole
9Methods. MSVPA run updated to 1998 and Pacific herring. Multispecies
data to obtain average suitabilities, simulations of no fishing scenarios change
average recruitment values and population our perspective on recovery times for
initial values (1998) for all species. depleted populations.
Three MSFOR runs (Fref, FABC and F = 0) to 16Future tasks. To simulate the system
obtain three equilibrium indicators: with different levels of recruitment
yield, total and spawning biomass Three associated to climate shifts To carry out
Single species runs using the same fishing Monte Carlo simulations for MSFOR and
mortalities and obtaining the same SSFOR incorporating different assumptions
indicators Comparison of the relative on recruitment (Ricker/B&H and
change of the indicators using: stochastic components) To include the
10Results: total population. predation equations in a system of linked
11Results: yield. catch at age models (Multispecies
12Long-term percentage changes of yield. CAGEAN?).
Multispecies perspectives on the Bering Sea Ground Fishery Management Regime.ppt
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Multispecies perspectives on the Bering Sea Ground Fishery Management Regime

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