Progress in Oceanography 77 (2008) 233–240
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Progress in Oceanography 77 (2008) 233–240. D.E. Hay, K.A. Rose, J. Schweigert , B.A. Megrey. GEOGRAPHIC VARIATION IN NORTH PACIFIC HERRING POPULATIONS: PAN-PACIFIC COMPARISONS AND IMPLICATIONS FOR CLIMATE CHANGE IMPACTS. Reporter : 曾建豪. Biological characteristic. Depth : < 200m

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Progress in Oceanography 77 (2008) 233–240

D.E. Hay, K.A. Rose, J. Schweigert , B.A. Megrey

GEOGRAPHIC VARIATION IN NORTH PACIFIC HERRING POPULATIONS: PAN-PACIFICCOMPARISONS AND IMPLICATIONS FOR CLIMATE CHANGE IMPACTS

Reporter : 曾建豪


Biological characteristic
Biological characteristic

  • Depth : < 200m

  • Latitude : 35 °N ~ 70 °N

  • Spawn season : spring

  • Hatch : 2~3 weeks

  • Mature : South  2 years

  • North  3-5 years


Introduction
Introduction

climate

fluctuations

fundamental

properties

  • size-at-age

  • spawning time

  • duration of the spawning period

  • recruitment

  • population diversity

geographic variation


Methods and materials size at age and fecundity data
Methods and materials-Size-at-age and fecundity data

Sources:1.Wakefield herringsymposium in 2000

2.PICES/GLOBECsymposium

  • Asymptotic weight

  • Length at age

  • Fecundity data

  • Recruitment data

  • population diversity


Asymptotic weight
Asymptotic weight

mean age-specific weight (g)

age-specific

increments (ASI) of weight (g)

linear regression


Length at age
Length at age

Age 5, 11populations

Age 2-14, 7populations



Data

western Pacific

eastern Pacific


Fecundity data
Fecundity data

fecundity (eggs/g)=

dividing the total egg counts (eggs)

whole body weight of spawning females (g)


Fecundity data1
Fecundity data

Gulf of Alaska

British Columbia

California


Recruitment data
Recruitment data

British

Columbia, Alaska, Bering Sea

coefficient of variation of annual recruitment (CVR = mean/SD)


CVR

Alaska, age 5

British Columbia, age 5


CVR

Bering Sea, age 4


Herring population diversity
Herring population diversity

complexity of the coastline

Arcview Spatial Analysis

distinct populations

populations per unit of coastline (1000km)


Data analyses
Data analyses

Latitude (length)

East-West (weight)

Mann Whitney test

ANOVA


Results geographic variation asymptotic weight
Results Geographic variation- Asymptotic weight

eastern Pacific

western Pacific

Mann-Whitney test


Length at age1
Length at age

southern

northern

ANOVA


Length at age2
Length at age

western Pacific

eastern Pacific


Population diversity
Population diversity

population diversity

northern regions

< 0.4 populations/1000km

> 4 populations/1000km

California

Bering Sea

Washington State and British Columbia

California


Area specific recruitment
Area-specific recruitment

highest CVRs , greatest range

of variability

CVR = -15.7 + 0.332 latitude


Discussion increase in size with latitude
Discussion-Increase in size with latitude

  • individuals smaller

  • lower longevity

  • higher relative fecundity

150 eggs/g , Gulf of Alaska

200 eggs/g , British Columbia

220 eggs/g , California


East west differences in growth and asymptotic weight
East–West differences in growth and asymptotic weight

eastern Pacific

western Pacific

  • gene

  • nutrients

  • continental

  • shelf area


Population diversity1
Population diversity

Yellow Sea

Sea of Okhotsk


Recruitment variation versus spawning duration
Recruitment variation versus spawning duration

late , short

early , long

  • zooplankton abundance


Recruitment variation versus spawning duration1
Recruitment variation versus spawning duration

high frequency of strong

year classes

war period (1939–1945)


Climate change impacts
Climate change impacts

sardine (Sardinops sagax), anchovy (Engraulis mordax)

smaller, non-migratory


Climate change impacts1
Climate change impacts

San Diego

Santa Barbara



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