Reporter : 曾建豪
description
Transcript of Reporter : 曾建豪
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GEOGRAPHIC VARIATION IN NORTH PACIFIC HERRING POPULATIONS: PAN-PACIFIC
COMPARISONS AND IMPLICATIONS FOR CLIMATE CHANGE IMPACTS
Reporter : 曾建豪
D.E. Hay, K.A. Rose, J. Schweigert , B.A. Megrey
Progress in Oceanography 77 (2008) 233–240
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Biological characteristic
•Depth : < 200m•Latitude : 35 °N ~ 70 °N•Spawn season : spring•Hatch : 2~3 weeks•Mature : South 2 years North 3-5 years
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Introduction
fundamentalproperties
geographic variation
•size-at-age•spawning time•duration of the spawning period•recruitment•population diversity
climatefluctuations
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Methods and materials- Size-at-age and fecundity data
Sources: 1. Wakefield herring symposium in 2000 2. PICES/GLOBEC symposium
•Asymptotic weight•Length at age•Fecundity data•Recruitment data•population diversity
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Asymptotic weight
mean age-specific weight (g)
age-specificincrements (ASI)
of weight (g)
linear regression
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Length at age
Age 5, 11populations
Age 2-14, 7populations
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Data
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Data
western Pacific
eastern Pacific
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Fecundity data
fecundity (eggs/g) =
dividing the total egg counts (eggs)
whole body weight of spawning females (g)
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Fecundity data
Gulf of Alaska
British Columbia
California
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Recruitment data
BritishColumbia, Alaska, Bering Sea
coefficient of variation of annual recruitment (CVR =
mean/SD)
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CVR
British Columbia, age 5
Alaska, age 5
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CVR
Bering Sea, age 4
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Herring population diversity
distinct populations
populations per unit of coastline
(1000km)
complexity of the coastline
Arcview Spatial Analysis
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Data analyses
Latitude (length)
East-West (weight)
ANOVA
Mann Whitney test
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Results Geographic variation- Asymptotic weightwestern Pacific eastern Pacific
Mann-Whitney test
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Length at age
ANOVA
northernsouthern
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Length at age
western Pacific
eastern Pacific
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northern regions
< 0.4 populations/1000km
> 4 populations/1000km
population diversity
Population diversity
Washington State and British Columbia
Bering Sea
California
California
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Area-specific recruitment
highest CVRs , greatest rangeof variability
CVR = -15.7 + 0.332 latitude
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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
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East–West differences in growth and asymptotic weight
western Pacific eastern Pacific
•nutrients
•continental shelf area
•gene
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Population diversity
Sea of Okhotsk
Yellow Sea
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Recruitment variation versus spawning duration
early , long
late , short
•zooplankton abundance
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Recruitment variation versus spawning duration
high frequency of strongyear classes
war period (1939–1945)
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Climate change impacts
sardine (Sardinops sagax), anchovy (Engraulis mordax)
smaller, non-migratory
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Climate change impacts
San Diego
Santa Barbara
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Thanks for your attention !