Abundance of Pacific lamprey in the Abundance of Pacific lamprey in - - PowerPoint PPT Presentation

Abundance of Pacific lamprey in the Abundance of Pacific lamprey in the Columbia River and common hosts in the marine environment the marine environment

Josh Murauskas Chelan Public Utilities District Wenatchee, Washington , g

Overview

• Pacific lamprey life history
• Trends in the Columbia River

R l ti hi ith i fi h

• Relationships with marine fishes
• Discussion on ecology

USFWS

Reproductive

Lamprey life cycle

p Migration

p y y

Spawning Parasitic Stage

Adults

Larval Stage Seaward Migration

Juveniles

Transformation

Feeding of adult lampreys g p y

• River lampreys
• Sea lampreys

P ifi l

• Pacific lampreys

NOAA NOAA

Columbia River Basin

• Largest in Pacific NW
• Hydroelectric projects
• Upstream access to Chief

Up C Joseph Dam (rkm 877)

• Significant runs of

Significant runs of anadromous fishes

Trends in the Columbia River

350 400

s

100 120 140 160 am preys 1942 to 1952 1997 to 2007

250 300

f lampreys

20 40 60 80 100 Thousands of la

150 200

• usands of

1 2 3 4 5 6 7 8 9 10 11 Year in in period

• 50

100

Tho Year

Trends in the Columbia River

Our study –examine feeding stage y g g

• Five host species
• Stock assessment data and commercial landings

L t t th C l bi Ri

• Lamprey returns to the Columbia River
• Correlation and regression analyses
• Population cycles

y = 232.82x ‐ 47891 140,000 R² = 0.5656 80,000 100,000 120,000 eturns 40,000 60,000 , Lamprey re 20,000 100 200 300 400 500 600 700 Herring landings y = 1.5095x ‐ 86784 R² = 0.8378 120,000 140,000 g g 60,000 80,000 100,000 mprey returns 20,000 40,000 La ‐ 50,000 75,000 100,000 125,000 150,000 Pacific herring biomass

y = 0 5433x‐33683 140,000 y 0.5433x 33683 R² = 0.5634 80,000 100,000 120,000 returns 20 000 40,000 60,000 Lamprey r 20,000 50,000 100,000 150,000 200,000 250,000 Hake landings

y = 36262x ‐33581 R² = 0.7288 120,000 140,000 60,000 80,000 100,000 mprey returns 20,000 40,000 Lam ‐ 0.00 1.00 2.00 3.00 4.00 5.00 Age 3+ hake biomass

y = 56.306x + 4874.1 R² 0 5581 140,000 R² = 0.5581 80,000 100,000 120,000 eturns 40,000 60,000 , Lamprey re 20,000 200 400 600 800 1,000 1,200 1,400 1,600 Pacific cod landings

y = 13664x ‐ 6452.8 R² = 0.9606 120,000 140,000

Pacific cod landings

60 000 80,000 100,000 prey returns 20,000 40,000 60,000 Lamp ‐ 0.0 2.0 4.0 6.0 8.0 10.0 Pacific cod CPUE

68% d 68% decrease 65% decrease

Species Index p-value r Pacific Hake Biomass Age 3+ (mmt) < 0.001 0.854 Walleye Pollock Biomass (mmt) 0.002 0.857 Pacific Cod CPUE (kg ha-1) < 0.001 0.981 Chinook Salmon Peak counts (adults mi-1) < 0.001 0.882 Pacific Herring Biomass (mt) 0.001 0.915 Pacific Hake* Landings WA + OR (mt) 0.005 0.751 Walleye Pollock** Landings WA + OR (mt) 0.059 0.737 Pacific Cod Landings WA + OR (mt) 0.002 0.747 Chinook Salmon Landings WA + OR (mt) 0.005 0.699 Pacific Herring Landings WA + OR (mt) 0.002 0.752

* Time lag of +2 years, ** time lag of -1 year

Time lags… g

3500 4000 120,000 140,000 s 2000 2500 3000 80,000 100,000 120,000 landings y returns 1000 1500 2000 40,000 60,000 Pollock l Lam prey 500 20,000 L Year Lamprey Pollock

Population cycles (Columbia) p y ( )

1939 1949 1959 1969 1979 1989 1999 2009

Population cycles (North Pacific) p y ( )

1975 1980 1985 1990 1995 2000 2005

Discussion

• Criticisms

l

• Host selectivity

h h ▫ Data, correlation & causation

• Underlying mechanisms

O ? ▫ With growth?

• Oceanic movements

i h h ▫ PDO, PNI?

• Other species

R kfi h l fl fi h ▫ With hosts

• Population cycles

Lif l f l ▫ Rockfish, salmon, flatfishes ▫ Predators? ▫ Life cycle of lampreys

• Importance of marine survival

▫ 10 00% vs 0 02% ▫ 10.00% vs. 0.02%

Population model p

* Concept from Lawson 1993

Acknowledgments g

• A. Orlov (VNIRO) and K. Siwicke (UAF)
• Several helpful reviewers

TINRO C t P ifi H lib t C i i

• TINRO-Center, Pacific Halibut Commission,

NMFS