Distribution of Pacific hake in a variable environment Michael J. - - PowerPoint PPT Presentation

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Distribution of Pacific hake in a variable environment Michael J. - - PowerPoint PPT Presentation

Sep 26, 2023 155 likes •411 views

Distribution of Pacific hake in a variable environment Michael J. Malick 1,2 , Mary Hunsicker 1 , Melissa Haltuch 1 , Sandy Parker-Stetter 1 , Isaac Kaplan 1 , Aaron Berger 1 , Kristin Marshall 1 , Samantha Siedlecki 3 , Nicholas Bond 3 , Albert

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SLIDE 1

Distribution of Pacific hake in a variable environment

Michael J. Malick1,2, Mary Hunsicker1,

Melissa Haltuch1, Sandy Parker-Stetter1, Isaac Kaplan1, Aaron Berger1, Kristin Marshall1, Samantha Siedlecki3, Nicholas Bond3, Albert Hermann3, Emily Norton3, and Jan Newton3

1 2 3

February 2019

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SLIDE 2

Variability in summer spatial distribution

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MSE

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SLIDE 3

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External drivers Internal drivers

Population size Age structure Prey availability Ocean currents Temperature

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SLIDE 4

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Does variability in ocean environmental conditions explain across-year changes in Pacific hake biomass distribution?

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SLIDE 5

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Does variability in ocean environmental conditions explain across-year changes in Pacific hake biomass distribution?

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SLIDE 6

Hake biomass data

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1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

54.8 36.6

  • Acoustic survey
  • 12 years
  • 36.6—54.8°N

Hake survey transects

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SLIDE 7

Temperature at 100 m

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2007

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SLIDE 8

Temperature at 100 m

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Warmer than average Cooler than average

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SLIDE 9

Temperature at 100 m

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Warmer than average Cooler than average

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SLIDE 10

Temperature at 100 m

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Warmer than average Cooler than average

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SLIDE 11

How is temperature at 100 m related to hake biomass distribution?

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SLIDE 12

Spatially variable temperature effects

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  • Red = positive correlation

between temperature at 100 m and hake biomass

  • Blue = negative correlation

between temperature at 100 m and hake biomass

  • Black dots = locations with a

statistically significant temperature effect

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SLIDE 13

Spatially variable temperature effects

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SLIDE 14

Spatially variable temperature effects

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SLIDE 15

Spatially variable temperature effects

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When hake are found north

  • f 50°N, there tends to be

more of them than average in warmer years When hake are found off WA and S. Van. Is., there tends to be less of them than average in warmer years

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SLIDE 16

Biomass distribution by age-group

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SLIDE 17

Is the effect of temperature at 100 m the same across age- groups?

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SLIDE 18

Age-specific temperature effects

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SLIDE 19

Age-specific temperature effects

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No effect

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SLIDE 20

Age-specific temperature effects

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No effect

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SLIDE 21

How can knowledge about

  • cean environmental effects on

hake biomass distribution be used?

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SLIDE 22

Seasonal forecasting

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Decision lead time 1—10 days 1—6 months decades—centuries Weather forecasting Seasonal forecasting Climate projections

Hobday et al. (2016) Fisheries Oceanography

Forecast skill Lead time

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SLIDE 23

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Spatially variable temperature effects Seasonal forecasts of spatial distribution

Decision lead time 1—6 months Seasonal forecasting

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SLIDE 24

Acknowledgements

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Advisors

Sandy Parker-Stetter Isaac Kaplan Aaron Berger Kristin Marshall Samantha Siedlecki Nicholas Bond Albert Hermann Emily Norton Jan Newton NOAA acoustic survey team

Collaborators

Mary Hunsicker Melissa Haltuch