WSN Annual Meeting 2009 Monterey, California
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WSN Annual Meeting 2009 Monterey, California. Linking Two Data Sets in Order to Establish a Longer Baseline for a Central California Marine Protected Area. Nathan C. Hall 1 , Nakamura, R. 1 , Starr, R. 2 , Wendt, D. E. 1

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Nathan C. Hall 1 , Nakamura, R. 1 , Starr, R. 2 , Wendt, D. E. 1

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Nathan c hall 1 nakamura r 1 starr r 2 wendt d e 1

WSN Annual Meeting 2009 Monterey, California

Linking Two Data Sets in Order to Establish a Longer Baseline for a Central California Marine Protected Area.

Nathan C. Hall1, Nakamura, R.1, Starr, R.2, Wendt, D. E.1

1- Cal Poly Center for Coastal Marine Sciences, 2- UC Grant Extension Program, Moss Landing


Marine protected areas

Marine Protected Areas

  • MPAs as a tool for conservation marine ecosystems

    • MPAs have been shown to have an effect on mean size and abundance of fish species targeted by anglers (e.g., Halpern 2003, Gell and Roberts 2003, Paddack and Estes 2000)

  • Many studies analyze protected vs. non-protected fish populations without providing a baseline

    • Are differences direct results of protection?


Central california mpas

CA Department of Fish and Game

Central California MPAs

  • California Marine Life Protection Act (MLPA)- 1999

    • July 2007- MPAs put in place in central California

    • California Collaborative Fisheries Research Program (CCFRP)


Cal poly commercial passenger fishing vessel observer program

http://www.virgs.com

Cal Poly Commercial Passenger Fishing Vessel Observer Program

  • Observers placed aboard CPFVs beginning in 2003

    • Includes data in existing MPAs


Question

Question

  • Can the Cal Poly CPFV observer data be used to extend the baseline for MLPA monitoring?


Nathan c hall 1 nakamura r 1 starr r 2 wendt d e 1

Cape San Martin

Piedras Blancas

Pt. Estero

Morro Bay

Pt. Buchon

Pt. Sal

Purisima Point

Pt. Conception

OBS Study Area

  • Cal Poly Observer Program

    • Choose a subset of anglers

    • Identify and measure each fish that is caught

    • Record depth, location and time spent fishing for each drift

  • 2003-2008:

    • 417 trips

    • 3,849 locations

    • 57,563 total fish

    • 59 species


California collaborative fisheries research program

Point Buchon

California Collaborative Fisheries Research Program

  • Sampling in 4 MPAs and adjacent reference areas

  • Areas broken into cells

  • Fishingmethods standardized


Linking the datasets

OBS

CCFRP (MLPA)

Gear Type

Varied

Standardized

Angler Effort

Varied

Standardized

Location

Chosen by captain

Randomly chosen

Depth

< 240 ft

< 120 ft.

Linking The Datasets


Linking the datasets1

Point Buchon

Sebastes carnatus

Sebastes mystinus

E. Nakada

N. Yochum

Linking the Datasets

  • Data overlap spatially and temporally

  • Two rockfish species make up over 50% of the catch

Can we use mean length observations from OBS to extend the baseline for CCFRP?

Can we use CPUE observations from OBS to extend the baseline for CCFRP?


Blue rockfish

E. Nakada

Blue Rockfish


Gopher rockfish

N. Yochum

Gopher Rockfish


Mean length

P = 0.002

F = 9.85

P = 0.136

F = 2.22

P = 0.807

F = 0.06

P = 0.575

F = 0.32

Mean Length

  • Can we use mean length observations from OBS to extend the baseline for CCFRP?


Project differences in depth

Project Differences in Depth


Catch per unit effort

REF

MPA

Blue

Rockfish

Gopher

Rockfish

Catch Per Unit Effort

  • Can we use CPUE observations from OBS to extend the baseline for CCFRP?


Conclusions

Conclusions

  • Can the Cal Poly CPFV observer data be used as baseline information for CCFRP MPA monitoring?

    • Mean length for blue and gopher rockfish are generally higher for OBS project

      • Future analyses must have this project effect accounted for

    • CPUE…

  • Extending the baseline of the Pt. Buchon study area will aid in assessing the direct effect of MPAs


Acknowledgements

Acknowledgements

  • Cal Poly: The DEW Lab (Lenora Brewer, Grant Waltz, Dave Rasmussen, Leslie Longabach, Corbin Hodges, Larissa Ormonde, Owen Hackleman, Helen Dickson, Casey Dilg), Erin Nakada, Nick Nesbitt, Steve Reinecke, Andrew Schaffner

  • Moss Landing Marine Laboratories: Noelle Yochum

  • SLOSEA: Melissa Locke, Leslie Rebick

  • Captains and crew of Patriot Sportfishing, Virg’s Landing and Central Coast Sportfishing, our volunteer anglers

  • Funding Sources: The Packard Foundation, Ocean Protection Council, Resources Legacy Fund Foundation


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