California Current & PowerPoint Presentation

California Current & PowerPoint Presentation

2015-12-12 77K 77 0 0


Barnacle larvae transport. Mikaela. Provost. Physical Oceanography 12/2/2010. California Current. Eastern edge of the North. . Pacific Gyre.. Moves south along the western coast of North America bringing cool water from Alaska to Baja California.. ID: 221894

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California Current &

Barnacle larvae transport



Physical Oceanography 12/2/2010


California Current

Eastern edge of the North

Pacific Gyre.

Moves south along the western coast of North America bringing cool water from Alaska to Baja California.


What sustains the CA current?


Westerlie winds drive the California current


Upwelling is characteristic



transport offshore yields strong upwelling along the CA coast, supporting a high level of marine biodiversity


Sea Surface Temperature

- Cool water, an indicator of upwelling.

- Transport can be as much as 300 m



- Strongest upwelling in summer


Currents and barnacle recruitment

Question facing many marine ecologists: Observe large fluctuations in the abundance of barnacle stock populations, and yet the environment seems to be highly productive.

Each data point represents a total of 7 days of settlement of acorn barnacles on six 10 cm x 10 cm plates.


Upwelling Intensity & Population Variability

- Higher recruitment associated with weaker cases of upwelling.

- Intertidal barnacle larvae carried offshore with strong upwelling, lower probability of encountering adult habitat for settlement.


Reasons for variation in barnacle populations:



Alexander and Roughgarden. 1996. Larval Transport and Population Dynamics of Intertidal Barnacles: A Coupled Benthic/Oceanic Model. Ecological Monographs 66: 259-275Farrell etal. 1991. Cross-shelf transport causes recruitment to intertidal populations in central California. Limnological Oceanography 36: 279-288.Shkedy and Roughgarden. 1997. Barnacle recruitment and population dynamics predicted from coastal upwelling. Oikos 80: 487-498.

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