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Published byErica Hodge Modified over 8 years ago
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Coastal Upwelling
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What comes up… Equatorward winds drive nearshore upwelling Reversals of these winds have important effects -> downwelling Has implications for recruitment of near- shore fishes & invertebrates
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UPWELLING Cooling inshore Strong geostrophic current DOWNWELLING Warming inshore Weak (or reversed) current
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Coastal Dynamics Experiment
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Many Organisms Have an Obligate Larval Stage
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A Typical Life Cycle Larvae are released to develop in plankton They disperse in the currents A select few settle on suitable habitat Even fewer recruit to adults The cycle repeats (if they ’ re lucky) KEY ELEMENT => Larval Transport
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Who are we talking about?? Species with limited adult home ranges – sessile adults Rockfish, kelp bass, urchin, … Not tuna, sardine, whales,...
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Kinlan & Gaines [2003; Ecology] Dispersal Scales for Marine Organisms
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Dispersal & Time in Plankton Siegel et al. [2003; Marine Ecology Progress Series 260: 83-96] Pelagic Larval Duration (days) Genetic Dispersal Scale (km) The longer the development time, the further the mean dispersal
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Winds and Larval Transport
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The “ Larval Pool ” Hypothesis Distance -> Well-Mixed Larval Pool Settlement Sites Cross-Shelf Transport
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Winds and Larval Transport
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Up/Downwelling & Settlement Deeper Surface Where are the larvae???
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Coastal Downwelling Tightly linked to synoptic wind patterns Storm events driving day to week variability in thermocline depth Superimposed on seasonal pattern Which is superimposed on climate cycles
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Coliform Bacteria & Up/Downwelling
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Downwelling in CA Current Downwelling brings surface water parcels to shore Important for recruitment of intertidal and subtidal organisms Also has role in pollutant dispersion
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