Persistent ?upwelling shadows? and their influence on zooplankton distributions

Graham, William M.; Field, J. G.; Potts, D. C.

doi:10.1007/bf00357253

Cited by 107 publications

(99 citation statements)

References 21 publications

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“…The presence of high numbers of P. multiseries near the Point Año Nuevo upwelling area during the mid-June cruise suggests that this may be a bloom initiation site with strong influences on Monterey Bay. Previous research has indicated that upwelled water from Point Año Nuevo is advected to the southeast into Monterey Bay past Santa Cruz (Graham et al 1992). Satellite imagery of SST, especially on 21 May (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…Since there is no significant upwelling source within Monterey Bay (Graham et al 1992), upwelled water originating near Point Año Nuevo, north of Monterey Bay, was likely advected southward into the bay (Rosenfeld et al 1994;Tracy 1990). The presence of high numbers of P. multiseries near the Point Año Nuevo upwelling area during the mid-June cruise suggests that this may be a bloom initiation site with strong influences on Monterey Bay.…”

Section: Discussionmentioning

confidence: 99%

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Domoic acid production near California coastal upwelling zones, June 1998

Trainer

Adams

Bill

et al. 2000

Limnology & Oceanography

179

149

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Sea lion mortalities in central California during May and June 1998 were traced to their ingestion of sardines and anchovies that had accumulated the neurotoxin domoic acid. The detection of toxin in urine, feces, and stomach contents of several sea lions represents the first proven occurrence of domoic acid transfer through the food chain to a marine mammal. The pennate diatoms, Pseudo-nitzschia multiseries and P. australis, were the dominant, toxinproducing phytoplankton constituting algal blooms near Monterey Bay, Half Moon Bay, and Oceano Dunes, areas where sea lions with neurological symptoms stranded. Toxic Pseudo-nitzschia were also found near Morro Bay, Point Conception, Point Arguello, and Santa Barbara, demonstrating that these species were widespread along the central California coast in June 1998. Measurements of domoic acid during three cruises in early June showed the highest cellular toxin levels in P. multiseries near Point Año Nuevo at 6 pg cell Ϫ1 and in P. australis from Morro Bay at 78 pg cell Ϫ1 . Maximum cellular domoic acid levels were observed within 20 km of the coast between 0 and 5 m depth, although toxin was also measured to depths of 40 m. Hydrographic data indicated that the highest toxin levels and greatest numbers of toxic cells were positioned in water masses associated with upwelling zones near coastal headlands. Nutrient levels at these sites were less than those typically measured during periods of active upwelling, due to the 1998 El Niño event. The flow of cells and/or nutrients from coastal headlands into embayments where cells can multiply in a stratified environment is a possible mechanism of bloom development along the central California coast. This coupling of toxic Pseudo-nitzschia growth near upwelling zones with physical processes involved in cell transport will be understood only when long-term measurements are made at several key coastal locations, aiding in our capability to predict domoic-acid producing algal blooms.In May and June 1998, at least 70 California sea lions (Zalophus californianus) and one northern fur seal (Callorhinus ursinus) were found stranded along the central California coast. This stranding event occurred between 15 May 1 Corresponding author (Vera.L.Trainer@noaa.gov). AcknowledgmentsWe thank the captain and the crew of the RV Ballena, RV Shana Rae, and PB Bluefin for their help during these cruises, at times under strenuous conditions. We acknowledge the following people for their help in providing useful information that directed the locations of the cruises:

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Domoic acid production near California coastal upwelling zones, June 1998

Trainer

Adams

Bill

et al. 2000

Limnology & Oceanography

179

149

View full text Add to dashboard Cite

show abstract

“…Larvae swim or migrate vertically to help regulate their retention or dispersal, either continuously or through diel or ontogenetic vertical migrations (Bradbury and Snelgrove, 2001;Epifanio and Cohen, 2016;Epifanio and Garvine, 2001;Morgan, in press;Queiroga and Blanton, 2005). Larvae can swim vertically to find favorable horizontal currents (Paris and Cowen, 2004), or swim against vertical velocities to maintain their depth, often resulting in aggregations at fronts (Bjorkstedt et al, 2002;Franks, 1992;Graham et al, 1992;Ryan et al, 2014;Shanks et al, 2000;Shanks et al, 2003a) or the coast (Genin et al, 2005;Shanks and Brink, 2005). Modeling studies show relatively small changes in depth Fig.…”

Section: Introductionmentioning

confidence: 99%

Shoreward swimming boosts modeled nearshore larval supply and pelagic connectivity in a coastal upwelling region

Drake

Edwards

Morgan

et al. 2018

Journal of Marine Systems

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“…The west coast of North America is an eastern boundary ecosystem where spatial and temporal variation in larval recruitment can be influenced by the dynamics of wind-driven coastal upwelling (Parrish et al, 1981;Mooers and Robinson, 1984;Norton, 1987;Graham et al, 1992;Wing et al, 1995b;Connolly et al, 2001). Equatorward wind stress displaces coastal surface waters offshore via Ekman transport, which are replaced by colder, nutrient rich, subsurface waters (Huyer, 1983).…”

Section: Introductionmentioning

confidence: 99%

Recruitment of coastal fishes and oceanographic variability in central California

Wilson

Broitman

Caselle

et al. 2008

Estuarine, Coastal and Shelf Science

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Recruitment of pelagic larval fishes to the nearshore environment is dependent on a suite of biological and physical processes operating at many spatial and temporal scales. Nearshore circulation processes associated with coastal upwelling are widely upheld as major determinants of year class strength for many rockfishes (Sebastes spp.), but the mechanism by which these processes drive recruitment is largely unknown. We used Standard Monitoring Units for the Recruitment of Fishes (SMURFs) to monitor recruitment of two rockfish complexes (Sebastes spp.) and cabezon (Scorpaenichthys marmoratus) from March to September of 2004 and 2005 at 3 sites along the central California coast. We examined the relationship between recruitment of these fishes and measurements of oceanographic variability associated with upwelling dynamics, including in situ water temperature, AVHRR sea surface tempera ture, the Bakun upwelling index, and an index of alongshore surface water transport. We found that rockfish comprising the KCGB complex (Sebastes atrovirens, Sebastes caurinus, Sebastes carnatus, Sebastes chrysomelas) recruit during early summer, while fishes of the BYO complex (Sebastes melanops, Sebastes flavidus, Sebastes serranoides), as well as cabezon recruit during late summer. Our results provide limited support for an association between the arrival of juvenile pelagic rockfish and cabezon to the nearshore environment and physical processes related to upwelling and relaxation. Beyond the limitations of our bimonthly sampling scheme, the lack of a clear pattern may be related to the near absence of upwellingrelaxation cycles along this stretch of coast during these two study periods. Moreover, the settlement and recruitment of nearshore fishes may be closely tied to processes occurring earlier in the larval stage.

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Persistent ?upwelling shadows? and their influence on zooplankton distributions

Cited by 107 publications

References 21 publications

Domoic acid production near California coastal upwelling zones, June 1998

Domoic acid production near California coastal upwelling zones, June 1998

Shoreward swimming boosts modeled nearshore larval supply and pelagic connectivity in a coastal upwelling region

Recruitment of coastal fishes and oceanographic variability in central California

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