The effects of the San Francisco Bay plume on trace metal and nutrient distributions in the Gulf of the Farallones

Hurst, Matthew P.; Bruland, Kenneth W.

doi:10.1016/j.gca.2007.11.005

Cited by 37 publications

(21 citation statements)

References 53 publications

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“…High turbidity and elevated nutrient levels were correlated with low salinity in Monterey Bay providing evidence that low salinity in the upper 15-20 m was the result of local and remote runoff and river outflow in 1998 (Friederich et al 2002). The concentrations of some trace elements, Ba was not among the elements measured, have been found to be higher in the San Francisco Bay plume than in coastal and upwelled waters (Hurst and Bruland 2008).…”

Section: Discussionmentioning

confidence: 88%

Otolith elemental signatures reflect residency in coastal water masses

et al. 2010

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We examined variability in otolith chemistry of wild caught fish in relation to in situ temperature and salinity within the California Current System. Barium, magnesium, and iron from the most recent growth zone in otoliths differentiated pelagic juvenile shortbelly rockfish (Sebastes jordani) residing in water masses with distinct temperature and salinity properties from central and southern California spanning nearly 500 km of coastline. The 3-element signature also discriminated fish that resided in different water masses that were associated with mesoscale cyclonic eddy circulation in the Santa Barbara Channel. Variability in otolith chemistry reflected the spatial patterns of both horizontal gradients and vertical gradients in water mass properties related to circulation. Although we found that the concentrations of particular elements in otoliths were correlated to ambient temperature or salinity, we suggest that these parameters are more useful as an identifying signature of distinct water masses associated with unique otolith signatures rather than as factors directly affecting otolith chemistry. Other factors varying among the water masses or among the fish populations residing in the water masses may also affect otolith chemistry. We discuss how oceanographic phenomena associated with the 1997-1998 El Niño and the persistent, recirculating eddy in the Channel may have affected coastal ocean conditions and variation in otolith chemistry of fish in the study area.

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Section: Discussionmentioning

confidence: 88%

Otolith elemental signatures reflect residency in coastal water masses

et al. 2010

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“…Offshore and San Francisco Bay water masses have lower salinity and higher temperature (Wing et al 1998, Hill & Wheeler 2002, which is reflected in our results. Waters converging off the Farallones as well as waters over Cordell Bank have increased primary productivity (Hurst & Bruland 2008, Halle & Largier 2011. Therefore, adding mid-water properties im proved the predictive ability of the model likely because they are a better proxy for prey availability than the surface waters alone.…”

Section: Mid-water Habitat Associationsmentioning

confidence: 99%

Where the whales are: using habitat modeling to support changes in shipping regulations within National Marine Sanctuaries in Central California

Dransfield¹,

Hines²,

McGowan³

et al. 2014

Endang. Species. Res.

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Understanding habitat preferences for endangered species is a high priority for management strategies to ensure minimum conflict between human uses and wildlife conservation. The purpose of this study was to identify oceanographic variables that predict occurrences of humpback whales Megaptera novaeangliae within the Cordell Bank and Gulf of the Farallones National Marine Sanctuaries, California, USA, to assess potential conflict with vessel traffic. We used data collected by Applied California Current Ecosystem Studies (ACCESS) conducted from 2004 to 2011. Using zero-inflated negative binomial regression, we developed predictive models and identified locations highly used by whales to characterize humpback whale habitat. We analyzed whale encounter rates at 3-km bin intervals in relation to bathymetric, surface and midwater hydrographic predictor variables and temporal variables characterizing oceanographic conditions. Our models included variables that accounted for detectability of whales. Two models were compared and contrasted: (1) a surface-only model, using only surface oceanographic variables, and (2) a surface + mid-water model, using both surface and mid-water variables. The surface + mid-water model performed significantly better than the surface-only model, which underestimated the amount of suitable whale habitat in the northern half of our study area. We compared resulting predicted habitat areas with previous and current San Francisco Bay Area shipping lane poly gonal footprints to investigate whether newly accepted changes in routes reduced areal overlap with humpback whale habitat. Although our analyses show that the area occupied by shipping traffic has decreased in areas of high predicted humpback whale habitat use, changes in vessel lane footprints do not account for several important aspects of ship-strike risk, including vessel frequency, speed, size and density patterns within the shipping lanes and variability between lanes.

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“…Considering all data from the two sampling times, dissolved trace metal concentrations in near-shore coastal waters were comparable with other regions of the world (Table 1), for example, coastal areas near the Celtic Sea (Cotté-Krief et al 2002), Pearl River Estuary (Wang et al 2012), eastern Gotland (Pohl et al 2006), Gulf of Farallones (Hurst and Bruland 2008), Baja California (Sañudo-Wilhelmy and Flegal 1996), Hawaii (Bienfang et al 2009), and the Gulf of Thailand (Censi et al 2006), as well as continental shelves (the Gulf of Mexico and East China Sea) receiving large terrestrial inputs (the Mississippi and Changjiang Rivers, respectively) Wen et al 2011). Concentration ranges observed were 27 -289 pM for Cd, 1.32 -66.26 nM for Cu, 2.39 -86.87 nM for Ni, 0.08 -0.44 nM for Pb, and 0.65 -66.79 nM for Zn.…”

Section: Dissolved Metal Concentrationsmentioning

confidence: 66%

“…Small river systems are highly influenced by seasonally variable climatic patterns which can cause extreme hydrological conditions and have a profound influence in these regions (Wen et al 2008;Wang et al 2012). As a consequence, coastal primary productivity can be enhanced during high river flow conditions (Hurst and Bruland 2008;Wang et al 2012). In order to quantify the material fluxes from land to ocean, and to better understand the influence of human activities on coastal environments, studies on the chemical characteristics of coastal waters are needed (Pohl et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Distribution of Trace Metals (Cd, Cu, Ni, Pb, and Zn) in Coastal Waters off the West Coast of Taiwan

Jiann¹,

Wen²,

Wei³

2014

Terr. Atmos. Ocean. Sci.

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Surface water samples were collected along the west coast of Taiwan during two expedition cruises which represent periods of different regional climatic patterns. Information on hydrochemical parameters such as salinity, nutrients, suspended particulate matter (SPM), and Chlorophyll a concentrations were obtained, and dissolved and particulate trace metal (Cd, Cu, Ni, Pb, and Zn) concentrations were determined. Spatial variations were observed and the differences were attributed to (1) influence of varying extents of terrestrial inputs from the mountainous rivers of Taiwan to the coast, and (2) urbanization and industrialization in different parts of the island. Geochemical processes such as desorption (Cd) and adsorption to sinking particles (Pb) also contributed to the variability of trace metal distributions in coastal waters. Results showed temporal variations in chemical characteristics in coastal waters as a consequence of prevailing monsoons. During the wet season when river discharges were higher, the transport of particulate metals was elevated due to increased sediment loads. During the dry season, lower river discharges resulted in a lesser extent of estuarine dilution effect for chemicals of anthropogenic sources, indicated by higher dissolved concentrations present in coastal waters associated with slightly higher salinity.

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The effects of the San Francisco Bay plume on trace metal and nutrient distributions in the Gulf of the Farallones

Cited by 37 publications

References 53 publications

Otolith elemental signatures reflect residency in coastal water masses

Otolith elemental signatures reflect residency in coastal water masses

Where the whales are: using habitat modeling to support changes in shipping regulations within National Marine Sanctuaries in Central California

Spatial and Temporal Distribution of Trace Metals (Cd, Cu, Ni, Pb, and Zn) in Coastal Waters off the West Coast of Taiwan

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