An iron limitation mosaic in the California upwelling regime

Hutchins, David A.; DiTullio, Giacomo R.; Zhang, Y.; Bruland, Kenneth W.

doi:10.4319/lo.1998.43.6.1037

Cited by 308 publications

(169 citation statements)

References 0 publications

Supporting

Mentioning

156

Contrasting

Order By: Relevance

“…6). This ability to distinguish degrees of iron limitation is important since many systems, including the region of our study and some eastern boundary current systems such as the California Current, are subject to different levels of iron stress with varying consequences for the ecology and biogeochemistry of the waters (Hutchins et al 1998;Firme et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Iron limitation across chlorophyll gradients in the southern Drake Passage: Phytoplankton responses to iron addition and photosynthetic indicators of iron stress

Hopkinson

Mitchell

Reynolds

et al. 2007

Limnology & Oceanography

117

100

View full text Add to dashboard Cite

Processes influencing phytoplankton bloom development in the southern Drake Passage were studied using shipboard iron-enrichment incubations conducted across a surface chlorophyll gradient near the Antarctic Peninsula, in a region of water mass mixing. Iron incubation assays showed that Antarctic Circumpolar Current (ACC) waters were severely iron limited, while shelf waters with high ambient iron concentrations (1-2 nmol L 21 ) were iron replete, demonstrating that mixing of the two water masses is a plausible mechanism for generation of the high phytoplankton biomass observed downstream of the Antarctic Peninsula. In downstream highchlorophyll mixed waters, phytoplankton growth rates were also iron limited, although responses to iron addition were generally more moderate as compared to ACC waters. Synthesizing results from all experiments, significant correlations were found between the initial measurements of Photosystem II (PSII) parameters (F v : F m , s PSII , and p) and the subsequent responses of these waters to iron addition. These correlations indicate that PSII parameters can be used to assess the degree of iron stress experienced in these waters and likely in other regions where photoinhibition and nitrogen stress are not confounding factors.

show abstract

Section: Resultsmentioning

confidence: 99%

Iron limitation across chlorophyll gradients in the southern Drake Passage: Phytoplankton responses to iron addition and photosynthetic indicators of iron stress

Hopkinson

Mitchell

Reynolds

et al. 2007

Limnology & Oceanography

117

100

View full text Add to dashboard Cite

show abstract

“…The speed of biological response to high nutrients and light is taxon-specific and also may be influenced by initial macro-nutrient concentrations (i.e., "shift-up" dynamics 6 described by Dugdale et al 1990) and the presence of micro-nutrients (Hutchins et al 1998). Satellite imagery has provided an unprecedented degree of spatial resolution, with reasonable temporal resolution of upwelling spatial structures (Feldman, et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…Satellite imagery has provided an unprecedented degree of spatial resolution, with reasonable temporal resolution of upwelling spatial structures (Feldman, et al, 1989). In addition to the complexity introduced by heterogeneous physical and biological processes, productivity may also be complicated by patchy iron limitation (Hutchins et al 1998, Bruland et al 2001) with constantly shifting boundaries of iron replete and deplete waters, as well as seasonal depletion of iron in coastal waters (Johnson et al 2001).…”

Section: Introductionmentioning

confidence: 99%

WEST: A northern California study of the role of wind-driven transport in the productivity of coastal plankton communities

Largier

Lawrence

Roughan

et al. 2006

Deep Sea Research Part II: Topical Studies in Oceanography

104

View full text Add to dashboard Cite

The "Wind Events and Shelf Transport" (WEST) program was an interdisciplinary study of coastal upwelling off northern California in 2000 was comprised of modeling and field observations. The primary goal of WEST was to better describe and understand the competing influences of wind forcing on planktonic productivity in coastal waters. While increased upwelling favorable winds lead to increased nutrient supply, they also result in reduced light exposure due to deeper surface mixed layers and increased advective loss of plankton from coastal waters. The key to understanding high levels of productivity, amidst these competing responses to wind forcing, is the temporal and spatial structure of upwelling. Temporal fluctuations and spatial patterns allow strong upwelling that favors nutrient delivery to be juxtaposed with less energetic conditions that favor stratification and plankton blooms.

show abstract

“…However, there is no evidence of this in our data and rank statistics did not improve the correlation among variables. Alternatively, the relative abundance of nitrogen may lead to variance in phytoplankton abundance that is unrelated to upwelling or the water column nutrients that we estimated, and is perhaps more a function of turbulent mixing (Smetacek and Passow 1990), other micronutrients such as iron (Coale et al 1996;Hutchins et al 1998), or zooplankton grazing (Landry et al 2000). A lack of correspondence between Chl a and nitrate and phosphorus was also reported by Menge et al (1997) for coastal Oregon and we note that our Chl a estimates were in a range similar to theirs.…”

Section: Discussionmentioning

confidence: 34%

The relative roles of coastal and oceanic processes in determining physical and chemical characteristics of an intensively sampled nearshore system

Pfister

Wootton

Neufeld

2007

Limnology & Oceanography

View full text Add to dashboard Cite

We compared the extent to which offshore and remote-sensing measurements of sea surface temperature (SST), upwelling, and chlorophyll a (Chl a) were concordant with in situ measurements of temperature, Chl a, and water nutrients at Tatoosh Island, Washington for the past 8 yr. Offshore SSTs were significantly correlated with water temperatures at Tatoosh, though consistently 2uC to 3uC warmer. Sea-viewing wide field-of-view sensor Chl a estimates were poor predictors of Chl a at Tatoosh Island measured with an anchored fluorometer. Nitrate and phosphorus estimates at Tatoosh Island were positively correlated with an upwelling index and negatively correlated with SST, as would be expected from an upwelling source. In contrast, ammonium and nitrite were uncorrelated with the upwelling index or SST and showed elevated levels immediately adjacent to Tatoosh Island, suggesting strong local effects of marine invertebrates, birds, and mammals on nutrient dynamics and cycling in coastal ecosystems.

show abstract

An iron limitation mosaic in the California upwelling regime

Abstract: Although Fe limitation is well documented in open ocean high-nutrient, low-chlorophyll

Cited by 308 publications

References 0 publications

Iron limitation across chlorophyll gradients in the southern Drake Passage: Phytoplankton responses to iron addition and photosynthetic indicators of iron stress

Iron limitation across chlorophyll gradients in the southern Drake Passage: Phytoplankton responses to iron addition and photosynthetic indicators of iron stress

WEST: A northern California study of the role of wind-driven transport in the productivity of coastal plankton communities

The relative roles of coastal and oceanic processes in determining physical and chemical characteristics of an intensively sampled nearshore system

Contact Info

Product

Resources

About