Iron limitation of phytoplankton in an urbanized vs. forested southeastern U.S. salt marsh estuary

Lewitus, Alan J.; Kawaguchi, Tomohiro; DiTullio, Giacomo R.; Keesee, Jennifer D.M.

doi:10.1016/s0022-0981(03)00361-7

Cited by 25 publications

(11 citation statements)

References 70 publications

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“…While the size of the tissue NO 3 -pool increases, the size of the tissue ammonium NH 4 + and FAA pools remain roughly constant, further suggesting that the reduction of NO 3 -to NO 2 -by NR is rate-limiting. There is the possibility that low trace metal concentrations may have existed in the field at the time of collection (Lewitus et al 2004) or in the pre-treatment and treatment seawater, leading to trace metal limitation in Enteromorpha sp. Since NR contains a heme-iron prosthetic group as well as a molybdopterin cofactor (Crawford & Campbell 1990), iron or molybdenum limitation could impact the response of Enteromorpha sp.…”

Section: Discussionmentioning

confidence: 99%

Response of Enteromorpha sp. (Chlorophyceae) to a nitrate pulse: nitrate uptake, inorganic nitrogen storage and nitrate reductase activity

Lartigue¹,

Sherman²

2005

Mar. Ecol. Prog. Ser.

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Section: Discussionmentioning

confidence: 99%

Response of Enteromorpha sp. (Chlorophyceae) to a nitrate pulse: nitrate uptake, inorganic nitrogen storage and nitrate reductase activity

Lartigue¹,

Sherman²

2005

Mar. Ecol. Prog. Ser.

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“…It has been found that primary production in various estuaries can be limited by either N, P, Si, or Fe (Murrell et al 2002, Wu & Chou 2003, Gameiro et al 2004, Lewitus et al 2004. Primary production can also be co-limited by more than 1 nutrient (Arrigo 2005).…”

Section: Nutrient Limitation At Different Sitesmentioning

confidence: 99%

“…There is a long-standing debate over which nutrient limits primary production in the ocean: nitrogen regulation (biological view) or phosphorus regulation (geochemical view) (Tyrrell 1999). More recently iron has been identified as a potential limiting nutrient to primary production in many parts of the ocean, especially in high nutrient low chlorophyll (HNLC) areas (Martin & Fitzwater 1988), and possibly also in estuaries and some coastal areas (Hutchins & Bruland 1998, Zhang 2000, Lewitus et al 2004. Silicon, as an important compositional element in diatoms, was also found to potentially limit new production in the open ocean, coastal waters, and estuaries (Dugdale et al 1995, Boyd et al 1999, de Baar et al 1999, Wu & Chou 2003.…”

Section: Introductionmentioning

confidence: 99%

Macronutrient and iron limitation of phytoplankton growth in Hong Kong coastal waters

Miao¹,

Hutchins²,

Yin³

et al. 2006

Mar. Ecol. Prog. Ser.

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The western side of Hong Kong possesses estuarine characteristics (from the Pearl River estuary) and the eastern side is mainly influenced by the oligotrophic South China Sea, while the southern side has intermediate hydrological characteristics. We investigated the concentrations of dissolved inorganic nutrients and limitations to phytoplankton growth at these 3 locations around Hong Kong. As expected, measurements of dissolved inorganic nitrogen (DIN) and dissolved silicon (DISi) concentrations decreased from the western (DIN: 42.7 to 112 µM; DISi: 24.1 to 81 µM), to the southern and finally the eastern side (< 5 µM for both DIN and DISi). The dissolved inorganic phosphorus (DIP) concentration was relatively constant among all areas (1.1 to 1.7 µM). C:P and N:P ratios in the phytoplankton were much higher than the Redfield ratio at stations on the western and southern sides, and decreased with the addition of P. Therefore, phytoplankton assemblages at these locations were mainly limited by P as a result of high N and Si inputs from the Pearl River relative to P. Our summer bioassay indicated that Fe was not the primary limiting element in the estuarine area. Although P stimulation of phytoplankton growth was also observed on the eastern side, additions of N, P, Si and Fe indicated that all of these nutrients except Fe had a strong effect on growth. C:Si and N:Si ratios on the eastern side were >> 6.6:1 and >>1:1, respectively, but decreased with the addition of Si. Furthermore, 'luxury uptake' of P and Si was observed after replenishment of these nutrients. Thus, it was hypothesized that phytoplankton on the eastern side were limited by several nutrients sequentially in the following order: P > Si > N/Fe. A shift in limitation from one nutrient to another may frequently take place, as concentrations of all these nutrients are low. Furthermore, temporal and spatial variations of nutrient concentration and phytoplankton growth limitation were also observed in the estuary.

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“…Nutrient (Mallin et al 2000a;Valiela and Bowen 2002;Lewitus et al 2004;White et al 2008), fecal coliform (Mallin et al 2000b;DiDonato et al 2009), and phytoplankton changes in water quality (White et al 2004) all have been attributed to watershed development. Differences in tidal creek sediment characteristics (Sanger et al 1999a, b;Van Dolah et al 2008) and benthic faunal communities (Lerberg et al 2000;Bilkovic et al 2006) also have been correlated to landscape-scale change resulting from suburban, urban and industrial alterations of coastal watersheds.…”

Section: Introductionmentioning

confidence: 99%

“…Although less studied, local development of the terrestrial-marine boundary also can affect adjacent marine habitats (Wigand et al 2001;Bertness et al 2002;Pennings et al 2002;Silliman and Bertness 2004;Bertness and Silliman 2008;Gedan et al 2009;Wigand et al 2010). In the rapidly developing Southeastern USA coastal region, both unknown local-and wellstudied landscape-scale changes (e.g., Lerberg et al 2000;Holland et al 2004;Lewitus et al 2004) are likely to have major affects on the terrestrial-marine boundary and adjacent marsh habitats.…”

Section: Introductionmentioning

confidence: 99%

Local-scale characteristics of high-marsh communities next to developed and undeveloped shorelines in an ocean-dominated estuary, Murrells Inlet, SC

et al. 2010

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Anthropogenic alteration of terrestrial shorelines can have pronounced effects on marine environments at the upland-marsh boundary. Possible terrestrial development effects on several physical and biological variables of high-marsh habitats were examined along developed and undeveloped shorelines in an ocean-dominated, southeastern US estuary. Analyses of sediment characteristics suggested development of the upland boundary affected physical conditions within the high-marsh. For example, pore water salinities were greater along undeveloped shorelines during a non-drought period even after rain events. Significant floral and faunal differences also existed between shoreline treatments. Black needle rush stems were significantly taller and marsh periwinkle densities significantly greater, but eastern coffee bean snail densities were significantly reduced along developed shorelines. Benthic infaunal community abundance and composition also were significantly different between shoreline treatments with sand fly larvae, human pest precursors, either only present or present in greater densities along developed shorelines. Sediment respirometry experiments indicated significant differences in heterotrophic and autotrophic processes occurring between shoreline treatments. Greater sediment surface temperatures along developed shorelines provided one possible mechanism driving high-marsh responses to boundary alteration. The history and extent of shoreline development along with a tendency in ocean-dominated southeastern marshes to resist change likely influenced current ecological conditions within our high-marsh study areas. A greater understanding of the driving mechanisms producing localized effects on salt marshes and recognizing regional differences in marsh resistance to change will facilitate predictions of shoreline development consequences and help in proposing effective management strategies for coastal boundaries.

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Iron limitation of phytoplankton in an urbanized vs. forested southeastern U.S. salt marsh estuary

Cited by 25 publications

References 70 publications

Response of Enteromorpha sp. (Chlorophyceae) to a nitrate pulse: nitrate uptake, inorganic nitrogen storage and nitrate reductase activity

Response of Enteromorpha sp. (Chlorophyceae) to a nitrate pulse: nitrate uptake, inorganic nitrogen storage and nitrate reductase activity

Macronutrient and iron limitation of phytoplankton growth in Hong Kong coastal waters

Local-scale characteristics of high-marsh communities next to developed and undeveloped shorelines in an ocean-dominated estuary, Murrells Inlet, SC

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