Species-specific differences in phytoplankton responses to N and P enrichments and the N:P ratio in the Archipelago Sea, northern Baltic Sea

Lagus, Annika; Suomela, Jukka‐Pekka; Weithoff, Guntram; Heikkila, K.; Helminen, Harri; Sipura, Jaana

doi:10.1093/plankt/fbh070

Cited by 119 publications

(80 citation statements)

References 103 publications

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“…is dominant when nutrient concentrations are low and N:P ratios are high (Lagus et al 2004). Although nutrients were present at a high concentration during winter, their concentration during spring was low compared to that of the coastal areas near the study area (Jang et al 2011), particularly for phosphate (mean 0 0.14 mM), and there was also found to be a high N:P ratio (approximately 29) during the mixing periods.…”

Section: Resultsmentioning

confidence: 80%

Nutrient distribution and effects on phytoplankton assemblages in the western Korea/Tsushima Strait

Jang

Shin

Baek

et al. 2013

New Zealand Journal of Marine and Freshwater Research

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In this study, we investigated the relationship between seasonal/annual variation in water masses and nutrients, and the effects of nutrients on phytoplankton assemblages in the western Korea/ Tsushima Strait. We collected water samples at least once per month from March 2006 to January 2008. There was seasonal variation in nutrient concentrations, with higher values in winter than in summer, and there was annual variation in chlorophyll-a concentration and phytoplankton abundance during spring, with values being approximately three and 10 times higher, respectively, in 2007 than in 2006. Phytoplankton abundance was also approximately four times higher in 2007 than in 2006 during the stratification periods. Our findings suggest that when the supply of nutrients to the upper layer is increased as a result of the Tsushima Warm Water Current and the effect of typhoons, they regulate the abundance and composition of phytoplankton assemblages in the Korea/Tsushima Strait, inducing a succession from flagellates to diatoms.

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Section: Resultsmentioning

confidence: 80%

Nutrient distribution and effects on phytoplankton assemblages in the western Korea/Tsushima Strait

Jang

Shin

Baek

et al. 2013

New Zealand Journal of Marine and Freshwater Research

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“…5, 6), it can be found that Si was exhausted in the downstream of the bay at the end of the second bloom period, and DIN was depleted in the upstream of the bay. This may be understood that different phytoplankton taxa have different individual nutrient consumption, to further understand the inner development of the spring bloom and the nutrient limitation, research should focus on the responses of individual taxon to specific nutrient listed above (Elser et al, 1990;Lagus et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Spatial analysis for spring bloom and nutrient limitation in Xiangxi bay of three Gorges Reservoir

Han

et al. 2006

Environ Monit Assess

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The spatial and temporal dynamics of physical variables, inorganic nutrients and phytoplankton chlorophyll a were investigated in Xiangxi Bay from 23 Feb. to 28 Apr. every six days, including one daily sampling site and one bidaily sampling site. The concentrations of nutrient variables showed ranges of 0.02-3.20 mg/L for dissolved silicate (Si); 0.06-2.40 mg/L for DIN (NH 4 N + NO 2 N + NO 3 N); 0.03-0.56 mg/L for PO 4 P and 0.22-193.37 μg/L for chlorophyll a, respectively. The concentration of chlorophyll a and inorganic nutrients were interpolated using GIS techniques. The results indicated that the spring bloom was occurred twice in space during the whole monitoring period (The first one: 26 Feb.-23 Mar.; the second one: 23 Mar.-28 Apr.). The concentration of DIN was always high in the mouth of Xiangxi Bay, and PO 4 P was high in the upstream of Xiangxi Bay during the whole bloom period. Si seems no obvious difference in space in the beginning of the spring bloom, but showed high heterogeneity in space and time with the development of spring bloom. By comparing the interpolated maps of chlorophyll a and inorganic variables, obvious consumptions of Si and DIN were found when the bloom status was serious. However, no obvious depletion of PO 4 P was found. Spatial regression analysis could explained most variation of Chl-a except at the begin of the first and second bloom. The result indicated that Si was the factor limiting Chl-a in space before achieved the max area of hypertrophic in the first and second bloom period. When Si was obviously exhausted, DIN became the factor limiting the Chl-a in space.Daily and bidaily monitoring of Site A and B, representing for high DIN: PO 4 P ratio and low DIN:PO 4 P ratio, indicated that the concentration of Si was decreased with times at both site A and B, and the dramatically drop of DIN was found in the end monitoring at site B. Multiple stepwise regression analysis indicated that Si was the most important factor affect the development of spring bloom both at site A and B in time series.

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“…Taken together, this suggests that the frequency of DIN-limitation events for diatoms increased throughout this record. Diatoms generally become limited by resource availability before smaller cells (Sunda & Hardison 2007) and typically decline in response to declining DIN:DIP ratios, while other taxa, particularly dinoflagellates, may have competitive advantage under DIP-replete conditions (Lagus et al 2004). DIN-limitation has also been shown to cause decreases in cellular organic N content (Harrison et al 1977) and diminished chl a content in many species, including diatoms and dinoflagellates (Harrison et al 1977, Henriksen et al 2002.…”

Section: Trends In Lis Over 15 Yrmentioning

confidence: 99%

Phytoplankton assemblage changes during decadal decreases in nitrogen loadings to the urbanized Long Island Sound estuary, USA

Suter¹,

Lwiza²,

Rose³

et al. 2014

Mar. Ecol. Prog. Ser.

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Despite reductions in nitrogen loadings from wastewater treatment plants (WWTPs) discharging into Long Island Sound (LIS) over the last 15 yr, eutrophication and hypoxia remain a severe problem. Here we used time series of hydrography, meteorology, nutrients, and phytoplankton pigments to explore the relationships between planktonic biomass, nutrient stocks, and physical regimes in LIS. With the exception of the most eutrophied station in the west, dissolved inorganic nitrogen (DIN) decreased between 1995 and 2009, likely resulting from WWTP upgrades. However, total dissolved nitrogen increased during this period, primarily driven by rising organic nitrogen pools. Simultaneous increases in inorganic phosphorus, silicate, and chlorophyll a (chl a) were also observed. Starting in 2002, pigment-based phytoplankton community composition revealed systematic declines in diatom abundances coincident with increases in dinoflagellates and other flagellated phytoplankton groups. Despite this, bottom water dissolved oxygen concentrations did not improve. The apparent paradox between increasing DIN limitation and escalating chl a concentrations in LIS suggests a shifting nutrient stoichiometry and an altered phytoplankton community in which phytoflagellates have increased in abundance relative to diatoms. Despite these changes, diatoms remained the most abundant algal group by the end of the study. In addition, a shift in chl a stocks in the year 2000 coincided with decreases in temperature, increases in salinity, and the proliferation of several algal groups. These results reveal the complex nature of eutrophied estuaries and indicate that policies targeting only inorganic nitrogen loadings may be insufficient to mitigate eutrophication in systems such as LIS.

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Species-specific differences in phytoplankton responses to N and P enrichments and the N:P ratio in the Archipelago Sea, northern Baltic Sea

Cited by 119 publications

References 103 publications

Nutrient distribution and effects on phytoplankton assemblages in the western Korea/Tsushima Strait

Nutrient distribution and effects on phytoplankton assemblages in the western Korea/Tsushima Strait

Spatial analysis for spring bloom and nutrient limitation in Xiangxi bay of three Gorges Reservoir

Phytoplankton assemblage changes during decadal decreases in nitrogen loadings to the urbanized Long Island Sound estuary, USA

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