Phytoplankton in the Marsdiep at the end of the 20th century; 30 years monitoring biomass, primary production, and Phaeocystis blooms

Cadée, Gerhard C.; Hegeman, J.

doi:10.1016/s1385-1101(02)00161-2

Cited by 195 publications

(159 citation statements)

References 54 publications

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“…Cadée (1986a, b) observed an increase in primary production and a proliferation of the colony forming flagellate Phaeocystis globosa. The increase in primary production continued until the mid 1990s and since then a decreasing trend is observed (Cadée and Hegeman 2002;Philippart et al 2007). Especially, the Phaeocystis blooms were considered as negative effects of eutrophication because of the large amounts of foam that were formed after the collapse of these blooms (Lancelot et al 1987).…”

Section: Introductionmentioning

confidence: 98%

Long-term variability of winter nitrate concentrations in the Northern Wadden Sea driven by freshwater discharge, decreasing riverine loads and denitrification

2007

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The hypothesis of a recent reversal in the eutrophication of the Wadden Sea and the potential of inshore waters in denitrification is explored. Salinity, temperature and nitrate concentrations in the List Tidal Basin (Northern Wadden Sea) have been measured about twice weekly since 1984. Salinity has a clear seasonal cycle with lowest salinities of about 27 in late winter and highest salinities of about 31 in summer. Mean annual deviations from the long-term mean salinity correlate significantly with riverine freshwater discharge. Winter nitrate concentrations are generally high (about 50 lM on average). The major part of the variability is related to salinity (*35%). Temperature had a minor impact (*1%). Superimposed on this, a long-term decrease of about 1 lM per year was found. Together, these processes account for about 45% of the nitrate variability. The long-term decrease of about 2% per year is similar to continental riverine trend in total nitrogen loads. In contrast to the List Tidal Basin, salinity explained more than 90% of nitrate variability in the off-shore German Bight. Salinity (30) normalised winter nitrate data of the German Bight also show a long-term decreasing trend. Most of the List Tidal Basin data are either on or below the nitrate-salinity relation found in the German Bight. This observation suggests that denitrification has a major impact on the winter nitrate concentrations in the Northern Wadden Sea compared to the German Bight. It is hypothesised that a large part of the unexplained variability is related to weather-dependent changes in residence time of tidal water masses in the Wadden Sea and circulation patterns within the German Bight.

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Section: Introductionmentioning

confidence: 98%

Long-term variability of winter nitrate concentrations in the Northern Wadden Sea driven by freshwater discharge, decreasing riverine loads and denitrification

2007

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“…Phytoplankton biomass and chl-a are usually controlled by nutrient loading (Lenhart et al, 1997;Cadee and Hegeman, 2002;Vermaat et al, 2008). In Sishili Bay, high chl-a concentration zones were distributed along the coast and the outfalls coincident with high nutrient concentrations.…”

Section: Ecological Status During Red Tides Periodsmentioning

confidence: 99%

“…Aquaculture and nutrients input can also influence phytoplankton (Cadee and Hegeman, 2002;Philippart et al, 2007); for example, cultured scallops can strongly reduce chl-a concentrations (Dame et al, 1991;Phelps, 1994;Kohata et al, 2003). As one of the most intensive culture areas in China, Sishili Bay is influenced by cultured organisms, such as scallops and kelp Cadee and Hegeman, 2002;Zhou et al, 2002b).…”

Section: Ecological Status During Red Tides Periodsmentioning

confidence: 99%

“…As one of the most intensive culture areas in China, Sishili Bay is influenced by cultured organisms, such as scallops and kelp Cadee and Hegeman, 2002;Zhou et al, 2002b). Cultured scallops can remove up to 45% of the suspended matter from the water column every day, which would benefit the N and P flux (Zhou et al, 2002b(Zhou et al, , 2006.…”

Section: Ecological Status During Red Tides Periodsmentioning

confidence: 99%

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Nutrient and chlorophyll a anomaly in red-tide periods of 2003–2008 in Sishili Bay, China

Hao

Tang

et al. 2011

Chin. J. Ocean. Limnol.

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Sishili Bay is the most important aquiculture and tourism area for the city of Yantai, China; however, red tides occurred frequently and have caused huge economic losses in this bay in recent years. Overall, the results show the P limitation in Sishili Bay, and reveal that red tides were caused by eutrophication from terrestrial inputs and local warm weather, particularly during rainy periods. Therefore, to control red tide, greater efforts should be made to reduce sewage discharges into Sishili Bay, particularly during rainfall seasons.

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“…In these ecosystems, P. globosa bloom formation is predominantly a result of anthropogenic factors, i.e. nutrient inputs via riverine and land run-off routes (Cadée and Hegeman, 2002). Consequently, Phaeocystis spp.…”

Section: Introductionmentioning

confidence: 99%

Effects of elevated CO2 on phytoplankton community biomass and species composition during a spring Phaeocystis spp. bloom in the western English Channel

et al. 2017

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A 21-year time series of phytoplankton community structure was analysed in relation to Phaeocystis spp. to elucidate its contribution to the annual carbon budget at station L4 in the western English Channel (WEC).Between 1993-2014 Phaeocystis spp. contributed $4.6% of the annual phytoplankton carbon and during the March À May spring bloom, the mean Phaeocystis spp. biomass constituted 17% with a maximal contribution of 47% in 2001. Upper maximal weekly values above the time series mean ranged from 63 to 82% of the total phytoplankton carbon ($42-137 mg carbon (C) m À3 ) with significant interannual variability in Phaeocystis spp. Maximal biomass usually occurred by the end of April, although in some cases as early as mid-April (2007) and as late as late May (2013).The effects of elevated pCO 2 on the Phaeocystis spp. spring bloom were investigated during a fifteenday semi-continuous microcosm experiment. The phytoplankton community biomass was estimated at $160 mg C m À3 and was dominated by nanophytoplankton (40%, excluding Phaeocystis spp.), Phaeocystis spp. (30%) and cryptophytes (12%). The smaller fraction of the community biomass comprised picophytoplankton (9%), coccolithophores (3%), Synechococcus (3%), dinoflagellates (1.5%), ciliates (1%) and diatoms (0.5%). Over the experimental period, total biomass increased significantly by 90% to $305 mg C m À3 in the high CO 2 treatment while the ambient pCO 2 control showed no net gains. Phaeocystis spp. exhibited the greatest response to the high CO 2 treatment, increasing by 330%, from $50 mg C m À3 to over 200 mg C m À3 and contributing $70% of the total biomass.Taken together, the results of our microcosm experiment and analysis of the time series suggest that a future high CO 2 scenario may favour dominance of Phaeocystis spp. during the spring bloom. This has significant implications for the formation of hypoxic zones and the alteration of food web structure including inhibitory feeding effects and lowered fecundity in many copepod species.Crown

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Phytoplankton in the Marsdiep at the end of the 20th century; 30 years monitoring biomass, primary production, and Phaeocystis blooms

Cited by 195 publications

References 54 publications

Long-term variability of winter nitrate concentrations in the Northern Wadden Sea driven by freshwater discharge, decreasing riverine loads and denitrification

Long-term variability of winter nitrate concentrations in the Northern Wadden Sea driven by freshwater discharge, decreasing riverine loads and denitrification

Nutrient and chlorophyll a anomaly in red-tide periods of 2003–2008 in Sishili Bay, China

Effects of elevated CO2 on phytoplankton community biomass and species composition during a spring Phaeocystis spp. bloom in the western English Channel

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