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Colijn, F.; Hesse, Karl-Jürgen; Ladwig, Norbert; Tillmann, Urban

doi:10.1023/a:1021361206529

Cited by 29 publications

(9 citation statements)

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“…As previously observed [30], light penetration is also affected by light absorption and decreased penetration due to phytoplankton biomass. Another explanation is that the light-harvesting mechanism of phytoplankton cells is complex [7,22]. In the natural environment, where phytoplankton assemblages always consist of multiple species, the effects of light on overall growth of the phytoplankton community may be varied and unpredictable [34,38,39].…”

Section: Discussionmentioning

confidence: 99%

“…Under natural conditions, all resources together influence phytoplankton development. Studies on the relative importance of nutrients and light to phytoplankton development have mostly been conducted in temperate areas [1,[6][7][8]. Such studies in tropical regions are scarce, although the matter is of particular importance in tropical systems, where sufficient light is available throughout the year.…”

Section: Introductionmentioning

confidence: 99%

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Phytoplankton Biomass Dynamics in Tropical Coastal Waters of Jakarta Bay, Indonesia in the Period between 2001 and 2019

Damar

Colijn

Hesse

et al. 2020

JMSE

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A study of nutrients, underwater light dynamics, and their correlation with phytoplankton biomass was conducted in the tropical estuary of Jakarta Bay, Indonesia, in the dry season during the period from 2001 to 2019. This study analyzed the spatial and temporal dynamics of phytoplankton biomass and its correlation with phytoplankton biomass. There was significant increase in nutrient concentration in Jakarta Bay, with annual means of 27.97 µM dissolved inorganic nitrogen (DIN) and 11.31 µM phosphates in 2001, increasing to 88.99 µM DIN and 25.92 µM phosphates in 2019. Increased mean nutrient concentrations were accompanied by increased mean phytoplankton biomass, from 15.81 µg Chl-a L−1 in 2001 to 21.31 µg Chl-a L−1 in 2019. The eutrophication status of Jakarta Bay waters was calculated using the Tropical Index for Marine Systems eutrophication index, which showed increased areas of hyper-eutrophic and eutrophic zones, while the mesotrophic area decreased. The hyper-eutrophic zone dominated the areas around river mouths and the inner part of the bay, while eutrophic status was observed in the middle part of the bay and mesotrophic status was found in the outer part of the bay. The area of hyper-eutrophic water increased 1.5-fold, from 75.1 km2 in 2001 to 114.0 km2 in 2019. Increasing eutrophication of the bay has had negative ecological consequences including algal blooms, hypoxic conditions, and mass mortality of marine biota, and it urgently requires remediation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phytoplankton Biomass Dynamics in Tropical Coastal Waters of Jakarta Bay, Indonesia in the Period between 2001 and 2019

Damar

Colijn

Hesse

et al. 2020

JMSE

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“…The nitrogen decreased shoot density and biomass of the eelgrass and promoted a record increase in the algal biomass (Deegan et al, 2002). Enhanced nutrient concentrations and loading have been observed in several coastal areas of the North Sea, resulting in increased production and changes in the species composition of phytoplankton (Colijn et al, 2002). Garg et al(2002) studied aquatic flora in three lakes of Bhopal (Upper Lake, Lower Lake and Mansarovar Lake) in India and assessed the potential fertility of the lentic water and its aquatic flora.…”

Section: Microbial and Biodiversitymentioning

confidence: 99%

Mechanisms and assessment of water eutrophication

Yang

Xiang

et al. 2008

J. Zhejiang Univ. Sci. B

476

227

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Water eutrophication has become a worldwide environmental problem in recent years, and understanding the mechanisms of water eutrophication will help for prevention and remediation of water eutrophication. In this paper, recent advances in current status and major mechanisms of water eutrophication, assessment and evaluation criteria, and the influencing factors were reviewed. Water eutrophication in lakes, reservoirs, estuaries and rivers is widespread all over the world and the severity is increasing, especially in the developing countries like China. The assessment of water eutrophication has been advanced from simple individual parameters like total phosphorus, total nitrogen, etc., to comprehensive indexes like total nutrient status index. The major influencing factors on water eutrophication include nutrient enrichment, hydrodynamics, environmental factors such as temperature, salinity, carbon dioxide, element balance, etc., and microbial and biodiversity. The occurrence of water eutrophication is actually a complex function of all the possible influencing factors. The mechanisms of algal blooming are not fully understood and need to be further investigated.

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“…The offshore regions of the North Sea have had few published studies on bottom water oxygen concentrations, with most focussing on coastal waters such as the German Bight (Colijn et al, 2002). Earlier studies have shown the potential for low oxygen events in the central North Sea (Postma and Rommets, 1984;Peeters et al, 1995;Boers, 2005;Weston et al, 2008;De Wilde et al, 1984) but seasonal and temporal coverage was limited.…”

Section: Introductionmentioning

confidence: 99%

Detection of low bottom water oxygen concentrations in the North Sea; implications for monitoring and assessment of ecosystem health

et al. 2010

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Abstract. This paper presents new results from high temporal resolution observations over two years (2007 and 2008) from instrumented moorings deployed in the central North Sea, at the Oyster Grounds and on the northern slope of Dogger Bank (North Dogger). The water column was stratified in the summer at both sites, leading to limited exchange of the water in the bottom mixed layer. Data from these moorings revealed the variable nature of summer oxygen depletion at the Oyster Grounds. The combination of in situ and ship-based measurements allowed the physical and biological conditions leading to decreasing dissolved oxygen concentrations in bottom water to be examined. In 2007 and 2008, the concentration of dissolved oxygen in the bottom water at both sites was observed to decrease throughout the summer period after the onset of stratification. Depleted dissolved oxygen concentration (6.5 mg l −1 , 71% saturation) was measured at the North Dogger, a site which is not significantly influenced by anthropogenic nutrient inputs. Lower oxygen saturation (5.2 mg l −1 , 60% saturation) was measured for short durations at the Oyster Grounds. The seasonal increase in bottom water temperature accounted for 55% of the decrease in dissolved oxygen concentration at the Oyster Grounds compared to 10% at North Dogger.Dissolved oxygen concentration in bottom water at the Oyster Grounds was shown to be strongly influenced by short term events including storms and pulses of particulate organic matter input. In contrast, dissolved oxygen concentration in bottom water at the North Dogger reflected longer seaCorrespondence to: N. Greenwood (naomi.greenwood@cefas.co.uk) sonal processes such as a gradual temperature increase over the summer and a more steady supply of particulate organic matter to the bottom mixed layer. The differences between the study sites shows the need for an improved understanding of the mechanisms driving these processes if the use of oxygen in marine management and ensuring ecosystem health is to be meaningful and successful in the future. These high frequency observations provide greater understanding of the nature of the depletion in bottom oxygen concentration in the North Sea.

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Cited by 29 publications

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Phytoplankton Biomass Dynamics in Tropical Coastal Waters of Jakarta Bay, Indonesia in the Period between 2001 and 2019

Phytoplankton Biomass Dynamics in Tropical Coastal Waters of Jakarta Bay, Indonesia in the Period between 2001 and 2019

Mechanisms and assessment of water eutrophication

Detection of low bottom water oxygen concentrations in the North Sea; implications for monitoring and assessment of ecosystem health

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