The macrophytes in the Loosdrecht Lakes: A story of their decline in the course of eutrophication

Best, Elly P. H.; Vries, Danny de; Reins, A.

doi:10.1080/03680770.1983.11897400

Cited by 18 publications

(15 citation statements)

References 4 publications

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“…Eutrophication of waters will not only lead to algal blooms occurrence, but also to the extinction of submerged plants, as widely reported in other countries [29][30][31][32][33][34]. For example, the area of macrophytes in Lake Kasumigaura, Japan, varies with the total phosphorus concentration (Figure 7).…”

Section: Ecosystem Response To Lake Eutrophicationmentioning

confidence: 96%

Lake eutrophication and its ecosystem response

et al. 2012

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China is a country with many lakes, about one-third of which are freshwater mainly distributed in the middle and lower reaches of the Yangtze River. Currently most of the lakes are mesotrophic or eutrophic. Lake eutrophication has become one of the major ecological and environmental problems faced by lakes in China and can lead to a series of abnormal ecosystem responses, including extinction of submerged plants, frequent occurrence of cyanobacterial blooms, increased microbial biomass and productivity, decreased biodiversity, accelerated cycles, and a change in the efficient use of nutrients. With development of eutrophication, the whole lake ecosystem suffers decreased biodiversity, simplification of biotic community structure, instability of the ecosystem, and ultimately the clear-water, macrophyte-dominated ecosystem gradually shifts to a turbid-water, algae-dominated ecosystem. This ecosystem succession mechanism is speculated to be caused by different nutrient utilization efficiencies of macrophytes and phytoplankton. The ultimate ecosystem succession trend of seriously eutrophic lakes is that a phytoplankton-dominated autotrophic lake shifts to a heterotrophic lake dominated by micro-organisms, protozoans. Today, eutrophication generally refers to trophic state arising from increased nitrogen and phosphorus input, specifically, increased discharge of plant nutrients (mainly nitrogen and phosphorus) from industrialization, agricultural modernization, and urbanization.Nitrogen, phosphorus, and some other elements are essential for plant growth; however, if a water body receives more nitrogen and phosphorus than necessary, the ecosystem can experience changes such as algal blooms; therefore, eutrophication can be considered as a biological or ecological concept. In this sense, using nitrogen, phosphorus, or other environmental factors is not the most appropriate way to evaluate the trophic level of a lake or reservoir; instead, the evaluation should be based on primary productivity of macrophytes and phytoplankton, but these indicators are difficult to assess. Alternatively, nitrogen, phosphorus, transparency, and chlorophyll a are commonly used as indicators for evaluation of eutrophication.OECD proposed the following thresholds of eutrophication in 1982: average total phosphorus concentration >0.035 mg/L; average chlorophyll a concentration >0.008 mg/L; and average transparency <3 m [2]. According to these thresholds, many lakes in China have become eutrophic. An assessment of the trophic status of lakes in the middle and

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Section: Ecosystem Response To Lake Eutrophicationmentioning

confidence: 96%

Lake eutrophication and its ecosystem response

et al. 2012

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“…During the past 30 years phytoplankton biomass has increased, leading to partial disappearance of the submerged macrophytes and charaphytes (Best et al 1984). The seston mass now varies seasonally from 10 to 30 mg liter-I.…”

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confidence: 99%

Phytoplankton growth and phosphate uptake (for P limitation) by natural phytoplankton populations from the Loosdrecht lakes (The Netherlands)1

Riegman¹,

Mur²

1986

Limnology & Oceanography

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Phosphate uptake capacity of natural phytoplankton populations was used as a physiological indicator of P limitation in the Loosdrecht lakes. During a substantial period of the growth season of 1983, P-limited growth was observed in Lake fireukeleveen and Lake Loosdrecht, but P limitation was less severe in the latter. In Lake Breukeleveen the maximum initial phosphate uptake rate (V,,) varied between 0.3 and 5.7 pg P (pg Chl)-' h-l during P-limited growth, whereas in Lake Loosdrecht, V,, varied between 0.3 and 2

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“…The characeans gradually disappeared and were completely absent in 1980, except for a small area in the Loenderveen Lakes (BEST et al, 1984).…”

Section: Eutrophi Cati Onmentioning

confidence: 99%