Notes on the phytoplankton periodicity of Rostherne Mere, Cheshire, 1967–1977

Reynolds, C. S.

doi:10.1080/00071617800650391

Cited by 22 publications

(5 citation statements)

References 8 publications

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“…Several investigations have associated the nutrients, organic matter and coliforms inputs by bird guano in lagoons [8,9,12,36,74,76]. In addition, the elimination of bottom fauna by guanotrophy (ammonia-poisoning) [10,69] might occur. In this study, we associated a bird effect with the decrease in the pH values, which can affect micro-phytoplankton richness and chl-a production.…”

Section: Discussionmentioning

confidence: 99%

Water quality assessment of a temperate urban lagoon using physico-chemical and biological indicators

et al. 2019

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The aim of this work was to assess the water quality of the urban lagoon located in Parque Unzué (Gualeguaychú, Argentina) using physico-chemical and bacteriological parameters, the composition of micro-phytoplankton assemblages and functional groups (FGs) and to evaluate their annual variability. Twenty-two samplings in three stations were collected between 2015 and 2018, physico-chemical and bacteriological parameters were measured and micro-phytoplankton (20-200 µm) was collected, identified to the lowest taxonomic level and classified in functional groups. Physico-chemical and bacteriological parameters indicated that the lagoon presented high organic pollution and no significant differences (p < 0.05) were observed between sampling stations, but there were differences between the annual periods of sampling. In general, a detriment to water quality can be seen from 2015 to 2018. This was observed in the simplified water quality index (SWQI) values. Micro-phytoplankton assemblages were compounded by 48 genera distributed into Bacillariophyceae (19), Chlorophyceae (12), Cyanophyceae (7), Euglenophyceae (5), Conjugatophyceae (Zygnematophyceae) (3) and Dinophyceae (1). The Chlorophyceae group was the most sensitive to changes in the system and specifically, the genus Chlorella was an early warning indicator. Nineteen FGs were identified, and the majority were characteristic of hypereutrophic, small, turbid and highly enriched lagoons. We conclude that the lagoon located in Parque Unzué showed permanent organic pollution that kept increasing throughout the study time and therefore, that it is possible that the current conditions lead to the collapse of the system.

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Section: Discussionmentioning

confidence: 99%

Water quality assessment of a temperate urban lagoon using physico-chemical and biological indicators

et al. 2019

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“…Recorded chlorophyll maxima generally reach 9 or 10 mg Chl a m –3 , with a recent (1999) exception of just over 11 mg Chl a m –3 (unpublished monitoring records of the CEH/FBA). In Rostherne Mere, peaks of phytoplankton biomass deplete, but never exhaust, the soluble phosphorus pool; in recent years, they have also failed to exhaust the pool of biologically available nitrogen (BAN, effectively, the sum of the DIN forms, plus that nitrogen already incorporated in cells), although this was not always the case (Reynolds, 1978). In contrast, the light function exerts a much lower ceiling on the algal population through most of the year, which is why the sensitivity to stratification is so strong: maxima of 150–200 mg Chl a m –3 have been observed under conditions of summer stratification, when nitrogen or phosphorus limitation was a more likely eventuality (Reynolds & Bellinger, 1992).…”

Section: Outputsmentioning

confidence: 99%

A simple method for approximating the supportive capacities and metabolic constraints in lakes and reservoirs

Reynolds¹,

Maberly²

2002

Freshwater Biology

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1. A method for calculating and comparing the stoichiometric yields of phytoplankton standing crop (as chlorophyll a) is presented. 2. Some worked examples show how the model distinguishes lakes in which the supportive capacity is constrained mainly by the available phosphorus or by the nitrogen supply or by the light availability. Sites are identified where control moves among the constraining factors. 3. An instance of lake management is given where the diagnosis, remedy and the remediation have conformed closely to the model predictions.

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“…The previous studies have addressed the lake's water and nutrient budgeting (see Krivtsov et al 2001bKrivtsov et al , 2002b and references therein), and there is an impressive long term monitoring record of the lake's planktonic community (e.g. Pearsall 1923;Griffiths 1925;Lind 1944;David 1963;Belhcher and Storey 1968;Reynolds and Rogers 1976;Reynolds 1978;Reynolds and Bellinger 1992;Sigee and Holland 1997;Sigee et al 1998Sigee et al , 1999aKrivtsov et al 1999cKrivtsov et al , f, 2000bKrivtsov et al , 2001cKrivtsov et al , 2002 and water chemistry (e.g. Tatersall and Coward 1914;Gorham 1957;Grimshaw and Hudson 1970;NWWA 1983;Tipping 1984;Clay 1992;Carvalho 1993;Krivtsov 1995;Stephen 1997;Krivtsov et al 1999aKrivtsov et al , e, 2003bKrivtsov 2000).…”

Section: Introductionmentioning

confidence: 98%

Importance of biological and abiotic factors for geochemical cycling in a freshwater eutrophic lake

Krivtsov

Sigee

2005

Biogeochemistry

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Here we report the results of a comprehensive biogeochemical monitoring of Rostherne Mere in 1998, including changes in dissolved oxygen, organic carbon and nitrogen, nitrate/nitrite, ammonia, Al, Na, S, K, Mg, Ca, Si, Fe, Mn, orthophosphate, particulate N & P, suspended solids, temperature, pH, chlorophyll-a and zooplankton. The results demonstrated the major influence of primary producers on the overall geochemical cycling of N, P and Si, and suggested that the significance of zooplankton might have been previously underestimated. For major anions and cations, however, the influence of biota on lake water concentrations appeared to be negligible, reflecting the fact that these chemicals were present far in excess of plankton requirements. Thus changes in concentrations of Ca, K, Na, Mg and S were rather limited and must have reflected changes in hydrological and meteorological parameters. K, however, demonstrated a transitional pattern, reflecting some influence of biological uptake. During the stratification period, the slow processes of bacterial decomposition in the hypolimnion gradually released chemicals contained in the materials accumulated in the bottom layer, remarkably increasing the concentrations of dissolved compounds of those elements present in amounts comparable with the pool stored in the sedimenting detritus (e.g. orthophosphate P, ammonia N, Si and DOC). The decomposition also resulted in a drop in the redox potential, followed by partial denitrification and chemical release from the sediments. The hypolimnion of the Mere was confirmed to remain at the stage of Mn release, characterised by accumulation of DOC, orthophosphates, ammonia and initial stages of denitrification. High levels of P released from the sediments during the stratification period suggest that the lake's recovery after sewage diversion might be further delayed.

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Notes on the phytoplankton periodicity of Rostherne Mere, Cheshire, 1967–1977

Cited by 22 publications

References 8 publications

Water quality assessment of a temperate urban lagoon using physico-chemical and biological indicators

Water quality assessment of a temperate urban lagoon using physico-chemical and biological indicators

A simple method for approximating the supportive capacities and metabolic constraints in lakes and reservoirs

Importance of biological and abiotic factors for geochemical cycling in a freshwater eutrophic lake

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