The seasonal response of diatom communities to variable water quality in some English urban lakes

Guzkowska, M. A. J.; Gasse, Françoise

doi:10.1111/j.1365-2427.1990.tb00269.x

Cited by 8 publications

(5 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Guzkowska and Gasse (1990a, b) identified specific diatom assemblages in urban lakes which corresponded to a particular range of water quality conditions with respect to hardness, conductivity, pH and nutrients. They also showed that storm events can result in large changes of water chemistry and subsequently planktonic diatom assemblages (Guzkowska and Gasse 1990a). More frequent monitoring of diatoms and water chemistry would be required to establish how shortterm events, such as high surface runoff and sewage overflow after storm events, affect the seasonal succession of diatom assemblages at Cardiff Bay.…”

Section: Discussionmentioning

confidence: 97%

“…Major variations in environmental conditions can be expected in a lake such as Cardiff Bay with two relatively large inflows of different character, its heterogeneous shoreline and its varied use. Furthermore, rapid changes in water quality of urban lakes are often a result of unpredictable events, such as polluted urban runoff after storms, construction work and road salting, which can override other factors such as the seasonal changes in water temperature or water chemistry (Mance 1981;Guzkowska and Gasse 1990a;Choe et al 2002). Diatom assemblages can respond quickly to altered conditions after such events, and this might explain the large spatiotemporal variations in assemblage composition in Cardiff Bay.…”

Section: Discussionmentioning

confidence: 98%

See 1 more Smart Citation

Using diatoms as quality indicators for a newly-formed urban lake and its catchment

Jüttner

Chimonides

Ormerod

2009

Environ Monit Assess

View full text Add to dashboard Cite

Periphytic diatoms were studied to evaluate the water quality of a newly created lake, formed by the enclosure of the formerly tidal Cardiff Bay (Wales, UK), and the effects of two inflowing rivers which drain densely populated and industrialised catchments. Seven sites in Cardiff Bay and two locations on the inflowing rivers were monitored for diatoms and water chemistry over 2 years. Water quality was assessed using a revised UK trophic diatom index (TDI) and new methods to determine ecological quality ratios and ecological status classes as required by the EU Water Framework Directive. Diatom assemblages reflected spatiotemporal variations in environmental conditions between the rivers and Cardiff Bay and within the bay. In the bay, diatoms reflected differences in river quality and possibly local pollution in certain areas of the lake. High values of the TDI indicated eutrophic to hypertrophic conditions in both rivers and in the bay and diatoms indicated poor ecological status.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 98%

Using diatoms as quality indicators for a newly-formed urban lake and its catchment

Jüttner

Chimonides

Ormerod

2009

Environ Monit Assess

View full text Add to dashboard Cite

show abstract

“…The statistical methods described are capable of giving more detailed information about the dynamics of diatom response to transient events, such as seasonal trends and reaction to storms. TTie response of sub-assemblages as defined by further sub-division using TAVINSPAN is examined in the subsequent paper (Guzkowska & Gasse, 1990), since the advantage of using diatoms as indicators of water quality can only be fully understood and utilized when this finer detail has been elucidated. conductivity meter using the instrument's automatic temperature compensator.…”

Section: Discussionmentioning

confidence: 99%

Diatoms as indicators of water quality in some English urban lakes

Guzkowska

Gasse

1990

Freshwater Biology

Self Cite

View full text Add to dashboard Cite

1. The paper describes diatom communities from a series of linked urban lakes in relation to water chemistry and uses mullivariate statistical techniques to show how indicator groups can be defined.2. Diatoms are classified into ecological groups using two-way species indicator analysis (TWINSPAN). Each ecological group is assiciated with a specific range of water-quality conditions. The headwater stream environments are differentiated from the lake habitats at level 1. Al level 2 of TWINSPAN, the sampling sites are grouped into five ecological groups. according to their water chemistry and irrespective of the time of year.3. Detrended correspondence analysis (DCA) and principal components analysis (PCA) provide two statistically independent methods of assessing the environmental gradients along which the ecological groups are distributed. The most important physico-chemical parameters are total hardness, specific conductance and pH, followed by phosphates and nitrates.4. Ecological groups I-V correspond to an environmental gradient ranging from the forested headwaters, which are acidic, of low specific conductance, total hardness and nutrient content, through the urban lakes, which are alkaline and of relatively high total hardness, specific conductance and nutrient content.5. Twelve site groups are identified at level 3 of TWINSPAN. each of which corresponds to a narrower range of water-quality conditions within the ecological groupings. A specific diatom assemblage is associated with each site group.6. Benthic diatoms form an intregral part of the diatom assemblages found in the water column and this is identified as a topic for further study.

show abstract

“…3). The species from these groups tend to adapt quickly when changes in the environment occur (Guzkowska & Gasse, 1990).…”

Section: Tablementioning

confidence: 99%

The use of mechanical aeration and its effects on water mass

1999

View full text Add to dashboard Cite

Due to the increasing use of artificial aerators in fish ponds, and to the lack of studies on this subject, this work studied some of the aspects associated with their use. The influence of a diffuser type aerator (AR 120) on the biotic and abiotic variables was evaluated in a fish pond. Three points of the pond were marked for the taking of samples: 5, 10 and 23 m from the aerator. Samples were taken every day for 15 consecutive days: 5 days before the use of the aerator, 5 days with the aerator functioning and 5 days with it not functioning. The limnological variables studied did not show significant differences (P > 0.05) when the three sampling points were compared, but regarding the use of the aerator, variables such as water temperature, transparency, pH, dissolved oxygen, bicarbonate, free CO 2 , total phosphorus, orthophosphate, ammonia nitrate and nitrite concentrations showed significant differences (P < 0.05) when the water was mechanically agitated. There were no significant differences (P > 0.05) with the use of the aerator regarding conductivity, alkalinity, total CO 2 and chlorophyll a values. The phytoplanktonic community suffered as a direct influence of the aerator (P < 0.05). The community was dominated by Chlorophyta, representing more than 70% of the total organisms present, followed by Cyanophyta and Chrysophyta which tended to increase in number after the use of the aerator. This probably occurred because these groups adapt quickly to changes in the environment.Key words: mechanical aeration, limnological characteristics, pond. RESUMO Utilização da aeração mecânica e seu efeito na massa de águaDevido ao crescente aumento do uso de aeradores artificiais em sistema de cultivo de peixes e à carência de estudos nesta área, este trabalho avaliou a influência de um aerador tipo "propeller diffuser" (AR 120) nas variáveis bióticas e abióticas em um viveiro de engorda de peixe. Foram demarcados três pontos de coleta localizados a 5, 10 e 23 m de distância do aerador, durante 15 dias consecutivos, sendo 5 dias antes do uso do aerador, 5 dias com o aerador ligado e 5 dias com o aerador desligado. As variáveis limnológicas estudadas não apresentaram diferenças significativas (P > 0,05) entre os três pontos de coleta, porém, em relação ao uso do aerador, variáveis como temperatura, transparência, pH, oxigênio dissolvido, bicarbonato, CO 2 livre, fósforo total, ortofosfato, amônia, nitrato e nitrito diferiram significativamente (P < 0,05) com a agitação mecânica da água. Já a condutividade, alcalinidade, CO 2 total e clorofila a não apresentaram diferenças significativas (P > 0,05) com o uso do aerador. A comunidade fitoplanctônica sofreu influência direta do aerador (P < 0,05), dominada pelas Chlorophyta, representando mais de 70% do total de organismos presentes, seguidas das Cyanophyta e Chrysophyta, porém estas últimas tenderam a aumentar após o uso do aerador, uma vez que estes grupos se adaptam rapidamente às mudanças do ambiente. Palavras

show abstract

The seasonal response of diatom communities to variable water quality in some English urban lakes

Cited by 8 publications

References 1 publication

Using diatoms as quality indicators for a newly-formed urban lake and its catchment

Using diatoms as quality indicators for a newly-formed urban lake and its catchment

Diatoms as indicators of water quality in some English urban lakes

The use of mechanical aeration and its effects on water mass

Contact Info

Product

Resources

About