Hutchinson's heritage: the diversity-disturbance relationship in phytoplankton

Sommer, Ulrich; Padisák, Judit; Reynolds, C. S.; Juhász‐Nagy, P.

doi:10.1007/bf00008837

Cited by 200 publications

(100 citation statements)

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“…The species diversity can be considered high at Caçó pond. According to the Intermediate Disturbance Hypothesis, formulated by Connell (1978), the high diversity must be related to disturbances of intermediate frequencies or intensities, however must be based in sampling scales close to the algae generation time, regularly done, through several years (Sommer et al, 1993). In Brazil, few water bodies were studied along many years and the Caçó pond is not an exception.…”

Section: Discussionmentioning

confidence: 99%

Limnological characteristics and seasonal changes in density and diversity of the phytoplanktonic community at the Caçó pond, Maranhão State, Brazil

Dellamano-Oliveira

Senna

Taniguchi

2003

Braz. arch. biol. technol.

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Section: Discussionmentioning

confidence: 99%

Limnological characteristics and seasonal changes in density and diversity of the phytoplanktonic community at the Caçó pond, Maranhão State, Brazil

Dellamano-Oliveira

Senna

Taniguchi

2003

Braz. arch. biol. technol.

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“…However, it is important to point out that these species did not occur in high densities, suggesting that the current state of the Cachoeira Dourada reservoir, albeit not one of eutrophication according to the criteria adopted by the CONAMA resolution, shows a strong tendency for the establishment of this trophic state. The system's hydrodynamics seems to operate as a continual regenerator of habitat conditions, preventing the community from maturing and thus reaching a state of equilibrium (Sommer et al, 1993). This fact explains the lack of dominance and the low density of phytoplankton species recorded in the Cachoeira Dourada reservoir.…”

Section: Discussionmentioning

confidence: 99%

Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

Oliveira

Peret

2011

Braz. J. Biol.

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The limnological features and the phytoplankton community of the Cachoeira Dourada reservoir were analyzed in December 2006, May 2007 and November 2007. Temporal changes in the taxonomic composition, density, diversity and dominance of species were analyzed in relation to climatic factors and the physical and chemical characteristics of the water. A positive correlation was found between some of the physical and chemical variables and the phytoplankton community. According to the CCA, variables such as the extent of the euphotic zone, temperature, pH, nitrogen and phosphorus concentrations directly affected the phytoplankton dynamics. Organisms belonging to the class Cyanophyceae were the most representative in all the sampling periods, comprising the functional groups K, S1, M and H. Hydrodynamics and seasonal fluctuations of environmental factors were the driving forces determining the composition and abundance of the algal assemblages. Despite the prevalence of Cyanobacteria, the reservoir is still oligotrophic. The absence of blooms and the relatively low population abundances indicated that the quality of the reservoir's water still lies within the limits required for its multiples uses.Keywords: Cachoeira Dourada, phytoplankton ecology, tropical reservoir, algal community. Estrutura da comunidade fitoplanctônica do reservatório de Cachoeira Dourada, GO/MG, Brasil ResumoAs características limnológicas e a comunidade fitoplanctônica do reservatório de Cachoeira Dourada foram analisadas nos meses de dezembro de 2006, maio de 2007 e novembro de 2007. As flutuações temporais na composição taxonômica, densidade, diversidade e dominância de espécies foram analisadas em relação aos fatores climáticos e às variáveis físicas e químicas da água. Uma correlação positiva foi encontrada entre algumas das variáveis físicas e químicas analisadas e a comunidade fitoplanctônica. De acordo com a CCA, variáveis como a extensão da zona eufótica, temperatura, pH, nitrogênio e fósforo influenciaram diretamente na dinâmica do fitoplâncton. Organismos pertencentes à classe Cyanophyceae foram as mais representativas em todos os períodos amostrais, abrangendo os grupos funcionais K, S1, M e H. A hidrodinâmica e a variação sazonal dos fatores ambientais foram as forças determinantes da composição e abundância das assembleias de algas. Apesar do predomínio de cianobactérias, o ambiente do reservatório ainda é oligotrófico. A ausência de florações e as abundâncias populacionais relativamente baixas indicaram que a qualidade da água do reservatório continua se mantendo dentro dos limites estipulados para seus usos múltiplos.Palavras-chave: Cachoeira Dourada, ecologia de fitoplâncton, reservatório tropical, comunidade algal.

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“…Phytoplankton diversity is highly sensitive to environmental disturbances (SOMMER et al 1993) and thus shows considerable spatial and temporal variability both in rivers and lakes. It is indisputable that detailed description of diversity needs long-term monitoring data for the phytoplankton.…”

Section: Diversitymentioning

confidence: 99%

Diatom composition of the rheoplankton in a rhithral river system

Bolgovics

Ács

Várbíró

et al. 2015

Acta Botanica Croatica

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-Diatom composition of the rheoplankton (phytoplankton) in the Sajó-Hernád river system (Slovakia and Hungary) was studied. Forty two sample sites were designated on the watershed from source to mouth of the two rivers and their tributaries. Samples were taken in July 2012. Altogether, 258 diatom taxa were identifi ed. The microfl ora was dominated by tychoplanktonic elements. According to the relative abundance of the occurring taxa, four groups could be distinguished. Differentiation of these groups was confi rmed by differences in the habitat characteristics, viz. altitude, width of watercourse, macrophyte coverage and river bed material. Diversity of diatom taxa in the phytoplankton was also studied. A positive relationship was found between the macrophyte coverage and the Simpson and the Shannon indices. In contrast, a negative relationship was shown between the macrophyte coverage and Berger-Parker diversity, in which metric the role of the dominant taxa is emphasized. Although the phytoplankton in rhithral rivers is infl uenced by stochastic events, our results reveal that geographical and hydromorphological characteristics of the rivers and coverage of macrophytes can also play role in shaping the composition and diversity of the phytoplankton.

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Hutchinson's heritage: the diversity-disturbance relationship in phytoplankton

Abstract: This paper introduces a collection of contributions presented at the 8th Workshop of the International Association of Phytoplankton Taxonomy and Ecology. It compares the substance of with what to

Cited by 200 publications

References 32 publications

Limnological characteristics and seasonal changes in density and diversity of the phytoplanktonic community at the Caçó pond, Maranhão State, Brazil

Limnological characteristics and seasonal changes in density and diversity of the phytoplanktonic community at the Caçó pond, Maranhão State, Brazil

Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

Diatom composition of the rheoplankton in a rhithral river system

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