Trends of phytoplankton characteristics and their communities in pre- and post-liming time in Lake Orta (1984-1998)

Submitted: 9 December 2011
Accepted: 9 December 2011
Published: 1 February 2001
Abstract Views: 1655
PDF: 695
Publisher's note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

Authors

This paper is an assessment of the changing properties of Lake Orta phytoplankton in the period 1984-1998, which includes the large-scale liming carried out in the lake in 1989 and 1990. The phytoplankton is analysed first in its general properties (abundance, biovolume, chlorophyll-a concentration, average cell size, diversity) by means of time courses of the mentioned variables based on monthly data through the entire period, and by correlations between the same variables. Moreover, through clustering techniques, the evolution of the species composition has been studied, showing the gradual decrease of chlorophytes after the liming and the noticeable increase of the diatom population, both as biovolume and diversity. Although the assemblage of the dominant species still mirrors the presence of some residual toxic compounds into the lake water, in the most recent period the evolution of the algal populations showed a clear trend towards a species assemblage more similar to those observed in the other deep italian subalpine lakes. After the improving of the chemical environment, the main abiotic factor that in the next years could play a major role in modifying the species assemblage is probably the phosphorus supply, whose in-lake concentration is low, despite the high annual load from the basin. A better understanding of the mechanisms underlying the phosphorus dynamics represent the basis to make reliable hypotheses about the future evolution of the phytoplankton assemblage.

Dimensions

Altmetric

PlumX Metrics

Downloads

Download data is not yet available.

Citations

How to Cite

MORABITO, Giuseppe, Delio RUGGIU, and Pierisa PANZANI. 2001. “Trends of Phytoplankton Characteristics and Their Communities in Pre- and Post-Liming Time in Lake Orta (1984-1998)”. Journal of Limnology 60 (1):91-100. https://doi.org/10.4081/jlimnol.2001.91.

Similar Articles

You may also start an advanced similarity search for this article.

List of Cited By :

Crossref logo