Phytoplankton divesity indices as indicators of the ecological status of karst lakes

Ravlić, Marina (2014) Phytoplankton divesity indices as indicators of the ecological status of karst lakes. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Studies of the phytoplankton community were carried out in the lakes Kozjak, Visovac Prošće, Crniševo and Vrana Lake on the Cres island. Samples were collected monthly from April to September in 2009 and 2010, at depths of 1, 5, 10, 15, 20 and 25 meters and analyzed by Uthermöhl-method. The main objectives of this study were 1) on the basis of taxonomic species composition, abundance and biomass, determine and define phytoplankton biodiversity indices according to the HR type of lake, 2) by the amount of total phosphorus define diversity indices as possible indicators of the ecological status of each type of lake and 3) define phytoplankton based index that best describes the ecological status of each lake. It is determined that representative phytoplankton community was found in eufotic lake zone. According to total phosphorus concentrations three categories of Dinaridic ecoregion deep lakes have been defined: TP MAX 0,005 (HR_J-2), TP MAX 0,05 ( HR_J-1A, HR_J-1B, HR_J-5) I TP MAX 0,1 (HR_J-3). Due to the natural characteristics of each of the five studied lakes in Croatia, it has been concluded that is not possible to use only one index of diversity that would be applicable in assessing the ecological status for all of them.

Item Type: Thesis (Diploma thesis)
Keywords: phytoplankton, biodiversity, eutrophication, lake
Supervisor: Gligora Udovič, Marija
Date: 2014
Number of Pages: 72
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 17 Nov 2014 11:58
Last Modified: 17 Nov 2014 11:58
URI: http://digre.pmf.unizg.hr/id/eprint/3289

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