The infulence of tufa deposition on macroalgae and epiphytic fauna in Lake Prošde

Sviben, Sanja (2012) The infulence of tufa deposition on macroalgae and epiphytic fauna in Lake Prošde. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Biomineralization is the process by which organisms create or participate in creating a mineral. It is widespread among different groups of organisms. However, consequences that this process has in ecological context are still not clear. Alga of genus Chara was the model organism in this research where effect of biomineralization on epiphitic fauna was studied. Alga was collected in Lake Prošde which is a part of tufa depositing system Plitvice lakes at depths of 1, 5 and 10 meters. Analysis of epiphitic fauna showed high diversity, and its abundance was negatively correlated with tufa deposits on the surface of the talus. Analysis of the isotops 13C and 18O of tufa deposits indicates that tufa deposits on the surface of the talus are a result of biological activity. Spectrophotometric measurements of the amount of photosynthetic pigments in algal talus showed decrease in the ratio chlorophill a : chlorophill b and increase in the ratio chlorophill a : carotenoids with decreasing depth of the lake. This is most likely a result of the mechanisms which tend to increase efficiency of light utilization and protect alga from potentially harmful radiation. Also, amount of photosynthetic pigments and amount of tufa deposited on algal surface showed statistically significant correlation.

Item Type: Thesis (Diploma thesis)
Keywords: Chara, biomineralization, Plitvice lakes, epiphitic fauna, photosynthetic pigments
Supervisor: Matoničkin Kepčija, Renata
Date: 2012
Number of Pages: 61
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 06 Jun 2014 07:55
Last Modified: 22 Sep 2014 08:18
URI: http://digre.pmf.unizg.hr/id/eprint/2278

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