Basic characteristics of seagrass Posidonia oceanica (L.) Delile meadows in shallow sea

Grbčić, Ana (2012) Basic characteristics of seagrass Posidonia oceanica (L.) Delile meadows in shallow sea. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Posidonia oceanica (L.) Delile is an endemic species in the Mediterranean, whose meadows, due to the high primary production and biomass, represent one of the most productive ecosystems of the sea. It inhabits subtidal areas of warm tropical and temperate seas where it forms dense meadows that represent shelter, home and source of food for many benthic organisms. The goal of this research was to determine the main characteristics of Posidonia meadows in three locations in wider Zadar area. Posidonia samples were collected in April 2011 at 2 m of depth at station Ženski Banj (Zadar channel), and at 3 m of depth at Brbišćica bay (Dugi otok) and Zaglav bay (Dugi otok). A total of 64 samples of seagrass were collected, and a total of 147 shoots were processed. Density was estimated in situ at all three locations in ten squares with 40x40 cm surface area. Leaf biometry and lepidochronological analysis were performed and the biomass and primary production were estimated for the collected Posidonia samples. The highest density was observed at station Ženski Banj (1013±353 shoots per m2), and lowest at station Brbišćica (402±32 shoots per m2). Leaf area index was the largest on Ženski Banj (116586,17 cm2/m2) and lowest at Zaglav (66690,30 cm2/m2). Biomass per m2 was the largest for the meadow on Ženski Banj (295,41 g DW per m2), and the lowest in Zaglav bay (86,69 g DW per m2). The maximum value of primary production was obtained for the station Ženski Banj (1409,48 g DW per m2/y; 2008), while the lowest value was in Zaglav bay (158,16 g DW per m2/y; 2005). Given the density and primary productivity, the Posidonia bed at station Ženski Banj in Zadar channel is the best developed, while the one at station Zaglav is the least developed.

Item Type: Thesis (Diploma thesis)
Keywords: Posidonia oceanica, biometry, lepidochronology, primary production
Supervisor: Bakran-Petricioli, Tatjana
Date: 2012
Number of Pages: 38
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 25 Feb 2014 12:30
Last Modified: 19 Sep 2014 10:02
URI: http://digre.pmf.unizg.hr/id/eprint/493

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