Reproduction cycle of the gorgonian Eunicella singularis (Esper, 1791) in Cap de Creus (Spain) deep shelf area

Šimunović, Ivana (2014) Reproduction cycle of the gorgonian Eunicella singularis (Esper, 1791) in Cap de Creus (Spain) deep shelf area. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Gorgonians are sessile organisms which play an important structural and ecological role, potentially providing a shelter to epifauna, increasing biomass and biodiversity. The majority of studies in Mediterranean have been conducted on shallow water populations of gorgonians (depths of less than 40 m). Gorgonians reproduce both sexually and asexually. The product of sexual reproduction is a ciliated, free-swimming, planula larvae which settles down on the sea bottom. The main goal of this study is to describe, for the first time, reproduction cycle and fecundity of Eunicella singularis which dwells on the continental shelf at depth of 90 m. The sex ratio did not significantly differ from 1:1, not a single hermaphroditic colony was found within the 238 colonies examined. Female colonies needed 14-15 months to complete their reproductive cycle, while for male colonies, the whole cycle was completed in 5-6 months. Temperature, the most important and the most often examined factor which may influence the gorgonian reproduction cycle, did not have any impact on gametogenesis of E. singularis. Therefore, reproduction is higly probable regulated on genetic level of the species.

Item Type: Thesis (Diploma thesis)
Keywords: gorgonians, reproduction cycle, sex ratio, environmental influence, temperature
Supervisor: Gili, Josep-Maria and Kružić, Petar
Date: 2014
Number of Pages: 46
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 12 Nov 2014 11:45
Last Modified: 12 Nov 2014 11:45
URI: http://digre.pmf.unizg.hr/id/eprint/3238

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