Rasprostranjenost i biometrijska obilježja hridinskog (Paracentrotus lividus (Lamarck, 1816)) i crnog ježinca (Arbacia lixula (Linnaeus, 1758)) uz istočnu obalu otoka Cresa

master's thesis

• Title (english): Distribution and biometrical characteristics of purple (Paracentrotus lividus (Lamarck, 1816)) and black sea urchin (Arbacia lixula (Linnaeus, 1758)) along the eastern coast of the island of Cres
• Author: Sonja Šoštarić
• Mentor: Petar Kružić (mentor)
• Committee member: Petar Kružić (predsjednik povjerenstva)
• Committee member: Sandra Radić Brkanac (član povjerenstva)
• Committee member: Ana Galov (član povjerenstva)
• Committee member: Davor Zanella (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2014-02-24, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Ježinci (Echinoidea) su rasprostranjeni u svim morima svijeta, a samo u Jadranskom moru živi 20 vrsta. Najbrojnije vrste iz skupine Regularia u Jadranskom moru su hridinski ježinac Paracentrotus lividus (Lamarck, 1816) i crni ježinac Arbacia lixula (Linnaeus, 1758). Hridinski ježinac obitava u plitkom infralitoralnom pojasu, na dnu obraslom biljnim vrstama. Crni ježinac živi na dubinama do 50 metara pričvršćen za tvrdo dno. U ovom radu je na lokacijama, na otoku Cresu, fotodokumentiranjem utvrđena prisutnost ježinaca na površini od 4 m2 na dubini do 3 m. Zastupljenost pronađenih vrsta i biometrijske karakteristike određene su pregledom i mjerenjem promjera čahure i mokre mase na uzorku od 30-40 jedinki. Rezultati su pokazali da je hridinski ježinac brojnija vrsta. Analizom rezultata istraživanja zastupljenosti, gustoće i biometrijskih karakteristika ježinaca s lokacija utvrđeni su razlozi zbog kojih je na određenoj lokaciji brojnija određena vrsta ježinca. Uvjeti okoliša određuju rasprostranjenost, brojnost i biometrijske karakteristike ježinaca.

Abstract (english)

Urchins (Echinoidea) are distributed all over the oceans and just in the Adriatic Sea there are 20 species. From the group of Regularia, most common in the Adriatic Sea are purple sea urchin Paracentrotus lividus (Lamarck, 1816) and black sea urchin Arbacia lixula (Linnaeus, 1758). Purple sea urchin inhabits shallow infralittoral, vegetation-covered sea bottom. Black sea urchin inhabits infralittoral zone at depths up to 50 meters attached on the hard sea bottom. In this research, on locations on the Island of Cres, sea urchins were photodocumented on depths close to 3 meters. Two found species ware analysed and their biometrical characteristics were measured. The results have shown that purple sea urchin is more frequent species. Analysis of the results on frequency, density and biometrical characteristics of sea urchins has given a view in reasons why certain species are more abundant than other in certain locations. Environmental conditions determine the distribution, abundance and biometrical characteristics of sea urchins.

• Keywords: brojnost; ježinac; gustoća; zastupljenost; biomasa
• Keywords (english): abundance; sea urchin; density; frequency; biomass
• Language: croatian
• URN:NBN: urn:nbn:hr:217:912840
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-04-26 12:30:37