Utjecaj predatora na faunu koralja istočnog dijela Jadranskog mora

master's thesis

• Title (english): Impact of predators on the coral fauna of the Eastern Adriatic Sea
• Author: Ivan Karužić
• Mentor: Petar Kružić (mentor)
• Committee member: Petar Kružić (predsjednik povjerenstva)
• Committee member: Ana Galov (član povjerenstva)
• Committee member: Sven Jelaska (član povjerenstva)
• Committee member: Jasna Lajtner (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2020-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Predatori na koraljima prirodni su dio zdravog morskog ekosustava. Međutim, prekomjerna gustoća nekih predatora, poput puževa ili riba papigača, može rezultirati dramatičnim smanjenjem brojnosti koralja. Predatori koralja posjeduju različite strategije hranjenja polipima koralja. Terenski dio istraživanja proveo se na ukupno 12 lokacija (po dvije u zaštićenim područjima (PP Telašćica, NP Kornati i NP Mljet) i 6 lokacija u sastavu Natura 2000 područja). Istražen je utjecaj puževa Coralliophila meyendorffi, Babelomurex cariniferus, Simnia spelta, Pseudosimnia carnea, te riba papigača Sparisoma cretense na kamene koralje i gorgonije, te rasprostranjenost i brojnost predatora. Ekološki čimbenici (prvenstveno temperatura mora i dubina) uspoređeni su sa brojnošću predatorskih vrsta i stanjem koralja (stupanj oštećenosti jedinki i kolonija) na istraživanim postajama. Rezultatima su utvrđeni negativni utjecaji puževa predatora te papigače na faunu koralja na istraživanim postajama. Nije utvrđena direktna povezanost temperature mora i brojnosti vrsta predatora koralja. Utvrđena je povezanost temperature mora i rasprostranjenosti istraživane vrste S. cretense. Puževi predatori ovisni su o temperaturi mora samo kroz areal vrsta kojima se hrane.

Abstract (english)

Coral predators are a natural part of a healthy marine ecosystem. However, excessive densities of some corallivores, such as coral-eating snails or parrotfish can result in dramatic and widespread declines in coral cover. Coral predators have different feeding strategies for coral polyps. The field work of the research was performed at a total of 12 locations (6 in protected areas (PP Telašćica, NP Kornati and NP Mljet) and 6 in an area within the Natura 2000). The effect of sea snails Coralliophila meyendorffi, Babelomurex cariniferus, Simnia spelta, Pseudosimnia carnea, and parrotfish Sparisoma cretense on stone corals and gorgonias, as well as their distribution and abundance, was investigated. Ecological factors (primarily sea temperature and depth) were compared with the number of predatory species and the appearance of corals (degree of damage of individuals and colonies) at the studied stations. The results revealed the negative effects of predatory snails and parrotfish on coral fauna at the studied stations.There is no direct correlation between sea temperature and the number of coral predator species. The correlation between sea temperature and the distribution of the studied species S. cretense was determined. Sea snails depend on sea temperature only through the range of the species they feed on.

• Keywords: Jadransko more; tropikalizacija; koralji; bioraznolikost; predatori.
• Keywords (english): Adriatic Sea; tropicalization; corals; biodiversity; predators
• Language: croatian
• URN:NBN: urn:nbn:hr:217:859078
• 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: Open access
• Created on: 2020-09-25 11:45:44