Utjecaj globalnih klimatskih promjena na greben koralja Cladocora caespitosa (Linnaeus, 1767) u Nacionalnom parku Mljet

master's thesis

• Title (english): The influence of global climate change on Cladocora caespitosa bank in the National Park Mljet
• Author: Rita Guić
• Mentor: Petar Kružić (mentor)
• Committee member: Petar Kružić (predsjednik povjerenstva)
• Committee member: Blanka Cvetko Tešović (član povjerenstva)
• Committee member: Ivan Čanjevac (član povjerenstva)
• Committee member: Ana Galov (član povjerenstva)
• Committee member: Alan Moro (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2019-03-07, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Tijekom istraživanja u 2018. godini utvrđene su povećane temperature mora (temperaturne anomalije) do 29 °C u Velikom jezeru (NP Mljet). Negativan utjecaj povišene temperature mora vidljiv je prvenstveno kao odumiranje (nekroza) tkiva na kamenim koraljima te kao mortalitet jedinki i smanjenje populacija. Usporedba promjena u Velikom jezeru u zadnjih 20 godina kod grebena koralja pokazuje pozitivnu korelaciju između povišenja temperature mora i povećanja nekroze tkiva i smrtnosti koralja. Mjerenjem brzine rasta čaški koralja radiografskom metodom utvrđene su manje vrijednosti brzine rasta za razdoblje od 2002. do 2018. godine u odnosu na razdoblje od 1980. do 2002. godine. Rast čaški kolonija pokazuje pozitivnu korelaciju s prosječnom godišnjom temperaturom mora u Velikom jezeru. Brzina rasta vrste Cladocora caespitosa na grebenu izmjerena u ovom radu (od 1,75 mm do 5,67 mm godišnje) podudara se s rezultatima istraživanja ove vrste u Sredozemnom moru. Koralj C. caespitosa pokazuje stupnjeve oštećenja populacija vezano za temperaturne anomalije. Uz nekrozu tkiva polipa koralja utvrđeno je i izbacivanje simbiontskih zooksantela (engl. coral bleaching), što je dokaz temperaturnog šoka. Značajan je udio novih nekroza unutar istraživanih kvadrata na grebenu utvrđenih prilikom ovog istraživanja tijekom 2018. godine. Invazivna alga Caulerpa cylindracea i riba papigača Sparisoma cretense velike su prijetnje grebenu koralja C. caespitosa u Velikom jezeru.

Abstract (english)

The research conducted in 2018. showed an increased sea temperature (temperature anomaly) which reached 29°C in Veliko jezero (Mljet National Park). Negative impact of an increased sea temperature is primarily visible through tissue necrosis of stony corals. Comparison of changes in Veliko jezero in the last 20 years on coral reef shows a positive correlation between increased sea temperature and necrosis of corals and mortality. Measuring the growth rate of the corals using X-ray method, lower values of growth rate for the period from 2002 to 2018 were determined compared to the period from 1980 to 2002. The growth of the coral colony shows a positive correlation with the average annual sea temperature in Veliko jezero. The growth rate of the Cladocora caespitosa species on the reef measured in this paper (from 1.75 mm to 5.67 mm per year) is consistent with the results gathered in the study in the Mediterranean Sea. Coral C. caespitosa shows degrees of population damage due to temperature anomalies. Along with necrosis, coral bleaching was also detected, which is a proof of temperature shock. Significant share of new necrosis was established within the investigated squares at the reef during this research in 2018. Invasive algae Caulerpa cylindracea and parakeet fish Sparisoma cretense are great threats to the coral reef of C. caespitosa in Veliko jezero.

• Keywords: Cladocora caespitosa; NP Mljet; greben koralja; klimatske promjene; Jadransko more
• Keywords (english): Cladocora caespitosa; NP Mljet; coral reef; climate change; Adriatic Sea
• Language: croatian
• URN:NBN: urn:nbn:hr:217:747614
• Study programme: Title: Enviromental Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra struke znanosti o okolišu (magistar/magistra struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-04-10 09:35:03