Ekologija zajednica s dominacijom gorgonija u istočnom dijelu Jadranskog mora

doctoral thesis

• Title (english): Ecology of gorgonian dominated communities in the eastern Adriatic sea
• Author: Silvija Kipson
• Mentor: Tatjana Bakran-Petricioli (mentor)
• Committee member: Marija Despalatović (član povjerenstva); MBZ: 239860
• Committee member: Tatjana Bakran-Petricioli (član povjerenstva)
• Committee member: Petar Kružić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2013, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology
• Universal decimal classification (UDC): 57 - Biological sciences. Physical anthropology. Biodiversity

Abstract

Cilj je ove disertacije bio dvostruk: (i) utvrditi nulto stanje za izuzetno vrijednu, no nedovoljno istraženu koraligensku zajednicu s dominacijom crvene gorgonije Paramuricea clavata te provesti prvo istraživanje populacija gorgonija P. clavata i Eunicella cavolini u istočnom dijelu Jadrana kao i (ii) istražiti potencijalne posljedice globalnog zagrijavanja na koraligensku zajednicu koristeći crvenu gorgoniju P. clavata kao model organizam. Primjenom iste metode (podvodne fotografije) i napora uzorkovanja utvrđeno je veće bogatstvo vrsta u jadranskim zajednicama nego u zapadno mediteranskim, te značajne razlike u bioraznolikosti makrobentosa između lokacija i istraživanih dubina, što upućuje da buduće praćenje stanja treba usmjeriti prema pojedinoj lokaciji. Visok udio velikih odraslih kolonija crvene gorgonije, velika brojnost juvenilnih kolonija te ukupna niska gustoća upućuju na populacijsku strukturu koja se razlikuje od strukture zapadno mediteranskih populacija. Uz podatke dobivene za rijetko istraživanu žutu gorgoniju E. cavolini, rezultati ovog istraživanja daju novi uvid u strukturu mediteranskih populacija gorgonija. Nadalje, utvrđen je povoljan konzervacijski status istraživanih populacija no zabilježene su i potencijalne ugroze. Eksperimentalni rezultati pokazuju da produženo gladovanje nakon energetski nepovoljnog ljetnog razdoblja značajno umanjuje termotoleranciju crvene gorgonije dok je prisustvo hrane u istom razdoblju unaprijeđuje. No, razlike u fiziološkom statusu ne mogu objasniti sve interkolonijalne i interpopulacijske razlike u odgovoru crvene gorgonije na termalni stres. Nadalje, termalni stres značajno smanjuje preživljavanje embrija i ličinki crvene gorgonije, uzrokuje abnormalni embriološki razvoj te onemogućuje preobrazbu ličinki. Njihova smanjena vijabilnost ugrožava opstojnost crvene gorgonije kojoj je potrebno uspješno novačenje za obnovu populacija.

Abstract (english)

The aims of this thesis were twofold: (i) to provide quantitative baseline data for highly valuable but highly understudied coralligenous assemblages dominated by the red gorgonian Paramuricea clavata and the first assessment of P. clavata and Eunicella cavolini populations in the Eastern Adriatic Sea, as well as (ii) to explore the potential consequences of warming on the coralligenous community by examining the effects on the model organism, the red gorgonian P. clavata. Underwater photo-sampling with comparable sampling effort revealed higher species richness of the Adriatic P. clavata assemblages in comparison to the NW Mediterranean ones and significant inter-site and inter-depth variability of macrobenthic biodiversity, implying future site-based monitoring. High proportion of large adult P. clavata colonies, high abundance of juvenile colonies and low density values contrast with demographic structure reported from the NW Mediterranean. Together with results obtained for scarcely studied E. cavolini populations, these data provide new insights into the demographic structure of Mediterranean gorgonian forests. Further, conservation status of examined populations was assessed as favourable, but potential threats were also detected. The results of experimental studies implied that prolonged starvation after energetically unfavourable summer period significantly decreases P. clavata thermotolerance, while food availability promotes it. However, differences in physiological status cannot explain all of inter-colony and inter-population variability found in response of P. clavata to thermal stress. Further, thermal stress had severe negative effect on P. clavata embryos and larvae, resulting in significantly reduced survivorship, completely abnormal embryonic development and impaired metamorphosis. Their reduced viability would jeopardize the persistence of P. clavata, which relies on successful recruitment for replenishment of its populations.

• Keywords: koraligen; koralj; gorgonija; Paramuricea clavata; Eunicella cavolini; klimatske promjene; termički stres; Jadransko more
• Keywords (english): coralligenous assemblages; coral; gorgonian; Paramuricea clavata; Eunicella cavolini; climate change; thermal stress; Adriatic Sea
• Language: croatian
• URN:NBN: urn:nbn:hr:217:683428
• Study programme: Title: Biology; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje biologija (doktor/doktorica znanosti, područje prirodnih znanosti, polje biologija)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2017-05-19 08:52:29