prikaz prve stranice dokumenta Seascape context and local predators drive fish community structure of Posidonia oceanica meadows
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doctoral thesis
Seascape context and local predators drive fish community structure of Posidonia oceanica meadows
Split: University of Split, 2020. urn:nbn:hr:226:388507
Zubak Čižmek, Ivana
University of Split

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Zubak Čižmek, I. (2020). Seascape context and local predators drive fish community structure of Posidonia oceanica meadows (Doctoral thesis). Retrieved from https://urn.nsk.hr/urn:nbn:hr:226:388507

Zubak Čižmek, Ivana. "Seascape context and local predators drive fish community structure of Posidonia oceanica meadows." Doctoral thesis, University of Split, 2020. https://urn.nsk.hr/urn:nbn:hr:226:388507

Zubak Čižmek, Ivana. "Seascape context and local predators drive fish community structure of Posidonia oceanica meadows." Doctoral thesis, University of Split, 2020. https://urn.nsk.hr/urn:nbn:hr:226:388507

Zubak Čižmek, I. (2020). 'Seascape context and local predators drive fish community structure of Posidonia oceanica meadows', Doctoral thesis, University of Split, accessed 27 September 2022, https://urn.nsk.hr/urn:nbn:hr:226:388507

Zubak Čižmek I. Seascape context and local predators drive fish community structure of Posidonia oceanica meadows [Doctoral thesis]. Split: University of Split; 2020 [cited 2022 September 27] Available at: https://urn.nsk.hr/urn:nbn:hr:226:388507

I. Zubak Čižmek, "Seascape context and local predators drive fish community structure of Posidonia oceanica meadows", Doctoral thesis, University of Split, Split, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:226:388507

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TitleSeascape context and local predators drive fish community structure of Posidonia oceanica meadows
Title (croatian)Utjecaj prostorne organizacije elemenata podmorskog okoliša i predatora na strukturu zajednica riba u naseljima morske cvjetnice Posidonia oceanica
AuthorIvana Zubak Čižmek
MentorStewart Schultz (mentor)
Committee memberMirela Petrić (predsjednik povjerenstva)
Committee memberZvjezdana Popović Perković (član povjerenstva)
Committee memberAntonela Paladin (član povjerenstva)
GranterUniversity of Split
Split
Defense date and country2020-07, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Interdisciplinary Natural Sciences
Universal decimal classification
(UDC)		59 - Zoology
Abstract
Marine underwater habitats dominated by seagrass Posidonia oceanica play an important role in the assembly of fish communities, affecting taxonomic and functional diversity, abundance, and fish behavior. In order to identify the relative importance of different seascape contexts of P. oceanica meadows as a habitat for fishes, fish communities associated with the seagrass P. oceanica were investigated in the Croatian Adriatic Sea, using SCUBA lure-assisted visual census. To test for the effect of predators on fish community structure, existing literature data on fish assemblages associated with P. oceanica meadows in the Mediterranean was assembled and a meta-analysis was performed. The results show: I) There is a significant effect of different arrangement of seascape elements on fish community structure -- fragmented mosaic meadows with P. oceanica growing directly on and between rocky-algal reefs had significantly higher fish abundances compared to both types of continuous meadows (bordering rock and bordering sand); and II) Total predator abundance and abundance of resident predators had a significant effect on the prey fish community -- a higher abundance of resident predator species was associated with an overall lower number of prey species. This thesis provides evidence that alternative structured habitats within close proximity to seagrass beds may affect the community structure of associated fish assemblages and that the presence of predators reduces the value of P. oceanica meadows as a refuge habitat for potential prey species. The dissertation aims at highlighting the need for the consideration of the seascape context of P. oceanica meadows in conservation management and experimental design for fish community structure while acknowledging the importance of resident predators when evaluating the relative value of this important seagrass as a habitat for the Mediterranean fish assemblages.
Abstract (croatian)
Naselja morske cvjetnice Posidonia oceanica igraju važnu ulogu u strukturiranju zajednica riba te utječu na taksonomsku i funkcionalnu raznolikost, brojnost i ponašanje riba. Nedovoljno je poznato koji sve čimbenici utječu na strukturu zajednice riba povezanih s ovom morskom cvjetnicom. S ciljem utvrđivanja utjecaja različite prostorne organizacije elementa podmorskog okoliša na zajednice riba, proveden je vizualni cenzus uz pomoć mamca u naseljima cvjetnice P. oceanica u hrvatskom dijelu Jadranskog mora. Kako bi se ispitao utjecaj predatora na strukturu zajednica riba u naseljima morske cvjetnice P. oceanica na razini Sredozemnog mora, provedena je meta-analiza podataka u objavljenim znanstvenim radovima. Utvrđen je značajan utjecaj različite prostorne organizacije elementa podmorskog okoliša na strukturu zajednice riba – u rascjepkanim mozaičnim naseljima u kojima se P. oceanica isprepliće s kamenom podlogom obraslom makro-algama zabilježena je značajno veća brojnost riba u odnosu na kontinuirana cjelovita naselja (uz sediment ili uz kamenitu obalu). Ukupna brojnost predatora i brojnost stalno nastanjenih predatora pokazuje značajan utjecaj na zajednicu riba – povećanje brojnosti predatorskih vrsta dovodi do smanjenja broja vrsta u zajednici plijena. U radu su predstavljeni dokazi da dostupnost alternativnih strukturiranih staništa u neposrednoj blizini naselja morske cvjetnice P. oceanica utječe na strukturu zajednice riba koje u njoj žive te da prisustvo predatora smanjuje relativnu vrijednost naselja morske cvjetnice P. oceanica kao staništa za ribe koje predstavljaju potencijalni plijen. Neophodno je uzeti u obzir kontekst prostornog rasporeda elemenata podmorskog okoliša kojima dominira morska cvjetnica P. oceanica prilikom planiranja znanstvenih istraživanja, ali i kod upravljanja priobalnim područjima. Također je važno razmotriti utjecaj lokalnih, stalno nastanjenih predatora kada se procjenjuje relativni značaj naselja ove važne morske cvjetnice kao staništa za ribe na području Sredozemnog mora.
Keywords
Keywords (english)
Languageenglish
URN:NBNurn:nbn:hr:226:388507
Study programmeTitle: Applied Marine Sciences
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje interdisciplinarne prirodne znanosti (doktor/doktorica znanosti, područje prirodnih znanosti, polje interdisciplinarne prirodne znanosti)
Catalog URLhttp://libar.svkst.unist.hr/cgi-bin/unilib.cgi?form=D1181215095106
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence Attribution 4.0 International (CC BY 4.0) icon
RepositoryRepository of University Department of Marine Studies
Created on2021-05-05 11:26:08

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