Sakupljači ličinki školjkaša u Nacionalnom parku Brijuni kao sredstvo prikupljanja mlađi plemenite periske (Pinna nobilis)

master's thesis

• Title (english): Bivalve larval collectors in Brijuni National Park as a means of noble pen shell (Pinna nobilis) juvenile collection
• Author: Martina Naranđa
• Mentor: Tatjana Bakran-Petricioli (mentor)
• Committee member: Tatjana Bakran-Petricioli (predsjednik povjerenstva)
• Committee member: Sven Jelaska (član povjerenstva)
• Committee member: Zoran Tadić (član povjerenstva)
• Committee member: Sunčica Bosak (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2022-09-19, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES

Abstract

Sakupljači ličinki školjkaša, prvenstveno namijenjeni za hvatanje mlađi kritično ugrožene
plemenite periske, postavljeni su 2020. na dvije lokacije unutar Nacionalnog parka Brijuni, u uvali
Javorike i u uvali Pisak. Postavljeno po 3 replikata na 2, 4, 6, 8 i 10 metara dubine (Javorike) te na
2 i 4 m dubine (Pisak). Ciljevi rada bili su utvrditi brojnost i veličinu juvenilnih periski, utvrditi
kvalitativni i kvantitativni sastav obraštajne zajednice na sakupljačima te rezultate usporediti sa
sličnim istraživanjem provedenim 2019. godine. U uvali Javorike zabilježeno je 40, a u uvali Pisak
11 jedinki juvenilne periske. Prosječno po sakupljaču zabilježeno je 2,86 (Javorike), odnosno 2,75
(Pisak) juvenilnih periski, veličine od 0,4 do 2,5 cm (Javorike), odnosno od 0,8 do 3,4 cm (Pisak).
Smanjenje broja juvenilnih periski te smanjenje njihove maksimalne veličine u usporedbi s
rezultatima 2019. može se povezati s manje odraslih jedinki koje se razmnožavaju u okolini te sa
sporijim rastom juvenilnih jedinki na sakupljačima. U obraštajnoj zajednici u Javorikama
zabilježene su 42 svojte (12.667 jedinki) među kojima su najbrojniji školjkaši (90% udjela), zatim
rakovi (8%). U uvali Pisak zabilježeno je 38 svojti (5.098 jedinke), također su najbrojniji školjkaši
(88% udjela), puževi (6%) te rakovi (5%). Na obje lokacije najbrojnija je invazivni školjkaš
Anadara transversa (8.988 odnosno 4.093 jedinke) koja time utječe na prihvat juvenilnih periski
kao i na indekse raznolikosti zajednice.

Abstract (english)

Bivalve larval collectors, primarily aimed for noble pen shell juvenile collection, were set in 2020
in two locations within the National Park Brijuni, in Javorike Cove and in Pisak Cove. Three
replicates were set at 2, 4, 6, 8 and 10 m depth (Javorike) and at 2 and 4 m depth (Pisak). Aims of
the research were to determine number and size of juvenile pen shells, to determine qualitative and
quantitative composition of fouling community and to compare results with similar research made
in 2019. In Javorike Cove 40 and in Pisak Cove 11 individuals of juvenile noble pen shells were
noted. Average of 2.86 (Javorike), and 2.75 (Pisak) juvenile pen shells per collector were noted,
sizes 0.4 to 2.5 cm (Javorike), and 0.8 to 3.4 cm (Pisak). Reduction in the number of juvenile pen
shells and the reduction of their maximal size in comparison with the results of 2019 survey could
be connected with smaller number of spawning adults in the surrounding and with the slower
growth of juveniles in collectors. In the fouling community in Javorike 42 taxa (12.667 individuals)
were determined among which the bivalves were the most numerous (90% share), then crustaceans
(8%). In Pisak Cove 38 taxa (5.098 individuals) were determined, among which bivalves also were
the most numerous (88% share), then gastropods (6%) and crustaceans (5%). On both locations the
most numerous was invasive bivalve Anadara transversa (8.988 and 4.093 individuals
respectively), which in that way affect the attachment of juvenile pen shells as well as community
diversity indices.

• Keywords: masovni pomori; kritično ugrožena vrsta; obraštajni organizmi; invazivne vrste
• Keywords (english): mass mortalities; critically endangered species; fouling organisms; invasive species
• Language: croatian
• URN:NBN: urn:nbn:hr:217:497958
• 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: 2022-10-26 10:58:41