Veličinska i starosna struktura populacije plemenite periske (Pinna nobilis) u Malom jezeru Nacionalnog parka Mljet

master's thesis

• Title (english): Size and age structure of fan mussel (Pinna nobilis) population in Malo jezero, National Park Mljet
• Author: Mia Šepčević
• Mentor: Petar Kružić (mentor)
• Committee member: Petar Kružić (predsjednik povjerenstva)
• Committee member: Jasna Lajtner (član povjerenstva)
• Committee member: Tvrtko Dražina (član povjerenstva)
• Committee member: Duje Lisičić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2022-04-27, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Plemenita periska (Pinna nobilis Linneanus, 1758) je jedan od najvećih školjkaša i endem
Sredozemnog mora. Zbog masovnog pomorom koji se pojavio 2016. u zapadnom Sredozemlju
brojnost joj opada, a u Jadranskom moru je pomor zabilježen tek 2019. godine. Cilj ovog rada je
odrediti starosnu i veličinsku strukturu populacije plemenite periske u Malom jezeru Nacionalnog
parka Mljet prije masovnog pomora. Terensko istraživanje za vrijeme kojeg su sakupljeni podaci
o brojnosti jedinki i morfometrijskim mjerama je provedeno u ljeto 2018. Zabilježeno je 3800
jedinki, od kojih je 3567 bilo živo. Prosječna gustoća populacije bila je 30,96 ± 14,42 jedinki/100
m2
čime je ovo jedna od najgušćih zabilježenih populacija u Jadranskom moru. Najboljom
jednadžbom za izračun ukupne dužine školjke na ovom lokalitetu se pokazala jednadžba: 𝐻𝑡 =
1,79𝑤 + 0,5 + 𝑈𝐿 gdje je Ht ukupna dužina školjke, w je minimalna širina, a UL je dužina
nezakopanog dijela školjke. Prosječna izračunata ukupna dužina jedinki bila je 62,20 ± 6,39 cm, a
najveća jedinka imala je 87,30 cm. Iz ukupne dužine jedinki izračunata je starost populacije te je
50 % jedinki bilo u starosnom rasponu od 10 do 15 godina. Također, zamijećena je pozitivna
korelacija između veličine plemenitih periski i dubine na kojoj se nalaze.

Abstract (english)

The fan mussel (Pinna nobilis Linneanus, 1758) is one of the largest shellfish and endemic to the
Mediterranean Sea. Due to the mass mortality event that started in 2016., while in the Adriatic Sea
was documented in 2019, its numbers were sharply reduced. This paper aims to determine the age
and size structure of the fan mussel population in Malo jezero, Mljet National Park before the mass
mortality event. Field research during which data on the number of individuals and morphometric
measures were collected was conducted in the summer of 2018. 3800 specimens of fan mussel
were recorded, of which 3567 were alive. The average population density was 30,96 ± 14,42
individuals/100 m2
, making this one of the densest recorded populations in the Adriatic Sea. The
best formula for calculating the total length of the shell, in this case, was: 𝐻𝑡 = 1,79𝑤 + 0,5 + 𝑈𝐿
where Ht is the maximum shell length, w is the minimum width and UL is the unburied length.
The average calculated total length of individuals was 62,20 ± 6,39 cm while the largest individual
was 87,30 cm. The age of the population was calculated from the total length of the individuals
and 50 % of individuals were in the age range of 10 to 15 years. In addition, a positive correlation
was observed between the size of the fan mussel and the depth at which they were found.

• Keywords: školjkaši; gustoća; sediment; Jadransko more; morfometrija; dubina
• Keywords (english): shellfish; density; sediment; Adriatic sea; morphometry; depth
• Language: croatian
• URN:NBN: urn:nbn:hr:217:401359
• 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; Embargo expiration date: 2023-04-27
• Created on: 2022-05-25 07:28:13