Dobna struktura i rast školjkaša Unio crassus u različitim okolišnim uvjetima

master's thesis

• Title (english): Age structure and growth of bivalve Unio crassus in different environmental conditions
• Author: Niko Bujas
• Mentor: Melita Peharda Uljević (mentor)
• Mentor: Jasna Lajtner (komentor)
• Committee member: Jasna Lajtner (predsjednik povjerenstva)
• Committee member: Sandra Hudina (član povjerenstva)
• Committee member: Zoran Marčić (član povjerenstva)
• Committee member: Ivana Maguire (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2023-09-25, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Cilj istraživanja bio je usporediti dobnu strukturu i morfometrijske značajke dviju populacija
školjkaša Unio crassus na referentnoj i onečišćenoj postaji na rijeci Mrežnici te dobivene rezultate
usporediti s onima iz drugih dijelova Europe. Uzorkovanje školjkaša obavljeno je 7. srpnja 2020.
godine. Sa svakog lokaliteta prikupljeno je 30 jedinki kojima je određena starost i dinamika rasta
analizom unutrašnjih linija rasta primjenom acetatnih preslika. Dužinski raspon ljuštura s
referentne postaje iznosio je 4,5 - 5,6 cm, a na onečišćenoj postaji 5,2 - 6,1 cm. Procijenjena starost
analiziranim jedinkama s referentne postaje varirao je od 10 do 29 godina s prosjekom od 21,4 ±
4,2 godine, dok je na onečišćenoj postaji procijenjena starost od 10 do 22 godine s prosjekom od
15,6 ± 3,7 godina. Modificiranim von Bertalanffy-jevim jednadžbama prikazane su dinamike rasta
školjkaša pokazujući brži rast jedinki onečišćene postaje. Izrađena kronologija rasta za obje
istraživane populacije ukazala je na jednu karakterističnu godinu sa širokim prstenom rasta koja
kronološki odgovara 2015. godini. Usporedbom kronologije rasta i dostupnih podataka o okolišu
nije utvrđena jasna povezanost.

Abstract (english)

The aim of this study was to compare age structure and morphometric features of two populations
of bivalve Unio crassus at the reference and polluted station on Mrežnica river, and compare the
obtained results with those from other parts of Europe. Sampling of bivalves was carried out on
July 7th, 2020. From each locality, 30 individuals were collected. Age and growth dynamics were
determined by analyzing internal growth lines in acetate peels. The length range of shells from the
reference station was 4.5 - 5.6 cm, while at the polluted station it was 5,2 - 6,1 cm. The estimated
age of the analyzed individuals from the reference station varied from 10 to 29 years with an
average of 21,4 ± 4,2 years, while the estimated age at the polluted station was from 10 to 22 with
an average of 15,6 ± 3,7 years. The modified von Bertalanffy equations show the dynamics of shell
growth, showing faster shell growth at the polluted station. A chronology was made for both
researched locations and they had one characteristic year with a wide growth ring that
chronologically corresponds to 2015. By comparing the chronology and the available
environmental data, there was no clear correlation.

• Keywords: starost; sklerokronologija; morfometrija; ljušture; onečišćenje
• Keywords (english): age; sclerochronology; morphometry; shells; pollution
• Language: croatian
• URN:NBN: urn:nbn:hr:217:163238
• Project: Number: IP-2019-04-2636; Title: Biomolekule koje vežu metale i zdravstveni poremećaji kod slatkovodnih organizama izloženih industrijskom otpadu; Title: Metal-binding biomolecules and health disturbances of freshwater organisms exposed to industrial wastes; Acronym: METABIOM; Leader: Zrinka Dragun; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Project: Number: IP-2019-04-8542; Title: Školjkaši: Arhiva okolišnih promjena u obalnim morskim ekosustavima; Title: Bivalves: Archives of environmental Change in the coastal Marine Ecosystems; Acronym: BivACME; Leader: Melita Peharda Uljević; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• 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: Embargoed access; Embargo expiration date: 2025-09-25
• Created on: 2023-10-25 08:23:18