Usporedba građe mrežnice oka nadzemne i podzemne populacije kapelske svjetlice (Telestes karsticus)

master's thesis

• Title (english): Comparative histology of the retina in surface and subterranean populations of Karst dace (Telestes karsticus)
• Author: Lucia Ilijić
• Mentor: Zoran Marčić (mentor)
• Mentor: Helena Bilandžija (komentor)
• Committee member: Zoran Marčić (predsjednik povjerenstva)
• Committee member: Tvrtko Dražina (član povjerenstva)
• Committee member: Sandra Hudina (član povjerenstva)
• Committee member: Perica Mustafić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2023-02-17, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Kapelska svijetlica (Telestes karsticus Marčić & Mrakovčić, 2011) stenoendemska je vrsta
dunavskog slijeva sa stalnom nadzemnom i podzemnom populacijom u potoku i ponoru Sušik, što
ju čini potencijalno važnim modelnim organizmom za proučavanje početnih adaptivnih procesa
koji se događaju tijekom kolonizacije podzemnih staništa. Podzemne jedinke ne pokazuju očite
troglomorfne karakteristike i pretpostavlja se da je ova vrsta tek nedavno kolonizirala podzemlje.
Prethodnim istraživanjem utvrđeno je da se mrežnica oka podzemnih jedinki morfološki razlikuje
od mrežnice nadzemnih jedinki. Cilj ovog diplomskog rada bio je istražiti kako se prvi odgovor
kapelske svijetlice na izmještanje sa svjetla u mrak, ili obratno, manifestira u građi mrežnice oka.
Jedinke porijeklom iz nadzemne i podzemne populacije podijeljene su u 4 skupine te izložene
različitim eksperimentalnim svjetlosnim uvjetima u laboratoriju, u trajanju od 22 mjeseca. Po
završetku eksperimenta provedena je analiza i usporedba građe mrežnice između ispitivanih
skupina. Kod jedinki nadzemne populacije izloženih konstantnoj tami i jedinki podzemne
populacije izloženih izmjeni svjetla i mraka postoji tendencija povećanja ukupne širine i širine
pojedinih slojeva mrežnice oka.

Abstract (english)

The karst dace (Telestes karsticus Marčić & Mrakovčić, 2011) is a stenoendemic species of the
Danube basin forming two permanent populations – a surface population in the Sušik Creek and a
subterranean one in the Sušik Cave, which makes this species a potentially important model
organism for studying the initial adaptive processes that occur during cave colonization. The
species appears to have only recently colonized the cave, showing no obvious troglomorphic traits.
A previous study has established a morphological difference in the eye retina of surface and
subterranean specimens. The aim of this thesis was to investigate how the first response of karst
dace to displacement from light to dark conditions, and vice versa, is manifested in the retina.
Individuals originating from the surface and subterranean population were divided into 4 groups
and exposed to different experimental lighting conditions for 22 months, after which we performed
an analysis and comparison of the retinal structure between the groups. In individuals from the
surface population exposed to constant darkness, as well as in individuals from the subterranean
population exposed to a light-dark regime, there is a tendency of increasement in the total width of
the retina and the width of its individual layers.

• Keywords: kolonizacija špilja; modelni organizam; plastičnost
• Keywords (english): cave colonization; model organism; plasticity
• Language: croatian
• URN:NBN: urn:nbn:hr:217:060837
• 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: 2025-02-17
• Created on: 2023-02-27 09:36:24