Usporedba morfoloških značajki populacija vodenjaka u dvije bare s različitim ekološkim uvjetima

master's thesis

• Title (english): Morphological comparison of newt populations in two ponds with different ecological conditions
• Author: Karla Đinđić
• Mentor: Zoran Marčić (mentor)
• Committee member: Zoran Marčić (predsjednik povjerenstva)
• Committee member: Davor Zanella (član povjerenstva)
• Committee member: Duje Lisičić (član povjerenstva)
• Committee member: Petar Kružić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2024-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Ovim istraživanjem analiziraju se ekološke razlike između odabranih lokaliteta (Bare 1 i Bare
2) i kako te razlike utječu na uzorkovane populacije vodenjaka. Vodenjake sam uzorkovala
elektroribolovom (jedinke velikog vodenjaka isključivo s mrežicom) te im bilježila morfološke
značajke. Usporedila sam dvije populacije vodenjaka iz Bare 1 i Bare 2. Bare su ekološki slične, a
najveća je razlika prisustvo stranih vrsta riba. U Bari 2, u kojoj su prisutne strane vrste riba, manja
je gustoća jedinki i raznolikost vrsta. U Bari 1 su prisutne sve tri očekivane vrste vodenjaka (mali
vodenjak, veliki vodenjak i planinski vodenjak), a u Bari 2, samo dvije vrste vodenjaka (mali
vodenjak i planinski vodenjak). Statistički značajna razlika u totalnoj dužini tijela (TL) zabilježena
je kod mužjaka i ženki malog vodenjaka i velikog vodenjaka iz Bare 1. Mužjaci i ženke malog
vodenjaka iz Bare 1 imaju veću totalnu dužini tijela od jedinki iste vrste iz Bare 2. Statistički
značajna razlika u omjeru spolova zabilježena je kod mužjaka i ženki velikog vodenjaka iz Bare 1.
Analiza glavnih komponenata (PCA) nije pokazala značajno razdvajanje među vrstama, spolovima
i populacijama vodenjaka između odabranih lokaliteta. Strane vrste riba koje dijele isti vodeni
habitat s vodenjacima negativno na njih utječu jer konkuriraju za hranu i predatori su jaja, ličinki i
odraslih jedinki vodenjaka. Elektroribolovom sam uklonila 16 karasa i 103 babuške. Potrebno je
aktivno sudjelovati u kontroli invazivnih vrsta riba kako bi se sačuvale populacije vodenjaka.

Abstract (english)

This research analyzes the ecological differences between selected sites (Pond 1 and Pond 2)
and how these differences affect the sampled populations of newts. Newts were sampled using
electrofishing (only individuals of great crested newts with a net) and their morphological
characteristics were recorded. I compared the two populations of newts from Pond 1 and Pond 2.
The ponds are ecologically similar, with the main difference being the presence of non-native fish
species. In Pond 2, where non-native fish species are present, there is lower density of individuals
and species diversity. In Pond 1, all three expected species of newts (smooth newt, great crested
newt, and alpine newt) are present, while in Pond 2, only two species of newts (smooth newt and
alpine newt) are found. A statistically significant difference in total body length (TL) was
observed in males and females of smooth newts and great crested newts from Pond 1. Males and
females of smooth newts from Pond 1 have larger total body lengths than individuals of the same
species from Pond 2. A statistically significant difference in sex ratio was recorded in males and
females of great crested newts from Pond 1. Principal component analysis (PCA) did not show
significant separation among species, sexes, and populations of newts between the selected sites.
Non-native fish species sharing the same aquatic habitat with newts negatively affect them by
competing for food and preying on the eggs, larvae, and adult newts. I removed 16 carp and 103
goldfish using electrofishing. Active participation in controlling invasive fish species is necessary
to preserve newt populations.

• Keywords: Lissotriton vulgaris; Ichtiosaura alpestris; Triturus carnifex; usporedba populacija vodenjaka
• Keywords (english): Lissotriton vulgaris; Ichtiosaura alpestris; Triturus carnifex; comparison of populations of newts
• Language: croatian
• URN:NBN: urn:nbn:hr:217:551841
• Study programme: Title: Ecology and Nature Preservation-University graduate programme; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra ekologije i zaštite prirode (sveučilišni/a magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-13 11:26:21