Morfološke značajke vrste Ancylus fluviatilis O. F. Müller, 1774 (Gastropoda, Planorbidae)

master's thesis

• Title (english): Morphological characteristics of Ancylus fluviatilis O. F. Müller, 1774 (Gastropoda, Planorbidae)
• Author: Karolina Gudelj
• Mentor: Jasna Lajtner (mentor)
• Committee member: Jasna Lajtner (predsjednik povjerenstva)
• Committee member: Božena Mitić (član povjerenstva)
• Committee member: Blanka Cvetko Tešović (član povjerenstva)
• Committee member: Danijel Orešić (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2016-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Glavni cilj ovog rada bio je usporediti morfološke značajke dviju populacija slatkovodnog
puža Ancylus fluviatilis te utvrditi razlike i sličnosti u mjerenim vrijednostima. Jedna
populacija uzorkovana je u rijeci Rudi (Dalmacija) koja pripada jadranskom slijevu, a druga u
potoku Slapnica (Žumberak) koja pripada crnomorskom slijevu. Na oba lokaliteta jedinke su
ručno skupljane s kamenja i valutica na koje su bile pričvršćene. Za određivanje morfoloških
značajki vrste iz svake populacije odabrano je 110 jedinki kojima su izmjerene četiri
morfometrijske značajke kućice (duljina, visina, anteriorna širina, posteriorna širina) te je
određena suha i mokra masa jedinke. Osim toga, analizirano je i pet omjera morfoloških
značajki kućice. Deskriptivna statistika mjerenih značajki pokazala je da jedinke uzorkovane
u Rudi imaju manje kućice u usporedbi s puževima iz Slapnice. Prema rezultatima t-testa sve
morfološke značajke, omjeri visine i duljine kućice, kao i omjeri visine i anteriorne širine
kućice statistički se značajno razlikuju između dvije populacije. Visoke vrijednosti
Pearsonovog koeficijenta korelacije za sve mjerene morfometrijske značajke pokazuju da je
korelacija gotovo potpuna. Najjača linearna povezanost među mjerenim obilježjima
populacije puževa u rijeci Rudi uočena je između duljine i anteriorne širine kućice (koeficijent
determinacije linearnog regresijskog modela R² = 0,939). Za rijeku Slapnicu najjača je
linearna povezanost uočena između duljine kućice i suhe mase jedinke (R² = 0,862).

Abstract (english)

The main objective of this study was comparison of the morphological characteristics of the
two populations of freshwater snail Ancylus fluviatilis and to determine differences and
similarities between measured values. One snail population was sampled from Ruda River
(Dalmacija) which belongs to the Adriatic basin and the second population was sampled from
stream Slapnica which belongs to the basin of Black Sea. At both sites individuals were
manually collected from rocks and pebbles. To determine the morphological characteristics of
species, 110 individuals were selected from each of the two populations. For each of the
individuals, four morphometric values of the shell were measured (length, height, anterir
width, posterior width), as well as their dry and wet mass. Five morphometric ratios of shell
were also calculated. Descriptive statistics indicated that the individuals sampled from Ruda
River have smaller shells compared to snails from stream Slapnica. According to the results of
t-test, all the morphological features and ratios between shell height and shell length, as well
as ratios between shell height and shell anterior width were significantly different among two
populations. The high value of Pearson correlation coefficient for all measured morphometric
features indicated that the correlation was almost perfect. The strongest linear relationship
among the measured characteristics of the snail population in the river Ruda was observed
between the shell length and shell anterior width (coefficient of determination R² = 0,939).
For stream Slapnica the strongest linear relationship was observed between the shell length
and its dry mass (R² = 0,862).

• Keywords: Ancylidae; morfologija ljuske; mekušci; slatkovodni puževi
• Keywords (english): Ancylidae; shell morphology; molluscs; freshwater snails
• Language: croatian
• URN:NBN: urn:nbn:hr:217:534493
• Study programme: Title: Enviromental Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra struke znanosti o okolišu (magistar/magistra struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-05-03 10:28:06