Distribution and ecological characteristics of Potamogeton L. species in the rivers of the Pannonian ecoregion in Croatia

master's thesis

• Title (croatian): Rasprostranjenost i ekološke značajke roda Potamogeton L. u tekućicama Panonske ekoregije Hrvatske
• Author: Nikola Geršak
• Mentor: Antun Alegro (mentor)
• Committee member: Antun Alegro (predsjednik povjerenstva)
• Committee member: Sara Essert (član povjerenstva)
• Committee member: Ivan Čanjevac (član povjerenstva)
• Committee member: Hana Fajković (član povjerenstva)
• Committee member: Luka Valožić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2021-12-14, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

This thesis gives an insight of ecological characteristics of pondweeds (Potamogeton L.) in the
rivers in the Pannonian ecoregion of Croatia. Data on distribution of species and their abundances
were collected on 166 sample sites in the period 2016-2020, as well as physicochemical parameters
of water. The data used in the paper was processed partly in the R programming language, partly
in QGIS and in the Canoco 5 and Juice 7 programs. Statistical multivariate methods were used in
the paper: CCA, DCA, GAM and TWINSPAN. Physicochemical parameters of water related to
pondweed species sites show high levels of trophy. Of the nine species mentioned in the paper, 3
species showed the highest incidence but also tolerance to eutrophic conditions. These are P.
nodosus, the species that was present in all species of water bodies with the highest incidence, and
P. crispus and P. pectinatus. These species can serve as bioindicators of eutrophicated water. Other
species showed lower incidence, but also lower tolerance to eutrophication. The species P. lucens
proved to be the most sensitive to eutrophication, which can also serve as an indicator of better
water quality.

Abstract (croatian)

Ovaj rad donosi uvid u rasprostranjenost i ekološke karakteristike mrijesnjaka (Potamogeton L.)
u rijekama Panonske eko-regije Hrvatske. Podaci o rasprostranjenosti vrsta i njihovoj brojnosti, te
fizikalno-kemijski parametri vode prikupljeni su na 166 postaja u razdoblju 2016.-2020. Podaci
korišteni u radu su dijelom obrađeni u programskom jeziku R, dijelom u QGIS-u te u programima
Canoco 5 i Juice 7. U radu su se koristile statističke multivarijantne metode: CCA, DCA, GAM i
TWINSPAN. Fizikalno-kemijski parametri vode vezani za nalazišta vrsta mrijesnjaka pokazuju
visoke razine trofije. Od devet vrsta koje se spominju u radu, 3 vrste su pokazale najveću
pojavnost, ali i toleranciju na eutrofne uvjete. To su P. nodosus, vrsta koja je bila zastupljena u
svim vrstama vodnih tijela s najvećom pojavnošću, te P. crispus i P. pectinatus. Ove vrste mogu
poslužiti kao bioindikatori eutrofne vode. Druge vrste su pokazale manju pojavnost, ali i manju
toleranciju na eutrofikaciju. Najosjetljivijom na eutrofikaciju se pokazala vrsta P. lucens koja
može poslužiti i kao indikator bolje kvalitete vode.

• Keywords: : Pondweed; Statistical analysis; Sava-Drava interfluve; Rstudio; PCA; CCA; GAM
• Keywords (croatian): Mrijesnjak; Statistička analiza; Savsko-Dravsko međuriječje; Rstudio; PCA; CCA; GAM
• Language: croatian
• URN:NBN: urn:nbn:hr:217:999020
• 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: 2021-12-15 13:53:42