Reproduktivni ciklus invazivnog mramornog raka Procambarus fallax (Hagen, 1870) f. virginalis u jezeru Šoderica

master's thesis

• Title (english): Reproductive cycle of the invasive marbled crayfish Procambarus fallax (Hagen, 1870) f.virginalis in the Šoderica Lake
• Author: Marija Cvitanić
• Mentor: Ivana Maguire (mentor)
• Committee member: Ivana Maguire (predsjednik povjerenstva)
• Committee member: Božena Mitić (član povjerenstva)
• Committee member: Ana Galov (član povjerenstva)
• Committee member: Jasna Lajtner (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2017-01-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Mramorni rak (Procambarus fallax f. virginalis) je relativno nova invazivna vrsta slatkovodnog raka u Europi. Potječe iz Sjeverne Amerike i prijenosnik je uzročnika račje kuge (Aphanomyces astaci). Smatra se da je neodgovorno ponašanje u akvaristici bilo glavni put unošenja ove vrste u europske slatkovodne ekosustave. Do danas je mramorni rak zabilježen u prirodi u Njemačkoj, Slovačkoj, Italiji, Nizozemskoj, Mađarskoj i Švedskoj. Uspostavljena populacija mramornog raka nedavno je otkrivena u Hrvatskoj (2013.), u jezeru Šoderica nedaleko Koprivnice. Kako je biologija i ekologija ove vrste još uvijek nedovoljno poznata, s obzirom da je riječ o vrsti s tek nedavno uspostavljenim populacijama u prirodi, cilj ovog istraživanja bio je proučiti uzrasnu strukturu populacije mramornog raka u jezeru Šoderica, reproduktivni ciklus vrste analizom potencijalnog i realiziranog fekunditeta, te istražiti promjene tjelesne i fiziološke kondicije jedinki (korištenjem organosomatskih indeksa kondicije) i njihovu povezanost s reproduktivnim ciklusom. Glavna karakteristika ove vrste je isključivo partenogenetsko razmnožavanje stoga je istraživanje fekunditeta neophodno za procjene brzine rasta uspostavljenih populacija, te utjecaja fekunditeta na invazivni uspjeh mramornog raka.

Abstract (english)

Marbled crayfish (Procambarus fallax f. virginalis) is a relatively new invasive crayfish species in Europe. It originates from North America and it is carrier of the crayfish plague pathogen (Aphanomyces astaci). It is believed that the irresponsible handling of this species by the aquarium hobbyists was the main way to enter European freshwater ecosystems. To date, the marbled crayfish was observed in nature in Germany, Slovakia, Italy, Hungary, the Netherlands and Sweden. An established population of marbled crayfish was discovered recently (in 2013) in Croatia , in the Šoderica Lake near Koprivnica. As the marbled crayfish is relatively new species, biology and ecology of this species is still insufficiently known. The aim of this study was to examine the size structure of the marbled crayfish population in the Šoderica Lake, to analyse reproductive cycle with a focus on the potential and realized fecundity, and to explore the changes of physical and physiological condition of animals (using somatic condition indices) and their relation to the reproductive cycle. The main characteristic of this species is exclusively parthenogenetic reproduction. Therefore, fecundity research is necessary to estimate the growth rate of established populations and to observe how fecundity contributes to invasive success of the marbled crayfish.

• Keywords: mramorni rak; organosomatski indeksi kondicije; potencijalni i realizirani fekunditet
• Keywords (english): marbled crayfish; somatic indicies of condition; potential and realized fecundity
• Language: croatian
• URN:NBN: urn:nbn:hr:217:135037
• 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: Open access
• Created on: 2017-05-22 10:36:44