ORGANOSOMATIC INDICES OF INVASIVE SPECIES Procambarus fallax (Hagen, 1870) f. virginalis FROM THE ŠODERICA LAKE (KOPRIVNICA)

master's thesis

• Title: Organosomatski indeksi invazivne vrste Procambarus fallax (Hagen, 1870) f. virginalis iz jezera Šoderica (Koprivnica)
• Author: Anita Žižak
• Mentor: Ivana Maguire (mentor)
• Committee member: Ivana Maguire (predsjednik povjerenstva)
• Committee member: Božena Mitić (član povjerenstva)
• Committee member: Duje Lisičić (član povjerenstva)
• Committee member: Jasna Lajtner (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2015-11-24, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Strane invazivne vrste predstavljaju jedan od glavnih uzroka smanjenja biološke raznolikosti i degradacije ekosustava diljem svijeta. Jedan od glavnih čimbenika koji određuje invazivni uspjeh pojedinih vrsta je mogućnost brzog širenja areala. No, saznanja o mehanizmima i uvjetima potrebnim za brzo širenje još su uvijek nedostatna. Cilj ovog istraživanja bio je odrediti potencijalne prednosti invazivne vrste na primjeru mramornog raka iz jezera Šoderica. Navedeni cilj ostvarili smo istraživanjem potencijalnih razlika u kondiciji populacija mramornog raka s autohtonim vrstama. Laboratorijskim analizama organosomatskih indeksa (probavna žlijezda, spolna žlijezda, mišić) kondicije dokazali smo kako su ženke mramornog raka u boljoj kondiciji nego ženke autohtonih vrsta. Bolja kondicija spolnih žlijezda u ženki mramornog raka govori u prilog tezi da je reproduktivni potencijal invazivnih vrsta viši od reproduktivnog potencijala autohtonih vrsta. Razlike istraživanih kondicijskih indeksa između lipnja i srpnja nisu bile statistički značajne. Nisu uočene značajne histomorfološke razlike između jajnika uzorkovanih u lipnju i srpnju te su stoga ženke mramornih rakova sposobne ispuštati zrela jaja u oba istraživana mjeseca. Dobivene rezultate treba proširiti sveobuhvatnijim istraživanjima na većem broju ženki mramornih rakova tijekom duljeg vremenskog razdoblja.

Abstract (english)

Invasive alien species are one of the main causes of biodiversity loss and degradation of ecosystem services around the world. The ability of rapid range expansion is one of the key determinants of invasive species success. However, our understanding of mechanisms and drivers of rapid range expansion is still limited. The aim of this research was to analyze the potential benefits of dispersal on fitness by using invasive marble crayfish from the Šoderica Lake. We explored this issue by analyzing potential differences between marble crayfish condition in populations with native species. Results of organosomatic condition indices analyses showed that marble crayfish females are in a better condition than the females of native crayfish species. The gonad condition was significantly higher in marble crayfish what explains its high reproductive potential compared to native crayfish species. There were no differences between condition indices between June and July. Further, there were no histomorphological differences between the two studied months, so the marble crayfish females are capable to produce mature eggs throughout a longer period compared to native crayfish species. Obtained results need to be expand with comprehensive research on a larger number of marble crayfish females during a longer period of time.

• Keywords: strane invazivne vrste; mramorni rak; kondicija; organosomatski indeksi; jajnici
• Keywords (english): invasive alien species; marble crayfish; condition; organosomatic indices; gonads
• Language: croatian
• URN:NBN: urn:nbn:hr:217:810998
• Study programme: Title: Ekologija i zaštita prirode; Study programme type: sveučilišni; Study level: diplomski; 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: 2017-04-24 09:46:49