Utjecaj alohtonih deseteronožnih vrsta rakova na slatkovodne ekosustave u Hrvatskoj s posebnim osvrtom na mramornog raka (Procambarus fallax f. virginalis)

undergraduate thesis

• Title (english): Impact of the allochthonous crayfish species onto freshwater ecosystems in Croatia with specific rewiev of marbled crayfish (Procambarus fallax f. Virginalis)
• Author: Zoran Šargač
• Mentor: Ivana Maguire (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2015, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

U Hrvatskoj su trenutno prisutne 4 autohtone vrste deseteronožnih rakova (Astacus astacus, Astacus leptodactylus, Austropotamobius pallipes i Austropotamobius torrentium) te 3 invazivne vrste: Orconectes limosus, Pacifastacus leniusculus i Procambarus fallax f. virginalis. Alohtone vrste karakterizira veći fekunditet, veća agresivnost te otpornost na račju kugu koja negativno utječe na autohtone vrste koje nisu otporne na ovu bolest. Sve invazivne vrste pronađene su u kontinentalnom dijelu Hrvatske, u vodotocima crnomorskog slijeva, gdje najčešće dolaze u doticaj s vrstama Astacus astacus i Astacus leptodactylus uzrokujući smanjenje njihovih populacija. Velike populacije invazivnih vrsta rakova isto tako mogu uzrokovati nestajanje biljnih i životinjskih vrsta. Također značajni negativni utjecaj na autohtone vrste rakova ima i antropogeni pritisak (onečišćenje i degradacija staništa) na njihova staništa. Ulov vršama pokazao se kao najbolji način za regulaciju populacija invazivnih vrsta rakova u Hrvatskoj. Nedavni pronalazak mramornog raka na jezeru Šoderica predstavlja novu potencijalnu opasnost za slatkovodne ekosustave zbog sposobnosti ove vrste da se razmnožava partenogenezom.

Abstract (english)

Currently, in Croatia 4 native freshwater crayfish species are present. Those are: Astacus astacus, Astacus leptodactylus, Austropotamobius pallipes and Austropotamobius torrentium. Also presence of 3 alien invasive species is recorded: Orconectes limosus, Pacifastacus leniusculus and Procambarus fallax f. virginalis. Non-indigenous (alien) species are characterized by higher fecundity, higher aggressiveness and resistance to crayfish plague, which has negative affects onto the native species that are not resistant to this disease. All invasive species are found in the inland of Croatia, in rivers of the Black Sea basin, where they are in contact with Astacus astacus and Astacus leptodactylus causing the reduction of their population. Apart from that, abundant invasive crayfish populations can cause disappearance of other aquatic animal and plant species. Negative anthropogenic influence is also significant in the form of pollution and degradation od habitat. Removing the invasive crayfish from freshwater habitats by traps has been shown as the best way for regulation of the invasive species spreading in Croatia. Recent discovery of marbled crayfish on the lake Šoderica presents new potential threat for freshwater ecosystems because of its parthenogenetic reproduction.

• Keywords: alohtoni rakovi; mramorni rak; slatkovodni ekosustavi
• Keywords (english): allochthonous crayfish; marbled crayfish; freshwater ecosystems
• Language: croatian
• URN:NBN: urn:nbn:hr:217:662911
• Study programme: Title: Environmental Sciences; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-12-18 13:05:12