Prehrana vidre (Lutra lutra L.) u središnjoj Hrvatskoj

master's thesis

• Title (english): Diet of otter (Lutra lutra L.) in central Croatia
• Author: Tena Šarčević
• Mentor: Marko Ćaleta (mentor)
• Mentor: Milorad Mrakovčić (mentor)
• Committee member: Milorad Mrakovčić (predsjednik povjerenstva)
• Committee member: Marko Ćaleta (član povjerenstva)
• Committee member: Antun Alegro (član povjerenstva)
• Committee member: Davor Zanella (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2012-12-20, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Vidra (Lutra lutra L.) je srednje veliki sisavac iz porodice kuna (Mustelidae). Načinom života je vezana za vodena staništa. U tim je staništima glavni predator i stoga ima ključnu ulogu u prehrambenom lancu. Jedan od ključnih faktora koji određuje da li je stanište pogodno za vidru je dostupnost plijena. Cilj ovog istraživanja bio je odrediti raznolikost prehrane vidre i preferirani tip plijena, analizom izmeta, na različitim tipovima staništa. Područje istraživanja je 10000 km2 UTM polja, na području središnje Hrvatske. Izmeti su prikupljeni sa pet tipova staništa: potoka, rijeka, kanala, ribnjaka, jezera. Istraživanje je provedeno u proljeće i rano ljeto te je analizirano 76 uzoraka. Rezultati istraživanja pokazuju da su primaran tip plijena ribe, a sekundaran vodozemci i deseteronožni rakovi. Zastupljenost riba najveća je u jezerima, a redom se smanjuje u rijekama, kanalima pa potocima, dok vodozemci i deseteronožni rakovi pokazuju obrnuti trend zastupljenosti u prehrani. Prema rezultatima istraživanja može se zaključiti da brojnost plijena u staništima zadovoljava vidrine potrebe, ali se o raznolikosti vrsta ne mogu izvoditi zaključci.

Abstract (english)

The otter (Lutra lutra L.) is a medium sized mammal from the family Mustelidae. Its' life-style is connected to freshwater habitats. It has a role of a top predator in the food chain. One of the main factors that determine whether habitat is suitable for an otter is availability of the prey. The aim of this study was to investigate the preference and diversity of prey types in otter diet in different habitats. The main method was the analysis of otter spraints. Studied area was 10000 km2 of the UTM field in central Croatia. Spraints were collected from five different habitats: streams, rivers, channels, fish ponds, lakes. Research was conducted during spring and early summer. 76 samples were analyzed. The results show that fish is the main prey type in the otter diet and amphibians and crayfishes have secondary importance. The importance of fish in the diet declines from the lakes to rivers, channels and streams and amphibians and crayfishes negatively correlate. Results indicate that the abundance of the prey in the studied habitats is sufficient for otters' needs, but it's not possible to make conclusions about species diversity of the habitats.

• Keywords: Lutra lutra; plijen; prehrana; izmeti; potoci; rijeke; proljeće
• Keywords (english): Lutra lutra; prey; diet; spraints; streams; rivers; spring
• Language: croatian
• URN:NBN: urn:nbn:hr:217:424740
• 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: Access restricted to students and staff of home institution
• Created on: 2017-05-02 11:42:18