Vidra (Lutra lutra L.) v reki Ščavnici : diplomsko delo - univerzitetni študij

Stolnik, Vojko (author), Adamič, Miha (mentor), Hladnik, David (co-mentor)

V reki Ščavnici je bil med 6. februarjem in 3. majem leta 2006 opravljen pregled prisotnosti vidre (Lutra lutra) . Ščavnica je reguliran desni pritok reke Mure (56 km). Po regulaciji vidra v Ščavnici ni bila več opažena. Zanimalo me je, ali je vidra tukaj stalno prisotna ali le na občasnih prehodih; ali vegetacija na brežinah (0 do 5 m od roba struge) in v zaledju (5do 50 m od roba struge) vpliva na pojavljanje vidre; kakšen vpliv ima bližina človeških bivališč; kakšen vpliv imata prisotnost zavetišč po vzoru Projekta Otter Haven (OHP) in količina rib. Prisotnost vidrinih iztrebkov in sledi je bila preverjana pod mostovi. Število iztrebkov je bilo upoštevano kotodraz vidrine aktivnosti. Raziskava je potrdila, da je vidra na tem območjustalno prisotna. Znaki prisotnosti so bili najdeni na vseh 17-ih pregledih. Na število iztrebkov sta najbolj vplivali vegetacija na brežinah inprisotnost zavetišč po vzoru OHP. Največ iztrebkov je bilo najdenih na točkah, kjer so bile brežine gosto in delno zaraščene ter na območju zavetišč.Območje delno zaraščenih brežin in območje zavetišč se v veliki meri prekrivata. Količina gozda v zaledju in bližina človeških bivališč nista vplivali na število iztrebkov. Presenetljivo je, da je bilo največ slednjih najdenih na točkah z najmanjšo količino rib, kar je verjetno povezano z gosto obrežno vegetacijo ob teh točkah.

• Language: Slovenian
• Keywords: vidra, Lutra lutra, Ščavnica
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [V. Stolnik]
• Year: 2009
• Number of pages: VII, 75 str.
• PID: 20.500.12556/RUL-15806
• UDC: 630*14(497.4)(282.24 Mura)(282.24 Ščavnica)(043.2)=163.6
• COBISS.SI-ID: 2451366
• Publication date in RUL: 11.07.2014

Secondary language

• Language: Unknown

Abstract

The Ščavnica river was examined for the presence of Eurasian otter (Lutra lutra) during 6th February and 3rd May 2006. After stream regulation the otter presence has not been confirmed any more. The main question is, whether the otter is constantly present in the area or it is just an occasional visitor. Other questions are how riparian (0-5 m from the riverbed), rear (5-50 m from the riverbed) vegetation, proximity of human settlements, availability of shelters, based on the model of the Otter Haven Project (OHP),respectively, influence the otter presence. The area was searched for otter excrements (spraints) and footprints under the bridges. The number of spraints correlated with otter activity. Permanent otter presence has been confirmed, since positive signs were found on all 17 surveys. Factors affecting number of spraint are riparian vegetation and OHP-style shelters. Most spraints were found on localities with dense vegetation and in shelter areas. Vegetation and shelter areas partially overlap. There was no correlation between hinterland forest vegetation and human settlements on one side and the number of spraints on the other. Surprisingly, the majority of spraints were found along the sections with the smallest fish density, which could be explained with the dense vegetation along these sections.