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1.
Izbira habitata pri izbranih vrstah vodnih ptičev na Račkih ribnikih
Urška Martinc, 2015, undergraduate thesis

Abstract: V letu 2011 smo v obdobju od 26. 6. 2011 do 14. 8. 2011 opravljali popise izbranih vrst vodnih ptic na Račkih ribnikih v Krajinskem parku Rački ribniki – Požeg (SV Slovenija) na Velikem ribniku, Gajiču, Malem ribniku ter na treh stranskih bazenih. Popis smo opravljali z namenom, da ugotovimo izbiro habitatov izbranih vrst vodnih ptic, številčnost vrst ter število gnezd v času opazovanja. Popisovali smo 9 vrst vodnih ptičev in sicer: labod grbec Cygnus olor, mlakarica Anas platyrhynchos, sivka Aythya ferina, kostanjevka Aytya nyroca, čopasta črnica Aythya fuligula, mali ponirek Tachybaptus ruficollis, čopasti ponirek Podiceps cristatus, zelenonoga tukalica Gallinula chloropus ter liska Fulica atra. Območje raziskave smo razdelili na pet habitatov: rogoz, plavajoče rastline, mešano (plavajoče rastline in rogoz), odprto ter obrežje. Popis smo izvedli šestnajstkrat. Popisovali smo ob različnih delih dneva. Dan smo razdelili na štiri dele. V času od 8.00 do 11.00 (zjutraj) smo popis izvedli dvakrat, od 11.00 do 14.00 (opoldan) šestkrat, od 14.00 do 17.00 (popoldan) petkrat ter od 17.00 do 20.00 (zvečer) trikrat. Ribnike in bazene smo opazovali s kopnega, s ceste, ki poteka med ribniki ter z opazovalnice, ki se nahaja na južni strani ribnika Gajič. Bazene smo pregledali v celoti. Najštevilčnejša vrsta je bila liska, najmanj smo prešteli osebkov laboda grbca. Vse osebke smo opazili v habitatu plavajoče rastline in odprto. Največ osebkov smo popisali v habitatu odprto, najmanj pa v habitatu rogoz. Opazili smo 6 gnezd, štiri so pripadala čopastemu ponirku.
Keywords: Rački ribnik, izbira habitata, vodne ptice, številčnost vrst
Published in DKUM: 22.10.2015; Views: 1787; Downloads: 106
.pdf Full text (3,19 MB)

2.
Odnosi med telesno velikostjo, razširjenostjo in gostoto gnezdečih ptic v Sloveniji
Franc Janžekovič, 2002, original scientific article

Abstract: Through the analysis of empirical data on the breeders of Slovenia, relations between their distribution, abundance and body size were being assessed. Two hypotheses were tested: 1) species with greater distribution have greater abundance than species limited to smaller geographical regions: 2) larger species have lower average abundance than smaller. The relationship between distribution and abundance of the species breeding in Slovenia was in accordance with the exponent growth, while the correlation coefficient was high and positive (R=0,75). Correlation between distribution of species and number of breeding pairs was also significant and positive (R=0,88). Larger species had smaller average abundance and therefore smaller number of breeding pairs than smaller birds. Correlation between body size and abundanceof pairs was negative (r=-0,41). The difference in abundance of pairs between species with larger and smaller body size is presumably the result of different access to natural resources (mainly food). In larger species, the same quantity of limited natural resources is distributed among smaller number of individuals, while in small body size species this quantity is distributed among greater number of birds
Keywords: biologija, zoologija, ornitologija, ptice, Aves, telesna velikost, razširjenost, številčnost, gnezdilke, Slovenija
Published in DKUM: 10.07.2015; Views: 1502; Downloads: 50
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