Hiireviu (Buteo Buteo) saagi koostise pesapaikade- ja aastatevaheline varieeruvus pesakaamera andmete põhjal
Laen...
Kuupäev
2022
Kättesaadav alates
02.09.2022
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Hiireviu (Buteo Buteo) on Eesti arvukaim röövlind. Hiireviude toitumine on mitmekesine,
kuid põhitoiduks on närilised. Varasemalt on hiireviude toitumise kohta saadud infot
peamiselt räppetompude ja saagijäänuste uurimise läbi, kuid pesakaamerate abil pole seda
laialdaselt tehtud.
Antud bakalaureusetöö eesmärk oli uurida, kas hiireviu saagi koostist mõjutab
aastatevaheline või pesadevaheline varieeruvus.
Selleks analüüsis töö autor kümne pesakaamera fotojäädvustusi, mis oli jäädvustatud
Tartumaal pesitsevatel pesadel ajavahemikus 2019-2021. Seejärel võrreldi omavahel ühe
pesa erinevate aastate saakide tulemusi ning erinevate pesade sama aasta tulemusi. Samuti
leiti, milline oli pesale toodud keskmine saakide arv ühes päevas ühe poja kohta ning kas
leidub seos saakide arvu ning poegade arvu vahel.
Töö tulemustest selgus, et hiireviude toidulaual oli erinevusi erinevatel aastatel: 2019. aastal
oli peamiseks saagiks hiireviude toidulaual närilised, 2020. aastal mängisid olulist rolli
näriliste kõrval ka päriskonnalised ning 2021. aastal domineerisid päriskonnalised ning
näriliste osakaal toidulauast oli jäänud väga väikeseks.
Võrreldes erinevate pesade toidulauda ühel aastal selgus, et sama aasta pesade saagid olid
sarnased ning pesadevahelised erinevused olid väikesed.
Töö tulemustest selgus, et päriskonnaliste osakaal hiireviude toidulaual on suurem kui
varasemad uuringud on arvanud ning mitmetel vaatlusalustel pesadel osutusid
päriskonnalised poegade põhitoiduks.
Siiski tuleks antud tööd jätkata, kogudes ning analüüsides fotojäädvustusi nendel pesadel ka
järgnevatel aastatel, et selgitada, kas näriliste domineeriv osakaal hiireviude toidulaual on
tsükliline. Lisaks töös uuritud pesadele tuleks vaatluse alla võtta veel lähedalasuvaid pesasid,
et valimit suurendada. Samuti saab töös saadud tulemusi võrrelda mõne teise piirkonna
pesade tulemustega.
The common buzzard (Buteo Buteo) is the most numerous bird of prey in Estonia. The diet of the common buzzard is diverse, but the main prey is rodents. In the past, information on the diet of buzzard has been obtained mainly through the study of pellets and the remainder of the prey, but this has not been widely done with the help of nesting cameras. The aim of this bachelor's thesis was to investigate whether the composition of the common buzzards diet is affected by the variability between years and between nests. For this purpose, the author of the work analyzed the photo recordings of ten nesting cameras, which were recorded in the nests nesting in Tartu county in the period 2019-2021. The results of the prey of the same nest in different years and the results of different nests in the same year were then compared. The average number of prey per day per chick was also found to determine whether there is a link between the number of catches and the number of chicks. The results of the work showed that there are differences in the diet of the common buzzard in different years: in 2019 the main catch was rodents, in 2020 frogs also played an important role next to rodents, and in 2021 frogs dominated and the proportion of rodents on the table had remained very small. When comparing the food table of different nests in one year, it was found that the prey of nests in the same year were similar and the differences between nests were small. In this work it was found that the proportion of frogs in the diet of buzzards is higher than previous studies have suggested, and in several of the nests under consideration, frogs turned out to be the main food for their chicks. However, this work should be continued by collecting and analyzing photographic recordings in these nests in the following years to determine whether the dominant proportion of rodents in the common buzzards diet is cyclical. In addition to the nests studied in the work, other nearby nests should be considered in order to increase the sample. The results obtained in the work can also be compared with the results of nests in another region.
The common buzzard (Buteo Buteo) is the most numerous bird of prey in Estonia. The diet of the common buzzard is diverse, but the main prey is rodents. In the past, information on the diet of buzzard has been obtained mainly through the study of pellets and the remainder of the prey, but this has not been widely done with the help of nesting cameras. The aim of this bachelor's thesis was to investigate whether the composition of the common buzzards diet is affected by the variability between years and between nests. For this purpose, the author of the work analyzed the photo recordings of ten nesting cameras, which were recorded in the nests nesting in Tartu county in the period 2019-2021. The results of the prey of the same nest in different years and the results of different nests in the same year were then compared. The average number of prey per day per chick was also found to determine whether there is a link between the number of catches and the number of chicks. The results of the work showed that there are differences in the diet of the common buzzard in different years: in 2019 the main catch was rodents, in 2020 frogs also played an important role next to rodents, and in 2021 frogs dominated and the proportion of rodents on the table had remained very small. When comparing the food table of different nests in one year, it was found that the prey of nests in the same year were similar and the differences between nests were small. In this work it was found that the proportion of frogs in the diet of buzzards is higher than previous studies have suggested, and in several of the nests under consideration, frogs turned out to be the main food for their chicks. However, this work should be continued by collecting and analyzing photographic recordings in these nests in the following years to determine whether the dominant proportion of rodents in the common buzzards diet is cyclical. In addition to the nests studied in the work, other nearby nests should be considered in order to increase the sample. The results obtained in the work can also be compared with the results of nests in another region.
Kirjeldus
Bakalaureusetöö
Loodusturismi õppekaval
Märksõnad
bakalaureusetööd, toitumine, viu, pesa