Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods
Abstract The author evaluates his own data on the food of the Eurasian eagle-owl ( Bubo bubo ) in Slovakia using material he collected between 1975 and 2020. A total of 105,543 food items were identified in 254 samples taken at 136 localities. Mammals had the highest representation (Mammalia, 65 spe...
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2021
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crdegruyter:10.2478/srj-2021-0002 2024-05-19T07:39:07+00:00 Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods Obuch, Ján 2021 http://dx.doi.org/10.2478/srj-2021-0002 https://www.sciendo.com/pdf/10.2478/srj-2021-0002 en eng Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/4.0 Raptor Journal volume 15, issue 1, page 17-55 ISSN 2644-5247 journal-article 2021 crdegruyter https://doi.org/10.2478/srj-2021-0002 2024-05-02T06:52:08Z Abstract The author evaluates his own data on the food of the Eurasian eagle-owl ( Bubo bubo ) in Slovakia using material he collected between 1975 and 2020. A total of 105,543 food items were identified in 254 samples taken at 136 localities. Mammals had the highest representation (Mammalia, 65 species, 58.4%), and the species composition of birds was diverse (Aves, minimally 140 species, 8.5%), but the common frog ( Rana temporaria , 32.0%), from the lower vertebrates, is represented more abundantly. Invertebrates (Evertebrata, 0.1%) occurred in food residues only occasionally. The bulk of the samples were collected from eagle-owl nests. The samples were divided into three time periods (A–C), which differ in the manner of human land-use management: A up to the 1950s, with a smaller area of field plots and more extensive grazing in the uplands; B from the 1950s to the 1980s, during the Socialist period, with the concentration of agricultural production in large units; C the last 30 years, 1990 to 2020, with the gradual break-up of collective land management. The first period (A) is characterised by a strong dominance of frogs, particularly the European brown frog R. temporaria (44.6%), and a large share of small mammal species of the family Muridae (genera Apodemus and Mus ). During the time of Socialism (B), eagle-owls adapted to hunting larger species of mammals and birds, and the share of frogs in their food fell by half ( R. temporaria , 23.3%). With the decline in livestock production after 1990 (period C), the species diversity of birds increased: aquatic species and raptors in particular are on the rise. Successive overgrowth of pastures in the submontane zone is reducing the hunting territories of eagle-owls. The dominance of the common vole ( Microtus arvalis ) in their diet has gradually increased from period A (26.8%) to period C (37.3%). Data from eleven areas around Slovakia are evaluated separately for the three time periods. In period A, the highest proportion of frogs was in the Liptov region ( ... Article in Journal/Newspaper Common vole eurasian eagle-owl Microtus arvalis De Gruyter Raptor Journal 15 1 17 55 |
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crdegruyter |
language |
English |
description |
Abstract The author evaluates his own data on the food of the Eurasian eagle-owl ( Bubo bubo ) in Slovakia using material he collected between 1975 and 2020. A total of 105,543 food items were identified in 254 samples taken at 136 localities. Mammals had the highest representation (Mammalia, 65 species, 58.4%), and the species composition of birds was diverse (Aves, minimally 140 species, 8.5%), but the common frog ( Rana temporaria , 32.0%), from the lower vertebrates, is represented more abundantly. Invertebrates (Evertebrata, 0.1%) occurred in food residues only occasionally. The bulk of the samples were collected from eagle-owl nests. The samples were divided into three time periods (A–C), which differ in the manner of human land-use management: A up to the 1950s, with a smaller area of field plots and more extensive grazing in the uplands; B from the 1950s to the 1980s, during the Socialist period, with the concentration of agricultural production in large units; C the last 30 years, 1990 to 2020, with the gradual break-up of collective land management. The first period (A) is characterised by a strong dominance of frogs, particularly the European brown frog R. temporaria (44.6%), and a large share of small mammal species of the family Muridae (genera Apodemus and Mus ). During the time of Socialism (B), eagle-owls adapted to hunting larger species of mammals and birds, and the share of frogs in their food fell by half ( R. temporaria , 23.3%). With the decline in livestock production after 1990 (period C), the species diversity of birds increased: aquatic species and raptors in particular are on the rise. Successive overgrowth of pastures in the submontane zone is reducing the hunting territories of eagle-owls. The dominance of the common vole ( Microtus arvalis ) in their diet has gradually increased from period A (26.8%) to period C (37.3%). Data from eleven areas around Slovakia are evaluated separately for the three time periods. In period A, the highest proportion of frogs was in the Liptov region ( ... |
format |
Article in Journal/Newspaper |
author |
Obuch, Ján |
spellingShingle |
Obuch, Ján Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods |
author_facet |
Obuch, Ján |
author_sort |
Obuch, Ján |
title |
Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods |
title_short |
Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods |
title_full |
Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods |
title_fullStr |
Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods |
title_full_unstemmed |
Spatial and temporal changes in the diet composition of the Eurasian eagle-owl ( Bubo bubo) in Slovakia comparing three historical periods |
title_sort |
spatial and temporal changes in the diet composition of the eurasian eagle-owl ( bubo bubo) in slovakia comparing three historical periods |
publisher |
Walter de Gruyter GmbH |
publishDate |
2021 |
url |
http://dx.doi.org/10.2478/srj-2021-0002 https://www.sciendo.com/pdf/10.2478/srj-2021-0002 |
genre |
Common vole eurasian eagle-owl Microtus arvalis |
genre_facet |
Common vole eurasian eagle-owl Microtus arvalis |
op_source |
Raptor Journal volume 15, issue 1, page 17-55 ISSN 2644-5247 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.2478/srj-2021-0002 |
container_title |
Raptor Journal |
container_volume |
15 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
55 |
_version_ |
1799478638873149440 |