Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern Mongolia
The diet of two sympatric owl species, the long-eared owl ( Asio otus ) and the little owl ( Athene noctua ) was investigated in an arid area of southern Mongolia using pellet analysis. In total 334 pellets of long-eared owl and 52 pellets of little owl were analysed, revealing...
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doaj-54aeb5b9b02349bfa39fe34daea202f22020-11-25T01:49:36ZengNational University of MongoliaMongolian Journal of Biological Sciences1684-39082225-49942005-06-0131313710.22353/mjbs.2005.03.05Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern MongoliaDawn M. Scott0Karen Gladwin1Nigel Barton2Biology Division, University of Brighton, Cockcroft Building, Moulsecoomb, Brighton, East Sussex, BN2 4GJ, UKBiology Division, University of Brighton, Cockcroft Building, Moulsecoomb, Brighton, East Sussex, BN2 4GJ, UKBiology Division, University of Brighton, Cockcroft Building, Moulsecoomb, Brighton, East Sussex, BN2 4GJ, UKThe diet of two sympatric owl species, the long-eared owl ( Asio otus ) and the little owl ( Athene noctua ) was investigated in an arid area of southern Mongolia using pellet analysis. In total 334 pellets of long-eared owl and 52 pellets of little owl were analysed, revealing the presence of five small mammal species (Dipodidae, three Muridae and one Soricidae), small birds and invertebrate fragments. Accumulative composition plots indicated a batch size of 35 - 60 pellets was sufficient to reveal representative diet composition. Small mammals comprised the largest component of the diet of long- eared owls with four species recorded, Phodopus was the most frequently occurring (85 %), followed by Meriones (33 %). Bird and invertebrate remains were also found in long-eared owl pellets but comprised less than 2 %. In contrast, invertebrates were the highest occurring component of the diet of little owls (35 %), with small mammals occurring in only 40 % of pellets. Meriones was the most frequently recorded small mammal in little owl pellets (23 %) and contributed the greatest in terms of overall rodent biomass. There was a highly statistically significant difference in the diet of the two species (÷ 2 = 2043, d.f. = 4, P < 0.001). Levin’s measure of niche breadth was greater for little owls (0.71) than long-eared owls (0.51), but overall the two species had low niche overlap using Levin’s index (0.22). These results are discussed in relation to previous findings of these two species.http://mjbs.num.edu.mn/uploads/files/MJBS%20Volume%203%20Number%201%20June%202005/pdf/mjbs003-01-05.pdfdesertdietlittle owllong-eared owlMongolia |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dawn M. Scott Karen Gladwin Nigel Barton |
spellingShingle |
Dawn M. Scott Karen Gladwin Nigel Barton Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern Mongolia Mongolian Journal of Biological Sciences desert diet little owl long-eared owl Mongolia |
author_facet |
Dawn M. Scott Karen Gladwin Nigel Barton |
author_sort |
Dawn M. Scott |
title |
Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern Mongolia |
title_short |
Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern Mongolia |
title_full |
Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern Mongolia |
title_fullStr |
Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern Mongolia |
title_full_unstemmed |
Comparison of the Diet of Two Desert-living Owls, the Long-eared Owl ( Asio otus ) and Little Owl ( Athene noctua ) from Southern Mongolia |
title_sort |
comparison of the diet of two desert-living owls, the long-eared owl ( asio otus ) and little owl ( athene noctua ) from southern mongolia |
publisher |
National University of Mongolia |
series |
Mongolian Journal of Biological Sciences |
issn |
1684-3908 2225-4994 |
publishDate |
2005-06-01 |
description |
The diet of two sympatric owl species, the long-eared owl (
Asio otus
) and the little owl (
Athene
noctua
) was investigated in an arid area of southern Mongolia using pellet analysis. In total 334 pellets
of long-eared owl and 52 pellets of little owl were analysed, revealing the presence of five small mammal
species (Dipodidae, three Muridae and one Soricidae), small birds and invertebrate fragments.
Accumulative composition plots indicated a batch size of 35 - 60 pellets was sufficient to reveal
representative diet composition. Small mammals comprised the largest component of the diet of long-
eared owls with four species recorded,
Phodopus
was the most frequently occurring (85 %), followed by
Meriones
(33 %). Bird and invertebrate remains were also found in long-eared owl pellets but comprised
less than 2 %. In contrast, invertebrates were the highest occurring component of the diet of little owls (35
%), with small mammals occurring in only 40 % of pellets.
Meriones
was the most frequently recorded
small mammal in little owl pellets (23 %) and contributed the greatest in terms of overall rodent biomass.
There was a highly statistically significant difference in
the diet of the two species (÷
2
= 2043, d.f. = 4, P
< 0.001). Levin’s measure of niche breadth was greater for little owls (0.71) than long-eared owls (0.51),
but overall the two species had low niche overlap using Levin’s index (0.22). These results are discussed
in relation to previous findings of these two species. |
topic |
desert diet little owl long-eared owl Mongolia |
url |
http://mjbs.num.edu.mn/uploads/files/MJBS%20Volume%203%20Number%201%20June%202005/pdf/mjbs003-01-05.pdf |
work_keys_str_mv |
AT dawnmscott comparisonofthedietoftwodesertlivingowlsthelongearedowlasiootusandlittleowlathenenoctuafromsouthernmongolia AT karengladwin comparisonofthedietoftwodesertlivingowlsthelongearedowlasiootusandlittleowlathenenoctuafromsouthernmongolia AT nigelbarton comparisonofthedietoftwodesertlivingowlsthelongearedowlasiootusandlittleowlathenenoctuafromsouthernmongolia |
_version_ |
1725006273370390528 |