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The impact of a catastrophic flood on species and size composition of the diet of fish-eating birds
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SYSNO ASEP 0538614 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The impact of a catastrophic flood on species and size composition of the diet of fish-eating birds Author(s) Hadravová, A. (CZ)
Čech, P. (CZ)
Čech, Martin (BC-A) RID, ORCIDNumber of authors 3 Article number 103608 Source Title Acta Oecologica-International Journal of Ecology. - : Elsevier - ISSN 1146-609X
Roč. 108, č. 10 (2020), s. 1-9Number of pages 9 s. Language eng - English Country FR - France Keywords Common kingfisher (Alcedo atthis) ; Diagnostic bones ; Diet composition ; Regurgitated pellets ; Nesting sediment ; Floods Subject RIV EG - Zoology OECD category Zoology Method of publishing Limited access Institutional support BC-A - RVO:60077344 UT WOS 000577148600003 EID SCOPUS 85091228202 DOI 10.1016/j.actao.2020.103608 Annotation Floods in June 2013 affected significant portions of the Czech Republic (total damages amounted similar to 600 millions of euro). This study examines the impact of catastrophic flood on the species composition and size of fish prey in the diet of the common kingfisher (Alcedo atthis), a fish-eating bird, nesting and hunting on Botic stream (Prague, Czech Republic) in 2013. Hundred and forty years water (flow 74.5 m(3) s(-1)) caused considerable damage to property and it is likely that the character and size composition of biota, especially fish, changed. This should be reflected naturally in the diet of resident kingfishers. The diet of kingfishers before and after the flood were investigated from the mass of regurgitated pellets, which were collected from the nest tunnel and chamber immediately after the successful breeding period before and after the flood event. Before the flood (normal situation, flow 0.4-1.5 m(3) s(-1)), the average length of fish caught was 6.5 cm L-T (total length), average weight 2.6 g, and the index of food diversity was 1.58. After the flood, the average length of fish caught was 7.5 cm L-T, weight 4.1 g, and the index of the food diversity was 1.36. It was evident that after the flood kingfishers were forced to hunt significantly larger prey. Six fish species (Gobio gobio, Squalius cephalus, Perca fiuviatilis, Scardinius erythrophthalmus, Rutilus rutilus, Pseudorasbora parva) which were hunted both before and after the flood composed 96.5 and 99.8% of the catch (by numbers). Surprisingly, the impact of floods may not always be reflected in the species composition of the diet of fish-eating birds, it mostly depends on the presence of fish broadly occurring in the stream, natural stability of the fish stock and on the composition of the fish assemblage in the upstream catchment area. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2021 Electronic address https://doi.org/10.1016/j.actao.2020.103608
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