Effects of food provisioning and habitat management on spatial behaviour of Little Owls during the breeding season

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081766%3A_____%2F16%3A00460070" target="_blank" >RIV/68081766:_____/16:00460070 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/16:43890905

Výsledek na webu

<a href="http://www.ornisfennica.org/pdf/early/Jacobsen.pdf" target="_blank" >http://www.ornisfennica.org/pdf/early/Jacobsen.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Effects of food provisioning and habitat management on spatial behaviour of Little Owls during the breeding season

Popis výsledku v původním jazyce

The population of Little Owls in Denmark is close to extinction. The main cause is food limitation during the breeding season. Efforts to improve breeding success include providing breeding pairs with supplementary food and attempts to improve foraging habitats by creating short grass areas near the nests. In addition to increasing the reproductive output, feeding and habitatmanagementmay cause parents towork less hard improving their future reproductive value. We studied working efforts of five radio-tagged Little Owl pairs in years of absence and presence of food provisioning, and/or access to short sward vegetation areas near to the nest.We quantifiedmovement as theminimumflight distance hour–1 (MFD), using themean distance from the nest (DN) as a supplementary index. Under unmanipulated conditions, males had higher MFD and DN than females. If providednwith food and/or areas with short sward vegetation, males but not females reduced their MFD and DN significantly. If MFD was adjusted for DN (the two measures correlated positively), both sexes reduced their DN-adjusted MFD as response to food provisioning but not to habitat provisioning. Food provisioning therefore had similar proximate effects on the foraging effort ofmales and females, whereas provisioning of short sward habitats had an indirect effect onmale but not female MFD, because of decreased commuting distances between nest and foraging sites. The results indicate that food provisioning not only leads to increased reproductive output in an endangered raptor, but also to decreased working effort, which in turn may improve adult survival.

Název v anglickém jazyce

Effects of food provisioning and habitat management on spatial behaviour of Little Owls during the breeding season

Popis výsledku anglicky

The population of Little Owls in Denmark is close to extinction. The main cause is food limitation during the breeding season. Efforts to improve breeding success include providing breeding pairs with supplementary food and attempts to improve foraging habitats by creating short grass areas near the nests. In addition to increasing the reproductive output, feeding and habitatmanagementmay cause parents towork less hard improving their future reproductive value. We studied working efforts of five radio-tagged Little Owl pairs in years of absence and presence of food provisioning, and/or access to short sward vegetation areas near to the nest.We quantifiedmovement as theminimumflight distance hour–1 (MFD), using themean distance from the nest (DN) as a supplementary index. Under unmanipulated conditions, males had higher MFD and DN than females. If providednwith food and/or areas with short sward vegetation, males but not females reduced their MFD and DN significantly. If MFD was adjusted for DN (the two measures correlated positively), both sexes reduced their DN-adjusted MFD as response to food provisioning but not to habitat provisioning. Food provisioning therefore had similar proximate effects on the foraging effort ofmales and females, whereas provisioning of short sward habitats had an indirect effect onmale but not female MFD, because of decreased commuting distances between nest and foraging sites. The results indicate that food provisioning not only leads to increased reproductive output in an endangered raptor, but also to decreased working effort, which in turn may improve adult survival.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

EG - Zoologie

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Ornis Fennica

ISSN

0030-5685

e-ISSN

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Svazek periodika

93

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

FI - Finská republika

Počet stran výsledku

9

Strana od-do

121-129

Kód UT WoS článku

000378757700005

EID výsledku v databázi Scopus

2-s2.0-84976444926