Increased hunting effort buffers against vole scarcity in an urban Kestrel<i>Falco tinnunculus</i>population

Riegert, Jan; Dufek, A.; Fainová, Drahomíra; Mikeš, Václav; Fuchs, Roman

doi:10.1080/00063650709461495

Cited by 33 publications

(14 citation statements)

References 29 publications

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“…Because successful offspring desertion by female Boreal Owls (in the late nesting phase) and male-only care are positively related to food abundance (Eldegard and Sonerud 2009;Zárybnická 2009a;Korpimäki et al 2011), the responses of female owls to low male food provisioning may vary in different environments and particularly under fluctuating food conditions. Similarly, female Eurasian Kestrels Falco tinnunculus and Northern Goshawks Accipiter gentilis adjust hunting efforts and nest attendance to the abundance of their main prey (Tolonen and Korpimäki 1994;Dewey and Kennedy 2001;Riegert et al 2007). Unfortunately, we have no data to compare female-only parental care in Boreal Owls under different food availability levels.…”

Section: Discussionmentioning

confidence: 96%

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Zárybnická

Vojar

2013

Zool. Stud.

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Background: Sex-specific parental roles of most raptors allow mates to cooperate during breeding; while females incubate and brood, males provide food. If one partner fails in its parental duties, however, sex-specific parental roles can limit the ability of each sex to carry out the role normally performed by its partner. We observed the effect of male food provisioning on female parental care in Boreal Owls Aegolius funereus using cameras at 12 nests in western Finland in 2005. We compared the parental care of eight females in nests with a high male feeding rate (successful nests) with that of the females in four nests with a low or zero male feeding rate (failed nests).

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Section: Discussionmentioning

confidence: 96%

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Zárybnická

Vojar

2013

Zool. Stud.

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“…The rural population was located in a farmland northwest of Č eské Budějovice, where the kestrels mainly used the abandoned nests of magpies (Pica pica) on electric pylons. The population of kestrels in Č eské Budějovice is annually composed of a mean of 35.6 breeding pairs, with a breeding density of 1.2 pairs/km 2 (Riegert et al 2007b), while the size of the farmland population was approximately 20 pairs each year and a breeding density of 0.7 pairs/km 2 (Mikeš 2003).…”

Section: Study Area and Kestrel Populationmentioning

confidence: 99%

“…We assessed the summer availability of small mammals for both populations independently from 1997 to 2006 on kestrel hunting grounds (for details, see Mikeš 2003;Riegert et al 2007b). The kestrels were trapped near their breeding places using an imitation eagle owl (Bubo bubo).…”

Section: Field Data Collectingmentioning

confidence: 99%

Genetic variability, body characteristics and reproductive parameters of neighbouring rural and urban common kestrel (Falco tinnuculus) populations

2009

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We tested the genetic and ecological differences between neighbouring urban and rural populations of common kestrels (Falco tinnuculus) in southern Bohemia. The aims were to (1) assess the genetic variability of the studied kestrel populations using microsatellite markers, (2) check the genetic relatedness of individuals within the urbanization gradient, and (3) compare possible gradients of body characteristics and reproductive parameters on the urbanization gradient. The mean expected allelic polymorphism did not differ among the studied populations, which were not genetically separated (F ST = 0.0003, P = 0.781). Also, an individual assignment test did not show a separation of these populations. Urban kestrels that bred in the city centre were indicatively more related than others, and no relationship was found in the rural kestrel population. Kestrel females were heavier towards the city centre, but males did not show this relationship. Nest distance from the city centre had no significant effect on any of the tested reproductive parameters. Our results do not support the notion of genetic differentiation between rural and urban kestrels, but revealed trends in body characteristics and genetic relatedness along the urbanization gradient.

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“…Less is known about the red-footed falcon (Falco vespertinus) diet, where insects predominate and are sometimes substituted with small vertebrates (see review in . There are differences however in the importance of particular taxa in the diet of both species in different parts of their breeding range (Keve & Szijj 1957, Riegert et al 2007). Some of these differences have natural character, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers have focused on the diet composition and foraging ecology of falcons, predominantly the myophagous Eurasian kestrel (Falco tinnunculus) (cf. review in Korpimäki 1985, 1986, Riegert et al 2007, 2009. Less is known about the red-footed falcon (Falco vespertinus) diet, where insects predominate and are sometimes substituted with small vertebrates (see review in .…”

Section: Introductionmentioning

confidence: 99%

Diet composition of syntopically breeding falcon species Falco vespertinus and Falco tinnunculus in south-western Slovakia

Tulis¹,

Slobodník²,

Langraf³

et al. 2017

Slovak Raptor Journal

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The red-footed falcon and Eurasian falcon represent two syntopical falcon species. While the Eurasian falcon is considered a common and numerous species in Slovakia, the red-footed falcon population has undergone a considerable decline during the past few decades. Nowadays it nests in a single locality in Slovakia, the Sysľovské polia Special Protection Area, which forms the northern and fragmented border of the species distribution area in Europe. By analysing prey remains from 9 nests (from 1998, 2001, 2013, 2014 and 2016), we identified 433 prey items belonging to 35 taxa and 9 orders. Every year, invertebrates made up the major part of the diet spectrum, in which Calosoma auropunctatum, Tettigonia viridissima, Zabrus tenebrioides, Anisoplia aegetum and Rhizotrogus sp. were the most frequent species of prey. Of the vertebrates, Microtus arvalis was the most hunted prey species. By supplementary analysis of 21 photos, we extended our knowledge on the diet by other 6 taxa. The peak of the M. arvalis population growth in 2014 did not manifest itself in the red-footed falcon diet composition. In 1998, 2014 and 2016 we also studied the diet of a syntopical species, the Eurasian kestrel. By analysing prey remains in 22 nests, we identified 1,151 prey items belonging to 37 taxa and 7 orders. In 1998 and 2014 vertebrates predominated, especially the common vole, however in 2016 invertebrates prevailed. This fact could be a reaction to the M. arvalis population peak in 2014 and its decline in 2016. These results suggest that this variability in the foraging behaviour of the Eurasian kestrel, an opportunistic predator, during the hunting of invertebrates increases the diet similarity and overlapping of the food niche of both studied falcon species.Abstrakt: Sokol kobcovitý a sokol myšiar predstavujú dva syntopicky sa vyskytujúce druhy sokolov. Kým sokol myšiar je na Slovensku považovaný za bežný a početný druh, populácia sokola kobcovitého zaznamenala v posledných dekádach značný pokles. V súčasnosti tento druh hniezdi na Slovensku na jedinej lokalite -Chránenom vtáčom území Sysľovské polia, ktorá predstavuje severnú a fragmentovanú hranicu rozšírenia druhu v Európe. Analýzou potravných zvyškov z 9 hniezd (z rokov 1998, 2001, 2013, 2014 a 2016) sme tam determinovali 433 kusov koristi prislúchajúcich 35 taxónom a 9 radom. Bezstavovce tvorili každoročne majoritnú časť potravy, kde najčastejšie zastúpenými druhmi boli Calosoma auropunctatum, Tettigonia viridissima, Zabrus tenebrioides, Anisoplia segetum, Rhizotrogus sp. Zo stavovcov bol najčastejšie lovený druhom hraboš poľný. Doplnkovou analýzou 21 fotografií sme spektrum potravy rozšírili o ďalších 6 taxónov. Vrchol gradácie hraboša poľného v roku 2014 sa na zložení potravy sokola kobcovitého neprejavil. V rokoch 1998, 2014 a 2016 sme tiež sledovali potravu syntopického druhusokola myšiara. Analýzou potravných zvyškov 22 hniezd sme zistili 1151 zvyškov koristi, ktoré patrili 37 taxónom zo siedmych radov. V rokoch 1998 a 2014 v potrave dominovali stavovce, n...

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Increased hunting effort buffers against vole scarcity in an urban KestrelFalco tinnunculuspopulation

Cited by 33 publications

References 29 publications

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Genetic variability, body characteristics and reproductive parameters of neighbouring rural and urban common kestrel (Falco tinnuculus) populations

Diet composition of syntopically breeding falcon species Falco vespertinus and Falco tinnunculus in south-western Slovakia

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