Foraging in a Patchy and Dynamic Landscape: Human Land Use and the White Stork

Johst, Karin; Brandl, Rolan; Pfeifer, Robert N. C.

doi:10.2307/3061055

Cited by 31 publications

(71 citation statements)

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“…Colonial breeding of storks could be maintained through evolution, as feeding areas of neighbouring pairs are spatially separated from their nesting locations. In consequence, white storks are often forced to make long foraging trips that usually take up to 5 km (Johst et al 2001;Moritzi et al 2001), but occasionally could be even longer (Alonso et al 1994). For the same reason, neighbouring breeding pairs frequently share the same foraging areas.…”

Section: Discussionmentioning

confidence: 99%

Timing of arrival at breeding grounds determines spatial patterns of productivity within the population of white stork (Ciconia ciconia)

2013

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Early arrival at breeding grounds have important fitness consequences for migratory birds, both at individual and population level. The aim of this study was to investigate how the timing of arrival at the breeding territories affects the spatial patterns of reproductive success within a population of white storks (Ciconia ciconia). Data were gathered annually for ca. 200 pairs of storks breeding in central Poland between 1994 and 2011. Geostatistical analysis of data indicated that in years of delayed arrival of the population (measured by the first quartile arrival date), the reproductive output of storks was negatively autocorrelated, which indicated that there was a tendency for pairs of high breeding success to neighbour with pairs of low success. By contrast, in years when first storks returned in early dates to the breeding grounds, their reproductive success did not show any kind of spatial autocorrelation. These results suggest that delayed return of the first-arriving storks of the population may increase intensity of intra-specific competition to the level at which high-quality breeding pairs monopolize most of available resources at the expense of neighbouring lowquality pairs, which have lower reproductive success as a consequence. Such hypothesis was further supported with the analysis of nesting densities, showing that the latearriving breeding pairs incurred greater fitness costs (or derived lower fitness benefits) while breeding in high densities comparatively to the early-arriving conspecifics.

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Section: Discussionmentioning

confidence: 99%

Timing of arrival at breeding grounds determines spatial patterns of productivity within the population of white stork (Ciconia ciconia)

2013

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“…The role of prey availability and access to suitable feeding habitats in the vicinity of human settlements during the breeding season is rather well understood in White Storks. The species is therefore a good indicator for testing the influence of major habitat disturbances in arable lands, such as agricultural intensification (JOHST et al 2001, TRYJAN-OWSKI et al 2009). Moreover, the White Stork is a good biodiversity indicator (TOBOLKA et al 2012), and so the monitoring of local population changes is important.…”

Section: Introductionmentioning

confidence: 99%

Nesting habits and breeding success of the White Stork,Ciconia ciconia, in the Kızılırmak delta, Turkey

Erciyas-Yavuz

Yavuz²,

Tavares

et al. 2012

Zoology in the Middle East

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Abstract.A total of 926 nests of the White Stork (Ciconia ciconia) was found in a survey conducted in the KÕzÕlÕrmak delta on the Black Sea coast of Turkey in 2010. Breeding success was 3.82 young per successful nest, which is very high compared to other studies in and outside Turkey. The breeding population has increased from 125-130 pairs in 1992 to at least 870 breeding pairs in 2010 (158.5/100 km 2 ). This population increase is apparently related to the increase in rice cultivation, which has more than tripled in the delta since 1992.

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“…Such phenomenon is expected in central-place foragers, which execute foraging trips to remote locations, but consistently return to a central place, the nest, to deliver food to offspring (Orians and Pearson 1979). In such species, travelling long distances to favourable feeding patches is costly in terms of time and energy (Johst et al 2001), so if food availability allows, they primarily tend to exploit areas in the close neighbourhood of the nest. The evidence that depletion of food availability may increase foraging distances as the season progresses has already been demonstrated for the Spanish population of white storks (Alonso et al 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Even assuming that availability of such prey as insects increases late in the summer, this type of food is associated with low energy intake per time unit, as much time must be invested in food collection. Alternatively, birds may try to locate ephemeral patches of high food availability, such as freshly mowed meadows or harvested fields, but the strategy of optimal patch selection in a dynamic landscape may also be time consuming (Johst et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Shortening day length as a previously unrecognized selective pressure for early breeding in a bird with long parental care

Podlaszczuk¹,

Wojciechowski

Podlaszczuk

et al. 2014

J Ornithol

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Several different selective pressures have been suggested to explain an intense competition for early return to breeding grounds in birds. In this study we hypothesized that shortening day length during summer months may constitute additional selective force acting towards early breeding in avian species with long parental care. To test this hypothesis, we studied time budget and foraging activities of early-nesting and late-nesting white storks Ciconia ciconia from the Central-European population. We found that duration and distance of foraging trips increased significantly over the course of the reproductive season. The relative frequency of foraging trips increased at the expense of other activities, such as resting, plumage maintenance, and nest maintenance. Mean daily foraging duration increased with increasing day length in the early part of the season, with 0.68 h of foraging per individual per 13.16 h of day length in mid-April increasing to 7.42 h of foraging per individual during solstice (16.61 h of day length). Afterwards, mean foraging duration continued increasing in spite of decreasing day length, reaching 11.63 h of foraging per individual per 14.92 h of day length at the end of the season in mid-August, when storks were forced to continue foraging after sunset in order to meet energy requirements of fledglings. The results suggest that shortening day length during summer months may constitute a serious time constraint on food delivery rates to offspring for late-breeding pairs of white stork.Keywords Ciconia ciconia Á Foraging Á Photoperiod Á Timing of breeding Á White stork Zusammenfassung Kü rzere Tage sind ein bisher unbekannter Selektionsdruck fü r frü hen Brutbeginn in einer Vogelart mit langer elterlicher Fü rsorge Verschiedene Selektionsfaktoren wurden bisher herangezogen zu erklären, warum Vögel so intensiv konkurrieren möglichst früh im Brutgebiet anzukommen. In dieser Studie untersuchten wir die Hypothese, dass kürzere Tage während der Sommermonate in Arten mit langer Elternfürsorge einen weiteren Selektionsfaktor darstellen, der frühen Brutbeginn begünstigt. Um diese Hypothese zu testen verglichen wir die Zeiteinteilung und Dauer der Nahrungssuche bei früh und spät nistenden Weißstörchen Ciconia ciconia in einer zentraleuropäischen Population. Die Dauer und Entfernung von Nahrungsflügen nahm im Laufe der Brutsaison signifikant zu. Die relative Häufigkeit von Nahrungsflügen stieg ebenfalls an, was auf Kosten anderer Aktivitäten wie Rast, Gefiederpflege und Nestpflege geschah.

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Foraging in a Patchy and Dynamic Landscape: Human Land Use and the White Stork

Cited by 31 publications

References 0 publications

Timing of arrival at breeding grounds determines spatial patterns of productivity within the population of white stork (Ciconia ciconia)

Timing of arrival at breeding grounds determines spatial patterns of productivity within the population of white stork (Ciconia ciconia)

Nesting habits and breeding success of the White Stork,Ciconia ciconia, in the Kızılırmak delta, Turkey

Shortening day length as a previously unrecognized selective pressure for early breeding in a bird with long parental care

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