Food Supply and External Cues Limit the Clutch Size and Hatchability in the White Stork<i>Ciconia ciconia</i>

Djerdali, Sofia; Tortosa, Francisco S.; Hillström, Lars; Doumandji, Salaheddine

doi:10.3161/000164508x395252

Cited by 36 publications

(32 citation statements)

References 40 publications

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“…Density-dependent patterns of reproductive success of white storks in Slovenia were suggested to arise due to the intra-specific exploitation competition, which is consistent with our results (Denac 2006). This hypothesis was also supported by food supplementation experiments which demonstrated that, at least in some populations, reproductive success of white storks is limited by the food availability during the breeding season (Djerdali et al 2008). Similarly, it was found that stork pairs occupying territories with unlimited anthropogenic food supplies and negligible intra-specific competition (e.g., near rubbish dumps) had higher reproductive success in comparison to pairs that exploited natural food resources, even if their territories were of good quality (Tortosa et al 2002;Massemin-Challet et al 2006).…”

Section: Discussionmentioning

confidence: 80%

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: 80%

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

2013

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“…Schulz 1998;Massemin-Challet et al 2006;Djerdali et al 2008;Kosicki 2010;Vergara et al 2010). We found that the number of eggs was best explained by the arrival date of the second stork at the nest, rather than by local weather or land cover.…”

Section: Discussionmentioning

confidence: 87%

“…In contrast, predation might not play such an important role for the population dynamics of such a large bird (cf. Djerdali et al 2008).…”

Section: Introductionmentioning

confidence: 95%

“…The employment of the number of laid eggs as an estimate of reproductive success, particularly in the long term, has been less common (but see MasseminChallet et al 2006;Vergara et al 2007;Djerdali et al 2008;Kosicki and Indykiewicz 2011). However, this very examination of the percentage of eggs that successfully turned into fledglings could enhance the knowledge on offspring mortality and its causes, thus enabling a better assessment of this species susceptibility to environmental changes.…”

Section: Introductionmentioning

confidence: 96%

“…Due to their low thermoregulation abilities during the first 3 weeks after hatching, the semi-altricial White Stork nestlings are particularly sensitive towards cold and wet weather conditions, which can lead to hypothermia (Tortosa and Castro 2003;Jovani and Tella 2004;Kosicki 2012;Gordo et al 2013), and make them more susceptile to diseases (Olias et al 2010). Favourable feeding conditions, on the other hand, promote White Stork reproductive outcome (Tortosa et al 2002;Massemin-Challet et al 2006;Hušek et al 2013) by stimulating both the number of eggs laid (Sasvári and Hegyi 2001;Djerdali et al 2008) as well as nestling development (Kosicki and Indykiewicz 2011). White Storks forage preferentially in wet open landscapes with short vegetation (Alonso et al 1991;Dziewiaty 2005), where their principal food consists of insects, earthworms, amphibians and voles (Antczak et al 2002).…”

Section: Introductionmentioning

confidence: 96%

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To fledge or not to fledge: factors influencing the number of eggs and the eggs-to-fledglings rate in White Storks Ciconia ciconia in an agricultural environment

Eggers

Arens²,

Firla³

et al. 2015

J Ornithol

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Numerous studies have explored the relationship between environmental factors and White Stork Ciconia ciconia reproduction, mainly expressing breeding success as the number of fledglings. Nonetheless, one of the most critical life-history stages in birds falls between egg-laying and fledging, and identifying the factors causing offspring mortality during this period provides valuable knowledge. We quantified the number of laid White Stork eggs and the proportion of eggs that turned into fledglings in an agriculture-dominated region in Eastern Germany. Moreover, we identified the factors among land cover, weather and arrival dates, which influenced these two reproductive measures the most, and analysed the monitored mortality causes. On average, four eggs were laid per nest, and 57.8 % of the eggs turned into fledglings. The number of eggs laid was best explained by the negative effect of the arrival date of the second stork, while the percentage of eggs that turned into fledglings was more dependent on weather: most important parameters were mean temperature in the fifth and seventh weeks after the assumed breeding start (i.e. around the assumed hatching date), and the number of consecutive days with precipitation when nestlings are assumed to be approximately 3 weeks old. In an agricultural environment, weather effects that potentially disturb food availability might be more important than effects directly affecting the survival of White Stork offspring. The most frequent observed mortality cause, nest fights, furthermore revealed the relevance of intraspecific competition in the study population.

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Hyacinth Macaw (Anodorhynchus hyacinthinus) nests in a mosaic of protected areas in Carajás and surrounding areas, state of Pará, Brazil

Silva

Presti

Rechetelo

et al. 2019

Rev. Bras. Ornitol.

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Natural history studies can provide information that can be used in species conservation and management. The present study provides information about the nests and nest sites of Hyacinth Macaws (Anodorhynchus hyacinthinus) in a mosaic of protected areas in Carajás and surrounding areas in the Amazon region of the state of Pará, Brazil. Data were collected during four expeditions conducted in 2007, 2008, 2013 and 2014. A total of 66 tree cavities were monitored, and 28 of these were used by Hyacinth Macaws. In addition, 38 breeding events were recorded (some nests were active in multiple seasons), and 17 eggs and 33 nestlings were observed. Environmental variables for the 24 cavities that were actively used by Hyacinth Macaws were evaluated. Most of the nest cavities were located in Sterculia sp. trees (86.6%) and in open areas (e.g., near pastures). Nesting tree and cavity measurements were variable, but the mean diameter at breast height of the trees containing Hyacinth Macaw nest cavities was larger than that reported from other regions, such as the Pantanal. The present study describes the unique ecology and life history of Hyacinth Macaws in Carajás, for which information is scarce. This information will facilitate the conservation and management of Hyacinth Macaws and can be used locally for environmental education.

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Food Supply and External Cues Limit the Clutch Size and Hatchability in the White StorkCiconia ciconia

Cited by 36 publications

References 40 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)

To fledge or not to fledge: factors influencing the number of eggs and the eggs-to-fledglings rate in White Storks Ciconia ciconia in an agricultural environment

Hyacinth Macaw (Anodorhynchus hyacinthinus) nests in a mosaic of protected areas in Carajás and surrounding areas, state of Pará, Brazil

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