Intraspecific Exploitation Competition as Cause for Density Dependent Breeding Success in the White Stork

Denac, Damijan

doi:10.1675/1524-4695(2006)29[391:iecacf]2.0.co;2

Cited by 21 publications

(17 citation statements)

References 7 publications

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“…Reduced breeding success in high breeding densities has been reported in other European populations of white stork (Barbraud et al 1999). 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).…”

Section: Discussionsupporting

confidence: 93%

“…This kind of pattern is especially expected in such species as the white stork, where high quality individuals have capabilities to monopolize available resources at the expense of the neighbouring low-quality pairs, thus reducing their reproductive output (Denac 2006). Under such conditions, a density dependence in reproductive success is likely to occur, which has already been reported for different European populations of white stork (Barbraud et al 1999;Sasvári et al 1999).…”

Section: Introductionmentioning

confidence: 67%

“…Such a pattern could most possibly arise due to intensified competition for food resources during the period of chick rearing in years when early breeders arrived late. Aggressive territorial behaviour of storks is often confined to the closest vicinity of their nests, preventing them from being overtaken by conspecific intruders (Denac 2006). However, storks not always act with aggression towards their neighbours.…”

Section: Discussionmentioning

confidence: 99%

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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: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

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

2013

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“…Pairs breeding alone and pairs with one neighbour within their home range most frequently reared three chicks, pairs with two neighbours reared two, whereas pairs with three or four neighbours most frequently failed to raise even a single chick. Intraspecific exploitation competition was the cause for density-dependent breeding success (Denac 2006a).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, two autecological studies were carried out on the White Stork population in Slovenia using census data. With the first one, we explained density dependent breeding success with intraspecific exploitation competition (Denac 2006a), whereas the second study showed that weather effect in the reproduction of the White Stork is resource-dependent (Denac 2006b). In this work we present results of the White Stork censuses carried out between 1999 and 2010.…”

Section: Comm)mentioning

confidence: 99%

Population dynamics of the White Stork Ciconia ciconia in Slovenia between 1999 and 2010

Denac¹

2010

Acrocephalus

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Population dynamics of the White StorkCiconia ciconiain Slovenia between 1999 and 2010Between 1999 and 2010, an annual census of the White StorkCiconia ciconiabreeding population was carried out in Slovenia using standardised methods. The Stork's population was concentrated in the NE and SE parts of Slovenia. In the 1999-2010 period, the breeding range of its population in Slovenia expanded in NW direction (the Savska ravan region), in SW direction (the Notranjsko podolje and Pivško podolje regions), but the species also colonized a part between Central and SE Slovenia (Dolenjsko podolje). Between 193 and 240 pairs were breeding during the study period, 209 pairs on average (HPa). The largest number of breeding pairs was recorded in 2004, the smallest in 2005. During the study period, breeding pairs (HPa) occupied 350 discrete nests in total. Average number of breeding pairs that raised juveniles (HPm) was 161. The highest fecundity was recorded in 2004, when 534 juveniles (JZG) fledged, the lowest in 2006, with only 219 fledged juveniles. On average, 414 juveniles fledged per year. The breeding pairs' (JZa) average breeding success in these 12 years was 2.02, the highest in 2000 (2.41), the lowest in 2006 (1.09). Average breeding success for the successful breeding pairs (JZm) was 2.57. The highest was in 2007 (2.94), the lowest in 2006 (2.07). The largest number of breeding pairs in 2004 and 2008 can be explained by the favourable fecundity in the population in 2000 and 2004, as juveniles become sexually mature at the age of 3-5 years, and at that age they generally return to the breeding grounds for the first time. The lowest number of breeding pairs and poor breeding success in 2005 and 2006 was caused by late arrival of White Storks to the breeding grounds and by unfavourable weather conditions during the breeding period. The pattern of nests placement did not change generally during the last 12 years. The largest proportion of nests was positioned on various kinds of poles (81%) and on chimneys (18%). In total, 27 area surveyors and 239 assistants helped in census realisation.

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Effects of density, species interactions, and environmental stochasticity on the dynamics of British bird communities

Sandal

Grøtan

Sæther

et al. 2022

Ecology

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Our knowledge of the factors affecting species abundances is mainly based on time-series analyses of a few well-studied species at single or few localities, but we know little about whether results from such analyses can be extrapolated to the community level. We apply a joint species distribution model to longterm time-series data on British bird communities to examine the relative contribution of intra-and interspecific density dependence at different spatial scales, as well as the influence of environmental stochasticity, to spatiotemporal interspecific variation in abundance. Intraspecific density dependence has the major structuring effect on these bird communities. In addition, environmental fluctuations affect spatiotemporal differences in abundance. In contrast, species interactions had a minor impact on variation in abundance.Thus, important drivers of single-species dynamics are also strongly affecting dynamics of communities in time and space.

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Intraspecific Exploitation Competition as Cause for Density Dependent Breeding Success in the White Stork

Cited by 21 publications

References 7 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)

Population dynamics of the White Stork Ciconia ciconia in Slovenia between 1999 and 2010

Effects of density, species interactions, and environmental stochasticity on the dynamics of British bird communities

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