Human activity and the drying up of rivers determine abundance and spatial distribution of Black Storks<i>Ciconia nigra</i>on their wintering grounds

Chevallier, Damien; Maho, Yvon Le; Baillon, François; Duponnois, Robin; Dieulin, Claudine; Paul, Brossault; Franclieu, Philippe De; Lorgé, Patric; Aurouet, Axel; Massemin, Sylvie

doi:10.1080/00063651003678467

Cited by 16 publications

(19 citation statements)

References 43 publications

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“…This change in the migratory strategy seems to be common to many species and appears to be the result of global changes, to which birds seem to react quite rapidly (Fiedler , Visser et al ). For this reason, the concern over the conservation of the black stork in sub‐Saharan countries (Chevallier et al , Jiguet et al , Cano et al ) has been extended to this pre‐Saharan wintering ground (San Segundo , Mañez et al , Cano ). These new patterns in the winter distribution of the black stork require examination to explore the processes involved and to evaluate whether there is a need for proactive or preventive conservation measures to protect wintering sites in Iberia.…”

mentioning

confidence: 99%

Geographical and environmental factors affecting the distribution of wintering black storks Ciconia nigra in the Iberian Peninsula

Cano¹,

Pacheco

Refoyo³

et al. 2014

Journal of Avian Biology

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Here we explore the environmental and geographical factors affecting the winter distribution of the black stork Ciconia nigra in the Iberian Peninsula, where an increasing number of individuals have remained to winter in the last two decades. We recorded 179 locations of 54 ringed individuals between 1988 and 2011 to map the species habitat suitability with MaxEnt, a machine‐learning technique based on the principle of maximum entropy. The migratory movements of 25 birds equipped with satellite transmitters were used to define the autumnal migratory flyway used by most storks crossing the Peninsula as well as to define the wintering period. The aim was to test if the number of wintering storks was positively correlated to habitat suitability and negatively correlated to the flyway distance. Data provided by an extensive count across Portugal and Spain during the 2012–2013 winter supported the findings that black storks were more abundant in areas of high habitat suitability close to the migratory flyway. This agrees with previous evidence on the role of migratory flyways in determining the distribution of some wintering birds in Iberia. A gap analysis reflected that just 12.3% of the suitable areas and 18.8% of individuals recorded during the 2012–2013 winter were included within the Special Protection Areas network of Portugal and Spain. Most of these birds were crowded in unprotected areas covered by rice fields (68% of individuals), a key habitat for the species.

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confidence: 99%

Geographical and environmental factors affecting the distribution of wintering black storks Ciconia nigra in the Iberian Peninsula

Cano¹,

Pacheco

Refoyo³

et al. 2014

Journal of Avian Biology

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“…Fires may increase the loss of foraging grounds and increase home range size (already large, i.e. on average 108 450 hectares, Chevallier et al 2010). The status of threatened species is legitimate in Europe, and this is even more so in Africa.…”

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confidence: 99%

The Importance of Roosts for Black StorksCiconia nigraWintering in West Africa

Chevallier

Duponnois²,

Baillon

et al. 2010

Ardea

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“…Black storks arrive just at the end of this period and, as with many other species, benefit from the productive output resulting from summer rains (Moreau 1972). However, in Africa the black stork is a fish‐eating species (Chevallier et al 2008) selecting intermittent rivers with small‐sized ponds where it is easy to capture prey (Chevallier et al 2010b). In September, banks of lowland rivers and pools of seasonal creeks start to sink as drought advances throughout the winter (Zwarts et al 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Finally, central European and Iberian populations of the black stork may show an interspersed distribution within the wintering grounds of the Sahel, where they seek suitable water bodies (Chevallier et al 2010b, Jiguet et al 2011). One pattern will result if all birds crossing the Strait of Gibraltar move together to the western half of the Sahel where they search together for the most suitable sites in a context of changing availability of water resources (Zwarts et al 2009).…”

Section: Winter Distributionmentioning

confidence: 99%

Migration and winter distribution of Iberian and central European black storks Ciconia nigra moving to Africa across the Strait of Gibraltar: a comparative study

Cano¹,

Tellería²

2013

Journal of Avian Biology

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This paper compares the migratory movements of Iberian and central European satellite‐tagged black storks Ciconia nigra moving to Africa across the Strait of Gibraltar. Results show that the populations differ in departure dates from breeding areas (central European birds start to move 15 d before Iberian birds), cross the Strait of Gibraltar together and reach the Sahel on similar dates. This synchronic arrival to the Sahel may be related with the onset of suitable conditions for the species after summer rains, when many pools are available for fishing. In this area, Iberian birds occupied westernmost localities compared to central European birds crossing the Strait of Gibraltar, which were distributed closer to those storks arriving in Africa across the Bosporus. This suggests that the parallel distribution of breeding and wintering areas results from posterior rearrangements of the two populations crossing Gibraltar. These patterns appear to be linked to the increasing population of central European black storks located on the western side of the migratory divide that moves throughout the western flyway to sectors of the Sahel close to their ancestral wintering grounds.

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Human activity and the drying up of rivers determine abundance and spatial distribution of Black StorksCiconia nigraon their wintering grounds

Cited by 16 publications

References 43 publications

Geographical and environmental factors affecting the distribution of wintering black storks Ciconia nigra in the Iberian Peninsula

Geographical and environmental factors affecting the distribution of wintering black storks Ciconia nigra in the Iberian Peninsula

The Importance of Roosts for Black StorksCiconia nigraWintering in West Africa

Migration and winter distribution of Iberian and central European black storks Ciconia nigra moving to Africa across the Strait of Gibraltar: a comparative study

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