Population Dynamics of Cory’s Shearwater (Calonectris diomedea) and Eleonora’s Falcon (Falco eleonorae) in the Eastern Mediterranean

Ristow, Dietrich; Feldmann, F.; Scharlau, W.; Wink, Coralie; Wink, Michaël

doi:10.1007/978-3-0348-6426-8_14

Cited by 18 publications

(18 citation statements)

References 16 publications

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“…The better area coverage was reflected in certain regions where the increase in population estimates was extraordinary, namely NE Aegean (+390%), Sporades (+220%), Cyclades (+110%) or intermediate in Kythira (+50%) and Dodecanese (+25%). In contrast, in the region of Crete, a population decline at a rate of 15% per year during the period 1997-2000 (Ristow 2001) has been reported for certain colonies, which have been closely monitored since 1965 (Ristow et al 1989(Ristow et al , 1991. This negative trend was attributed to incidences of secondary poisoning in the foraging areas over Crete (Ristow et al 2000;Tsatsakis et al 2001;Xirouchakis 2004), though deterioration of food abundance in both the wintering and breeding quarters should not be ruled out (Tingle and McWilliam 1999;Thorstrom and Rene de Roland 2000;Sanderson et al 2006).…”

Section: Discussionmentioning

confidence: 86%

The status of Eleonora’s Falcon (Falco eleonorae) in Greece

Dimalexis¹,

Xirouchakis

Portolou³

et al. 2007

J Ornithol

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With more than 80% of the species global population breeding in Greece, Eleonora's Falcon (Falco eleonorae) is reported to be the most important bird species in the country. A national population survey was conducted during the breeding seasons 2004-2006 in order to assess the species' breeding distribution and population size. This census was the first of its kind and was part of a global population survey, involving more than 80 field workers. Standard field protocols, described in the International Species Action Plan, and a GIS interactive database were developed. Data were stored and spatially explored in conjunction to historical information and past records. A total of about 17,660 falcons were counted or an estimated 12,300 breeding pairs, which were concentrated in six major regions, i.e., northeast Aegean, Sporades, east Cyclades, Antikythira, southwest Dodecanese and the satellite islets of eastern Crete. Compared to previous descriptions of breeding colonies and population status, spatial variation in site occupancy was detected with a population decline in one of the aforementioned regions and an apparent increase in all the rest. The results of this national survey, expected to be repeated every 10 years, provided guidance for reviewing the conservation status of Eleonora's Falcon in Greece and baseline information for future monitoring of its population.

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Section: Discussionmentioning

confidence: 86%

The status of Eleonora’s Falcon (Falco eleonorae) in Greece

Dimalexis¹,

Xirouchakis

Portolou³

et al. 2007

J Ornithol

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“…Different social and ecological constraints may enforce frequent interbreeding between relatives. For example, attraction to the natal nest-site may be a key factor favoring the occurrence of inbreeding if juveniles of both sexes experience similar attraction to natal colonies, as seems to be the case in this highly philopatric species (Walter 1979; Ristow et al 1991; Gangoso et al 2013). However, natal dispersal distances within the colony were higher in females than in males, a difference that would not seem to be great enough to counteract the likelihood of incestuous mating, provided that individuals have the ability to recognize relatives.…”

Section: Discussionmentioning

confidence: 93%

Breeding success but not mate choice is phenotype- and context-dependent in a color polymorphic raptor

Gangoso

Figuerola

2019

Behavioral Ecology

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Morph-specific mate choice has been proposed as one of the evolutionary mechanisms that contribute to the maintenance of variation in color polymorphic systems. Coloration usually covaries with other phenotypic traits affecting life history and thus is often used as a criterion for mate choice. Here, we assess whether mating patterns, natal dispersal, and breeding output are phenotype-dependent in the color polymorphic Eleonora’s falcon. We used a long-term dataset of 946 individually ringed adult falcons that included 109 individuals monitored from birth up to recruitment into the breeding population. Overall, patterns of mate choice with regard to coloration were neither assortative nor disassortative. Natal dispersal distance was greater in females but was not associated with coloration. Breeding success was both morph-dependent and context-dependent. Although clutch size was similar in differently colored pairs, differences arose in the number of chicks that fledge. In some years, dark males raised more offspring, regardless of female color morph. Differences in the breeding tactics between male morphs could be associated with intraspecific predation and may thus contribute to the observed differences in breeding output, especially when food availability is low. This suggests that mating patterns may interact with other factors and give rise to the observed higher breeding output of dark males only under certain environmental conditions.

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“…De telles espèces peuvent se permettre de sauter une année de reproduction quand les conditions alimentaires sont médiocres, ce qui n'est sans doute pas le cas pour des espèces à durée de vie plus courte. Ces -284 - (Ristow et al , 1991), t = 4,2, p < 0,01 -et la Corse -7,1 ± 1,6 ans (Thibault, 1995), t = 7,0, p < 0,01. Il est également plus élevé que chez nombre de Procellariidés, où i 1 s'établit en général aux alentours de 6-7 ans (Brooke, 1990 ;Marchant & Higgins, 1990 ;Mougin, 1997 ;Richdale, 1963 ;Roux, 1977 ;Wooller et al , 1988), à la notable exception des pétrels géants -au moins 9 ans (Conroy, 1972 ;Marchant & Higgins, 1990 ;Vo isin, 1988) -du Pétrel des neiges -9,9 années (Chastel et al , 1993) et du Fulmar boréal -11,0 années (Dunnet, 1991).…”

Section: Discussionunclassified

“…La mortalité au nid des oeufs et des poussins est remarquablement constante d'une année à l'autre à Selvagem Grande -elle varie entre 35 et 54 %, contre 7-69 % dans les îles de Marseille (Femandez, 1996) et 30-92 % en Corse (Thibault, 1995). En moyenne, elle varie peu d'une localité à l'autre et elle reste, dans l'ensemble, assez faible -entre 24 et 54 % (Cachia Zammit & Borg, 1986-1987Femandez, 1984Femandez, , 1996Gaultier, 1978 ;Monteiro et al , 1996 ;Mougin et al , 1987Mougin et al , , 1993Ristow et al , 1991 ;Thibault, 1985Thibault, , 1995. Pertes relativement réduites donc, surtout si on considère que plusieurs de ces localités hébergent des mammifères prédateurs introduits qui, sous d'autres cieux, peuvent éliminer la totalité de la production d'une année de certains pétrels.…”

Section: Discussionunclassified