Population changes and breeding ecology of the Cirl Bunting<i>Emberiza cirlus</i>in eastern Spain

Ponz, Adrián; Barba, Emilio; Gil‐Delgado, José A.

doi:10.1080/00063659609460994

Cited by 16 publications

(13 citation statements)

References 21 publications

(46 reference statements)

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“…The results of our work show that, in the studied Tadla orchards, Turtle Doves face comparable threats to those known for other birds in similar habitat types in North America (Knight et al 1984, Mitchell et al 1996 and southern Europe (Ponz et al 1996, Gil Delgado et al 1991. This game species appears, however, to be well-adapted to orchard conditions.…”

Section: Discussionmentioning

confidence: 52%

“…The location of each nest tree was marked on a map of the study plot. To minimize observerinduced disturbance, active nests were visited four times until failing or the young fledged (Nichols et al 1984, Westmoreland & Best 1985, Götmark 1992, Ponz et al 1996, Rivera-Milan 1996. For each monitored nest, we noted the laying date, clutch size and brood size.…”

Section: Study Areamentioning

confidence: 99%

See 1 more Smart Citation

Are Moroccan fruit orchards suitable breeding habitats for Turtle DovesStreptopelia turtur?

Hanane¹,

Baamal

2011

Bird Study

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Section: Discussionmentioning

confidence: 52%

Section: Study Areamentioning

confidence: 99%

Are Moroccan fruit orchards suitable breeding habitats for Turtle DovesStreptopelia turtur?

Hanane¹,

Baamal

2011

Bird Study

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“…Since 1975, mapping methods and nest searching techniques have been applied. Every year, nest searching started in the first week of March and went on until early August (Gil-Delgado 1981, Belda et al 1995, Gil-Delgado & Lacort 1996, Ponz et al 1996, Gil-Delgado et al 2002. Fieldwork started even earlier in some years because of the continuous singing of other birds, which possibly indicated that the season would be early.…”

Section: Study Area and Methodsmentioning

confidence: 99%

“…The data come from a 16.9-ha orange grove that has been widely referred to in the past (e.g. Gil-Delgado 1981, Barba et al 1995, Ponz et al 1996. Since 1975, mapping methods and nest searching techniques have been applied.…”

Section: Study Area and Methodsmentioning

confidence: 99%

Seasonal clutch size variation of multi‐brooded bird species: comparisons between breeding season and latitudes

Gil‐Delgado

Marco

Paredes

et al. 2004

Ibis

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Single-and multi-brooded species of birds differ in their seasonal patterns of clutch size. Single-brooded species start with a maximum clutch size that declines continuously as the season progresses, whereas the clutch sizes of multi-brooded species usually increase to a mid-season maximum peak and then decrease progressively until the end of the breeding season. Previous studies have shown that multi-brooded migrant species present seasonal patterns that are similar to single-brooded species at high latitudes but similar to multibrooded non-migratory species at lower latitudes. We studied the Greenfinch Carduelis chloris and Goldfinch C. carduelis populations in eastern Spain (Sagunto, Valencia) between 1975 and to compare seasonal variations in clutch sizes between years with early and late starts to the breeding season. The period over which clutch sizes increase was longer when the breeding season started earlier. The Goldfinch population showed no pattern of initial increase in clutch size when there was a late start to the breeding season: a late start shortens the season giving them less time to breed, and may also coincide with maximum food availability. Thus, the pattern of single-brooded species was observed. In the Greenfinch population, a trend toward the seasonal pattern of single-brooded species was also observed when the following indices were compared: clutch size increase, modal timing, initial slope and timing of maximum clutch size. We have also compared the seasonal patterns of clutch size of both species in eastern Spain with the patterns observed in Britain. Our results show that for both Goldfinches and Greenfinches, the non-migrant southern populations of Sagunto in eastern Spain do not tend towards a more multi-brooded seasonal pattern of clutch size than the migrant Goldfinches of Britain.Passerine birds use two tactics to maximize their number of offspring per breeding season. In singlebrooded species, the clutch size is at its maximum at the start of the breeding season and declines as the season progresses. Multi-brooded species, however, present a different pattern. Their breeding season is longer and females lay several clutches with a midseason peak of clutch size (Lack 1954, Klomp 1970. Therefore, in multi-brooded species, seasonal reproductive success is determined not only by the productivity of each brood but also by the number of broods raised (Bryant 1979, Desrochers & Magrath 1993. As a consequence, Crick et al. (1993) suggested that multi-brooded species start laying before the optimal moment, which accounts for the increase in clutch sizes until the optimal time, when clutch sizes are the largest. In addition, a tendency to start breeding earlier would be normal as it would allow a greater number of clutches per season. Furthermore, the same species might present both patterns across its distribution range if it is made up of non-migrant as well as migrant populations. The Eastern Bluebird Sialia sialis shows an initial increase in the size of clutches in the southern p...

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“…To minimize observer-induced disturbance, active nests were visited each week either until the nest failed or until the young fledged (Ponz et al 1996;Rivera-Milan 1996). For each monitored nest, we reported the estimated laying date, clutch size and brood size.…”

Section: Data Collectionmentioning

confidence: 99%

Nest survival of Woodpigeons (Columba palumbus) in North African forests

Hanane

Besnard

2013

Bird Study

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Population changes and breeding ecology of the Cirl BuntingEmberiza cirlusin eastern Spain

Cited by 16 publications

References 21 publications

Are Moroccan fruit orchards suitable breeding habitats for Turtle DovesStreptopelia turtur?

Are Moroccan fruit orchards suitable breeding habitats for Turtle DovesStreptopelia turtur?

Seasonal clutch size variation of multi‐brooded bird species: comparisons between breeding season and latitudes

Nest survival of Woodpigeons (Columba palumbus) in North African forests

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