Fat and weight variations of blackcaps wintering in Southern Spain

Cuadrado, Mariano; Rodríguez, Manuel Jesús López; Arjona, Salvador

doi:10.1080/03078698.1989.9673945

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…Time of day and mean minimum temperature during the days immediately preceding capture were the only variables significantly related to fat deposition scores in both Sylvia atricapilla and Erithacus rubecula (see Ioalé and Benvenuti [1982] and Cuadrado et al [1989] for further data on daily variation in fat deposition in these species). No evidence was found, however, in support of this hypothesis.…”

Section: Consequences For Birds and Plantsmentioning

confidence: 99%

“…No evidence was found, however, in support of this hypothesis. Time of day and mean minimum temperature during the days immediately preceding capture were the only variables significantly related to fat deposition scores in both Sylvia atricapilla and Erithacus rubecula (see Ioalé and Benvenuti [1982] and Cuadrado et al [1989] for further data on daily variation in fat deposition in these species). After statistically controlling for the effects of these variables, there was no annual variation in fat deposition scores and no effect of the percentage of fruit volume in the diet.…”

Section: Consequences For Birds and Plantsmentioning

confidence: 99%

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Long-Term Dynamics of Mediterranean Frugivorous Birds and Fleshy Fruits: A 12-Year Study

Herrera¹

1998

Ecological Monographs

193

292

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The relationship between fleshy-fruited plants and their vertebrate seed dispersal agents often has been depicted as subject to important interannual variation, but no study has thus far documented such variation on a long-term basis. This paper presents the results of a 12-yr investigation on fleshy-fruited plants and avian frugivores in a Mediterranean montane locality of southeastern Spain. The main objective was to document patterns and correlates of long-term variation in the composition and abundance of fruits and birds, with particular reference to seed dispersers. During October-December (''autumn'' period) 1978, abundance of ripe fruits and birds was assessed in a 4-ha plot in dense, well-preserved sclerophyllous scrub, by means of counts in permanent plots and mist-netting, respectively. Diet composition and fruit preference patterns of Erithacus rubecula and Sylvia atricapilla, the two most abundant seed dispersers, were also investigated over the same period, using fecal sample analyses. Possible consequences to the birds of annual variation in fruit supply and diet composition were investigated using data on fat deposition levels and recapture rates of mist-netted individuals.Total fruit abundance (i.e., mean ripe fruit density of all species combined) fluctuated among years between 5.4 Ϯ 11.1 fruits/m 2 (mean Ϯ 1 SD; 1986) and 77.1 Ϯ 78.0 fruits/m 2 (1989) and was positively related to the amount of rainfall in the preceding spring. Not all fruiting species bore ripe fruits every year, and among those species that did, fruit density fluctuated asynchronously and to variable degrees. Seven out of 13 species exhibited significant supra-annual periodicity in fruit abundance, with fluctuation periods ranging from 2 to 6 yr. Variation in the abundance of each of the six most abundant fruit species was unrelated to annual variation in rainfall. The autumn bird assemblage at the study site was made up of year-round resident species (54.1% of captures, all years combined) that were largely fruit predators (feeding on pulp or seeds without performing dispersal) and of autumn-winter resident species (45.5% of captures) that were largely seed dispersers. Bird abundance, all species combined, ranged between 27.1 and 61.5 captures/100 net-hours for 1987 and 1986, respectively. Depending on year, seed dispersers made up 25.6-75.4% of the total captures, and fruit predators made up 20.9-69.7%. The relative importance of nonfrugivores was always negligible (1.1-9.9%). No correlation existed across years between total fruit abundance and the capture rates of all bird species combined, seed dispersers, or fruit predators. Annual variation in the abundance of seed dispersers was positively related to November mean maximum temperature. At the individual species level, S. atricapilla capture rates were correlated with the abundance of the fruits of Phillyrea latifolia, a species exhibiting extreme annual fluctuations.Annual variation in the importance of fruits in the diet of S. atricapilla and E. rubecula was not signi...

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Section: Consequences For Birds and Plantsmentioning

confidence: 99%

Section: Consequences For Birds and Plantsmentioning

confidence: 99%

Long-Term Dynamics of Mediterranean Frugivorous Birds and Fleshy Fruits: A 12-Year Study

Herrera¹

1998

Ecological Monographs

193

292

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“…Foreign first ringed Blackcaps were not considered. To exclude birds probably ringed or recovered whilst still on migration (see Murillo & Sancho 1969) I consider a recovery to belong to an over-wintering Blackcap if both ringing and recovery dates occurred between 1 November and 28 February (see also Cuadrado et al 1989) and to a resident if ringing and/or recovery occurred between 1 May and 31 August). These selected recoveries were then classified according to (1) site fidelity: as local recovery (if both places were the same, distance = 0 km) or non-local recovery (if both places were different, distance > 0 km); and (2) the number of years elapsed between first ringing and last recovery, in first year recovery (if time was in between 180 days and 540 days), second year recovery (540 days and 900 days) and so on.…”

mentioning

confidence: 99%

Site‐tenacity and life‐time expectancy of resident and over‐wintering BlackcapsSylvia atricapillain the Mediterranean

Cuadrado¹

1994

Ringing & Migration

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Sexual size dimorphism and determination of sex in the Chough (Pyrrhocorax pyrrhocorax)

Tella

Torre

1993

J Ornithol

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Fat and weight variations of blackcaps wintering in Southern Spain

Cited by 8 publications

References 30 publications

Long-Term Dynamics of Mediterranean Frugivorous Birds and Fleshy Fruits: A 12-Year Study

Long-Term Dynamics of Mediterranean Frugivorous Birds and Fleshy Fruits: A 12-Year Study

Site‐tenacity and life‐time expectancy of resident and over‐wintering BlackcapsSylvia atricapillain the Mediterranean

Sexual size dimorphism and determination of sex in the Chough (Pyrrhocorax pyrrhocorax)

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