This study analyzes the influence of egg laying order on egg dimensions (especially on egg volume) and on the size of the last egg laid in a Blackcap clutch. The research was carried out in deciduous woodland in NW Croatia during 2002 and 2004. The analyses covered only clutches with five eggs (the dominant size of the first clutch in the study area), where the first eggs were laid on the same day (5 May 2002 and 11 May 2004). The present study suggests that the Blackcap may employ a strategy of increasing the egg volume of each successive egg laid, which may reduce size hierarchy between nestlings and prevent competition between them.
REFERENCES
J. A. Amat
,
R. M. Fraga
,
G. M. Arroyo
2001. Intraclutch egg-size variation and offspring survival in the Kentish Plover Charadrius alexandrinus.
Ibis 143: 17–27. Google Scholar
G. T. Bancroft
1984. Patterns of variation in size Boat-tailed Grackle Quiscalus major eggs. Ibis 126: 496–510. Google Scholar
J. Bańbura
,
P. Zieliński
1995. The influence of laying sequence and ambient temperature on egg size variation in the swallow Hirundo rustica.
J. Ornithol. 136: 453–160. Google Scholar
M. Cichoń
1999. Egg weight variation in Collared Flycatchers Ficedula albicollis.
Ornis Fennica 74: 141–147. Google Scholar
Z. Dolenec
1994. Nest structure and egg-characteristic of the Blackcap Sylvia atricapilla in a region of Croatia. Vogelwarte 37: 304–305. Google Scholar
Z. Dolenec
2002. Intraclutch egg dimensions variation in the Tree Sparrow Passer montanus. Larus 48: 47–54. Google Scholar
A. Enemar
,
D. Arheimer
1999. Egg sizes of nine passerine bird species in a subalpine birch forest, Swedish Lapland. Ornis Svecica 9: 1–10. Google Scholar
S. Haftorn
1986. Clutch size, intraclutch egg size variation, and breeding strategy in the Goldcrest Regulus regulus.
J. Ornithol. 127: 291–301. Google Scholar
P. Heeb
1994. Intraclutch egg-mass variation and hatching asynchrony in the Jackdaw Corvus monedula. Ardea 82: 287–297. Google Scholar
Z. Hegyi
1996. Laying date, egg volumes and chick survival in Lapwing (Vanellus vanellus L.), Redshank (Tringa totanus L.), and Black-tailed Godwit (Limosa limosa L.). Ornis Hungarica 6: 1–7. Google Scholar
H. F. Howe
1976. Egg size, hatching asynchrony, sex, and brood reduction in the Common Grackle. Ecology 57: 1195–1207. Google Scholar
D. F. Hoyt
1979. Practical methods of estimating volume and fresh weight of bird egg. Auk 96: 73–77. Google Scholar
R. D. Magrath
1990. Hatching asynchrony in altricial birds. Biol. Rev. Cambridge Phil. Soc. 65: 587–622. Google Scholar
T. M. Murphy
1994. Breeding patterns of Estern Phoebes in Kansas: Adaptive strategies or physiological constraint? Auk 111: 617–633. Google Scholar
R. J. O'Connor
1978. Growth strategies in nestling passerines. Living Bird 16: 209–238. Google Scholar
M. Ojanen
,
M. Orel
,
R. A. Väisänen
1981. Egg size variation within passerine clutches: effects of ambient temperature and laying sequence. Ornis Fennica 58: 93–108. Google Scholar
G. Rafstadt
,
J. Sandvik
1985. Variation in egg size of the Hooded Crow Corvus corone cornix. Ornis. Scand. 16: 38–4. Google Scholar
L. Schifferli
1973. The effect of egg weight on subsequent growth of nesting Great Tits Parus major.
Ibis 115: 549–558. Google Scholar
T. Slagsvold
,
J. Sandvik
,
G. Rafstadt
,
Ö. Lorensten
,
M. Husby
1984. On the adaptive value of intraclutch egg-size variation in birds. Auk 101: 685–697. Google Scholar