This paper reports on the case of selection, due to influence of bad weather on nestling number, acting through different pathways on breeding date and morphological traits in breeding Great Tits. Multiple regression of relative fitness on tarsus length, bill height and forearm length, revealed significant phenotypic selection on male forearm length and female bill height. However, nestling mortality during the bad weather depended on their age, which suggested breeding date as a focal trait for selection. The multiple regression analysis of relative fitness on both body traits and hatching date shows that in males only breeding date was significantly related to fitness, and selection on forearm resulted from correlation of forearm with hatching date. A similar analysis in females shows that both bill height and timing of hatching were equally related to fitness, therefore in this sex both bill height and date of hatching were focal traits for selection.
REFERENCES
R. V. Alatalo
,
L. Gustafsson
,
A. Lundberg
1990. Phenotypic selection on heritable size traits: environmental variance and genetic response. Am. Nat. 135: 464–471. Google Scholar
S. J. Arnold
,
M. J. Wade
1984a. On the measurement of natural and sexual selection: theory. Evolution 38: 709–719. Google Scholar
S. J. Arnold
,
M. J. Wade
1984b. On the measurement of natural and sexual selection: applications. Evolution 38: 720–734. Google Scholar
E. Bandoła-Ciołczyk
,
Z. Witkowski
1976. Energy flow through oak leaves and caterpillars feeding on them in an oakhornbeam ecosystem of the Niepołomice Forest (IBP Project “Ispina”). Bull, de L'Acad. Pol. Sci. 24: 385–392. Google Scholar
M. Cichoń
,
M. Linden
1995. The timing of breeding and offspring size in Great Tit Parus major.
Ibis 137: 364–370. Google Scholar
J. K. Conner
1996. Understanding natural selection: an approach integrating selection gradients, multiplicative fitness components, and path analysis. Ethol., Ecol. & Evol. 8: 387–397. Google Scholar
C. Darwin
1913. The descent of man and selection in relation to sex. 2nd ed., J. Murray, London. Google Scholar
A. A. Dhondt
,
R. Eyckerman
,
J. Huble
1979. Will Great Tits become Little Tits? Biol. J. Linn. Soc. 11: 289–294. Google Scholar
J. A. Endler
1986. Natural selection in the wild. Monogr. Population Biol. 21, Princeton: Princeton Univ. Press. Google Scholar
R. A. Fisher
1958. The genetical theory of natural selection. 2nd ed. Dover Publ., New York. Google Scholar
A. G. Gosler
1987. Pattern and process in the bill morphology of the Great Tit Parus major.
Ibis 129: 451–476. Google Scholar
B. R. Grant
,
P. R. Grant
1993. Evolution of Darwin's finches caused by a rare climatic event. Proc. Royal Soc. London 251: 111–117. Google Scholar
D. G. C. Harper
1994. Some comments on the repeatability of measurements. Ringing & Migration 15: 84–90. Google Scholar
W. Hochachka
1990. Seasonal decline in reproductive performance of Song Sparrows. Ecology 71: 1279–1288. Google Scholar
P. Hõrak
,
R. Mand
,
I. Ots
1997. Identifying targets of selection: a multivariate analysis of reproductive traits in the great tit. Oikos 78: 592–600. Google Scholar
J. R. Krebs
1971. Territory and breeding density in the Great Tit (Parus major L.). Ecology 52: 1–22. Google Scholar
J. Lemel
1989. Habitat distribution in the Great Tit Parus major in relation to reproductive success, dominance, and biometry. Ornis Scand. 20: 226–233. Google Scholar
J. A. L. Mertens
1977. Thermal conditions for successful breeding in Great Tit (Parus major L.) I. Relation of growth and development of temperature regulation in nestling Great Tits. Oecologia 28: 1–29. Google Scholar
D. H. Morse
1974. Niche breadth as a function of social dominance. Am. Nat. 108: 818–827. Google Scholar
A. van Noordwijk
,
J. H. van Balen
,
J. M. Tinbergen
1988. Heritability of body size in a natural population of the great tit Parus major and its relation to age and environmental conditions during growth. Genetic. Research 51: 149–162. Google Scholar
C. M. Perrins
,
R. H. McCleery
1989. Laying dates and clutch size in the great tit. Willson Bull. 101: 236–253. Google Scholar
T. Price
,
M. Kirkpatrick
,
S. J. Arnold
1988. Directional selection and the evolution of breeding date in birds. Science 24: 798–799. Google Scholar
T. Price
,
L. Liou
1989. Selection on clutch size in birds. Am. Nat. 134: 950–959. Google Scholar
L. Rowe
,
D. Ludwig
,
D. Schluter
1994. Time, condition, and the seasonal decline of avian clutch size. Am. Nat. 143: 698–722. Google Scholar
B. C. Sheldon
,
H. Ellegren
1999. Sexual selection resulting from extrapair paternity in collared flycatchers. Anim. Behav. 57: 285–298. Google Scholar
L. Svensson
1992. Identification guide to european passerines. 4th ed., L. Svensson, Stockholm. Google Scholar
S. Verhulst
,
J. M. Tinbergen
1991. Experimental evidence for a causal relationship between timing and success of reproduction in the Great Tit Parus m. major.
J. Anim. Ecol. 60: 269–282. Google Scholar
D. A. Wiggins
,
T. Pärt
,
L. Gustafsson
1994. Seasonal decline in Collared Flycatcher Ficedula albicollis reproductive success: an experimental approach. Oikos 70: 359–364. Google Scholar
T. Zając
1995. Selection on laying date in the Blue Tit Parus caeruleus and the Great Tit Parus major caused by weather conditions. Acta Ornithol. 30: 145–151. Google Scholar
T. Zając
1999. Phenotypic selection on body size in the Great Tit Parus major (Niepołomice Forest, Poland). Acta Ornithol. 34: 219–226. Google Scholar
