A winter feeding experiment on an island Song Sparrow population
Tóm tắt
Supplemental food, in the form of millet seed, was provided to half of an island Song Sparrow population during the 1978–1979 winter to test if winter food influenced: (1) overwinter survival; (2) winter wights; (3) breeding density in 1979 and (4) 1979 breeding performance. Territorial males were most dominant at feeders and may have restricted access of young to feeders. Young females were most subordinate at feeders. Adult survival was not affected by supplementary food, but young survival was higher than in 6 previous years and young seen to visit feeders may have survived better than young not seen at feeders. Young females were more variable in weight on the unfed half of the island than on the fed end. The breeding population increased by 38% from 1978 to 1979, but it is not known how much of this increase resulted from food addition. Pairs of birds with feeders on their territories began to lay 25 days earlier in 1979 than control pairs, but delayed longer than controls before a second breeding attempt. One-year old females began to lay significantly later than adults on the control area, but not on the fed area. Other measures of breeding performance were not affected by supplemental food. Winter food may be more important and male territorial behaviour less important than previously supposed in limiting numbers in the Mandarte Island Song Sparrow population.
Tài liệu tham khảo
Andersson M (1976) Population ecology of the long-tailed skua (Stercorarius longicaudus, Viell.). Journal of Animal Ecology 45:537–559
Dhondt AA, Eyckerman R (1979) Temperature and date of laying in tits Parus sp. Ibis 121:329–331
Flowerdew JR (1972) The effect of supplementary food on a population of wood mice (Apodemus sylvaticus). Journal of Animal Ecology 41:553–566
Fretwell SD (1969) Dominance behavior and winter habitat distributions in juncos Junco hyemalis. Bird Banding 40:1–23
Fretwell SD (1972) Populations in a seasonal environment. Princeton New Jersey, Princeton University Press
Jones PJ (1973) Some aspects of the feeding ecology of the Great Tit Parus major L. Oxford University D Phil Thesis
Källander H (1974) Advancement of laying of Great Tits by provision of food. Ibis 116:365–367
Kikkawa J (1980) Winter survival in relation to dominance classes among Silvereyes Zosterops lateralis chlorocephala of Heron Island, Great Barrier Reef. Ibis 122: in press
Klomp H (1970) The determination of clutch size in birds: a review. Ardea 58:1–124
Knapton RW (1973) Some ecological effects of social behaviour in the Song Sparrow Melospiza melodia. MSc Thesis, Vancouver BC, University of British Columbia
Knapton RW, Krebs JR: (1974) Settlement patterns, territory size and breeding density in the Song Sparrow (Melospiza melodia). Canadian Journal of Zoology 52:1413–1420
Knapton RW, Krebs JR (1976) Dominance hierarchies in winter Song Sparrows. Condor 78:567–569
Krebs CJ, Delong KT (1965) A Microtus population with supplemental food. Journal of Mammalogy 46:566–573
Krebs JR (1970) Regulation of numbers in the Great Tit (Aves: Passeriformes). Journal of Zoology (London) 162:317–333
Krebs JR (1971) Territory and breeding density in the Great Tit. Ecology 52:2–22
Lack D (1966) Population studies of birds. Clarendon Press, Oxford
Middleton ALA (1979) Influence of age and habitat on reproduction by the American Goldfinch. Ecology 60:418–432
Nice MM (1937) Studies in the life history of the Song Sparrow, I. Transactions of the Linnean Society of New York, 4:1–247
O'Connor RJ (1978) Nest box insulation and the timing of laying in the Wytham Woods population of Great Tits Parus major. Ibis 120:534–537
Perrins CM (1965) Population fluctuations and clutch size in the Great Tit, Parus major L. Journal of Animal Ecology 34:601–647
Perrins CM (1970) The timing of birds'breeding seasons. Ibis 112:242–255
Pulliam HR, Enders FH (1971) The feeding ecology of five sympatric finch species. Ecology 52:557–566
Pulliam HR, Parker TA III (1979) Population regulation of sparrows. Fortschritte der Zoologie 25:137–147
Rothstein SI (1979) Gene frequencies and selection for inhibitory traits, with special emphasis on the adaptiveness of territoriality. American Naturalist 113:317–331
Sampson FB, Lewis SJ (1979) Experiments on population regulation in two north American parids. Wilson Bulletin, 91:222–233
Smith JNM, Dhondt AA (1980) Experimental confirmation of heritable morphological variation in a natural population of Song Sparrows. Evolution 34: in press
Smith JNM, Roff DA (1980) Temporal spacing of broods, brood size and parental care in Song Sparrows. Canadian Journal of Zoology 58:1007–1015
Smith JNM, Zach R (1979) Heritability of some morphological characters in a song sparrow population. Evolution 33:460–467
Sokal RR, Rohlf FJ (1969) Biometry. The principles and practice of statistics in biological research. WH Freeman, San Francisco
Southern HN (1970) The natural control of a population of Tawny Owls (Strix aluco). Journal of Zoology (London) 162:197–285
Taitt MJ (1978) Population dynamics of Peromyscus maniculatus austerus and Microtus townsendii with supplementary food. PhD Thesis, University of British Columbia, Vancouver BC
Tompa FS (1962) Territorial behaviour: the main controlling factor of a local Song Sparrow population. Auk 79:687–697
Tompa FS (1964) Factors determining the numbers of Song Sparrows Melospiza melodia (Wilson) on Mandarte Island, BC, Canada. Acta Zoologica Fennica 109:3–73
Tompa FS (1971) Catastrophic mortality and its population consequences. Auk 88:753–759
Verner J (1977) On the adaptive significance of territoriality. American Naturalist 111:769–775
Watson A, Moss R (1970) Dominance, spacing behaviour and aggression in relation to population limitation in vertebrates. In: Animal population in relation to their food resources, Watson A (ed), 167–220. Blackwell, Oxford
Willson MF (1971) Seed selection in some North American finches. Condor 73:415–427
Yom-Tov Y (1974) The effect of food and predation on breeding density and success, clutch size and laying date of the Crow (Corvus corone L). Journal of Animal Ecology 43:479–498