Summary
Experimental pollinations of Costus allenii (Zingiberaceae) were conducted to assess the effects of pollen composition on fitness. Plants were selfed, outcrossed with the first nearest neighbor, and outcrossed with pollen mixtures obtained from the nearest 2, 3, and 5 plants. Cross type had a significant effect on seed production, seed weight and total-plant dry weight. Progeny from crosses with 3, and 5 parents grew significantly larger than selfed progeny, or those from 1-parent crosses. Competition experiments indicated the superiority of progeny from 3-, and 5-parent crosses over progeny from 1-parent crosses, but no differences in competitive ability were observed between progeny from 3-, and 5-parent crosses. Relative fitness, based on 1) seed production, 2) percent germination, and 3) dry weight, varied significantly among crosses, and was greatest for crosses with 3 parents and lowest for selfs. The relative fitness of progeny from 5-parent crosses was lower than that of all other outcrossed classes. We suggest that the significant effect of pollen composition on fitness results from variation in the genetic similarity of seed and pollen parents, which is a function of spatial distribution and population structure.
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References
Antonovics J (1968) Evolution in closely adjacent plant populations. V Evolution of self-fertility. Heredity 23:219–238
Bawa KS, Webb CJ Flower, fruit, and seed abortion in tropical forest trees: Implications for the evolution of paternal and maternal reproductive patterns. (ms)
Beattie AJ, Culver DC (1979) Neighborhood size in Viola. Evolution 33:1225–1229
Croat TB (1978) Flora of Barro Colorado Island. Stanford University Press, Stanford, California
Dixon WJ (1981). BMDP biomedical computer programs. Univ of California Press, Los Angeles
Endler JA (1977) Geographic variation, speciation and clines. Princeton University Press, Princeton, New Jersey
Foster RB, Brokaw N (1983) The vegetation of Barro Colorado Island. In: Leigh EG (ed) Seasonal rhythms in a tropical forest. Smithsonian Institution Press, Washington, DC
Gorla MS, Ottaviano E, Faini D (1975) Genetic variability of gametophyte growth rate in maize. Theor Appl Genet 46:289–294
Harper JL (1977) Population biology of plants. Academic Press, New York, New York
Jain SK, Bradshaw AD (1966) Evolutionary divergence among adjacent plant populations. I. The evidence and its theoretical analysis. Heredity 21:407–441
Janzen DH (1977) A note on optimal mate selection by plants. Am Nat 111:365–371
Janzen DH, DeVries P, Gladstone DE, Higgins ML, Lewinsohn TM (1980) Self- and cross-pollination of Encylica cordigera (Orchidaceae) in Santa Rosa National Park, Costa Rica. Biotropica 12:72–74
Kiester AR, Lande R, Schemske DW Models of coevolution in plants and their pollinators. Am Nat (in press)
Kruckeberg AR (1957) Variation in fertility of hybrids between isolated populations of the serpentine species Streptanthus glandulosus. Hook. Evolution 11:185–211
Lee TD, Bazzaz FA (1982) Regulation of fruit maturation pattern in an annual legume, Cassia fasciculata. Ecology 63:1374–1388
Levin DA (1981) Dispersal versus gene flow in plants. Ann Mo Bot Gard 68:233–253
Levin DA, Kerster HW (1974) Gene flow in seed plants. Evol Biol 7:139–220
Maas PJM (1972) Costoideae (Zingiberaceae). Flora Neotropica, monograph no 8. Hafner, New York, New York
Mulcahy DL (1979) Rise of the angiosperms: A genecological factor. Science 206:20–23
Mulcahy DL, Mulcahy GB (1975) The influence of gametophytic competition on sporophytic quality in Dianthus chinensis. Theor Appl Genet 46:277–280
Ottaviano E, Gorla MS, Arenari I (1983) Male gametophytic competitive ability in maize selection and implications with regard to the breeding system, pp 367–373. In: Mulcahy DL, Ottaviano E (eds) Pollen: Biology and Implications for Plant Breeding. Elsevier Press, New York, New York
Ottaviano E, Gorla MS, Mulcahy DL (1980) Pollen tube growth rates in Zea mays: Implications for genetic improvement of crops. Science 210:437–438
Pfahler PL (1967) Fertilization ability of maize pollen grains. II. Pollen genotype, female sporophyte, and pollen storage interactions. Genetics 57:513–521
Price MV, Waser NM (1979) Pollen dispersal and optimal outcrossing in Delphinium nelsoni. Nature 277:294–297
Price MV, Waser NM (1982) Experimental studies of pollen carryover: Hummingbirds and Ipomopsis aggregata. Oecologia (Berlin) 54:353–358
SAS Institute Inc 1982. SAS User's Guide: Statistics. Cary, North Carolina
Schemske DW (1981) Floral convergence and pollinator sharing in two bee-pollinated tropical herbs. Ecology 62:946–954
Schemske DW (1982) Ecological correlates of a neotropical mutualism: Ant assemblages at Costus extrafloral nectaries. Ecology 63:932–941
Schemske DW (1983a) Breeding system and habitat effects on fitness components in three neotropical Costus (Zingiberaceae). Evolution 37:523–539
Schemske DW (1983b) Limits to specialization and coevolution in plant-animal mutualisms, In: Nitecki MH (ed) Coevolution, University of Chicago Press, Chicago, pp 67–109
Schemske DW (1984) Population structure and local selection in Impatiens pallida (Balsaminaceae), a selfing annual. Evolution (in press)
Schemske DW, Fenster C (1983) Pollen-grain interactions in a neotropical Costus: Effects of clump size and competitors, In: Mulcahy DL, Ottaviano E (eds) Pollen: Biology and Implications for Plant Breeding. Elsevier Press, New York, New York, pp 405–410
Schmitt J (1980) Pollinator foraging behavior and gene dispersal in Senecio (Compositae). Evolution 34:934–943
Schoen DJ (1983) Relative fitnesses of selfed and outcrossed progeny in Gilia achilleifolia (Polemoniaceae). Evolution 37:292–301
Siegel S (1956) Nonparametric statistics for the behavioral sciences. McGraw-Hill, New York
Thomson JD, Plowright RC (1980) Pollen carryover, nectar rewards, and pollinator behavior with special reference to Diervilla lonicera. Oecologia (Berlin) 46:68–74
Waser NM (1982) A comparison of distances flown by different visitors to flowers of the same species. Oecologia (Berlin) 55:251–257
Weil J, Allard RW (1964) The mating system and genetic variability in natural populations of Collinsia heterophylla. Evolution 18:515–525
Wit CT de (1960) On competition. Versl Landbouwk. Onderz 66:1–82
Zimmerman M (1982) The effect of nectar production on neighborhood size. Oecologia (Berlin) 52:104–108
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Schemske, D.W., Pautler, L.P. The effects of pollen composition on fitness components in a neotropical herb. Oecologia 62, 31–36 (1984). https://doi.org/10.1007/BF00377369
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DOI: https://doi.org/10.1007/BF00377369