Abstract
Effective mating in plant populations need not occur during periods of peak pollinator activity and flowering. We measured seasonal and diurnal patterns of pollinator activity, pollen and ovule availability, and seed production in an experimental population of Raphanus sativus to infer the times of reproductively effective mating. On a seasonal scale, we found that most “effective matings”, those resulting in mature seeds, occurred very early in the season, well before the peak of flowering and pollinator activity. At a finer scale, diurnal schedules of flower opening, stigma saturation with pollen, and pollen removal indicated that most effective matings occurred before noon, even though pollinator activity increased later in the day. These patterns may be most common in populations that are not pollen limited, but other ecological factors (e.g. seed predation, resource depletion) could weaken the correspondence between pollination and effective mating.
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References
Ashman T-L, Stanton ML (1991) Seasonal variation in pollination dynamics of sexually dimorphic Sidalcea oregana ssp. spicata (Malvaceae). Ecology 72: 993–1003
Broyles SB, Wyatt R (1991) Paternity analysis in a natural population of Asclepias exalata: Multiple paternity, functional gender and the “pollen-donation hypothesis”. Evolution 44: 1454–1468
Campbell DR, Waser NM, Price MV, Lynch EA, Mitchell RJ (1991) Components of phenotypic selection: pollen export and corolla width in Ipomopsis aggregata. Evolution 45: 1458–1467
Cruden RW, Hermann-Parker SM (1977) Temporal dioecism: an alternative to dioecism? Evolution 31: 863–866
Cruzan MB, Neal PR, Willson MF (1988) Floral display in Phyla incisa: consequences for male and female reproductive success. Evolution 45: 505–515
DeJong TJ, Klinkhamer PGL (1991) Early flowering in Cynoglossum officinale L. constraint or adaptation? Func Ecol 5: 750–756
Devlin B, Ellstrand NC (1990) Male and female fertility variation in wild radish, a hermaphrodite. Am Nat 136: 87–107
Devlin B, Stephenson AG (1987) Sexual variations among plants of a perfect flowered species. Am Nat 130: 199–218
Ellstrand NC (1984) Multiple paternity with in the fruits of the wild radish, Raphanus sativus. Am Nat 123: 819–828
Hainsworth FR, Wolf LL, Mercier T (1984) Pollination and predispersal seed predation: net effects on reproduction and inflorescence characteristics in Ipomopsis aggregata. Oecologia 63: 405–409
Hurd PD, LaBerge WE, Linsley EG (1980) Principal sunflower bees of North America with emphasis on the southwestern U.S. (Hymenoptera: Apoidea). Smith Cont Zool 310: 1–158
Jennersten O, Berg L, Lehman C (1988) Phenological differences in pollinator visitation, pollen deposition and seed set in the sticky catchfly, Viscaria vulgaris. J Ecol 76: 1111–1132
Kevan PG, Lack AJ (1985) Pollination in a cryptically dioecious plant Decaspermum parviflorum (Lam.) A.J. Scott (Myrtaceae) by pollen-collecting bees in Sulawesi, Indonesia. Biol J Linn Soc 25: 319–330
Lee TD (1988) Patterns of fruit and seed production. In: Lovett-Doust J, Lovett-Doust L (eds) Plant Reproductive Ecology: Patterns and Strategies. Oxford University Press, New York. pp 179–202
Linsley EG, MacSwain JW, Raven PH, Thorp. RW (1973) Comparative behavior of bees and Onagraceae. V. Camisonia and Oenothera bees of cismontain California and Baja California. Univ Cal Pub Ent 71: 1–68
Lloyd DG, Webb C (1986) The avoidance of interference between the presentation of pollen and stigmas in angiosperms. I. Dichogamy. N Z J Bot 24: 135–62
MacSwain JW, Raven PH, Thorp RW (1973) Comparative behavior of bees and Onagraceae. IV. Clarkia bees of the Western United States. Univ Cal Publ Ent 70: 1–80
Mazer SJ, Nakamura RR, Stanton ML (1989) Seasonal changes in components of male and female reproductive success in Raphanus sativus L. (Brassicaeae). Oecologia 81: 345–353
Meagher TR (1991) Analysis of paternity within a natural population of Chamaelirium luteum. II Patterns of male reproductive success. Am Nat 137: 738–752
Molau U, Eriksen B, Knudsen JT (1989) Predispersal seed predation in Bartsia alpina. Oecologia 81: 181–185
Motten AF, Campbell DR, Alexander DE (1981) Pollination effectiveness of specialist and generalist visitors to a North Carolina population of Claytonia virqinica. Ecology 62: 1278–1287
Mulcahy DL, Curtis PS, Snow AA (1983) Pollen competition in a natural population. In: Jones CE, Little RJ (eds) Handbook of Experimental Pollination Biology. Van Nostrand Reinhold Company, Inc. N.Y. pp 330–337
Olesen JM, Warncke E (1989) Flowering and seasonal changes in flower sex ratio and frequency of flower visitors in a population of Saxifraga hirculus. Hol Ecol 12: 21–30
Petterson MW (1991) Flower herbivory and seed predation in Silene vulgaris (Caryophyllaceae): effects of pollination and phenology. Hol Ecol 14: 45–50
Potvin C, Lechowicz MJ, Tardif S (1990) The statistical analysis of ecophysiological response curves obtained from experiments involving repeated measures. Ecology 71: 1389–1400
Real LA (1981) Nectar availability and bee-foraging on Ipomoea (Convolvulaceae). Repro Bot 1981: 64–69
Rodriguez-Robles JA, Melendez EJ, Ackerman JD (1992) Effects of display size, flowering phenology, and nectar availability on effective visitation frequency in Comparettia flacata (Orchidaceae). A J Bot 79: 1009–1017
SAS Institute, Inc. 1988. SAS Procedures Guide, Release 6.03 Edition. SAS Institute. Cary, North Carolina
Schemske DW, Willson MF, Melampy MN, Miller LJ, Verner L, Schemske KM, Best LB (1978) Flowering ecology of some spring woodland herbs. Ecology 59: 351–366
Stanton ML (1987a) The reproductive biology of petal color variants in wild populations of Raphanus sativus L.: I. Pollinator response to color morphs. Am J Bot 74: 178–187
Stanton ML (1987b) The reproductive biology of petal color variants in wild populations of Raphanus sativus L.: II. Factors limiting seed production. Am J Bot 74: 188–196
Stanton ML, Preston RE (1988) Ecological consequences and phenotypic correlates of petal size variation in wild radish, Raphanus sativus (Brassicaeae). Am J Bot 75: 528–539
Stanton ML, Ashman T-L, Galloway LF, Young HJ (1992) Estimating male fitness of plants in natural populations. In Wyatt R (ed) Ecology and Evolution of Plant Reproduction: New Approaches. Chapman and Hall, N.Y. pp 62–90
Stephenson AG (1981) Flower and fruit abortion: proximate causes and ultimate functions. Ann Rev Ecol Syst 12: 253–279
Sutherland S, Delph LF (1984) On the importance of male fitness in plants: patterns of fruit set. Ecology 65: 1093–1104
Thomson JD, McKenna MA, Cruzan MB (1989) Temporal patterns of nectar and pollen production in Aralia hispid: Implications for reproductive success. Ecology 70: 1061–1068
Thomson JD, Thomson BA (1989) Dispersal of Erythronium grandiflorum pollen by bumblebees: Implications for gene flow and reproductive success. Evolution 43: 657–662
Willson MF, Rathcke BJ (1974) Adaptive design of the floral display in Asclepias syriaca L. Am Midl Nat 92: 47–57
Winer BJ, Brown DR, Michels KM (1993) Statistical Principles in Experimental Design. McGraw-Hill, Inc. New York
Young HJ, Stanton ML (1990) Influences of floral variation on pollen removal and seed production in wild radish. Ecology 71: 536–547
Zimmerman M (1980a) Reproduction in Polemonium: Competition for pollinators. Ecology 61: 497–501
Zimmerman M (1980b) Reproduction in Polemonium: Pre-dispersal seed predation. Ecology 61: 502–506
Zimmerman M (1988) Nectar production, flowering phenology and strategies for pollination. In: Lovett-Doust J, Lovett-Doust L (eds) Plant Reproductive Ecology: Patterns and Strategies. Oxford University Press, New York. pp 157–178
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Ashman, TL., Galloway, L.F. & Stanton, M.L. Apparent vs. effective mating in an experimental population of Raphanus sativus . Oecologia 96, 102–107 (1993). https://doi.org/10.1007/BF00318036
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DOI: https://doi.org/10.1007/BF00318036