Summary
Milkweed (Asclepias syriaca L.) umbels and stems attended by ants (Lasius neoniger Emery and Tapinoma sessile (Say)) initiated significantly fewer pods and showed a trend to produce fewer mature pods than did umbels and stems not attended by ants. Since similar numbers of pollinia were inserted in ant-attended flowers, we hypothesize that ant-excluded flowers obtain more pollinia from other clones than do ant-attended flowers of this normally non-selfing species. If pollinators from other clones first visited flowers not depleted of nectar by ants, they could provide this source of foreign pollinia. Our experiments suggest that nocturnal noctuid and geometrid moths can provide these pollinia.
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References
Bertin RI, Willson MF (1980) Effectiveness of diurnal and nocturnal pollination of two milkweeds. Can J Bot 58:1744–1746
Brantjes NBM (1976) Riddles around the pollination of Melandrium album (Mill.) Garcke (Caryophyllaceae) during the oviposition by Hadena bicruris Hufn, (Noctuidae, Lepidoptera). I. Proceedings K. Nederlandse Akademie van Wetenschappen, Ser C 79:125–141
Brantjes NBM (1978) Sensory responses to flowers in night-flying moths. Linn Soc Symp Ser 6:13–19
Faegri K, van der Piil L (1979) The principles of pollination biology. Pergamon Press, Toronto
Galil J, Zeroni M (1965) Nectar system of Asclepias curassavica. Bot Gaz 130:1–4
Heinrich B, Raven PH (1972) Energetics and pollination ecology. Science 176:597–602
Inouye DW (1981) The ecology of nectar robbing. In: TS Elias and BL Bentley (eds) The biology of nectaries. Columbia University Press, New York. (in press)
Lynch SP (1977) The floral ecology of Asclepias solanoana Woods. Madroño 24:159–177
Morse DH (1981) Modification of bumble bee foraging: the effect of milkweed pollinia. Ecology 62:89–97
Morse DH: Patterns of pollinia accretion and loss on bumble bees. In preparation
Proctor M, Yeo P (1973) The pollination of flowers. Taplinger Publ Co, New York
Sparrow FK, Pearson NL (1948) Pollen compatability in Asclepias syriaca. J Agric Res 77:187–199
Willson MF, Bertin RI (1979) Flower visitors, nectar production, and infloresence size of Asclepias syriaca. L. Can J Bot 57:1380–1388
Willson MF, Price PW (1977) The evolution of infloresence size in Asclepias (Asclepiadaceae). Evolution 31:495–511
Willson MF, Price PW (1980) Resource limitation of fruit and seed production in some Asclepias species. Can J Bot 58:2229–2233
Willson MF, Rathke BJ (1974) Adaptive design of the floral display in Asclepias syriaca L. Am Midl Nat 92:47–57
Wyatt R (1976) Pollination and fruit-set in Asclepias: a reappraisal. Am J Bot 63:845–851
Wyatt R (1979) Experimental evidence concerning the role of the corpusculum in Asclepias pollination. Syst Bot 3:313–321
Wyatt R (1980) The impact of nectar-robbing ants on the pollination system of Asclepias curassavica. Bull Torrey Bot Club 107:24–28
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Fritz, R.S., Morse, D.H. Nectar parasitism of Asclepias syriaca by ants: Effect on nectar levels, pollinia insertion, pollinaria removal and pod production. Oecologia 50, 316–319 (1981). https://doi.org/10.1007/BF00344969
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DOI: https://doi.org/10.1007/BF00344969