Summary
Differences in major selective forces important in early and late successional communities should influence niche breadth and degree of overlap. Early successional species may not experience consistent, strong selection against competition and can be expected to have broader niches with more overlap than later successional species. This paper presents data from 2 early successional winter annuals that show clear niche separation under conditions in which coevolution is unlikely.
Lactuca scariola L. and Erigeron annuus (L.) Pers. flower in mid-summer and attract the same insect visitors. Erigeron, the more common species, begins to flower in mid-morning when insect visitors are quite active. Lactuca flowers open earlier in the morning and close just before Erigeron flowers open. The early morning hours are not optimum for Lactuca visitation, as most of the visits occur just before floral closing. Both species can selffertilize without a vector, and Lactuca was introduced from Europe. It is, therefore, not possible that niche separation inflowering time and subsequent time of visit in Erigeron and Lactuca is a result of coevolutionary niche differentiation between the two species. This separation is likely to be a preadaptation resulting from coevolution with other species.
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References
Allard, R.W.: Genetic systems associated with colonizing ability in predominantly self-pollinated species. In: Genetics of colonizing species (H.G. Baker, G.L. Stebbins, eds.), pp. 46–76. New York: Academic Press 1965
Baker, H.G.: Characteristics and modes of origin of weeds. In: Genetics of colonizing species (H.G. Baker, G.L. Stebbins, eds.), pp. 147–168. New York: Academic Press 1965
Baker, H.G.: The evolution of weeds. Ann. Rev. Ecol. Syst. 5, 1–24 (1974)
Beattie, A.J.: A technique for the study of insect-borne pollen. The Pan-Pac. Ent. 47, 82 (1971)
Clauser, G.: Die Kopfur. Stuttgart: Enke 1954
Estes, J.R., Thorp, R.W.: Pollination ecology of Pyrrhopappus carolinianus (Compositae). Am. J. Bot. 62, 148–159 (1975)
Galil, J., Eisekovitch, D.: On the pollination ecology of Ficus sycamorus in East Africa. Ecology 49, 259–269 (1968)
Kullenberg, B.: Studies in Ophrys pollination. Zool. Bidrag. Uppsala 34, 1–340 (1961)
Levin, D.A., Berube, D.E.: Phlox and Colias: the efficiency of a pollination system. Evolution 26, 242–250 (1972)
Levins, R.: Evolution in changing environments, 120 pp. Princeton: Princeton Univ. Press 1968
Linneaus, C.: Somnus plantarum. Amoenitat. Acad. 4, 333 (1755)
Macior, L.W.: Pollination adaptation in Pedicularis groenlandica. Am. J. Bot. 57, 927–932 (1968)
MacArthur, R.H., Wilson, E.O.: The theory of island biogeography, 203 pp. Princeton, N.J.: Princeton Univ. Press 1967
Mulligan, G.A., Findlay, J.: Reproductive systems and colonization in Canadian weeds. Can. J. Bot. 48, 859–860 (1970)
Parrish, J.A.D., Bazzaz, F.A.: Niche separation in roots of successional plants. Ecology 57, 1281–1288 (1976)
Parrish, J.A.D., Bazzaz, F.A.: α-niche relationships along a successional gradient. Ecology (submitted, 1978)
Pianka, E.R.: Sympatry of desert lizards (Ctenotus) in Western Australia. Ecology 50, 1012–1030 (1969)
Pickett, S.T.A., Bazzaz, F.A.: Divergence of two co-occurring successional annuals on a soil moisture gradient. Ecology 57, 169–176 (1976)
Pickett, S.T.A., Bazzaz, F.A.: Organization of an assemblage of early successional species on a soil moisture gradient. Ecology (in press, 1978)
Pijl, L. van der, Dodson, C.: Orchid flowers. Their pollination and evolution. Coral Gables: Univ. Miami Press 1966
Powell, J.A., Mackie, R.A.: Biological interrelationships of moths and Yucca whipplei. Univ. California Publ. Ent. 42 (1966)
Solbrig, O.T.: Breeding system and genetic variation in Leavenworthia. Evolution 26, 155–160 (1972)
Solbrig, O.T.: On the relative advantages of cross-and self-fertilization. Ann. Mo. Bot. Gard. 63, 262–276 (1976)
Stebbins, G.L.: Adaptive radiation and reproductive characteristics in Angiopserms, I: Pollination mechanisms. Ann. Rev. Ecol. 1, 307–326 (1970)
Werner, P.A., Platt, W.J.: Ecological relationships of co-occurring goldenrods (Solidago: Compositae). Am. Nat. 110, 959–971 (1976)
Wieland, N.K., Bazzaz, F.A.: Physiological ecology of three codominant successional annuals. Ecology 56, 681–688 (1975)
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Parrish, J.A.D., Bazzaz, F.A. Pollination niche separation in a winter annual community. Oecologia 35, 133–140 (1978). https://doi.org/10.1007/BF00344726
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DOI: https://doi.org/10.1007/BF00344726