Pollination of Oncocyclus irises (Iris: Iridaceae) by Night-Sheltering Male Bees

Y. Sapir; A. Shmida; G. Ne'eman

doi:10.1055/s-2005-837709

Plant Biology, Inhaltsverzeichnis

Plant Biol (Stuttg) 2005; 7(4): 417-424
DOI: 10.1055/s-2005-837709

Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Pollination of Oncocyclus irises (Iris: Iridaceae) by Night-Sheltering Male Bees

Y. Sapir¹ ^, ³ , A. Shmida¹ , G. Ne'eman²

¹Department of Evolution, Systematics and Ecology, The Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel
²Dept. of Biology, University of Haifa-Oranim, Tivon, 36006, Israel
³Present address: Dept. of Biology, Indiana University, Bloomington, IN, 47405, USA

Abstract

Irises in the section Oncocyclus (Siems.) Baker (Iris: Iridaceae) grow throughout the Middle East and have large and dark-coloured flowers but no nectar reward available to flower visitors. Consequently, no reward-collecting pollinators have been observed visiting the flowers during daytime. The only visitors are solitary male bees (Eucera spp.: Apidae) that enter the flowers at dusk and stay there overnight. Here we describe the mating system of Oncocyclus irises, and the role of night-sheltering male bees in their pollination system. Pollen viability in I. haynei on Mt. Gilboa was very high (> 90 %) throughout all floral life stages. Stigmas were receptive in buds and in open flowers, but not in older ones. Self-pollination yielded no fruits in three species, confirming complete self-incompatibility in Oncocyclus irises. On average, 1.9 flowers were visited by each male bee before it settled for the night in the last one. Moreover, Iris pollen was present on the dorsal side of 38.8 % of males caught sheltering in flower models mounted near an I. atrofusca population, indicating that pollen is transferred between flowers by night-sheltering solitary male bees. We have surveyed 13 flowering populations of six Oncocyclus species for the presence of night-sheltering male bees as well as for fruit set. We found a positive correlation, indicating that sexual reproduction in Oncocyclus irises is dependent on night-sheltering solitary male bees. Based on their complete self-incompatibility, the absence of nectar-collecting visitors during the day, and the transfer of pollen grains by the night-sheltering solitary male bees, we conclude that fertilization of Oncocyclus irises is totally dependent on pollination by night-sheltering solitary male bees.

Key words

Bee pollination - clonal plants - geitonogamy - mating system - night-sheltering - self-incompatibility - solitary bees.

Volltext

Referenzen

References

1 Arafeh R. M. H., Sapir Y., Shmida A., Iraki N., Fragman O., Comes H. P.. Patterns of genetic and phenotypic variation in Iris haynei and I. atrofusca (Iris sect. Oncocyclus = the Royal Irises) along an environmental gradient in Israel and the West Bank. Molecular Ecology. (2002); 11 39-53
2 Avishai M.. Species relationships and cytogenetic affinities in section Oncocyclus of the genus Iris. PhD thesis, The Hebrew University of Jerusalem. (1977)
3 Avishai M., Zohary D.. Genetic affinities among the Oncocyclus Irises. Botanical Gazette. (1980); 141 107-115
4 Barrett S. C. H., Harder L. D., Worley A. C.. The comparative biology of pollination and mating in flowering plants. Philosophical Transactions of the Royal Society of London B. (1996); 351 1271-1280
5 Charlesworth D., Charlesworth B.. Inbreeding depression and its evolutionary consequences. Annual Review of Ecology and Systematics. (1987); 18 237-268
6 Conner J. K., Rush S.. Effects of flower size and number on pollinator visitation to wild radish, Raphanus raphanistrum. . Oecologia. (1996); 105 509-516
7 Dafni A., Ivri Y., Brantjes N. B. M.. Pollination of Serapias vomeracea Briq. (Orchidaceae) by imitation of holes for sleeping solitary male bees (Hymenoptera). Acta Botanica Neerlandica. (1981); 30 69-73
8 Danforth B. N., Neff J. L.. Male polymorphism and polyethism in Perdita texana (Hymenoptera, Andrenidae). Annals of the Entomological Society of America. (1992); 85 616-626
9 Faegri K., van der Pijl L.. The Principles of Pollination Ecology. 3rd edition. Oxford; Pergamon Press (1979)
10 Feinbrun-Dothan N.. Flora Palaestina, Vol. 4. Jerusalem; Israel Academy of Sciences and Humanities (1986)
11 Fragman O., Plitmann U., Heller D., Shmida A.. Checklist and Ecological Data-Base of the Flora of Israel and its Surroundings. Jerusalem; Mifalot “Yeffe Nof” and The MiddleEast Nature Conservation Promotion Ass. (1999)
12 Gaglianone M. C.. Behavior on flowers, structures associated to pollen transport and nesting biology of Perditomorpha brunerii and Cephalourgus anomalus (Hymenoptera: Colletidae, Andrenidae). Revista de Biologia Tropical. (2000); 48 89-99
13 Goldblatt P., Bernhardt P., Manning J.. Notes on the pollination mechanisms of Moraea inclinata and M. brevistyla (Iridaceae). Plant Systematics and Evolution. (1989); 163 201-209
14 Goldblatt P., Bernhardt P.. Pollination of Morea species (Iridaceae) with a staminal column. Annals of the Missouri Botanical Garden. (1999); 86 47-56
15 Handel S. N.. The intrusion of clonal growth patterns on plant breeding systems. The American Naturalist. (1985); 125 367-384
16 Horovitz A.. Edaphic factor and flower colour distribution in the Anemonaea. Plant Systematics and Evolution. (1976); 126 239-242
17 Ivri Y., Eisikowitch D.. Observations in pollination of Iris lortetii. . Israel Land and Nature (Teva Va-Aretz). (1988); 30 5-9
18 Jaffe S.. Climate of Israel. Yom-Tov, Y. and Tchernov, E., eds. The Zoogeography of Israel. Dordrecht; Dr W. Junk Publishers (1988)
19 Kadmon R., Shmida A.. Departure rules used by bees foraging for nectar a field test. Evolutionary Ecology. (1992); 6 142-151
20 Kevan P., Baker H. G.. Insects as flower visitors and pollinators. Annual Review of Entomology. (1983); 28 407-453
21 Klinkhamer P. G. L., de Jong T. J., de Bruyn G.-J.. Plant size and pollinator visitation in Cynoglossum officinale. . Oikos. (1989); 54 201-204
22 Kron P., Stewart S. C., Back A.. Self-compatibility, autonomous self-pollination, and insect-mediated pollination in the clonal species Iris versicolor. . Canadian Journal of Botany. (1993); 71 1503-1509
23 Michener C. D.. The Bees of the World. Baltimore, MD; Johns Hopkins University Press (2000)
24 Morgan M. T., Schoen D. J., Bataillon T. M.. The evolution of self-fertilization in perennials. The American Naturalist. (1997); 150 618-638
25 Nachtigall W.. Flight and foraging behavior of Eucera and Anthophora species on Cyprus (Hymenoptera: Apidae). Entomologia Generalis. (1994); 19 29-37
26 Neff J. L., Danforth B. N.. The nesting and foraging behavior of Perdita texana (Cresson) (Hymenoptera: Andrenidae). Journal of the Kansas Entomological Society. (1992); 64 394-405
27 O'Toole C., Raw A.. Bees of the World. London; Blandford (1999)
28 Planisek S. L.. The breeding system, fecundity, and dispersal of Iris lacustris. . The Michigan Botanist. (1983); 22 93-102
29 Potts S. G., Vulliamy B., Dafni A., Ne'eman G., Willmer P.. Linking bees and flowers: how do floral communities structure pollinator communities?. Ecology. (2003); 84 2628-2642
30 Proctor M., Yeo P., Lack A.. The Natural History of Pollination. London; Harper Collins (1996)
31 Rodriguez-Riano T., Dafni A.. A new procedure to asses pollen viability. Sexual Plant Reproduction. (2000); 12 241-244
32 Sapir Y., Shmida A., Comes H. P.. Iris bismarckiana in Israel and Jordan - new findings and taxonomic remarks. Israel Journal of Plant Sciences. (2001); 49 229-235
33 Sapir Y., Shmida A.. Species concepts and ecogeographical divergence of Oncocyclus irises. Israel Journal of Plant Sciences. (2002); 50 S119-S127
34 Sapir Y., Shmida A., Fragman O., Comes H. P.. Morphological variation of the Oncocyclus Irises (Iris: Iridaceae) in the Southern Levant. Botanical Journal of the Linnean Society. (2002); 139 369-382
35 Sapir Y., Shmida A., Fragman O.. Constructing Red Numbers for endangered plant species - Israeli flora as a test case. Journal for Nature Conservation. (2003); 11 91-107
36 Sapir Y.. Pollination ecology of Oncocyclus irises. PhD thesis, The Hebrew University of Jerusalem. (2004)
37 Shimron O.. Aspects in the biology and chemical ecology of two species of long horned bees Eucera palestinae Friese and Eucera sp. MSc thesis, Tel Aviv University. (1984)
38 Shimron O., Hefetz A.. Mating behavior and sex attraction of Eucera palestinae Friese (Hymenoptera: Anthophoridae). Journal of the Kansas Entomological Society. (1985); 58 526-531
39 Stebbins G. L.. Flowering Plants - Evolution Above the Species Level. Cambridge, MA; The Belknap Press of Harvard University Press (1974)
40 Sutherland J. P., Sullivan M. S., Poppy G. M.. The influence of floral character on foraging behaviour of the hoverfly, Episyrphus balteatus. . Entomologia Experimentalis et Applicata. (1999); 93 157-164
41 Wilson C. A.. Floral stages, ovule development, and ovule and fruit success in Iris tenax, focusing on var. gormanii, a taxon with low seed set. American Journal of Botany. (2001); 88 2221-2231
42 Zhang D.-Y.. Resource allocation and the evolution of self-fertilization in plants. The American Naturalist. (2000); 155 187-199
43 Zink R. A., Wheelwright N. T.. Facultative self-pollination in Island Iris. The American Midland Naturalist. (1997); 137 72-78

Y. Sapir

Department of Evolution, Systematics and Ecology
The Hebrew University of Jerusalem

Givat Ram

Jerusalem, 91904

Israel

eMail: ysapir@indiana.edu

Editor: S. S. Renner