caa a22 4500 477039324 CHVBK 20180405111313.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00989056 doi (NATIONALLICENCE)springer-10.1007/BF00989056 The consequences of specialization for pollination in a rare South African shrub, Ixianthes retzioides ( Scrophulariaceae ) [Elektronische Daten] [Kim Steiner, V. Whitehead] Ixianthes retzioides is a rare South African shrub with large yellow oil-secreting flowers. Populations studied previously revealed low levels of reproductive success and the absence of a specialized oil-collecting pollinator. We report the discovery of a population in which the predicted specialist pollinator,Rediviva gigas, is present. The presence of this oil-collecting bee resulted in a mean fruit set per plant of 97.2 ± 8.3% (N = 9) and a mean seed set of 331.6 ± 162.6 (N = 52). This represents a 7.4-fold increase in fruit set and a 7.8-fold increase in seed set over a previously studied population lacking the specialist pollinator. The contrast between populations with and without the specialist pollinator dramatically illustrates the potential benefits and costs of specialization for pollination, respectively. Springer-Verlag, 1996 Scrophulariaceae nationallicence Ixianthes nationallicence Melittidae nationallicence Rediviva nationallicence Floral oil nationallicence oil-collecting bees nationallicence specialization for pollination nationallicence reproductive success nationallicence Steiner Kim Compton Herbarium, National Botanical Institute, Private Bag X7, 7735, Claremont, Republic of South Africa aut Whitehead V. South African Museum, P.O. Box 61, 8000, Cape Town, Republic of South Africa aut Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 131-138 0378-2697 201:1-4<131 1996 201 606 https://doi.org/10.1007/BF00989056 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00989056 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Steiner Kim Compton Herbarium, National Botanical Institute, Private Bag X7, 7735, Claremont, Republic of South Africa aut NATIONALLICENCE 700 1- Whitehead V. South African Museum, P.O. Box 61, 8000, Cape Town, Republic of South Africa aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 131-138 0378-2697 201:1-4<131 1996 201 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer