Skip to main content

Interactions between oil-collecting bees and Krameria grandiflora (Krameriaceae) with emphasis on the role of specialized floral traits in the mutual fit


Oil-producing flowers have evolved specialized traits along with the ability to secrete oil as reward, leading to the expectation of a narrow relationship between floral architecture and oil-collecting behaviours of pollinators. Krameriaceae flowers have a showy calyx and a less conspicuous dimorphic corolla modified into a pair of elaiophores that secrete the oil, and a group of petaloid petals that, among oil-collecting bees, are used by only Centris (Centridini) during the oil gathering. A manipulative experiment consisted of excising these floral parts to test the prediction that these structures contribute to successful oil gathering by the bees and plant reproduction. We surveyed the oil-collecting bees associated with the Krameria grandiflora A. St.-Hil. across its distribution range and performed the experiment in populations associated with two different oil-collecting bee taxa—Caenonomada (Tapinotaspidini) and Centris, the main pollinators. Although predicted to mediate the floral mechanical fit with Centris, the absence of the petaloid petals had a neutral effect on both oil-gathering behaviour and seed set, when comparing Caenonomada and Centris. A negative effect on these responses was found when the elaiophores were excised, indicating that these glands have greater importance than the petals related to the mutual fit between flowers and pollinators. However, the petaloid petals seemed to function jointly with the sepals in pollinator attraction. When the sepals were excised, only Centris behaviour was affected, but not that of Caenonomada, indicating potentially divergent selective pressures on the calyx. In addition, we provide a novel oil host plant for several oil-collecting bees.

This is a preview of subscription content, access via your institution.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7


Download references


We thank ICMBio/SISBIO, for allowing us to conduct the study in the Conservation Units, and the Corumbá City Council, for letting us to work at the Piraputangas Park. We also thank Dr. Felipe Vivallo (National Museum/UFRJ, Rio de Janeiro, Brazil), for identifying the specimens of Centridini, Dr. Antônio Aguiar (UnB, Brasília, Brazil), for identifying the specimens of Tapinotaspidini, Dr. Sheina Koffler (IB/USP, São Paulo, Brazil), for the helpful discussions on the research, MSc. Felipe Libran Embid (Georg-August-Universität Göttingen, Göttingen, Germany), for helping with the fieldwork, two anonymous reviewers and the editor, for the constructive criticism and support to the manuscript. We are grateful for the awarded scholarship grants and financial support for LTC and IA by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, 2013/00181-5 and 04/00274-4).

Author information

Authors and Affiliations



L.T.C. and I.A. conceived the general outline of the study; L.T.C. designed the methodology, collected the samples with the support of C.B.D.S.A., and led the analysis and writing of the manuscript with substantial contributions by A.T. and I.A. All the authors contributed critically to the drafts and gave final approval for publication.

Corresponding author

Correspondence to Liedson Tavares Carneiro.

Additional information

Handling Editor: Dagmar Voigt.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary material 1 (DOCX 19 KB)

Supplementary material 2 (DOCX 24 KB)

Supplementary material 3 (DOCX 17 KB)

Supplementary material 4 (MP4 73093 KB)

Rights and permissions

Reprints and Permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Carneiro, L.T., André, C.B.D.S., Takahasi, A. et al. Interactions between oil-collecting bees and Krameria grandiflora (Krameriaceae) with emphasis on the role of specialized floral traits in the mutual fit. Arthropod-Plant Interactions 13, 213–226 (2019).

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: