Extensive pollinator sharing does not promote character displacement in two orchid congeners
(2022) In Evolution 76(4). p.749-764- Abstract
Pollinator sharing between close relatives can be costly and can promote pollination niche partitioning and floral divergence. This should be reflected by a higher species divergence in sympatry than in allopatry. We tested this hypothesis in two orchid congeners with overlapping distributions and flowering times. We characterized floral traits and pollination niches and quantified pollen limitation in 15 pure and mixed populations, and we measured phenotypic selection on floral traits and performed controlled crosses in one mixed site. Most floral traits differed between species, yet pollinator sharing was extensive. Only the timing of scent emission diverged more in mixed sites than in pure sites, and this was not mirrored by the... (More)
Pollinator sharing between close relatives can be costly and can promote pollination niche partitioning and floral divergence. This should be reflected by a higher species divergence in sympatry than in allopatry. We tested this hypothesis in two orchid congeners with overlapping distributions and flowering times. We characterized floral traits and pollination niches and quantified pollen limitation in 15 pure and mixed populations, and we measured phenotypic selection on floral traits and performed controlled crosses in one mixed site. Most floral traits differed between species, yet pollinator sharing was extensive. Only the timing of scent emission diverged more in mixed sites than in pure sites, and this was not mirrored by the timing of pollinator visitation. We did not detect divergent selection on floral traits. Seed production was pollen limited in most populations but not more severely in mixed sites than in pure sites. Interspecific crosses produced the same or a higher proportion of viable seeds than intraspecific crosses. The two orchid species attract the same pollinator species despite showing divergent floral traits. However, this does not promote character displacement, implying a low cost of pollinator sharing. Our results highlight the importance of characterizing both traits and ecological niches in character displacement studies.
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- author
- Joffard, Nina ; Olofsson, Caroliné ; Friberg, Magne LU and Sletvold, Nina
- organization
- publishing date
- 2022-04
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Character displacement, divergent selection, floral scent, Gymnadenia, pollen limitation, pollinator sharing
- in
- Evolution
- volume
- 76
- issue
- 4
- pages
- 16 pages
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:35188979
- scopus:85125411448
- ISSN
- 0014-3820
- DOI
- 10.1111/evo.14446
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: This study was funded by grants from the Carl Tryggers Stiftelse and Swedish Phytogeographical Society for NJ, from the Swedish Research Council for MF, and from the Swedish Research Council Formas for NS. The authors thank J. Anderson, H. Begle, E. Chapurlat, J. Denzil Bull, O. Henriksson, M. Uscka‐Perzanowska, K. Svensson, H. Thosteman, L. Valois, and L. Vikström for their assistance in the field and/or in the laboratory. The authors are also grateful to A. Wilks and D. Karlsson from Station Linné for helping us prepare fieldwork and identify pollinators and to N. Barthes for helping us identify floral compounds. The authors also thank J. Ågren, C. Jandér, P. Milesi, and M. Tiret for helpful discussions. Publisher Copyright: © 2022 The Authors. Evolution © 2022 The Society for the Study of Evolution.
- id
- 6e69fd86-87c8-43a6-aa27-28329b3e46c8
- date added to LUP
- 2022-12-30 11:45:48
- date last changed
- 2024-04-14 23:45:13
@article{6e69fd86-87c8-43a6-aa27-28329b3e46c8,
abstract = {{<p>Pollinator sharing between close relatives can be costly and can promote pollination niche partitioning and floral divergence. This should be reflected by a higher species divergence in sympatry than in allopatry. We tested this hypothesis in two orchid congeners with overlapping distributions and flowering times. We characterized floral traits and pollination niches and quantified pollen limitation in 15 pure and mixed populations, and we measured phenotypic selection on floral traits and performed controlled crosses in one mixed site. Most floral traits differed between species, yet pollinator sharing was extensive. Only the timing of scent emission diverged more in mixed sites than in pure sites, and this was not mirrored by the timing of pollinator visitation. We did not detect divergent selection on floral traits. Seed production was pollen limited in most populations but not more severely in mixed sites than in pure sites. Interspecific crosses produced the same or a higher proportion of viable seeds than intraspecific crosses. The two orchid species attract the same pollinator species despite showing divergent floral traits. However, this does not promote character displacement, implying a low cost of pollinator sharing. Our results highlight the importance of characterizing both traits and ecological niches in character displacement studies.</p>}},
author = {{Joffard, Nina and Olofsson, Caroliné and Friberg, Magne and Sletvold, Nina}},
issn = {{0014-3820}},
keywords = {{Character displacement; divergent selection; floral scent; Gymnadenia; pollen limitation; pollinator sharing}},
language = {{eng}},
number = {{4}},
pages = {{749--764}},
publisher = {{Wiley-Blackwell}},
series = {{Evolution}},
title = {{Extensive pollinator sharing does not promote character displacement in two orchid congeners}},
url = {{http://dx.doi.org/10.1111/evo.14446}},
doi = {{10.1111/evo.14446}},
volume = {{76}},
year = {{2022}},
}