Fitness costs of delayed pollination in a mixed-mating plant
Hildesheim, Laura S. LU
; Opedal, Øystein H.
LU
; Armbruster, W. Scott
and Pélabon, Christophe
(2019)
In Annals of Botany
124(5).
p.869-881
- Abstract
Background and Aims To predict the evolutionary consequences of pollinator declines, we need to understand the evolution of delayed autonomous self-pollination, which is expected to evolve as a mechanism of reproductive assurance when cross-pollination becomes unreliable. This involves estimating the costs of increased levels of selfing as well as those associated with floral senescence. Methods We studied the mechanisms and costs of delayed self-pollination in the mixed-mating vine Dalechampia scandens (Euphorbiaceae) by first assessing among-population variation in herkogamy and dichogamy, which together determine the rate and timing of autonomous self-pollination. We then tested whether floral longevity responds plastically to... (More)
Background and Aims To predict the evolutionary consequences of pollinator declines, we need to understand the evolution of delayed autonomous self-pollination, which is expected to evolve as a mechanism of reproductive assurance when cross-pollination becomes unreliable. This involves estimating the costs of increased levels of selfing as well as those associated with floral senescence. Methods We studied the mechanisms and costs of delayed self-pollination in the mixed-mating vine Dalechampia scandens (Euphorbiaceae) by first assessing among-population variation in herkogamy and dichogamy, which together determine the rate and timing of autonomous self-pollination. We then tested whether floral longevity responds plastically to delayed pollination. Finally, we assessed the costs of delayed self-pollination in terms of seed number and size, explicitly separating inbreeding depression from effects of floral senescence. Key Results Herkogamy varied extensively, while variation in dichogamy was more limited. Unpollinated blossoms increased their longevity, but seed quantity and quality decreased with increasing delays in pollination, independently of inbreeding depression. Conclusions In D. scandens, earlier autonomous selfing is facilitated by reduced herkogamy rather than reduced protogyny, providing reproductive assurance while maintaining the possibility for outcrossing events. Effective early autonomous self-pollination may evolve under reduced cross-pollination reliability in response to costs associated with floral senescence.
(Less)
- author
- Hildesheim, Laura S.
LU
; Opedal, Øystein H.
LU
; Armbruster, W. Scott
and Pélabon, Christophe
- publishing date
- 2019-10-01
- type
- Contribution to journal
- publication status
- published
- keywords
- Dalechampia scandens, Delayed self-pollination, Dichogamy, Floral ontogeny, Flower longevity, Herkogamy, Inbreeding depression, Mating system, Plant fitness, Pollination reliability, Pollinator decline
- in
- Annals of Botany
- volume
- 124
- issue
- 5
- pages
- 13 pages
- publisher
- Oxford University Press
- external identifiers
-
- pmid:31504153
- scopus:85075813446
- ISSN
- 0305-7364
- DOI
- 10.1093/aob/mcz141
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © The Author(s) 2019.
- id
- 074e1924-208b-40c7-ba22-9c4de72733ff
- date added to LUP
- 2024-07-24 08:45:36
- date last changed
- 2024-08-13 16:31:58
@article{074e1924-208b-40c7-ba22-9c4de72733ff,
abstract = {{<p>Background and Aims To predict the evolutionary consequences of pollinator declines, we need to understand the evolution of delayed autonomous self-pollination, which is expected to evolve as a mechanism of reproductive assurance when cross-pollination becomes unreliable. This involves estimating the costs of increased levels of selfing as well as those associated with floral senescence. Methods We studied the mechanisms and costs of delayed self-pollination in the mixed-mating vine Dalechampia scandens (Euphorbiaceae) by first assessing among-population variation in herkogamy and dichogamy, which together determine the rate and timing of autonomous self-pollination. We then tested whether floral longevity responds plastically to delayed pollination. Finally, we assessed the costs of delayed self-pollination in terms of seed number and size, explicitly separating inbreeding depression from effects of floral senescence. Key Results Herkogamy varied extensively, while variation in dichogamy was more limited. Unpollinated blossoms increased their longevity, but seed quantity and quality decreased with increasing delays in pollination, independently of inbreeding depression. Conclusions In D. scandens, earlier autonomous selfing is facilitated by reduced herkogamy rather than reduced protogyny, providing reproductive assurance while maintaining the possibility for outcrossing events. Effective early autonomous self-pollination may evolve under reduced cross-pollination reliability in response to costs associated with floral senescence.</p>}},
author = {{Hildesheim, Laura S. and Opedal, Øystein H. and Armbruster, W. Scott and Pélabon, Christophe}},
issn = {{0305-7364}},
keywords = {{Dalechampia scandens; Delayed self-pollination; Dichogamy; Floral ontogeny; Flower longevity; Herkogamy; Inbreeding depression; Mating system; Plant fitness; Pollination reliability; Pollinator decline}},
language = {{eng}},
month = {{10}},
number = {{5}},
pages = {{869--881}},
publisher = {{Oxford University Press}},
series = {{Annals of Botany}},
title = {{Fitness costs of delayed pollination in a mixed-mating plant}},
url = {{http://dx.doi.org/10.1093/aob/mcz141}},
doi = {{10.1093/aob/mcz141}},
volume = {{124}},
year = {{2019}},
}