ArticleJournal of plant research2020
Post-pollination barriers enable coexistence of pollinator-sharing ornithophilous Erica species.
Article in Journal of plant research, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Robbers vs. invaders: The effects of alien tree invasions on nectar robbing in bird-pollinated Erica species.Journal of plant research · 2026Article
- Synthesis and Scope of the Role of Postmating Prezygotic Isolation in Speciation.Cold Spring Harbor perspectives in biology · 2024Review
- Pollen transfer efficiency inPhytoKeys · 2024Article
- Genetic structure and trait variation within a maple hybrid zone underscore North China as an overlooked diversity hotspot.Scientific reports · 2022Article
- Pollen competition in hybridizing Cakile species: How does a latecomer win the race?American journal of botany · 2022Article
- Hummingbird contribution to plant reproduction in the rupestrian grasslands is not defined by pollination syndrome.Oecologia · 2022Article
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Authors and funding
3 authors.
Funding
Abstract
Some evolutionary radiations produce a number of closely-related species that continue to coexist. In such plant systems, when pre-pollination barriers are weak, relatively strong post-pollination reproductive barriers are required to maintain species boundaries. Even when post-pollination barriers are in place, however, reproductive interference and pollinator dependence may strengthen selection for pre-pollination barriers. We assessed whether coexistence of species from the unusually speciose Erica genus in the fynbos biome, South Africa, is enabled through pre-pollination or post-pollination barriers. We also tested for reproductive interference and pollinator dependence. We investigated this in natural populations of three bird-pollinated Erica species (Erica plukenetii, E. curviflora and E. coccinea), which form part of a large guild of congeneric species that co-flower and share a single pollinator species (Orange-breasted Sunbird Anthobaphes violacea). At least two of the three pre-pollination barriers assessed (distribution ranges, flowering phenology and flower morphology) were weak in each species pair. Hand-pollination experiments revealed that seed set from heterospecific pollination (average 8%) was significantly lower than seed set from outcross pollination (average 50%), supporting the hypothesis that species boundaries are maintained through post-pollination barriers. Reproductive interference, assessed in one population by applying outcross pollen three hours after applying heterospecific pollen, significantly reduced seed set compared to outcross pollen alone. This may drive selection for traits that enhance pre-pollination barriers, particularly given that two of the three species were self-sterile, and therefore pollinator dependent. This study suggests that post-pollination reproductive barriers could facilitate the coexistence of congeneric species, in a recent radiation with weak pre-pollination reproductive barriers.
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Registered trials
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