Abstract
The individual and combined effects of abiotic factors on pollinator-mediated selection on floral traits are not well documented. To examine potential interactive effects of water and nutrient availability on pollinator-mediated selection on three floral display traits of Primula tibetica, we manipulated pollination and nutrient availability in a factorial experiment, conducted at two common garden sites with different soil water content (natural vs addition). We found that both water and nutrient availability affected floral trait expression in P. tibetica and that hand pollination increased seed production most when both nutrient content and water content were high, indicating joint pollen and resource limitation. We documented selection on all floral traits, and pollinators contributed to directional and correlational selection on plant height and number of flowers. Soil water and nutrient availability interactively influenced the strength of both pollinator-mediated directional and correlational selection, with significant selection observed when nutrient or water availability was high, but not when none or both were added. The results suggest that resource limitation constrains the response of P. tibetica to among-individual variation in pollen receipt, that addition of nutrients or water leads to pollinator-mediated selection and that effects of the two abiotic factors are nonadditive.
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Claims 8
Claim · model-written summary
Water availability affected floral trait expression in Primula tibetica.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Treatment
- watere0
- Outcome
- floral trait expressione0
Not reportedComparatorDirection
Verbatim
e0“both water and nutrient availability affected floral trait expression in P. tibetica”
e1“Primula tibetica”
Claim · model-written summary
Nutrient availability affected floral trait expression in Primula tibetica.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Treatment
- nutrient availabilitye0
- Outcome
- floral trait expressione0
Not reportedComparatorDirection
Verbatim
e0“both water and nutrient availability affected floral trait expression in P. tibetica”
e1“Primula tibetica”
Claim · model-written summary
Hand pollination increased Primula tibetica seed production most when nutrient and water content were high.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Treatment
- hand pollinatione0
- Outcome
- seed productione0
- Direction
- increasede0
- Qualifier
- both nutrient content and water content were highe0
Not reportedComparator
Verbatim
e0“hand pollination increased seed production most when both nutrient content and water content were high”
e1“Primula tibetica”
Claim · model-written summary
Selection was documented on all measured floral traits of Primula tibetica.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Outcome
- selection on all floral traitse0
Verbatim
e0“We documented selection on all floral traits”
e1“Primula tibetica”
Claim · model-written summary
Pollinators contributed to directional selection on Primula tibetica plant height and flower number.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Interactor
- pollinatorse0pollinator
- Outcome
- plant height and number of flowerse0
Not reportedDirection
Verbatim
e0“pollinators contributed to directional and correlational selection on plant height and number of flowers”
e1“Primula tibetica”
Claim · model-written summary
Pollinators contributed to correlational selection on Primula tibetica plant height and flower number.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Interactor
- pollinatorse0pollinator
- Outcome
- correlational selection on plant height and number of flowerse0
Not reportedDirection
Verbatim
e0“pollinators contributed to directional and correlational selection on plant height and number of flowers”
e1“Primula tibetica”
Claim · model-written summary
Soil water and nutrient availability interacted in their influence on the strength of pollinator-mediated directional selection in Primula tibetica.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Treatment
- Soil water and nutrient availabilitye0
- Outcome
- strength of both pollinator-mediated directional and correlational selectione0
Not reportedDirection
Verbatim
e0“Soil water and nutrient availability interactively influenced the strength of both pollinator-mediated directional and correlational selection”
e1“Primula tibetica”
Claim · model-written summary
Selection in Primula tibetica was significant when either nutrient or water availability was high, but not when neither or both were added.
- Taxon
- Primula tibeticaPrimula tibeticae1
- Outcome
- selectione0
- Qualifier
- when nutrient or water availability was high, but not when none or both were addede0
Verbatim
e0“significant selection observed when nutrient or water availability was high, but not when none or both were added”
e1“Primula tibetica”