Variation in Pollen Limitation among Plants and Phenotypic Selection on Floral Traits in an Early-Spring Flowering Herb

Oikos ◽  
1998 ◽  
Vol 82 (3) ◽  
pp. 491 ◽  
Author(s):  
Ørjan Totland ◽  
Heidi L. Andersen ◽  
Torbjørg Bjelland ◽  
Vibeke Dahl ◽  
Wenche Eide ◽  
...  
Keyword(s):  
Pollen Limitation ◽  
Phenotypic Selection ◽  
Early Spring ◽  
Floral Traits

Effect of coflowering Mimulus ringens on phenotypic selection on floral traits of gynodioecious Lobelia siphilitica

Botany ◽  
2013 ◽  
Vol 91 (11) ◽  
pp. 745-751 ◽  
Author(s):  
Erica Wassink ◽  
Christina M. Caruso
Keyword(s):  
Seed Set ◽  
Flower Colour ◽  
Phenotypic Selection ◽  
Character Displacement ◽  
Floral Traits ◽  
Competition For Pollination ◽  
Mimulus Ringens ◽  
Potential Competitor ◽  
Selection For ◽  
Presence And Absence

Although interspecific competition for pollination is hypothesized to result in divergence in floral traits (i.e., character displacement), few studies have tested whether selection on these traits differs in the presence and absence of a competitor for pollination. We measured phenotypic selection on floral traits of Lobelia siphilitica L. growing in the presence and absence of Mimulus ringens L., a potential competitor for pollination. Because L. siphilitica is gynodioecious, we estimated selection separately for female and hermaphrodite plants. The presence of M. ringens did not decrease seed set of L. siphilitica. However, the presence of M. ringens did affect selection on daily display size of female L. siphilitica; there was significant selection for smaller daily displays in the absence of M. ringens, but nonsignificant selection for larger displays in the presence of M. ringens. In addition, selection on flower colour did not differ in the presence and absence of M. ringens, but did differ between female and hermaphrodite L. siphilitica. Consequently, our results suggest that the evolution of floral traits in L. siphilitica, but not the evolution of sexual dimorphism in these traits, can be affected by interactions for pollination with M. ringens.

Is there spatial variation in phenotypic selection on floral traits in a generalist plant–pollinator system?

2019 ◽  
Vol 33 (5) ◽  
pp. 687-700
Author(s):  
Alejandra V. González ◽  
Catalina González-Browne ◽  
Patricia Salinas ◽  
Maureen Murúa
Keyword(s):  
Spatial Variation ◽  
Phenotypic Selection ◽  
Floral Traits ◽  
Plant Pollinator

Pollinator visitation, pollen limitation, and selection on flower size through female function in contrasting habitats within a population of Campanula persicifolia

2006 ◽  
Vol 84 (3) ◽  
pp. 412-420 ◽  
Author(s):  
Vivi-Irèn Hansen ◽  
Ørjan Totland
Keyword(s):  
Seed Production ◽  
Structural Equation ◽  
Pollen Limitation ◽  
Phenotypic Selection ◽  
Flower Size ◽  
Pollinator Visitation ◽  
Pollinator Attraction ◽  
Female Function ◽  
Flower Visitation ◽  
Visitation Rates

We looked at whether flower visitation rates, pollen limitation on seed production, and phenotypic selection on flower size through female function varied across a sharp gradient in light intensity (open meadow vs. forest) within a population of the perennial plant Campanula persicifolia L. (Campanulaceae). Flower visitation rates of putative pollinators were similar in both habitats. Seed number per fruit was strongly pollen limited, with no difference in the magnitude of pollen limitation between the two habitats. This strong pollen limitation set the basis for significant phenotypic selection, through female function, on a trait that probably is important for pollinator attraction: flower size. This was revealed by path analysis and structural equation modelling. The lack of difference in pollen limitation on seed production in the two habitats may be explained by the similarity in flower visitation rates in the two habitats. Moreover, the similarity in pollen limitation in the two habitats probably resulted in a similar magnitude and direction of selection on flower size through female function. Our results suggest that pollen limitation and selection through female function may vary little across space within a popualtion despite large variation in the environmental conditions experienced by plants.

scholarly journals Effects of environmental heterogeneity on phenotypic variation of the endemic plant Lilium pomponium in the Maritime and Ligurian Alps

Oecologia ◽  
2020 ◽  
Author(s):  
Carmelo Macrì ◽  
Davide Dagnino ◽  
Maria Guerrina ◽  
Frédéric Médail ◽  
Luigi Minuto ◽  
...  
Keyword(s):  
Phenotypic Variation ◽  
Environmental Heterogeneity ◽  
Pollen Limitation ◽  
Phenotypic Variability ◽  
Distribution Range ◽  
Floral Traits ◽  
Peripheral Populations ◽  
Endemic Plant ◽  
Floral Trait ◽  
Ligurian Alps

AbstractGeographical limits of species’ distributions are assumed to be coincident with ecological margins, although this assumption might not always be true. Indeed, harsh environments such as Alpine and Mediterranean ecosystems may favour high phenotypic variability among populations, especially those in peripheral sites. Floral traits are often found to be less variable and less affected by environmental heterogeneity than vegetative traits because variation in the former may have negative effects on fitness. For this reason, it is important to quantify variation in floral traits and plant fecundity in study range limits. The objective of the study is to examine phenotypic variation and differences in reproduction in endemic Lilium pomponium in the Maritime and Ligurian Alps in relation to environmental variation across its distribution range. In this species, marginal climatic populations occur both in the peripheral and central geographical locations of the distribution range; hence, geographical and ecological gradients are not concordant. Floral trait variation is related to local environmental conditions with an array of interactions among resource availability, potential pollen limitation and population size that are differentially related to floral traits. Contrary to the general expectation, all central and peripheral populations had similar, moderate seed production with each group limited by different factors acting on different stages of the life-history strategy. Our results are in line with the idea that general expectations are confirmed only when its assumptions are met and that the differences in pollination environment along an environmental gradient may not be the main determinant of the distribution limit.

Pollen limitation, species’ floral traits and pollinator visitation: different relationships in contrasting communities

Oikos ◽  
2014 ◽  
Vol 124 (2) ◽  
pp. 174-186 ◽  
Author(s):  
Amparo Lázaro ◽  
Rebekka Lundgren ◽  
Ørjan Totland
Keyword(s):  
Pollen Limitation ◽  
Floral Traits ◽  
Pollinator Visitation

scholarly journals Pollination biology of the urban populations of an ancient forest, spring ephemeral plant

2016 ◽  
Vol 85 (2) ◽  
Author(s):  
Maciej A. Ziemiański ◽  
Marcin Zych
Keyword(s):  
Habitat Fragmentation ◽  
Pollen Limitation ◽  
Early Spring ◽  
Climatic Conditions ◽  
Urban Populations ◽  
Social Bees ◽  
Spring Ephemerals ◽  
Spring Ephemeral ◽  
Ephemeral Plant ◽  
Ancient Forest

Habitat fragmentation, caused by, among all, agriculture and urbanization, is one of the most important drivers of plant biodiversity decline worldwide. One of the signs of deteriorating zoogamous plant reproduction is pollen limitation, often associated with a decline in pollinator diversity and abundance. Various authors predict that the most vulnerable taxa are outbreeding plant species characterized by specialist pollination systems. We have, therefore, focused on self-incompatible <em>Corydalis solida</em>, an ancient forest, spring ephemeral plant, growing in three remnant urban populations in the city of Warsaw (Poland). Over two years, we checked for pollen limitation and recorded insect diversity and abundance for <em>C. solida</em> flowers. Our study populations composed of self-incompatible individuals were mainly visited by generalist pollinators, and produced more seeds when supplementally pollinated. Pollen limitation, however, was greater during 1 year with an early spring onset, when we observed a decline in floral visitors diversity and activity. This was probably an effect of phenological mismatch between plants and their pollinators, in this case, mostly social bees, i.e., over-wintered bumblebee queens and <em>Apis mellifera</em>. We conclude that for outbreeding zoogamous spring ephemerals, such as <em>C. solida</em> serviced by generalist pollinators, changing climatic conditions may override the effects of habitat fragmentation and influence their reproductive success.

scholarly journals Pollinator-Mediated Selection on Floral Traits in the Arctic Plant Parrya nudicaulis (Brassicaceae)

2021 ◽  
Author(s):  
Matthew Carlson ◽  
Justin Fulkerson
Keyword(s):  
Flower Color ◽  
Phenotypic Selection ◽  
Directional Selection ◽  
The Arctic ◽  
Floral Traits ◽  
Reproductive Assurance ◽  
Pollinator Attraction ◽  
Selection Gradients ◽  
Selective Agents ◽  
Selection For

The evolution of floral traits is largely attributed to pollinator-mediated selection; however, the importance of pollinators as selective agents in pollen-limited environments is poorly resolved. In pollen-limited arctic and subarctic regions, selection is expected to either favor floral traits that increase pollinator attraction or promote reproductive assurance through selfing. We quantified phenotypic selection on floral traits in two arctic and two subarctic populations of Parrya nudicaulis. Additionally, we measured selection in plants in both open-pollination and pollen-augmentation treatments to estimate selection imposed by pollinators in one population. Seed production was found to be limited by pollen availability and strong directional selection on flower number was observed. We did not detect consistently greater magnitudes of selection on floral traits in the arctic relative to the subarctic populations. Directional selection for more pigmented flowers in one arctic population was observed however. In some populations, selection on flower color was found to interact with other traits. We did not detect consistently stronger selection gradients across all traits for plants exposed to pollinator selection relative to those in the pollen-augmentation treatment; however directional selection tended to be higher for some floral traits in open-pollinated plants.

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