Pollen precedence and stigma closure: a mechanism of competition for pollination between Delphinium nelsonii and Ipomopsis aggregata

Oecologia ◽  
1986 ◽  
Vol 70 (4) ◽  
pp. 573-577 ◽  
Author(s):  
Nickolas M. Waser ◽  
Michael L. Fugate
Keyword(s):  
Ipomopsis Aggregata ◽  
Competition For Pollination ◽  
Stigma Closure

scholarly journals COMPETITION FOR POLLINATION INFLUENCES SELECTION ON FLORAL TRAITS OF IPOMOPSIS AGGREGATA

Evolution ◽  
2000 ◽  
Vol 54 (5) ◽  
pp. 1546-1557 ◽  
Author(s):  
Christina M. Caruso
Keyword(s):  
Floral Traits ◽  
Ipomopsis Aggregata ◽  
Competition For Pollination

Interspecific pollen transfer as a mechanism of competition: effect of Castilleja linariaefolia pollen on seed set of Ipomopsis aggregata

2000 ◽  
Vol 78 (5) ◽  
pp. 600-606 ◽  
Author(s):  
Christina M Caruso ◽  
Monica Alfaro
Keyword(s):  
Seed Set ◽  
Pollen Transfer ◽  
Competition Effect ◽  
Priority Effect ◽  
Negative Effects ◽  
Ipomopsis Aggregata ◽  
Interspecific Pollen Transfer ◽  
Hand Pollination ◽  
Stigma Closure ◽  
Pollen Flowers

We investigated whether the deposition of Castilleja linariaefolia (Pursh) V. Grant pollen on flowers of Ipomopsis aggregata (Benth.) in DC. reduced I. aggregata's seed set. Ipomopsis flowers were hand-pollinated with either pure conspecific pollen (the control) or with C. linariaefolia pollen applied prior to, simultaneously with, or following conspecific pollen. Flowers that were simultaneously given C. linariaefolia and I. aggregata pollen received 39% less conspecific pollen than flowers in the control, but did not set fewer seeds per fruit. Flowers that were given C. linariaefolia pollen first received 30% less conspecific pollen and set 38% fewer seeds per fruit than the control. These results suggest that there is a priority effect; deposition of C. linariaefolia pollen on I. aggregata flowers results in competition, but only when C. linariaefolia pollen is deposited first. Unlike pollen of another competitor of I. aggregata (Delphinium nelsonii Greene. Per.), C. linariaefolia pollen caused competition without inducing an increased rate of stigma closure. Only 12% of I. aggregata's stigmas closed when C. linariaefolia pollen was deposited, and seed set of I. aggregata was reduced relative to the control whether their stigmas closed or not. The low rate at which C. linariaefolia pollen induces closure of I. aggregata's stigmas could be an adaptation to reduce the negative effects of competition.Key words: Castilleja linariaefolia, competition, hand pollination, hummingbirds, Ipomopsis aggregata, pollination.

Integration of invasive tree, black locust, into agro-ecological flower visitor networks induces competition for pollination services

2021 ◽  
Author(s):  
Gerald Chikowore ◽  
Sandy-Lynn Steenhuisen ◽  
Reyard Mutamiswa ◽  
Grant D. Martin ◽  
Frank Chidawanyika
Keyword(s):  
Black Locust ◽  
Pollination Services ◽  
Flower Visitor ◽  
Competition For Pollination ◽  
Invasive Tree

scholarly journals Interactive effects of climate change and plant invasion on alpine biodiversity and ecosystem dynamics

2021 ◽  
Author(s):  
◽  
Justyna Giejsztowt
Keyword(s):  
Climate Change ◽  
New Zealand ◽  
Plant Species ◽  
Climate Warming ◽  
Plant Invasion ◽  
Invasive Plant ◽  
Ecosystem Dynamics ◽  
Interactive Effects ◽  
Native Plant ◽  
Competition For Pollination

<p>Drivers of global change have direct impacts on the structure of communities and functioning of ecosystems, and interactions between drivers may buffer or exacerbate these direct effects. Interactions among drivers can lead to complex non-linear outcomes for ecosystems, communities and species, but are infrequently quantified. Through a combination of experimental, observational and modelling approaches, I address critical gaps in our understanding of the interactive effects of climate change and plant invasion, using Tongariro National Park (TNP; New Zealand) as a model. TNP is an alpine ecosystem of cultural significance which hosts a unique flora with high rates of endemism. TNP is invaded by the perennial shrub Calluna vulgaris (L.) Hull. My objectives were to: 1) determine whether species-specific phenological shifts have the potential to alter the reproductive capacity of native plants in landscapes affected by invasion; 2) determine whether the effect of invasion intensity on the Species Area Relationship (SAR) of native alpine plant species is influenced by environmental stress; 3) develop a novel modelling framework that would account for density-dependent competitive interactions between native species and C. vulgaris and implement it to determine the combined risk of climate change and plant invasion on the distribution of native plant species; and 4) explore the possible mechanisms leading to a discrepancy in C. vulgaris invasion success on the North and South Islands of New Zealand. I show that species-specific phenological responses to climate warming increase the flowering overlap between a native and an invasive plant. I then show that competition for pollination with the invader decreases the sexual reproduction of the native in some landscapes. I therefore illustrate a previously undescribed interaction between climate warming and plant invasion where the effects of competition for pollination with an invader on the sexual reproduction of the native may be exacerbated by climate warming. Furthermore, I describe a previously unknown pattern of changing invasive plant impact on SAR along an environmental stress gradient. Namely, I demonstrate that interactions between an invasive plant and local native plant species richness become increasingly facilitative along elevational gradients and that the strength of plant interactions is dependent on invader biomass. I then show that the consequences of changing plant interactions at a local scale for the slope of SAR is dependent on the pervasion of the invader. Next, I demonstrate that the inclusion of invasive species density data in distribution models for a native plant leads to greater reductions in predicted native plant distribution and density under future climate change scenarios relative to models based on climate suitability alone. Finally, I find no evidence for large-scale climatic, edaphic, and vegetative limitations to invasion by C. vulgaris on either the North and South Islands of New Zealand. Instead, my results suggest that discrepancies in invasive spread between islands may be driven by human activity: C. vulgaris is associated with the same levels of human disturbance on both islands despite differences in the presence of these conditions between then islands. Altogether, these results show that interactive effects between drivers on biodiversity and ecosystem dynamics are frequently not additive or linear. Therefore, accurate predictions of global change impacts on community structure and ecosystems function require experiments and models which include of interactions among drivers such as climate change and species invasion. These results are pertinent to effective conservation management as most landscapes are concurrently affected by multiple drivers of global environmental change.</p>

VARIATION IN POLLEN FLOW WITHIN AND AMONG POPULATIONS OF IPOMOPSIS AGGREGATA

Evolution ◽  
1989 ◽  
Vol 43 (7) ◽  
pp. 1444-1455 ◽  
Author(s):  
Diane R. Campbell ◽  
Nickolas M. Waser
Keyword(s):  
Pollen Flow ◽  
Ipomopsis Aggregata

Ipomopsin, a New Biscoumarin from Ipomopsis aggregata

1984 ◽  
Vol 47 (1) ◽  
pp. 106-112 ◽  
Author(s):  
Munehisa Arisawa ◽  
A. Douglas Kinghorn ◽  
Geoffrey A. Cordell ◽  
Norman R. Farnsworth
Keyword(s):  
Ipomopsis Aggregata

Maternal flower color, ultraviolet protection, and germination in Ipomopsis aggregata (Polemoniaceae)

2022 ◽  
Author(s):  
Charlotte DiBiase ◽  
Elsa Godtfredsen ◽  
Julian Dahl ◽  
Alex Shapiro ◽  
Keirsten Brown ◽  
...  
Keyword(s):  
Flower Color ◽  
Ipomopsis Aggregata ◽  
Ultraviolet Protection

Differences in Flowering Phenology Are Likely Not the Product of Competition for Pollination in Clarkia Communities

2019 ◽  
Vol 180 (9) ◽  
pp. 974-986 ◽  
Author(s):  
Katherine E. Eisen ◽  
Diane R. Campbell ◽  
Elizabeth Richards ◽  
Monica A. Geber
Keyword(s):  
Flowering Phenology ◽  
Competition For Pollination

Non-Random Foraging by Hummingbirds: Patterns of Movement Between Ipomopsis aggregata (Pursch) V. Grant Inflorescences

1990 ◽  
Vol 4 (2) ◽  
pp. 149 ◽  
Author(s):  
L. L. Wolf ◽  
F. R. Hainsworth
Keyword(s):  
Ipomopsis Aggregata
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