Floral density, pollen limitation, and reproductive success in Trillium grandiflorum

Knight, Tiffany M.

doi:10.1007/s00442-003-1371-8

Cited by 110 publications

(109 citation statements)

References 35 publications

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“…Furthermore, pollen limitation of some species has been examined in a number of different years and by more than one researcher (e.g., there are Ͼ10 separate estimates of fruit set for Trillium grandiflorum; ref. 30), whereas other plant species have been the subject of a single study. Therefore, for each unique plant species (n ϭ 241), we calculated the weighted average magnitude of pollen limitation for the species.…”

Section: Methodsmentioning

confidence: 99%

Pollination decays in biodiversity hotspots

Vamosi

Knight

Steets

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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282

226

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As pollinators decline globally, competition for their services is expected to intensify, and this antagonism may be most severe where the number of plant species is the greatest. Using metaanalysis and comparative phylogenetic analysis, we provide a global-scale test of whether reproduction becomes more limited by pollen receipt (pollen limitation) as the number of coexisting plant species increases. As predicted, we find a significant positive relationship between pollen limitation and species richness. In addition, this pattern is particularly strong for species that are obligately outcrossing and for trees relative to herbs or shrubs. We suggest that plants occurring in species-rich communities may be more prone to pollen limitation because of interspecific competition for pollinators. As a consequence, plants in biodiversity hotspots may have a higher risk of extinction and͞or experience increased selection pressure to specialize on certain pollinators or diversify into different phenological niches. The combination of higher pollen limitation and habitat destruction represents a dual risk to tropical plant species that has not been previously identified.extinction ͉ latitudinal gradients ͉ speciation ͉ competition ͉ pollen delivery W ild plant species in biodiversity hotspots are an important world resource for the products and ecosystem services they provide, including medicine, food, nutrient cycling, and alternative resources for pollinators of domesticated crops (1). Maintaining plant biodiversity in hotspots is a critical challenge for conservation biologists because individual species may have reduced mean fitness in species-rich communities because of increased interspecific competition (2-4). In flowering plants, the presence of coflowering species can reduce pollination success at a local scale because of reduced visitation of generalist pollinators to the focal species, decreased delivery of conspecific pollen, or stigma interference by heterospecific pollen (5-8). However, whether the number of competing species within broad geographic regions influences global patterns in pollination biology has not yet been examined.Adaptations for effective pollination are widely accepted to have contributed to the tremendous radiation of angiosperms (9, 10). Pollen limitation may decrease as plants evolve traits that reduce reliance on pollinators (e.g., self-compatible breeding systems and vegetative reproduction), attract more specialized pollinators that deliver less heterospecific pollen, or reduce competition for pollinators (e.g., shifts in flowering time) (11). Studies have found that diversity in flowering phenologies and pollinator fauna is indeed higher in species-rich areas (12, 13). If plants in species-rich regions are more often pollen limited than those in species-depauperate areas, they may experience relatively strong natural selection favoring traits that reduce pollen limitation, making current biodiversity hotspots an even more valuable global resource as centers for future adaptation and...

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Section: Methodsmentioning

confidence: 99%

Pollination decays in biodiversity hotspots

Vamosi

Knight

Steets

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

282

226

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“…It is well documented that plant population size (especially the participation of flowering plants) and density affect the number of visits per plant and visitation rate [49][50][51][52]. First of all, flower density may affect pollen limitation [53]. Burd [54] reported that 62% of 158 plants were pollen limited at least in some places.…”

Section: Ko Ze V (Sd) Tinf (Sd) Nf (Sd) V (Sd) Tinf (Sd) Nf (Sd)mentioning

confidence: 99%

Breeding system variability, pollination biology, and reproductive success of rare Polemonium caeruleum L. in NE Poland

et al. 2017

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Polemonium caeruleum (Polemoniaceae) represents a very interesting system of compatibility transition. Studies of its biological and ecological properties in the context of the breeding system of various populations may help to understand the evolutionary mechanism of this process. We investigated some aspects of the breeding system, diversity and foraging behavior of the visitors, and relationship between population properties and fruit set in three populations from NE Poland. We found distinct compatibility systems in two studied populations and showed that if a population is self-compatible (SC), selfing is mediated by insects via geitonogamous pollen transfer. Despite the population properties (compatibility, visitor diversity and activity, population size, density, or floral display), P. caeruleum is not pollen limited and pollinators are highly important as a key factor determining the high reproductive success. Visitor assemblages (including key pollinators, bumblebees, and honey bees) and their foraging behavior on inflorescences vary between the populations, which may influence differences in the breeding system. The selfincompatible population was visited by a more diverse group of insects from Hymenoptera, Diptera, Lepidoptera, Heteroptera, and Coeloptera, which may favor effective cross-pollen transfer, whereas the SC population was pollinated mainly by Apis mellifera, which may promote mixed-mating. Studies on a wider range of P. caeruleum populations are needed to determine selective factors responsible for compatibility transition.

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“…An adequate amount of good quality pollen to complete fertilization of available ovules is one of a variety of factors necessary for seed and fruit set [27,28,38], therefore any disorders in the male function is beginning to have repercussions on the individual reproductive success. The possible consequences of male function problems is a weakening of progeny vigor which in long-term perspective may even negatively apply to the population dynamics as has been confirmed for Ipomopsis aggregate (Pursh) V.E.…”

Section: Discussionmentioning

confidence: 99%

“…Different interdependent factors may influence pollen dispersal between individuals and among spatially separated populations, i.e. density of individuals and the activity of insect visitors are considered as most important [27][28][29][30][31][32][33]. Numerous studies have shown that plant reproductive problems are often a male-related and attributable to pollen production or quality, i.e.…”

Section: Introductionmentioning

confidence: 99%

Does vegetation impact on the population dynamics and male function in Anemone sylvestris L. (Ranunculaceae)? A case study in three natural populations of xerothermic grasslands

Denisow

Wrzesień

2015

Acta Soc Bot Pol

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In Poland, like in other parts of Central Europe, dry grasslands significantly contribute to the biodiversity of both fauna and flora. Anthropogenic pressure impair many species of xerothermic habitats, and several populations face an increased risk of extinction. The goal of the study was to define factors that may affect the size of wild populations of Anemone sylvestris L., a protected species in Poland, with both a short-and long-term perspective, and to examine the influence of vegetation changes on the density, the abundance of flowering and male function (pollen production, pollen viability), as well as seed set. In situ observations were performed in 2005-2006 and 2011-2012 in three populations located on the Lublin Upland, SE Poland. The reduction in population density and A. sylvestris blooming was exacerbated by the expansion of the shrubs, but not by Brachypodium pinnatum. Male characteristics of A. sylvestris, i.e. pollen amount per multi-staminate flowers or pollen viability appeared to decrease under pressure of shrub competition. Populations with limitation of male function had impaired degree of seed set. Various consequences for the functioning of populations within a metapopulation system can be expected due to substantial qualitative and quantitative disorders in pollen traits. It is crucial that successful recovery programs for A. sylvestris primary should aim to conserve and manage the habitat.

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Floral density, pollen limitation, and reproductive success in Trillium grandiflorum

Cited by 110 publications

References 35 publications

Pollination decays in biodiversity hotspots

Pollination decays in biodiversity hotspots

Breeding system variability, pollination biology, and reproductive success of rare Polemonium caeruleum L. in NE Poland

Does vegetation impact on the population dynamics and male function in Anemone sylvestris L. (Ranunculaceae)? A case study in three natural populations of xerothermic grasslands

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