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

Oecologia ◽  
2003 ◽  
Vol 137 (4) ◽  
pp. 557-563 ◽  
Author(s):  
Tiffany M. Knight
Keyword(s):  
Reproductive Success ◽  
Pollen Limitation ◽  
Trillium Grandiflorum ◽  
Floral Density

scholarly journals Pollination intensity and paternity in flowering plants

2019 ◽  
Vol 125 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Dorothy A Christopher ◽  
Randall J Mitchell ◽  
Jeffrey D Karron
Keyword(s):  
Reproductive Success ◽  
Pollen Limitation ◽  
Ecological Factors ◽  
Plant Evolution ◽  
Male Reproductive Success ◽  
Floral Display ◽  
Heritable Variation ◽  
Pollinator Visitation ◽  
Pollination Success ◽  
Siring Success

Abstract Background Siring success plays a key role in plant evolution and reproductive ecology, and variation among individuals creates an opportunity for selection to act. Differences in male reproductive success can be caused by processes that occur during two stages, the pollination and post-pollination phases of reproduction. In the pollination phase, heritable variation in floral traits and floral display affect pollinator visitation patterns, which in turn affect variation among plants in the amount of pollen exported and deposited on recipient stigmas. In the post-pollination phase, differences among individuals in pollen grain germination success and pollen tube growth may cause realized paternity to differ from patterns of pollen receipt. The maternal plant can also preferentially provision some developing seeds or fruits to further alter variation in siring success. Scope In this review, we describe studies that advance our understanding of the dynamics of the pollination and post-pollination phases, focusing on how variation in male fitness changes in response to pollen limitation. We then explore the interplay between pollination and post-pollination success, and how these processes respond to ecological factors such as pollination intensity. We also identify pressing questions at the intersection of pollination and paternity and describe novel experimental approaches to elucidate the relative importance of pollination and post-pollination factors in determining male reproductive success. Conclusions The relative contribution of pollination and post-pollination processes to variation in male reproductive success may not be constant, but rather may vary with pollination intensity. Studies that quantify the effects of pollination and post-pollination phases in concert will be especially valuable as they will enable researchers to more fully understand the ecological conditions influencing male reproductive success.

Introduced deer and the pollination and reproduction of an animal-pollinated herb

Botany ◽  
2010 ◽  
Vol 88 (2) ◽  
pp. 110-118 ◽  
Author(s):  
Diego P. Vázquez ◽  
Julie Gresser ◽  
Jean-Louis Martin
Keyword(s):  
Reproductive Success ◽  
Population Density ◽  
Relative Density ◽  
Pollen Limitation ◽  
Odocoileus Hemionus ◽  
Pollen Deposition ◽  
Herbaceous Species ◽  
Haida Gwaii ◽  
Absolute Density ◽  
Odocoileus Hemionus Sitkensis

We evaluated the hypothesis that the modified population density of Aquilegia formosa Fisch. ex DC. (Ranunculaceae) resulting from the introduction of Sitka black-tailed deer ( Odocoileus hemionus sitkensis ) in the Haida Gwaii archipelago affects the pollination and reproductive performance of this herbaceous species. We compared the population density, pollination, and reproductive success of A. formosa among three small islands colonized by deer and three deer-free islands. Islands with deer had a substantially lower absolute density and a greater relative density of A. formosa than deer-free islands. The presence of deer was associated with higher pollen deposition, which probably resulted from the greater relative density of A. formosa on islands with deer. However, the presence of deer had no significant effect on individual reproductive success. The latter result is likely a consequence of the lack of pollen limitation in this species, as well as of the conflicting relationship between the absolute and relative densities of A. formosa and the presence of deer.

scholarly journals Effect of Resource Reallocation on Pollen Limitation and Reproductive Assurance of Apocynum venetum L. in an Arid Region

2016 ◽  
Vol 8 (9) ◽  
pp. 95 ◽  
Author(s):  
Min Chen ◽  
Xue-yong Zhao ◽  
Xiao-an Zuo ◽  
Hao Qu ◽  
Wei Mao ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Pollen Limitation ◽  
Reproductive Assurance ◽  
Resource Reallocation ◽  
Strong Force ◽  
Whole Plant ◽  
Apocynum Venetum ◽  
Single Flower ◽  
Plant Pollen

<p>Pollen limitation is considered to be a strong force driving the evolution of reproductive strategies in flowering plants. However, resource reallocation may occur among seeds because of variation in the quantity or quality of pollen received. We performed single-flower and whole-plant pollen supplementation and emasculation of flowers of <em>Apocynum venetum</em> L. to estimate pollen limitation and reproductive assurance. In addition, we calculated the visiting patterns of the pollinators, frequency of pollinators to estimate the effect of pollinator activity and further on the reproductive success of <em>A. venetum</em>. Our results indicated estimates from single-flower manipulations were not biased, closely resembling those from whole-plant manipulations. We found<em> Apis mellifera</em> was the dominant pollinator during the pollination process. In addition, insect pollination played a more important role in the outcrossing system, which could explain the differences in reproductive success. Our results also showed that autonomous self-pollination eliminates pollen limitation and provides reproductive assurance.</p>

Pollen limitation and reproduction varies with population size in experimental populations of Sabatia angularis (Gentianaceae)

Botany ◽  
2009 ◽  
Vol 87 (3) ◽  
pp. 330-338 ◽  
Author(s):  
Rachel B. Spigler ◽  
Shu-Mei Chang
Keyword(s):  
Reproductive Success ◽  
Population Size ◽  
Intraspecific Competition ◽  
Seed Set ◽  
Pollen Limitation ◽  
Small Populations ◽  
Plant Populations ◽  
Large Populations ◽  
Fruit And Seed Set ◽  
Supplemental Pollination

Individuals in large plant populations are expected to benefit from increased reproductive success relative to those in small populations because of the facilitative effects of large aggregations on pollination. As populations become small, the inability to attract sufficient numbers of pollinators can reduce reproduction via pollen limitation. This study experimentally tested whether such trends occur for the herbaceous biennial Sabatia angularis (L.) Pursh (Gentianaceae). We created artificial populations of varying size consisting of potted S. angularis plants in two field sites to determine whether population size affected mean fruit and seed set. We also examined whether population size affected the degree of pollen limitation using a supplemental pollination design in one of the sites. Our results showed that, on average, seed set was lower in large populations, not small populations, of S. angularis and that this result may be due to increased pollen limitation in large populations. We suggest that in certain contexts, small populations may enjoy reproductive advantages over large populations by escaping intraspecific competition for pollinators.

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