scholarly journals Pre-dispersal seed predation and pollen limitation constrain population growth across the geographic distribution ofAstragalus utahensis

2018 ◽  
Vol 106 (4) ◽  
pp. 1646-1659 ◽  
Author(s):  
Kathryn C. Baer ◽  
John L. Maron
Keyword(s):  
Population Growth ◽  
Geographic Distribution ◽  
Seed Predation ◽  
Pollen Limitation

Pre-dispersal seed predation by the weevils Trichapion rostrum and Tychius sordidus limits reproductive output of Baptisia alba (Fabaceae)

Botany ◽  
2017 ◽  
Vol 95 (8) ◽  
pp. 809-817 ◽  
Author(s):  
Ashley M. Hembrough ◽  
Victoria A. Borowicz
Keyword(s):  
Seed Production ◽  
Seed Predation ◽  
Reproductive Output ◽  
Pollen Limitation ◽  
Reproductive Potential ◽  
Prairie Restoration ◽  
Seed Number ◽  
Nutrient Supplementation ◽  
Perennial Legume ◽  
Herbaceous Perennial

Baptisia alba (L.) Vent., an herbaceous, perennial legume, produces more flowers than will mature into pods. Single-year experiments on two reconstructed prairies tested the hypothesis that reproductive potential of B. alba depends on nutrients, but pollen limitation and pre-dispersal seed predation by weevils reduce final production. Ramets were assigned one of four treatments that were combinations of fertilizer (none/70 g fertilizer twice) and insect barrier (none/application of Tanglefoot). Within inflorescences, flowers were naturally pollinated or supplemented with pollen. Fertilizer produced no effects, suggesting that B. alba are unresponsive within a season to nutrient supplementation. Pollen supplementation increased pod initiation at the two sites by 6.7% and 2.3%, respectively, but did not affect the proportion of initiated pods that matured or seed number within pods. Where Tychius sordidus occurred, only 67 pods matured on 19 ramets and only four seeds survived. Where only Trichapion rostrum was present, insect barrier increased pod maturation almost three-fold, but did not affect seed number within pods. Barrier treatment increased the reproductive output of entire ramets by increasing seed production, from 3.6 seeds·ramet−1 to 60.5 seeds·ramet−1. Prairie restoration frequently uses fruit collected from other populations. Managers should be careful to avoid the unintended introduction of voracious seed predators.

Pollen Limitation and Population Growth in a Herbaceous Perennial Legume

Ecology ◽  
1995 ◽  
Vol 76 (2) ◽  
pp. 652-656 ◽  
Author(s):  
Johan Ehrlen ◽  
Ove Eriksson
Keyword(s):  
Population Growth ◽  
Pollen Limitation ◽  
Perennial Legume ◽  
Herbaceous Perennial

scholarly journals Bracon zuleideae Perioto & Lara (Hymenoptera, Braconidae): seed predation potential, expansion of the geographic distribution and new data on host plant phenology

2019 ◽  
Vol 12 (3) ◽  
pp. 149-153
Author(s):  
Nelson Wanderley Perioto ◽  
Rogéria Inês Rosa Lara ◽  
Danielle Roberta Versuti
Keyword(s):  
Host Plant ◽  
Geographical Distribution ◽  
Geographic Distribution ◽  
Seed Predation ◽  
Minas Gerais ◽  
Plant Phenology ◽  
The State ◽  
Type Locality ◽  
Previous Record ◽  
First Time

Abstract. Here, by the first time, was quantified the predation of seeds of Protium ovatum Engl. (Burseraceae) by Bracon zuleideae Perioto & Lara (Hymenoptera, Braconidae), a phytophagous seed eater, in Parque Nacional Grande Sertão Veredas, located in the State of Minas Gerais, Brazil. B. zuleideae is now mentioned for the state of Minas Gerais, Brazil, which extends its geographical distribution about 900 km north of its type locality, its only previous record, and new data about host plant phenology are provided.Bracon zuleideae Perioto & Lara (Hymenoptera, Braconidae): potencial de predação de sementes, expansão da distribuição geográfica e novos dados de fenologia da planta hospedeiraResumo. A predação de sementes de Protium ovatum Engl. (Burseraceae) por Bracon zuleideae Perioto & Lara (Hymenoptera, Braconidae) foi quantificada pela primeira vez no Parque Nacional Grande Sertão Veredas, em Minas Gerais, Brasil. A distribuição geográfica de B. zuleideae é estendida para o Estado de Minas Gerais, Brasil, a cerca de 900 km ao norte da localidade tipo, o único registro anterior, e novos dados sobre a fenologia da planta hospedeira são fornecidos.

A synthesis of the demography of African acacias

2001 ◽  
Vol 17 (6) ◽  
pp. 871-886 ◽  
Author(s):  
J. J. MIDGLEY ◽  
W. J. BOND
Keyword(s):  
Life History ◽  
Population Growth ◽  
Seed Predation ◽  
Field Experiments ◽  
Anthropogenic Impacts ◽  
Climatic Variation ◽  
Adult Plant ◽  
Grass Seed ◽  
Size Classes

Although acacias are ecologically and economically important, their demography is poorly known. In part this is because few field experiments have been undertaken. Also, a bewildering diversity of factors have been suggested to determine their demography. These factors include disease, fire, large and small browsers and grazers, climatic variation, competition with grass, seed predation and anthropogenic impacts. This synthesis concentrates on the life-history period from seed to adult plant and indicates that important hurdles have been demonstrated for some species in some habitats. Seed and seedling limitation have not been clearly demonstrated, nor has the value of dispersal been quantified. In contrast, the impacts of herbivores and fire in affecting the escape or release of resprouts has been repeatedly demonstrated. Whether fire and herbivory merely slow down the rate of promotion through size-classes or actually prevent it, needs further work. We note that very little comparative work amongst Acacia species has taken place. Most studies have concentrated on single aspects of their life history (especially seed predation), and have not been analysed in relation to population growth. Few field experiments, especially concerning seedling biology, have been performed. We conclude with some suggestions of a framework for interpreting acacia demography.

scholarly journals Geographic Distribution of Habitat, Development, and Population Growth Rates of the Asian Citrus Psyllid,Diaphorina citri, in Mexico

2013 ◽  
Vol 13 (114) ◽  
pp. 1-17 ◽  
Author(s):  
José López-Collado ◽  
J. Isabel López-Arroyo ◽  
Pedro L. Robles-García ◽  
Magdalena Márquez-Santos
Keyword(s):  
Population Growth ◽  
Geographic Distribution ◽  
Growth Rates ◽  
Asian Citrus Psyllid ◽  
Diaphorina Citri ◽  
Population Growth Rates ◽  
Habitat Development

Pollen limitation and its effect on seed germination

2018 ◽  
Vol 28 (4) ◽  
pp. 253-260 ◽  
Author(s):  
Jerry M. Baskin ◽  
Carol C. Baskin
Keyword(s):  
Seed Germination ◽  
Population Growth ◽  
Seed Production ◽  
Seed Quality ◽  
Pollen Limitation ◽  
Growth Models ◽  
Germination Percentage ◽  
Positive Zero ◽  
Equal Weight ◽  
Population Growth Models

AbstractIn nature, fruit and seed production in many plants have been shown to be pollen limited. Pollen limitation is demonstrated when open-pollinated plants that are hand-supplemented (Ps) with outcross pollen produce more fruits and/or seeds than open-pollinated controls that are not hand-pollinated (Po). There are three categories of results in such studies: Ps> Po, Ps= Poand Ps< Po, in which case pollen limitation indices are positive, zero and negative, respectively. In an index widely used to calculate pollen limitation, 1 – (Po/Ps), the bounds for Ps≥ Poare 0 to + 1, whereas the bounds for Ps< Poare 0 to –∞. The first aim of this review was to show how the pollen limitation index can be modified so that the bounds of Ps< Poare 0 and –1, whereupon the index gives equal weight to the best performer (Psor Po) and worst performer (Psor Po). In addition to seed quantity, pollen supplementation can affect seed quality, including germinability. Thus, our second aim was to summarize the results of studies that have also tested the effect of pollen limitation on seed germination. In short, the 30 case studies in 15 families, 16 genera and 18 species that we identified show that seed germination percentage increased, was not affected or decreased by pollen supplementation in 12, 11 and seven cases, respectively. The effect of pollen limitation on seed germination, which can be quite large, has not been considered in developing population growth models to determine the effect of pollen limitation on λ.

Pollen limitation, seed predation and scape length in Primula farinosa

Oikos ◽  
2002 ◽  
Vol 97 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Johan Ehrlén ◽  
Sofia Käck ◽  
Jon Ågren
Keyword(s):  
Seed Predation ◽  
Pollen Limitation

Does pollen limitation affect population growth of the endangered Dracocephalum austriacum L.?

2014 ◽  
Vol 57 (1) ◽  
pp. 105-116 ◽  
Author(s):  
Sílvia Castro ◽  
Tomáš Dostálek ◽  
Sascha van der Meer ◽  
Gerard Oostermeijer ◽  
Zuzana Münzbergová
Keyword(s):  
Population Growth ◽  
Pollen Limitation
Sign in / Sign up

Export Citation Format

Share Document