Spatiotemporal Demographic Processes in Plant Populations: An Approach and a Case Study

1990 ◽  
Vol 135 (3) ◽  
pp. 382-397 ◽  
Author(s):  
Ronen Kadmon ◽  
Avi Shmida
Keyword(s):  
Plant Populations ◽  
Demographic Processes

scholarly journals Dispersals as demographic processes: testing and describing the spread of the Neolithic in the Balkans

2020 ◽  
Vol 376 (1816) ◽  
pp. 20200231 ◽  
Author(s):  
Marc Vander Linden ◽  
Fabio Silva
Keyword(s):  
Food Production ◽  
Population History ◽  
Early Neolithic ◽  
Theme Issue ◽  
Radiocarbon Dates ◽  
The Balkans ◽  
Demographic Processes ◽  
South Eastern Europe ◽  
Density Dependent Dispersal

Although population history and dispersal are back at the forefront of the archaeological agenda, they are often studied in relative isolation. This contribution aims at combining both dimensions, as population dispersal is, by definition, a demographic process. Using a case study drawn from the Early Neolithic of South-Eastern Europe, we use radiocarbon dates to jointly investigate changes in speed and population size linked to the new food production economy and demonstrate that the spread of farming in this region corresponds to a density-dependent dispersal process. The implications of this characterization are evaluated in the discussion. This article is part of the theme issue ‘Cross-disciplinary approaches to prehistoric demography’.

scholarly journals Do plant populations on distinct inselbergs talk to each other? A case study of genetic connectivity of a bromeliad species in an Ocbil landscape

2017 ◽  
Vol 7 (13) ◽  
pp. 4704-4716 ◽  
Author(s):  
Karina Vanessa Hmeljevski ◽  
Alison Gonçalves Nazareno ◽  
Marcelo Leandro Bueno ◽  
Maurício Sedrez dos Reis ◽  
Rafaela Campostrini Forzza
Keyword(s):  
Genetic Connectivity ◽  
Plant Populations

scholarly journals Hybridization can facilitate species invasions, even without enhancing local adaptation

2016 ◽  
Vol 113 (36) ◽  
pp. 10210-10214 ◽  
Author(s):  
Mohsen B. Mesgaran ◽  
Mark A. Lewis ◽  
Peter K. Ades ◽  
Kathleen Donohue ◽  
Sara Ohadi ◽  
...  
Keyword(s):  
Leading Edge ◽  
Allee Effects ◽  
Plant Populations ◽  
Individual Fitness ◽  
Founding Population ◽  
Species Invasions ◽  
Cakile Maritima ◽  
Model Predictions ◽  
Cakile Edentula

The founding population in most new species introductions, or at the leading edge of an ongoing invasion, is likely to be small. Severe Allee effects—reductions in individual fitness at low population density—may then result in a failure of the species to colonize, even if the habitat could support a much larger population. Using a simulation model for plant populations that incorporates demography, mating systems, quantitative genetics, and pollinators, we show that Allee effects can potentially be overcome by transient hybridization with a resident species or an earlier colonizer. This mechanism does not require the invocation of adaptive changes usually attributed to invasions following hybridization. We verify our result in a case study of sequential invasions by two plant species where the outcrosser Cakile maritima has replaced an earlier, inbreeding, colonizer Cakile edentula (Brassicaceae). Observed historical rates of replacement are consistent with model predictions from hybrid-alleviated Allee effects in outcrossers, although other causes cannot be ruled out.

scholarly journals Historical hydropower projects and demographic processes Case study municipality of Mali Zvornik

2017 ◽  
pp. 53-71
Author(s):  
Rajko Golić ◽  
Marko Joksimović ◽  
Dejan Šabić
Keyword(s):  
Demographic Processes

Seeing the wood and the trees—predicting the future for fragmented plant populations in Australian landscapes

2007 ◽  
Vol 55 (3) ◽  
pp. 250 ◽  
Author(s):  
Linda Broadhurst ◽  
Andrew Young
Keyword(s):  
Rare Species ◽  
Reproductive Strategy ◽  
Plant Populations ◽  
Widespread Species ◽  
Current State ◽  
Considerable Research ◽  
Demographic Processes ◽  
New Challenges ◽  
Taxonomic Groups

Australian landscapes face significant environmental challenges in the coming decade. The fragmentation of vegetation following broadscale land-clearing has rapidly altered critical genetic and demographic processes within and among the remnants that still reside in these landscapes. These perturbations threaten the long-term persistence of many species. Although considerable research has been directed towards the management of rare species, little is understood about how common and widespread species respond to these new challenges. In this paper we review the current state of knowledge regarding species biology for some key Australian taxonomic groups to develop broad predictions about the major threats to species persistence, particularly for some of the most common and widespread floral components of fragmented Australian landscapes. The main focus is on associations between reproductive strategy, vulnerability to demographic and genetic threats, and implications for fecundity.

Use Categories and Local Perception of Decline in Plant Populations: a Case Study of Woody Medicinal Plants in Northeastern Brazil

2020 ◽  
Vol 74 (3) ◽  
pp. 356-362
Author(s):  
Edgar Caliento Barbosa ◽  
Ramon Salgueiro Cruz ◽  
Gabriela Maria Cota dos Santos ◽  
Rafael Ricardo Vasconcelos da Silva ◽  
Ulysses Paulino de Albuquerque ◽  
...  
Keyword(s):  
Medicinal Plants ◽  
Northeastern Brazil ◽  
Plant Populations ◽  
Local Perception ◽  
Use Categories

scholarly journals An Analysis of the Distribution of Seed Size: A Case Study of the Gymnosperms

2012 ◽  
Vol 40 (2) ◽  
pp. 46 ◽  
Author(s):  
Lorentz JANTSCHI ◽  
Rodica C. SOBOLU ◽  
Sorana D. BOLBOACÄ‚
Keyword(s):  
Extreme Values ◽  
Seed Morphology ◽  
Logistic Distribution ◽  
Distribution Analysis ◽  
Phylogenetic Information ◽  
Plant Populations ◽  
Distribution Laws ◽  
Seed Width ◽  
Best Fit

Seed morphology is one of the most addressed issues in seeding plants studies due to its importance in the propagation of seeding plants, which can be related to the influence of the environment of the genetic structure in plant populations. A distribution analysis was conducted on extreme values (minimum and maximum) of seed width and length for gymnosperms spread within the Carpathian Mountains region. Combining the probabilities from independent tests successfully limited the best-fit distribution to a small number of distribution laws. Analyses revealed that the extreme values of investigated seed width and length best fit a log-logistic distribution or one of its generalised forms. The left-weighting of the distribution (to small sizes) revealed a better adaptation of small-sized seeding species. The extreme values of seed dimensions could be used to predict the dimension of a random observation, while the composition of the seeds, which is related to dimension, could provide phylogenetic information.

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