scholarly journals Ecological genomics of tropical trees: how local population size and allelic diversity of resistance genes relate to immune responses, cosusceptibility to pathogens, and negative density dependence

2017 ◽  
Vol 26 (9) ◽  
pp. 2498-2513 ◽  
Author(s):  
J. H. Marden ◽  
S. A. Mangan ◽  
M. P. Peterson ◽  
E. Wafula ◽  
H. W. Fescemyer ◽  
...  
Keyword(s):  
Immune Responses ◽  
Density Dependence ◽  
Population Size ◽  
Resistance Genes ◽  
Local Population ◽  
Allelic Diversity ◽  
Tropical Trees ◽  
Ecological Genomics ◽  
Negative Density Dependence

scholarly journals Interspecific Functional Convergence and Divergence and Intraspecific Negative Density Dependence Underlie the Seed-to-Seedling Transition in Tropical Trees

2016 ◽  
Vol 187 (1) ◽  
pp. 99-109 ◽  
Author(s):  
Maria Natalia Umaña ◽  
Jimena Forero-Montaña ◽  
Robert Muscarella ◽  
Christopher J. Nytch ◽  
Jill Thompson ◽  
...  
Keyword(s):  
Density Dependence ◽  
Tropical Trees ◽  
Functional Convergence ◽  
Negative Density Dependence ◽  
Convergence And Divergence

scholarly journals Spatial patterns reveal negative density dependence and habitat associations in tropical trees

Ecology ◽  
2011 ◽  
Vol 92 (9) ◽  
pp. 1723-1729 ◽  
Author(s):  
Robert Bagchi ◽  
Peter A Henrys ◽  
Patrick E Brown ◽  
David F. R. P Burslem ◽  
Peter J Diggle ◽  
...  
Keyword(s):  
Density Dependence ◽  
Spatial Patterns ◽  
Tropical Trees ◽  
Habitat Associations ◽  
Negative Density Dependence

scholarly journals Conspecific negative density dependence and why its study should not be abandoned

Ecosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Joseph A. LaManna ◽  
Scott A. Mangan ◽  
Jonathan A. Myers
Keyword(s):  
Density Dependence ◽  
Negative Density Dependence

scholarly journals Increasing water temperatures exacerbate the potential for density dependence in juvenile steelhead

2018 ◽  
Vol 75 (6) ◽  
pp. 897-907 ◽  
Author(s):  
Knut Marius Myrvold ◽  
Brian Patrick Kennedy
Keyword(s):  
Density Dependence ◽  
Water Temperature ◽  
Positive Relationship ◽  
Local Population ◽  
Negative Relationship ◽  
Skewed Distribution ◽  
Energetic Cost ◽  
Size Distributions ◽  
Local Densities ◽  
A1b Scenario

We studied the potential effects of predicted climate change on the energetic demands of juvenile steelhead (Oncorhynchus mykiss) and their consequences for local population size and structure in Idaho, USA. Projected increases in water temperature incurred on average a 10% higher energetic cost by 2040 (range 7.0%–12.5% among study reaches in the watershed) and a 16% increase (range 8.5%–21.3%) by 2080 following the A1B scenario. The predicted increase in energetic cost was largest in the coolest stream reaches, where the proportional increases in energetic cost exceed that of temperature. Energetically, and in absence of increases in food supply, local densities were consequently expected to decline. We examined which factors best described the shape of current size distributions to explore future size distributions as temperatures increase. Mass distribution skewness was best explained by local biomass (positive relationship) and water temperature (negative relationship). The results suggest that local steelhead cohorts will approach a platykurtic, slightly negatively skewed distribution with increasing temperatures and demonstrate that temperature can exacerbate demographic density dependence in fish populations.

scholarly journals Conspecific negative density dependence and why its study should not be abandoned

2020 ◽  
Author(s):  
Joseph A. LaManna ◽  
Scott A. Mangan ◽  
Jonathan A. Myers
Keyword(s):  
Density Dependence ◽  
Latitudinal Gradient ◽  
Null Model ◽  
Statistical Bias ◽  
Fitness Components ◽  
Density Dependent ◽  
Statistical Errors ◽  
Negative Density Dependence ◽  
Model Approach

AbstractRecent studies showing bias in the measurement of density dependence have the potential to sow confusion in the field of ecology. We provide clarity by elucidating key conceptual and statistical errors with the null-model approach used in Detto et al. (2019). We show that neither their null model nor a more biologically-appropriate null model reproduces differences in density-dependent recruitment between forests, indicating that the latitudinal gradient in negative density dependence is not an artefact of statistical bias. Finally, we suggest a path forward that combines observational comparisons of density dependence in multiple fitness components across localities with mechanistic and geographically-replicated experiments.

scholarly journals Are we missing the forest for the trees? Conspecific negative density dependence in a temperate deciduous forest

2021 ◽  
Author(s):  
Kathryn E. Barry ◽  
Stefan A. Schnitzer
Keyword(s):  
Life History ◽  
Density Dependence ◽  
Plant Community ◽  
Plant Diversity ◽  
Temperate Forest ◽  
Woody Plant ◽  
Community Level ◽  
Life History Strategies ◽  
Canopy Trees ◽  
Negative Density Dependence

AbstractOne of the central goals of ecology is to determine the mechanisms that enable coexistence among species. Evidence is accruing that conspecific negative density dependence (CNDD), the process by which plant seedlings are unable to survive in the area surrounding adults of their same species, is a major contributor to tree species coexistence. However, for CNDD to maintain diversity, three conditions must be met. First, CNDD must maintain diversity for the majority of the woody plant community (rather than merely specific groups). Second, the pattern of repelled recruitment must increase in with plant size. Third, CNDD must occurs across life history strategies and not be restricted to a single life history strategy. These three conditions are rarely tested simultaneously. In this study, we simultaneously test all three conditions in a woody plant community in a North American temperate forest. We examined whether the different woody plant growth forms (shrubs, understory trees, mid-story trees, canopy trees, and lianas) at different ontogenetic stages (seedling, sapling, and adult) were overdispersed – a spatial pattern indicative of CNDD – using spatial point pattern analysis across life history stages and strategies. We found that there was a strong signal of overdispersal at the community level. However, this pattern was driven by adult canopy trees. By contrast, understory plants, which can constitute up to 80% of temperate forest plant diversity, were not overdispersed as adults. The lack of overdispersal suggests that CNDD is unlikely to be a major mechanism maintaining understory plant diversity. The focus on trees for the vast majority of CNDD studies may have biased the perception of the prevalence of CNDD as a dominant mechanism that maintains community-level diversity when, according to our data, CNDD may be restricted largely to trees.

Shifts in species and phylogenetic diversity between sapling and tree communities indicate negative density dependence in a lowland rain forest

2010 ◽  
Vol 98 (1) ◽  
pp. 137-146 ◽  
Author(s):  
Mailyn A. Gonzalez ◽  
Aurélien Roger ◽  
Elodie A. Courtois ◽  
Franck Jabot ◽  
Natalia Norden ◽  
...  
Keyword(s):  
Density Dependence ◽  
Rain Forest ◽  
Phylogenetic Diversity ◽  
Lowland Rain Forest ◽  
Tree Communities ◽  
Negative Density Dependence
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