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 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

Costs and benefits of masting: economies of scale are not reduced by negative density‐dependence in seedling survival in Sorbus aucuparia

2021 ◽  
Author(s):  
Barbara Seget ◽  
Michał Bogdziewicz ◽  
Jan Holeksa ◽  
Mateusz Ledwoń ◽  
Fiona Milne‐Rostkowska ◽  
...  
Keyword(s):  
Density Dependence ◽  
Economies Of Scale ◽  
Seedling Survival ◽  
Costs And Benefits ◽  
Sorbus Aucuparia ◽  
Negative Density Dependence

scholarly journals Scale‐dependent effects of conspecific negative density dependence and immigration on biodiversity maintenance

Oikos ◽  
2020 ◽  
Vol 129 (7) ◽  
pp. 1072-1083 ◽  
Author(s):  
Felix May ◽  
Thorsten Wiegand ◽  
Andreas Huth ◽  
Jonathan M. Chase
Keyword(s):  
Density Dependence ◽  
Biodiversity Maintenance ◽  
Negative Density Dependence

Seedling recruitment patterns in a 20 ha subtropical forest plot: hints for niche-based processes and negative density dependence

2011 ◽  
Vol 131 (2) ◽  
pp. 453-461 ◽  
Author(s):  
Yue Bin ◽  
Guojun Lin ◽  
Buhang Li ◽  
Linfang Wu ◽  
Yong Shen ◽  
...  
Keyword(s):  
Density Dependence ◽  
Seedling Recruitment ◽  
Subtropical Forest ◽  
Forest Plot ◽  
Negative Density Dependence ◽  
Recruitment Patterns

scholarly journals Comment on “Plant diversity increases with the strength of negative density dependence at the global scale”

Science ◽  
2018 ◽  
Vol 360 (6391) ◽  
pp. eaar4685 ◽  
Author(s):  
Ryan A. Chisholm ◽  
Tak Fung
Keyword(s):  
Density Dependence ◽  
Plant Diversity ◽  
Global Scale ◽  
Negative Density Dependence
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