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 Lack of negative density-dependence regulation in a dominant oak tree from a neotropical highland forest

2018 ◽  
Author(s):  
Irene Calderón-Sanou ◽  
Luis Diego Ríos ◽  
Alfredo Cascante-Marín ◽  
Gilbert Barrantes ◽  
Eric J. Fuchs
Keyword(s):  
Costa Rica ◽  
Density Dependence ◽  
Species Coexistence ◽  
Local Density ◽  
Seedling Survival ◽  
Forest Composition ◽  
Adult Density ◽  
Conspecific Density ◽  
Negative Density Dependence ◽  
Highland Forests

AbstractConspecific negative density-dependence(CNDD) is one of the main mechanisms proposed to regulate species coexistence. Tropical highland forests, in contrast to diverse lowland forests, are commonly dominated by a few tree species. Testing the importance of density-dependence effects on seedling establishment of dominant trees may provide insights on the mechanisms regulating population dynamics and forest composition of tropical highlands. We tested the importance of CNDD regulation on seedling survival and recruitment ofQuercus costaricensis, a monodominant oak in the Talamanca highland forests of Costa Rica. We used spatial statistics and generalized linear mixed models to test the effects of conspecific density, distance to the nearest adult, density ofChusqueabamboo shoots, and herbivory on the annual survival probability of 3538 seedlings between 2014 and 2017. We did not find any effect of CNDD on seedling survival. However, bamboo density and herbivory both significantly decreased seedling survival. All seedlings had signs of herbivory and predator satiation may explain the lack of density dependent regulation in this species. We argue that the lack of intraspecific density regulation at the seedling stage may explain the dominance ofQ. costaricensisin the highland forests of Costa Rica. Local density of this endemic oak is instead regulated by herbivory and the density ofChusquea.

Effects of forest fragmentation on the recruitment success of the tropical tree Poulsenia armata at Los Tuxtlas, Veracruz, Mexico

2014 ◽  
Vol 30 (3) ◽  
pp. 209-218 ◽  
Author(s):  
Jenny Zambrano ◽  
Rosamond Coates ◽  
Henry F. Howe
Keyword(s):  
Density Dependence ◽  
Seedling Survival ◽  
Abiotic Factors ◽  
Forest Fragments ◽  
Los Tuxtlas ◽  
Recruitment Success ◽  
Continuous Forest ◽  
Adult Trees ◽  
Negative Density Dependence ◽  
Survival And Growth

Abstract:Recruitment success of individual plants is limited by an array of biotic and abiotic factors. Seedling survival may experience high mortality due to negative density dependence or altered microclimatic conditions. This study reports regeneration of Poulsenia armata (Moraceae), in the fragmented landscape of the Los Tuxtlas region in south-eastern Mexico. Density, survival and growth of seedlings (<1 y) and juveniles (<150 cm height) of P. armata were predicted to be significantly lower in forest fragments compared with extensive continuous forest. Contrary to expectation, density did not vary between habitats; however, we found twice the number of seedlings (n = 82) in forest fragments than in the continuous forest (n = 35). Forest fragments were associated with higher seedling densities close to adult trees. Unexpectedly, we found no evidence for negative density dependence in plant survival or growth. Survival and growth of P. armata were negatively impacted in forest fragments, with desiccation by warmer daily temperatures likely the cause of mortality, independent of density. Of the 111 individuals recorded in 2010 in forest fragments, 38% died over 2 y of census (n = 42), while 9% (n = 12) of the 127 individuals from the continuous forest died. Higher rates of mortality suggest that conditions in forest fragments are detrimental to seedling cohorts over time. Low juvenile recruitment jeopardizes persistence of P. armata, in fragmented populations of this rain-forest tree.

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

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
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