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

LaManna, Joseph A.; Mangan, Scott A.; Alonso, Alfonso; Bourg, Norman A.; Brockelman, Warren Y.; Bunyavejchewin, Sarayudh; Chang, Li‐Wan; Chiang, Jyh‐Min; Chuyong, George B.; Clay, Keith; Cordell, Susan; Davies, Stuart J.; Furniss, Tucker J.; Giardina, Christian P.; Gunatilleke, I. A. U. N.; Gunatilleke, C. V. S.; He, Fangliang; Howe, Robert W.; Hubbell, Stephen P.; Hsieh, Chang‐Fu; Inman‐Narahari, Faith; Janík, David; Johnson, Daniel J.; Kenfack, David; Körte, Lisa; Král, Kamil; Larson, Andrew J.; Lutz, James A.; McMahon, Sean M.; McShea, William J.; Memiaghe, Hervé R.; Nathalang, Anuttara; Novotný, Vojtěch; Ong, Perry S.; Orwig, David A.; Ostertag, Rebecca; Parker, Geoffrey G.; Phillips, Richard P.; Sack, Lawren; Sun, I‐Fang; Tello, J. Sebastián; Thomas, Duncan W.; Turner, Benjamín L.; Díaz, Dilys M. Vela; Vrška, Tomáš; Weiblen, George D.; Wolf, Amy; Yap, Sandra L.; Myers, Jonathan A.

doi:10.1126/science.aar5245

Cited by 10 publications

(20 citation statements)

References 16 publications

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“…However, adding the offset value to all quadrats did not qualitatively change either the relationship between species rarefied richness and CNDD across latitudes (r = −0.877, P < 0.001) or the latitudinal shift in the relationship between CNDD and species abundance (r = −0.552, P = 0.006). Moreover, these findings persisted when we used an alternative distance-weighted approach to estimate CNDD that avoids the use of an offset altogether (11). Therefore, the main findings of our original paper are robust to the statistical approach used to estimate CNDD.…”

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confidence: 53%

“…These distances are well within average dispersal kernels for tree species (6,9). Therefore, we applied an offset value to quadrats with recruits but no conspecific adults, so as to ensure that these recruits remained in the calculation of CNDD and to avoid bias that results from excluding these recruits (1,10,11). However, adding the offset value to all quadrats did not qualitatively change either the relationship between species rarefied richness and CNDD across latitudes (r = −0.877, P < 0.001) or the latitudinal shift in the relationship between CNDD and species abundance (r = −0.552, P = 0.006).…”

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confidence: 99%

“…The results of this null-model analysis using the distance-weighted measure of adult abundance [described briefly above and presented in detail in (11)] are shown in Figs. 2 and 3.…”

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confidence: 99%

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

LaManna

Mangan

Alonso

et al. 2018

Science

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Hülsmann and Hartig suggest that ecological mechanisms other than specialized natural enemies or intraspecific competition contribute to our estimates of conspecific negative density dependence (CNDD). To address their concern, we show that our results are not the result of a methodological artifact and present a null-model analysis that demonstrates that our original findings-(i) stronger CNDD at tropical relative to temperate latitudes and (ii) a latitudinal shift in the relationship between CNDD and species abundance-persist even after controlling for other processes that might influence spatial relationships between adults and recruits.

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confidence: 53%

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confidence: 99%

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

LaManna

Mangan

Alonso

et al. 2018

Science

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“…Differences in conspecific negative density dependence (CNDD) between a tropical (BCI, Panama) and temperate (SERC, USA) forest. Observed results (red lines) are compared to null‐expected results from 1000 iterations of the relabeling model (Detto et al 2019; gray histograms) and the dispersal‐kernel model described in the text (modified from LaManna et al 2018 a , b ; blue histograms). (A) Observed median CNDD at BCI was greater than median CNDD expected from both null models ( P < 0.001).…”

Section: Inference In Observational Studies: the Importance Of Statismentioning

confidence: 99%

“…(C and D) Neither null model reproduced the observed difference in median CNDD between tropical and temperate forests using (C) all species ( P < 0.001), (D) only rare species (species with < 0.1 m 2 /ha basal area; P = 0.001), or only common species (>0.1 m 2 /ha basal area; P = 0.007, this result not shown). Ricker models and distance‐weighted adult abundances were used in all analyses because they generated less bias in benchmark tests (LaManna et al 2017, 2018 b ).…”

Section: Inference In Observational Studies: the Importance Of Statismentioning

confidence: 99%

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

2021

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Recent 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 null-model approaches used in recent studies of density dependence. Importantly, we show that neither a relabeling null model nor a more biologically appropriate null model reproduces differences in density-dependent recruitment between tropical and temperate forests, indicating that the latitudinal gradient in negative density dependence is not an artifact of statistical bias. We also suggest a path forward that combines observational comparisons of density dependence in multiple fitness components across localities with mechanistic and geographically replicated experiments.

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Interactions with soil fungi alter density dependence and neighborhood effects in a locally abundant dipterocarp species

Segnitz

Russo

Peay

2022

Ecology and Evolution

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Seedling recruitment can be strongly affected by the composition of nearby plant species. At the neighborhood scale (on the order of tens of meters), adult conspecifics can modify soil chemistry and the presence of host microbes (pathogens and mutualists) across their combined canopy area or rooting zones. At local or small spatial scales (on the order of one to few meters), conspecific seed or seedling density can influence the strength of intraspecific light and resource competition and also modify the density‐dependent spread of natural enemies such as pathogens or invertebrate predators. Intrinsic correlation between proximity to adult conspecifics (i.e., recruitment neighborhood) and local seedling density, arising from dispersal, makes it difficult to separate the independent and interactive factors that contribute to recruitment success. Here, we present a field experiment in which we manipulated both the recruitment neighborhood and seedling density to explore how they interact to influence the growth and survival of Dryobalanops aromatica, a dominant ectomycorrhizal tree species in a Bornean tropical rainforest. First, we found that both local seedling density and recruitment neighborhood had effects on performance of D. aromatica seedlings, though the nature of these impacts varied between growth and survival. Second, we did not find strong evidence that the effect of density on seedling survival is dependent on the presence of conspecific adult trees. However, accumulation of mutualistic fungi beneath conspecifics adults does facilitate establishment of D. aromatica seedlings. In total, our results suggest that recruitment near adult conspecifics was not associated with a performance cost and may have weakly benefitted recruiting seedlings. Positive effects of conspecifics may be a factor facilitating the regional hyperabundance of this species. Synthesis: Our results provide support for the idea that dominant species in diverse forests may escape the localized recruitment suppression that limits abundance in rarer species.

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

Cited by 10 publications

References 16 publications

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

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

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

Interactions with soil fungi alter density dependence and neighborhood effects in a locally abundant dipterocarp species

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