How does habitat filtering affect the detection of conspecific and phylogenetic density dependence?

Wu, Junjie; Swenson, Nathan G.; Brown, Calum; Zhang, Caicai; Yang, Jie; Ci, Xiuqin; Li, Jie; Sha, Liqing; Cao, Min; Lin, Luxiang

doi:10.1890/14-2465

Cited by 15 publications

(31 citation statements)

References 54 publications

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“…That is, having similar heterospecific neighbours results in higher survival rates for the focal individual (Wu et al . ), which may be more important for performance differences and competitive exclusion than niche differences. In sum, present and past analyses indicate that heterospecific negative interactions are far weaker in this forest and that the strong negative intra‐specific interactions affiliated with genetic relatedness likely play a dominant role in regulating populations and, therefore, promoting coexistence.…”

Section: Discussionmentioning

confidence: 99%

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Intra‐specific relatedness, spatial clustering and reduced demographic performance in tropical rainforest trees

et al. 2018

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Intra-specific negative density dependence promotes species coexistence by regulating population sizes. Patterns consistent with such density dependence are frequently reported in diverse tropical tree communities. Empirical evidence demonstrating whether intra-specific variation is related to these patterns, however, is lacking. The present study addresses this important knowledge gap by genotyping all individuals of a tropical tree in a long-term forest dynamics plot in tropical China. We show that related individuals are often spatially clustered, but having closely related neighbours reduces the growth performance of focal trees. We infer from the evidence that dispersal limitation and negative density dependence are operating simultaneously to impact the spatial distributions of genotypes in a natural population. Furthermore, dispersal limitation decreases local intra-specific genetic diversity and increases negative density dependence thereby promoting niche differences and species coexistence as predicted by theory.

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Section: Discussionmentioning

confidence: 99%

“…; Wu et al . ). Indeed, in perhaps the most extensive study to date scaling heterospecific neighbourhood similarity by functional trait data (Kunstler et al .…”

Section: Introductionmentioning

confidence: 97%

Intra‐specific relatedness, spatial clustering and reduced demographic performance in tropical rainforest trees

et al. 2018

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“…In our study, the model with variable neighbourhood radius was the most likely model (Appendix S4), supporting this expectation. A fixed radius (based on AIC of candidate models) has often been used to calculate conspecific, heterospecific and phylogenetic neighbourhood effects, with little attention on effects of varying neighbourhood radii Piao et al 2013;Johnson et al 2014;Lin et al 2014;Lu et al 2015;Zhu et al 2015b;Wu et al 2016). However, different neighbourhood radii could result in different density-dependent effect sizes or sign, and thus influence the comparison of density-dependent effects within and among studies Zhu et al 2015b).…”

Section: Interspecific Variation In the Effect Of Neighbourhood Variamentioning

confidence: 99%

“…Spatial scale appears to influence detectability of topographic effects; we could only detect significant spatial variation in topographic effects at the standard quadrat scale (Table 2). In recent years, researchers have often modelled tree survival and then analysed the effects of biotic and abiotic factors and mechanisms of species co-existence only at the individual scale (Queenborough et al 2009;Bai et al 2012;Lin et al 2012Lin et al , 2014Wang et al 2012;Piao et al 2013;Johnson et al 2014;Lu et al 2015;Zhu et al 2015b;Wu et al 2016). As the spatial autocorrelation among the response variables increased, the number of topographic variables whose effect significantly varied over space increased (Table 2) in this study, so it seems that the spatial variation in the effect of topography on survival may be scale-dependent, suggesting that spatial scale should not be ignored when analysing the relative importance of topographic factors on survival.…”

Section: Spatial Variation In the Effect Of Topographic Variablesmentioning

confidence: 99%

Variation of the biotic neighbourhood and topographic effects on tree survival in an old‐growth temperate forest

Zhu

Cai

Jiang

et al. 2017

J Vegetation Science

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Aims Tree mortality can determine forest dynamics and succession, alter nutrient cycling and contribute to tree species co‐existence. Understanding the mechanisms that maintain species diversity is a central goal of community ecology. In this study, we incorporated survival data from a 10‐yr interval census to determine whether there is significant interspecies variation in the effects of biotic neighbourhood variables and whether there is significant spatial variation in the effects of topographic variables on tree survival in a broadleaved‐Korean pine temperate forest. Location Temperate forest, northeast China. Methods We used GLMM and geographically weighted GLM as well as their corresponding test approaches to determine whether there is significant interspecies variation in the effects of biotic neighbourhood variables over variable neighbourhood radii and whether there is significant spatial variation in the effects of topographic variables on tree survival across multiple spatial scales in an old‐growth temperate forest dynamics plot in northeast China. Results Our results showed that the effects of neighbourhood variables on tree survival varied among species and effects of topography varied over space. However, the results depended on the neighbourhood radius and spatial scale. The neighbourhood radius affected detection of variation in neighbourhood effects among species, and the spatial scale similarly affected detection of spatial variation in the effects of topography. The effect of conspecific neighbour density on survival varied more widely among species than that of the average phylogenetic dissimilarity of heterospecific neighbours, regardless of the neighbourhood radius. Moreover, the effect of elevation varied more widely over space than those of convexity and hill shade at any quadrat scale. Conclusions Our findings highlight that future studies should account for variations in the neighbourhood radius among species and/or circumstances as well as the spatial scale when assessing factors that contribute to species co‐existence in long‐lived organisms. Species leaf phenology, shade and drought tolerance and environmental filtering may explain these variations in the effects of neighbourhood and topographic variables on tree survival. Overall, our results indicate that both density dependence and resource niche partitioning are important mechanisms for maintaining biodiversity in this broad‐leaved Korean pine temperate forest.

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“…Susceptibility to conspecific density may be influenced by each species-specific life-history traits, such as shade tolerance, resistance to herbivores (Kobe & Vriesendorp, 2011) or high additive genetic diversity in genes associated with immune responses (Marden et al, 2017). Other factors like soil nutrients (LaManna, Walton, Turner & Myers, 2016), diversity and abundance of soil pathogens (Bagchi et al, 2010), habitat heterogeneity, interspecific competition, and heterospecific neighborhoods (Du et al, 2017;Wu et al, 2016;Zhu et al, 2015) could also affect a species tolerance to high conspecific densities. Hence, CNDD will only regulate diversity when a species self-regulation is stronger relative to the regulating effects of the environment or its interspecific interactions (LaManna et al, 2017).…”

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confidence: 99%

The effect of conspecific density, herbivory, and bamboo on seedling dynamics of a dominant oak in a Neotropical highland forest

et al. 2019

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Conspecific negative density dependence (CNDD) is one of the main mechanisms influencing diversity maintenance in tropical forests. Tropical highland forests, in contrast to most lowland forests, are commonly dominated by a few tree species, and 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 effect of CNDD regulation on seedling survival and recruitment of Quercus costaricensis, a monodominant oak in the Talamanca highland forests of Costa Rica. We used Ripley's K and generalized linear mixed models to test the effects of conspecific density, distance to the nearest adult, density of Chusquea bamboo shoots, and herbivory on the annual survival probability of 3579 seedlings between 2014 and 2017. We did not find a significant effect of CNDD on seedling survival. However, bamboo density and herbivory both significantly decreased oak seedling survival. All seedlings had signs of herbivory and predator satiation may explain the lack of density dependent regulation in seedlings of this species. We argue that the lack of intraspecific density regulation at the seedling stage may contribute to explain the dominance of Q. costaricensis in the highland forests of Costa Rica. Local seedling dynamics of this endemic oak are instead regulated by herbivory and the density of Chusquea. Abstract in Spanish is available with online material.

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How does habitat filtering affect the detection of conspecific and phylogenetic density dependence?

Cited by 15 publications

References 54 publications

Intra‐specific relatedness, spatial clustering and reduced demographic performance in tropical rainforest trees

Intra‐specific relatedness, spatial clustering and reduced demographic performance in tropical rainforest trees

Variation of the biotic neighbourhood and topographic effects on tree survival in an old‐growth temperate forest

The effect of conspecific density, herbivory, and bamboo on seedling dynamics of a dominant oak in a Neotropical highland forest

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