Comparing distance-decay parameters: A novel test under pairwise dependence

Martín‐Devasa, Ramiro; Martínez‐Santalla, Sara; Gómez‐Rodríguez, Carola; Crujeiras, Rosa M.; Baselga, Andrés

doi:10.1016/j.ecoinf.2022.101894

Cited by 4 publications

(4 citation statements)

References 79 publications

(36 reference statements)

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“…Each standardized distance value ( d s ) was computed as d s = ( d i ‐min( d ))/(max( d )‐min( d )) where d i is the original spatial or climatic distance value, and d is the vector of all original spatial or climatic distances. Standardized spatial and climatic distance‐decay models were built fitting power‐law, negative exponential and Gompertz functions (Martín‐Devasa et al., 2022a) to the relationship between similarity and standardized spatial/climatic distances with the decay.model function of the R package betapart . The negative exponential model was selected for subsequent analyses as it showed the lowest AIC values in most cases (Tables S1 and S2 in Supplementary Material).…”

Section: Methodsmentioning

confidence: 99%

Dispersal limitation shapes distance‐decay patterns of European spiders at the continental scale

Martín‐Devasa,

Jiménez‐Valverde,

Leprieur

et al. 2024

Global Ecol Biogeogr

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AimTo assess the relative relevance of dispersal limitation and species sorting as drivers of spatial turnover between spider faunas of European territories.LocationContinental Europe.Time periodPresent.Major taxa studiedSpiders (Order Araneae).MethodsWe analysed how distance‐decay patterns differ between northern and southern Europe (broadly, territories covered vs. not covered by ice sheets during the last glacial maximum, respectively) in 15 spider families, using standardized distances to allow a direct comparison between parameters (i.e. slope and intercept) of climatic and spatial distance‐decay models. Thus, we assessed North–South differences in parameters of spatial and, independently, climatic distance‐decay models, and whether those differences are explained by family‐specific traits related to dispersal ability.ResultsClimatic and spatial distance‐decay patterns are very similar in northern Europe, where climatic and spatial distances are highly correlated. In contrast, slopes are steeper in spatial than in climatic distance‐decay curves in southern Europe, where climatic and spatial distances are decoupled. Moreover, family traits related to dispersal ability explained the North–South difference in spatial distance‐decay slopes, as well as the amount of nestedness‐resultant dissimilarity between southern and northern spider faunas.Main conclusionsOur results suggest that differences in beta diversity patterns between northern and southern Europe reflect the strength of dispersal limitation in spiders, which varies across families and leads to different degrees of disequilibrium with current climatic conditions depending on the taxon. Moreover, in the South of Europe, where spatial and climatic distances are uncorrelated, spatial distance‐decay models are steeper and have larger explanatory power than climatic distance‐decay models, which suggests that dispersal limitation is the main factor shaping current beta diversity patterns of European spiders at the continental scale.

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Section: Methodsmentioning

confidence: 99%

Dispersal limitation shapes distance‐decay patterns of European spiders at the continental scale

Martín‐Devasa,

Jiménez‐Valverde,

Leprieur

et al. 2024

Global Ecol Biogeogr

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“…We then fit two models of distance decay for the pairs of plots belonging to the same ecoregion and for those belonging to different ecoregions. We quantified the strength of the ecoregion effect by comparing the intercepts of the curves of distance decays (calculated for the whole community) for pairs of plots within and between ecoregions, which is a way of measuring the difference in community similarity at a null geographical distance, using the Zdep statistic (Martín-Devasa et al, 2022). This method is analogous to a t -test on model parameters, based on a site-block permutation test of the observations (nperm = 1,000).…”

Section: Methodsmentioning

confidence: 99%

Ectomycorrhizal fungi are influenced by ecoregion boundaries across Europe

Delhaye,

van der Linde,

Bauman

et al. 2024

Preprint

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Aim: Ecoregions and the distance decay in community similarity are fundamental concepts in biogeography and conservation biology that are well supported across plants and animals, but not fungi. Here we test the relevance of these concepts for ectomycorrhizal (ECM) fungi in temperate and boreal regions. Location: Europe. Time period: 2008 - 2015. Major taxa studied: Ectomycorrhizal fungi. Methods: We used a large dataset of ~ 24,000 ectomycorrhizas, assigned to 1,350 operational taxonomic units, collected from 129 forest plots via a standardised protocol. We investigated the relevance of ecoregion delimitations for ECM fungi through complementary methodological approaches based on distance decay models, multivariate analyses, and indicator species analyses. We then evaluated the effects of host tree and climate on the observed biogeographical distributions. Results: Ecoregions predict large-scale ECM fungal biodiversity patterns. This is partly explained by climate differences between ecoregions but independent from host tree distribution. Basidiomycetes in the orders Russulales and Atheliales and producing epigeous fruiting bodies, with potentially short-distance dispersal, show the best agreement with ecoregion boundaries. Host tree distribution and fungal abundance (as opposed to presence/absence only) are important to uncover biogeographical patterns in mycorrhizas. Main conclusions. Ecoregions are useful units to investigate eco-evolutionary processes in mycorrhizal fungal communities and for conservation decision-making that includes fungi.

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“…We then fit two models of distance decay for the pairs of plots belonging to the same ecoregion and for those belonging to different ecoregions. We quantified the strength of the ecoregion effect by comparing the intercepts of the curves of distance decays (calculated for the whole community) for pairs of plots within and between ecoregions, which is a way of measuring the difference in community similarity at a null geographical distance, using the Zdep statistic (Martín‐Devasa et al., 2022). This method is analogous to a t ‐test on model parameters, based on a site‐block permutation test of the observations (nperm = 1000).…”

Section: Methodsmentioning

confidence: 99%

Ectomycorrhizal fungi are influenced by ecoregion boundaries across Europe

Delhaye,

van der Linde,

Bauman

et al. 2024

Global Ecol Biogeogr

View full text Add to dashboard Cite

AimEcoregions and the distance decay in community similarity are fundamental concepts in biogeography and conservation biology that are well supported across plants and animals, but not fungi. Here we test the relevance of these concepts for ectomycorrhizal (ECM) fungi in temperate and boreal regions.LocationEurope.Time Period2008–2015.Major Taxa StudiedEctomycorrhizal fungi.MethodsWe used a large dataset of ~24,000 ectomycorrhizas, assigned to 1350 operational taxonomic units, collected from 129 forest plots via a standardized protocol. We investigated the relevance of ecoregion delimitations for ECM fungi through complementary methodological approaches based on distance decay models, multivariate analyses and indicator species analyses. We then evaluated the effects of host tree and climate on the observed biogeographical distributions.ResultsEcoregions predict large‐scale ECM fungal biodiversity patterns. This is partly explained by climate differences between ecoregions but independent from host tree distribution. Basidiomycetes in the orders Russulales and Atheliales and producing epigeous fruiting bodies, with potentially short‐distance dispersal, show the best agreement with ecoregion boundaries. Host tree distribution and fungal abundance (as opposed to presence/absence only) are important to uncover biogeographical patterns in mycorrhizas.Main ConclusionsEcoregions are useful units to investigate eco‐evolutionary processes in mycorrhizal fungal communities and for conservation decision‐making that includes fungi.

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Comparing distance-decay parameters: A novel test under pairwise dependence

Cited by 4 publications

References 79 publications

Dispersal limitation shapes distance‐decay patterns of European spiders at the continental scale

Dispersal limitation shapes distance‐decay patterns of European spiders at the continental scale

Ectomycorrhizal fungi are influenced by ecoregion boundaries across Europe

Ectomycorrhizal fungi are influenced by ecoregion boundaries across Europe

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