Urban soil biota can be surprisingly diverse and recent studies hypothesize that such biodiversity is partly due to stochastic community dynamics caused by fragmentation and high environmental variability. We aimed to quantify the relative effects of these factors on the community structure of soil oribatid mites inhabiting holm oak woodlands in two Mediterranean cities. We partitioned the community variation into fractions uniquely attributable to gradients in soil abiotic properties, pollution, microbiological properties, and spatial and temporal variation that could not be related to measured soil factors. As we found strong spatial structure at the local scales, a neutral model was fitted to test whether beta diversity patterns of relatively isolated communities were consistent with a purely stochastic assembly process. The overall diversity of the assemblage was remarkable: a total of 124 species were identified and rarefaction curves demonstrated that urban parks are as rich in species as their counterpart woodlands in suburban areas. The fraction of variation explainable in terms of soil properties, microbiology and pollution was statistically significant but surprisingly low. At the site scale, patterns of beta diversity (i.e. spatial turnover in species composition and relative abundances) were not significantly different from those predicted by neutral models. Stochastic models can parsimoniously predict background levels of urban soil biodiversity at local scales, while disturbance and environmental variation still play some significant but not major role at broader scales.

Caruso, T., Migliorini, M., Rota, E., & Bargagli, R. (2017). Highly diverse urban soil communities: does stochasticity play a major role?. APPLIED SOIL ECOLOGY, 110, 73-78 [10.1016/j.apsoil.2016.10.012].

Highly diverse urban soil communities: does stochasticity play a major role?

Migliorini, Massimo;Rota, Emilia;Bargagli, Roberto
2017

Abstract

Urban soil biota can be surprisingly diverse and recent studies hypothesize that such biodiversity is partly due to stochastic community dynamics caused by fragmentation and high environmental variability. We aimed to quantify the relative effects of these factors on the community structure of soil oribatid mites inhabiting holm oak woodlands in two Mediterranean cities. We partitioned the community variation into fractions uniquely attributable to gradients in soil abiotic properties, pollution, microbiological properties, and spatial and temporal variation that could not be related to measured soil factors. As we found strong spatial structure at the local scales, a neutral model was fitted to test whether beta diversity patterns of relatively isolated communities were consistent with a purely stochastic assembly process. The overall diversity of the assemblage was remarkable: a total of 124 species were identified and rarefaction curves demonstrated that urban parks are as rich in species as their counterpart woodlands in suburban areas. The fraction of variation explainable in terms of soil properties, microbiology and pollution was statistically significant but surprisingly low. At the site scale, patterns of beta diversity (i.e. spatial turnover in species composition and relative abundances) were not significantly different from those predicted by neutral models. Stochastic models can parsimoniously predict background levels of urban soil biodiversity at local scales, while disturbance and environmental variation still play some significant but not major role at broader scales.
Caruso, T., Migliorini, M., Rota, E., & Bargagli, R. (2017). Highly diverse urban soil communities: does stochasticity play a major role?. APPLIED SOIL ECOLOGY, 110, 73-78 [10.1016/j.apsoil.2016.10.012].
File in questo prodotto:
File Dimensione Formato  
ApplSoilEcol 2017.pdf

non disponibili

Tipologia: PDF editoriale
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 454.33 kB
Formato Adobe PDF
454.33 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Highly diverse urban soil communities postprint.pdf

accesso aperto

Descrizione: https://doi.org/10.1016/j.apsoil.2016.10.012
Tipologia: Post-print
Licenza: Creative commons
Dimensione 174.2 kB
Formato Adobe PDF
174.2 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/1212475