Understanding complex spatial dynamics from mechanistic models through spatio‐temporal point processes - Archive ouverte HAL Access content directly
Journal Articles Ecography Year : 2022

Understanding complex spatial dynamics from mechanistic models through spatio‐temporal point processes

(1) , (1) , (1) , (1)
1

Abstract

Landscape heterogeneity affects population dynamics, which determine species persistence, diversity and interactions. These relationships can be accurately represented by advanced spatially-explicit models (SEMs) allowing for high levels of detail and precision. However, such approaches are characterised by high computational complexity, high amount of data and memory requirements and spatio-temporal outputs may be difficult to analyse. A possibility to deal with this complexity is to aggregate outputs over time or space, but then interesting information may be masked and lost, such as local spatio-temporal relationships or patterns. An alternative solution is given by meta-models and meta-analysis, where simplified mathematical relationships are used to structure and summarise the complex transformations from inputs to outputs. Here, we propose an original approach to analyse SEM outputs. By developing a meta-modelling approach based on spatio-temporal point processes (STPPs), we characterise spatio-temporal population dynamics and landscape heterogeneity relationships in agricultural contexts. A landscape generator and a spatially-explicit population model simulate hierarchically the pest-predator dynamics of codling moth and ground beetles in apple orchards over heterogeneous agricultural landscapes. Spatio-temporally explicit outputs are simplified to marked point patterns of key events, such as local proliferation or introduction events. Then, we construct and estimate regression equations for multi-type STPPs composed of event occurrence intensity and magnitudes. Results provide local insights into spatio-temporal dynamics of pest-predator systems. We are able to differentiate the contributions of different driver categories (i.e. spatio-temporal, spatial, population dynamics). We highlight changes in the effects on occurrence intensity and magnitude when considering drivers at global or local scale. This approach leads to novel findings in agroecology where, for example, we show that the organisation of cultivated patches and semi-natural elements play different roles for pest regulation depending on the scale considered. It aids to formulate guidelines for biological control strategies at global and local scale.
Fichier principal
Vignette du fichier
Zamberletti_ecography_2021.pdf (2.62 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03775577 , version 1 (12-09-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Patrizia Zamberletti, Julien Papaïx, Edith Gabriel, Thomas Opitz. Understanding complex spatial dynamics from mechanistic models through spatio‐temporal point processes. Ecography, 2022, 2022 (5), ⟨10.1111/ecog.05956⟩. ⟨hal-03775577⟩

Collections

INRAE MATHNUM
32 View
5 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More