A spatiotemporal multispecies model of a semicontinuous response
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As accessible and potentially vulnerable species high up in the food chain, birds are often used as indicator species to highlight changes in ecosystems. This study focuses on multiple spatially dependent relationships between a raptor (sparrowhawk), a potential prey species (house sparrow) and a sympatric species (collared doves) in space and time. We construct a complex spatiotemporal latent Gaussian model to incorporate both predator–prey and sympatric relationships, which is novel in two ways. First, different types of species interactions are represented by a shared spatiotemporal random effect, which extends existing approaches to multivariate spatial modelling through the use of a joint latent modelling approach. Second, we use a delta–gamma model to capture the semicontinuous nature of the data to model the binary and continuous sections of the response jointly. The results indicate that sparrowhawks have a localized effect on the presence of house sparrows, which could indicate that house sparrows avoid sites where sparrowhawks are present.
Jones-Todd , C M , Swallow , B , Illian , J B & Toms , M 2018 , ' A spatiotemporal multispecies model of a semicontinuous response ' , Journal of the Royal Statistical Society: Series C (Applied Statistics) , vol. 67 , no. 3 , pp. 705-722 . https://doi.org/10.1111/rssc.12250
Journal of the Royal Statistical Society: Series C (Applied Statistics)
Copyright © 2017, Royal Statistical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1111/rssc.12250
DescriptionBS was part funded by Engineering and Physical Sciences Research Council–Natural Environment Research Council grant EP/10009171/1.
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