Table 1.
Summary of occurrence data available for Sphodros niger and Latrodectus variolus distribution models, including the sources of data, their period of collection, and sample sizes.
Other sources include private collections, personal observations, and news articles.
Fig 1.
Suitable climatic habitat of Latrodectus variolus predicted from 1990–2016 observation records.
Observation records are shown for both 1960–1989 and 1990–2016.
Fig 2.
Suitable climatic habitat of Sphodros niger predicted from 1960–1989 and 1990–2015 observation records.
Observation records are shown for both 1960–1989 and 1990–2015.
Table 2.
Predictive performance of Latrodectus variolus and Sphodros niger distribution models assessed through the receiver operating characteristic curve (AUC), correlation coefficients (COR), and true skill statistics (TSS).
Values are the average (± SD) of 100 iterated models.
Table 3.
The importance of the six bioclimatic predictors used in habitat range models of Latrodectus variolus and Sphodros niger.