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Environmental suitability of new reported localities of the funnelweb spider Macrothele calpeiana: an assessment using potential distribution modelling with presence-only techniques

(2011) JOURNAL OF BIOGEOGRAPHY. 38(6). p.1213-1223
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Abstract
Aim : The funnelweb spider Macrothele calpeiana is endemic to the southern half of the Iberian Peninsula, but recent occurrence records from localities in Spain, North Africa and other regions of Europe, which are distant from its native populations, suggest human-mediated dispersal, probably associated with the commercial export of olive trees. The main goal of this study was to assess the environmental suitability of these new records and to discuss the spider's potential to become an invasive species, mainly in new regions across Central Europe and the Mediterranean Basin. Location : Central Europe, Mediterranean Basin. Methods : Using presence points from the Iberian native populations of M. calpeiana and a set of climatic variables, four presence-only algorithms (BIOCLIM, DOMAIN, GARP and Maxent) were applied to model the potential distribution of the spider. The models were transferred to Central Europe and the Mediterranean Basin, and the locations of the new records in both the occupied and potential environmental spaces were screened. Results : The four models were generally congruent in predicting the existence of a suitable climate for the species across the Mediterranean Basin, although BIOCLIM and DOMAIN yielded more constrained predictions than GARP and Maxent. Whereas the new records from Central Europe were located far from the occupied and potential climatic spaces, those from the Iberian Peninsula were not. Main conclusions : Climatic suitability together with propagule pressure owing to human activities will certainly enhance the opportunities for M. calpeiana to colonize new areas across the Mediterranean Basin. The species has invaded areas beyond its native range, and those new locations located in the Iberian Peninsula and North Africa show environmental suitability for the spider and deserve long-term monitoring. Although the new locations in Central Europe were not predicted by the climate models and the persistence of the species seems improbable, the possibility of rapid evolution or phenotypic plasticity processes raises the need for caution over the possibility of a future spread of M. calpeiana across Europe. Stronger controls over the transport of trees must be applied, and further studies on the ecology of the spider are imperative to assess the possible impact on the invaded ecosystems.
Keywords
NICHE, Macrothele calpeiana, UNCERTAINTIES, INVASIONS, spiders, SPECIES DISTRIBUTIONS, CLIMATE-CHANGE, RANGE SHIFTS, ARANEAE, HEXATHELIDAE, species distribution modelling, invasive species, Mediterranean Basin, population expansion, PREDICTION, ABSENCES, environmental suitability, Iberian Peninsula, Araneae, Central Europe

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Citation

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Chicago
Jiménez-Valverde, Alberto, Arthur Decae, and Miquel A Arnedo. 2011. “Environmental Suitability of New Reported Localities of the Funnelweb Spider Macrothele Calpeiana: An Assessment Using Potential Distribution Modelling with Presence-only Techniques.” Journal of Biogeography 38 (6): 1213–1223.
APA
Jiménez-Valverde, A., Decae, A., & Arnedo, M. A. (2011). Environmental suitability of new reported localities of the funnelweb spider Macrothele calpeiana: an assessment using potential distribution modelling with presence-only techniques. JOURNAL OF BIOGEOGRAPHY, 38(6), 1213–1223.
Vancouver
1.
Jiménez-Valverde A, Decae A, Arnedo MA. Environmental suitability of new reported localities of the funnelweb spider Macrothele calpeiana: an assessment using potential distribution modelling with presence-only techniques. JOURNAL OF BIOGEOGRAPHY. 2011;38(6):1213–23.
MLA
Jiménez-Valverde, Alberto, Arthur Decae, and Miquel A Arnedo. “Environmental Suitability of New Reported Localities of the Funnelweb Spider Macrothele Calpeiana: An Assessment Using Potential Distribution Modelling with Presence-only Techniques.” JOURNAL OF BIOGEOGRAPHY 38.6 (2011): 1213–1223. Print.
@article{1163324,
  abstract     = {Aim : The funnelweb spider Macrothele calpeiana is endemic to the southern half of the Iberian Peninsula, but recent occurrence records from localities in Spain, North Africa and other regions of Europe, which are distant from its native populations, suggest human-mediated dispersal, probably associated with the commercial export of olive trees. The main goal of this study was to assess the environmental suitability of these new records and to discuss the spider's potential to become an invasive species, mainly in new regions across Central Europe and the Mediterranean Basin. 
Location : Central Europe, Mediterranean Basin. 
Methods : Using presence points from the Iberian native populations of M. calpeiana and a set of climatic variables, four presence-only algorithms (BIOCLIM, DOMAIN, GARP and Maxent) were applied to model the potential distribution of the spider. The models were transferred to Central Europe and the Mediterranean Basin, and the locations of the new records in both the occupied and potential environmental spaces were screened. 
Results : The four models were generally congruent in predicting the existence of a suitable climate for the species across the Mediterranean Basin, although BIOCLIM and DOMAIN yielded more constrained predictions than GARP and Maxent. Whereas the new records from Central Europe were located far from the occupied and potential climatic spaces, those from the Iberian Peninsula were not. 
Main conclusions : Climatic suitability together with propagule pressure owing to human activities will certainly enhance the opportunities for M. calpeiana to colonize new areas across the Mediterranean Basin. The species has invaded areas beyond its native range, and those new locations located in the Iberian Peninsula and North Africa show environmental suitability for the spider and deserve long-term monitoring. Although the new locations in Central Europe were not predicted by the climate models and the persistence of the species seems improbable, the possibility of rapid evolution or phenotypic plasticity processes raises the need for caution over the possibility of a future spread of M. calpeiana across Europe. Stronger controls over the transport of trees must be applied, and further studies on the ecology of the spider are imperative to assess the possible impact on the invaded ecosystems.},
  author       = {Jim{\'e}nez-Valverde, Alberto and Decae, Arthur and Arnedo, Miquel A},
  issn         = {0305-0270},
  journal      = {JOURNAL OF BIOGEOGRAPHY},
  keyword      = {NICHE,Macrothele calpeiana,UNCERTAINTIES,INVASIONS,spiders,SPECIES DISTRIBUTIONS,CLIMATE-CHANGE,RANGE SHIFTS,ARANEAE,HEXATHELIDAE,species distribution modelling,invasive species,Mediterranean Basin,population expansion,PREDICTION,ABSENCES,environmental suitability,Iberian Peninsula,Araneae,Central Europe},
  language     = {eng},
  number       = {6},
  pages        = {1213--1223},
  title        = {Environmental suitability of new reported localities of the funnelweb spider Macrothele calpeiana: an assessment using potential distribution modelling with presence-only techniques},
  url          = {http://dx.doi.org/10.1111/j.1365-2699.2010.02465.x},
  volume       = {38},
  year         = {2011},
}

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