Figure 1.
Presence records for Rhinolophus euryale (n = 65; black symbols) and R. mehelyi (n = 40; grey symbols) considered for this study.
The publicly available map layer was obtained from www.fao.org/geonetwork/srv/en/main.home and the image prepared with the Quantum Gis 2.2.0 Valmiera open source software.
Table 1.
Validation methods applied to Maxent Species Distribution Models for Rhinolophus euryale and R. mehelyi.
Figure 2.
Distribution and colony size on Sardinia for Rhinolophus euryale (left) and R. mehelyi (right).
Circle sizes are proportional to colony sizes. Black: nursery colonies; white: hibernacula; grey: other day-roost. Mixed-colour (white + black) symbols correspond to sites used by bats year round for both hibernation and reproduction. The publicly available map layer was obtained from www.fao.org/geonetwork/srv/en/main.home and the image prepared with the Quantum Gis 2.2.0 Valmiera open source software.
Figure 3.
Maxent Species Distribution Models (SDM).
a: SDM for R. euryale on Sardinia calibrated with Sardinian records only; b: SDM for Rhinolophus euryale on Sardinia calibrated with presence records from Italian populations except that of Sardinia and projected to the island; c: SDM for R. mehelyi on Sardinia calibrated with Sardinian records only; c: binary map for R. euryale on Sardinia calibrated with Sardinian records only; d: binary map for Rhinolophus euryale on Sardinia calibrated with presence records from Italian populations except that of Sardinia and projected to the island; e: binary map for R. mehelyi on Sardinia calibrated with Sardinian records only The publicly available map layer was obtained from www.fao.org/geonetwork/srv/en/main.home and the image prepared with the Quantum Gis 2.2.0 Valmiera and Maxent open source software packages.
Table 2.
Schoener’s D and Niche similarity significance levels relative to ordination methods and Species Distribution Models used to carry out niche comparison.
Figure 4.
Graphical representation of the environmental niches for Rhinolophus euryale.
a: Sardinian population; b: other Italian populations. In the example, niche were generated with Principal Component Analysis calibrated on the whole environmental space including the presence records where the species occur.
Figure 5.
Maxent SDMs for Rhinolophus euryale calibrated respectively on presence records of bats from Sardinia (left) and from the remaining Italian areas (right) and projected to northern Africa.
LGM = Last Glacial Maximum. CCSM = Community Climate System Model; MIROC = Model for Interdisciplinary Research on Climate. The publicly available map layer was obtained from www.fao.org/geonetwork/srv/en/main.home and the image prepared with the Quantum Gis 2.2.0 Valmiera and Maxent open source software packages.