Ecological connectivity is changing rapidly due to habitat fragmentation and climate warming,
threatening the survival of species in heterogeneous landscapes. Though the functional connectivity
of single species has been thoroughly studied, little is known about the interactions between
fragmentation and warming in multispecies connectivity networks. This paper compares multispecies
functional connectivity in fragmented, warming landscapes across 18 vertebrate taxa of interest as
focal species. The distribution models of species were combined with the surfaces of resistance based
on the land-cover fragmentation index and temperature anomalies 1985-2020. Graph-theoretic metrics
and circuit-based modeling were used to quantify connectivity patterns for constructing multispecies
functional connectivity networks. The findings show that connectivity is significantly degraded in
both stressing conditions individually and in combination. Fragmentation of land, by itself, caused a
27.6% reduction in mean connectivity, whereas warming trends led to a 19.3% decrease in
connectivity relative to the baseline. Connectivity loss was experienced to 38.9% when the interacting
factors were fragmentation and warming, showing a cumulative effect. Modularity of the network
increased from 0.41 to 0.63, indicating greater isolation between habitat clusters. Pathways that
supported over 60% of the modeled species declined by 34%, and low-elevation and edge-dominated
pathways experienced the greatest losses. Moreover, the probability of dispersal for species with a
narrow thermal range decreased by 42% compared with generalist species, suggesting increased
susceptibility to resistance under warming. These results indicate that multispecies functional
connectivity networks are more vulnerable to the synergistic effects of habitat fragmentation and
climate warming than to either pressure alone. The conservation policies, which place greater
emphasis on climate-resilient corridors and ensure multi-species connectivity, can thus be vital in
supporting the functionality of ecological networks in the face of current global change.