Ilaria Bernabò

The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models and analyses were derived from an integrated modeling and post‐modeling GIS workflow and used to identify and propose conservation priority areas, also quantifying the proportion of these areas covered by existing protected areas (PAs). We applied the approach, as an example, to the genus Salamandrina , the oldest Salamandridae clade, because of its conservation and biogeographic importance. Our approach can be applied to any taxon. Specifically, we introduced and identified the steady core regions (i.e., areas predicted to remain ecologically suitable for the next 50 years) for Salamandrina . The geographic configuration of these areas, including their clustering and fragmentation degree, differed between distance‐informed and distance‐uninformed approaches along the Apennine chain. Those occurred in nationally designated PAs (few, large patches) and Natura 2000 sites (many and small patches), but steadiness values were generally low (often <5 out of 13), indicating scarce legal protection of temporally stable areas. We therefore propose 2 strategies to delineate areas currently unprotected that should be prioritized to reach the 30% of territories protected by 2030: increasing existing PA boundaries by estimating buffer distances and inferring stable areas outside current PAs, which we term half‐century stable proposed protected areas (HCSPPAs). The buffering approach indicated a required 1‐km expansion. The HCSPPAs clustered near existing PAs in northern and central Italy. In southern Italy, they were fewer and more dispersed, ranging from close to distant locations relative to current PAs. Our approach aligns with the European Union's 2030 Biodiversity Strategy and the global 30×30 conservation target because it provides a flexible and spatially informed framework to prioritize biodiversity conservation and strengthen long‐term species’ protection.

Background: Amphibians are the most globally threatened vertebrates, facing a particularly high risk of extinction in some regions, such as the Mediterranean basin. Within this region, the genus Salamandrina, comprising two species of notable conservation concerns, managed to persist throughout historical climate changes exclusively along the Italian peninsula. Among the main threats to this genus are habitat loss and climate change, as this salamander is adapted to humid forests and relies heavily on water sources, such as small streams, for reproduction. In this study, we employed fine-scale species distribution models (SDMs) to estimate areas projected to remain suitable for Salamandrina species in the future and areas expected to become unsuitable, incorporating bioclimatic, topographic, and habitat variables. We also evaluated landscape connectivity and identified ecological corridors that could facilitate movement through circuit-theory techniques, analyzing potential changes under different scenarios. Additionally, considering known hybridization events in a contact zone between the two species, we measured connectivity to assess whether this process might change in the future. Results: We found several suitable areas that mostly align with the known ranges of both species. Future projections showed an overall decline in habitat suitability, with a northwestern shift. While strong in certain areas, landscape connectivity is expected to decrease overall. Specifically, our results revealed several corridors for S. perspicillata (the northern species), with higher connectivity values in the Central Apennines. For S. terdigitata (the southern species), a crucial corridor in the Catena Costiera Massifs, in the western southernmost region of the Italian peninsula, connects two key conservation areas. In the contact zone, we identified corridors that could favor hybridization between the species, with predictions suggesting an increase. Conclusions: Our findings inform the long-term conservation of a unique salamander genus. Strengthening conservation measures on Salamandrina species in areas predicted to become unsuitable or in areas that could become suitable and serve as ecological corridors will be critical. Furthermore, future monitoring efforts should focus on the corridors identified in the contact zone to assess whether the hybridization process is ongoing and at what rate.

Amphibians are among the most threatened vertebrates globally, and their conservation status continues to decline. In the updated Global Amphibian Assessment (GAA2), the use of IUCN Criterion E, which projects extinction risks through quantitative models, highlighted southern Europe as a hotspot for salamander extinction risk due to the risk of invasion by the fungal pathogen Batrachochytrium salamandrivorans (Bsal). In particular, for five Italian salamander species, risk categories were elevated significantly based on Criterion E, from Vulnerable or lower to Endangered or Critically Endangered. This increased reliance on Criterion E raises concerns regarding its treatment of uncertainty, as these projections depend heavily on assumptions about Bsal spread, environmental suitability, and host dynamics. Limited exploration of alternative scenarios and reliance on extreme parameter values may result in inflated extinction risk estimates. We emphasize the need for improved documentation of uncertainty and integration of diverse expert opinions in extinction risk assessments, to balance proactive conservation planning with robust scientific methodology.

The fungi Batrachochytrium dendrobatidis (Bd) and B. salamandrivorans (Bsal) and their associated disease, i.e., chytridiomycosis, pose significant threats to amphibians occurring in the Western Palearctic. This study aims to assess the prevalence and infection load of Bd and Bsal in the Calabrian Alpine newt, Ichthyosaura alpestris inexpectata, a micro-endemic and endangered subspecies from the Catena Costiera, Calabria, Southern Italy. Ninety newts were sampled from May to October 2023 from five breeding sites, representing the core distribution area of the Calabrian Alpine newt. Molecular analyses revealed that over 50% of the samples tested positive for Bd, while none tested positive for Bsal. No gross external signs of disease were detected in tested individuals. Bd prevalence and load were balanced between sexes but varied significantly among sites and were negatively associated with newt size, likely indicating site-specific and age variations in infection. Although Bsal was not detected, the high prevalence of Bd presents a new conservation challenge for the cold-loving Calabrian Alpine newt, which is already threatened by climate change and the introduction of alien fish in its main breeding sites. Therefore, it is crucial that future conservation actions, including monitoring for potential outbreaks of chytridiomycosis, are implemented adopting rigorous biosecurity measures to prevent further spread of the pathogen and safeguard the entire amphibian community.

To improve monitoring techniques, we investigated the colour vision of the Calabrian Alpine newt (Ichthyosaura alpestris inexpectata). We conducted controlled behavioural experiments on male and female newts to explore their response to artificial coloured light sources in the dark. We used green, blue, and orange glow sticks. Observations indicated that both sexes strongly preferred green glow sticks, which were selected in almost 50% of the trials Additionally, newts exhibited markedly swifter reactions to green light. The attraction to green glow sticks may be due to the biofluorescence within the green wavelength spectrum in this newt. This glowing ability, which resembles the green glow stick’s glow, could be beneficial in low-light conditions to locate other newts. Our results show that the behavioural preferences towards a particular light source can significantly enhance the success of capturing newts during population monitoring and conservation efforts for this rare and threatened taxon.

Species introductions outside their native ranges, often driven by trade and other anthropogenic activities, present significant ecological challenges. Reptiles, frequently traded as pets for their attractiveness, are particularly susceptible to such introductions, leading to shifts in distribution patterns and potential ecological impacts. The common chameleon (Chamaeleo chamaeleon), which has been historically introduced in several European countries, is such an example, yet no overall assessments are available to date for this species. In this study, we used ecological niche models to assess habitat suitability for the common chameleon in the Mediterranean basin for current and future scenarios. Concurrently, circuit theory techniques were employed to evaluate habitat connectivity in two historically introduced areas. We identified areas of high habitat suitability and dispersal corridors in introduced regions. Our results reveal a latitudinal gradient in habitat suitability changes, with the species facing both expansion and decline in different parts of its range, depending on the ecozone considered. Severe declines are noted in southeastern Spain, Tunisia, and Israel, while habitat suitability increases westwards in Portugal, Morocco, and Southern Italy. These insights contribute to a better understanding of the common chameleon’s ecological dynamics, providing a foundation for targeted management and conservation efforts. Our study highlights the importance of integrating ecological niche modelling and circuit theory techniques to predict habitat suitability and identify critical dispersal corridors for effective conservation strategies. Considering the ongoing challenges posed by human-mediated dispersals for the common chameleon, our research establishes a foundation for future studies to enhance our understanding of this elusive species.