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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.

The Eurasian beaver is a keystone species and landscape-capable ecosystem engineer, which went close to extinction until the 19th century. Recently, thanks to legal protection and reintroduction programs, the species has recolonized much of its past range. However, in some countries this process did not occur. Objectives. Our objective is to model the potential distribution of the Eurasian beaver for current and future conditions, on a continental scale, at river and sub-basin level. We focus on the protected areas of Italy and Portugal for possible reintroductions. Methods. The study area is Europe, with a subset focusing on Italy and Portugal. We produce species distribution models for current and future conditions using climate change scenarios and predicting changes in river flow, including topographic and human disturbance variables. We then deepen suitability-related issues within Italian and Portuguese protected areas. Results. We find that the Eurasian beaver current suitability is comparable to its known distribution, although some potentially-suitable spots occur in Italy (where there are two occurrences), while the Iberian Peninsula and the Balkan countries host scattered suitable spots. Future scenarios predict a general lowering of suitability in Central and Northern Europe. Portuguese protected areas generally host unsuitable territories, while the Italian ones have reported a tangled scenario, depending on the biogeographical sector. Conclusions. Our results may support the large-scale management of the beaver, both for countries already hosting this species and those planning a reintroduction. The framework used may be applied to other species, and for different topics, from biogeography to conservation.

Aim Reintroducing carnivores is a widely used approach to restore the natural integrity of ecosystems. Species distribution models (SDMs) and connectivity analyses are valuable tools for planning reintroductions and identifying release sites but are rarely combined. We propose a new framework combining SDMs, connectivity modelling and individual‐based models (IBMs) to assess the feasibility of various reintroduction scenarios. As a case study, we applied this framework to plan a potential reintroduction of the Eurasian lynx (Lynx lynx) to the Apennines by: (i) assessing niche overlap between potential source and target populations; (ii) integrating habitat suitability and connectivity to select release sites and (iii) evaluating reintroduction outcomes through IBMs. Location Apennines, Peninsular Italy. Methods We combined niche overlap analysis, ensembles of fine‐tuned SDMs and circuit‐theory techniques to model connectivity. Then, we integrated suitability and connectivity predictions within a GIS environment to identify the optimal release sites under different scenarios. Finally, we used IBMs to assess population viability, site occupancy and dispersal. Results Niche overlap suggested that the Carpathian lynx populations may serve as a valid reintroduction source. Integrating habitat and connectivity models highlighted the most functional sites in the Central (CA) and Northern Apennines (NA). A scenario with individuals released in both CA and NA did not outperform the single‐area scenarios. Releasing individuals only in CA showed long‐term feasibility but a higher risk of isolation, while release only in NA would not result in viable populations in the long term, despite closer proximity to suitable areas in the Alps. Main Conclusions Our framework can help practitioners with integrating functional connectivity within the selection of release sites for species reintroductions. We recommend incorporating demography, as well as dispersal and settlement phases, when evaluating reintroduction scenarios. This approach identifies critical mortality areas, predicts population size, site occupancy and connectivity and enhances decision‐making for successful reintroductions.

Context After being close to extinction, the Eurasian beaver ( Castor fiber ) is now recovering throughout Europe. The Eurasian beaver is a keystone species, and an ecosystem engineer, capable of modifying ecosystems at multiple levels. In the last years, the species reappeared in Italy due to natural recolonization and illegal reintroductions, while in Spain, after being confined to the Ebro basin, the beaver has been recently reported at the border with Portugal. Objectives In this study, we evaluated both functional and structural connectivity for the Eurasian beaver in Italy and in the Iberian Peninsulas, to deepen the understanding of its expansion process, and to prioritize the barriers that occur in the areas where the species is reported, and that could limit this expansion. Methods We generated resistance layers for each study area, based on key variables for the target species. Circuit theory was applied to evaluate functional connectivity, summarizing it at the basin and protected areas (PAs) level. We applied different fluvial connectivity indices to characterize, at-reach-scale, structural connectivity, and identify barriers within each hydrographic network. Results In both study areas, there are several corridors mainly linked to rivers with high tree cover that occur in flat areas, like the valleys in the Apennines and the Cantabrian mountain systems. Despite the distances and the extant barriers, the occurrences in Central Italy and Spain are respectively well-connected. In general, in each hydrographic network, only a few barriers impede connectivity, with the Iberian Peninsula more impacted, especially in the Douro basin. In the Ebro basin, several barriers contribute to fragmentation, especially in the northern area considering the Population Connectivity Indices; however, high connectivity is found within the protected areas. Conclusions The recent return of the Eurasian beaver in Italy, and its recent expansion in the Iberian Peninsula, could continue in the near future, considering both the fair habitat connectivity and the adaptability of the species. Although both areas are impacted by man-made dams, only a specific set possibly limits the Eurasian beavers’ expansion. In general, the current PAs arrangement does not protect the areas important for the beaver connectivity, with some of them impacted by man-made dams.

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.

Obesity is a major health issue in dogs associated with disturbances in lipid metabolism and oxidative stress. Spirulina has been shown to have hypolipidemic and antioxidant effects in various animal species. No such data regarding dogs are available, however. The present study aimed to investigate the effect of a therapeutic high-protein, high-fiber weight loss diet, with or without Spirulina supplementation, on biochemical parameters of overweight dogs, with particular reference to serum lipids and plasma antioxidant capacity. Thirty-two dogs completed a double-blind randomized placebo-controlled trial in which they received either Spirulina (S) or placebo (P) tablets in a body weight-dependent amount for 12 weeks; at the same time, both groups were fed the same calorie-restricted diet. Dogs were weighed weekly and calorie restriction was adjusted accordingly to ensure a 1% body weight loss per week. Blood samples were collected at baseline (T0), after 6 weeks (T1), and after 12 weeks (T2). No difference in body weight loss (S: -11.9 ± 0.8%, P: -10.6 ± 0.8%, p = 0.229) was detected between groups at T2. After 6 weeks and an average weight loss of around 6% (S: -6.7 ± 0.6%, P: -5.9 ± 0.6, p = 0.276), significant reductions of serum total cholesterol, glucose, alkaline phosphatase, paraxonase-1 (all p < 0.0001) and gamma-glutamyltransferase (p < 0.018) were observed in both groups, regardless of supplementation. Plasma antioxidant capacity increased significantly in both groups at T2 (p = 0.0003). Serum triglycerides decreased significantly from T0 to T1 in the Spirulina group (p < 0.0001) but not in the placebo group (p = 0.28); as for the difference between groups, a non-significant trend (p = 0.098) was detected. A significantly higher percentage of dogs (p = 0.028) in the Spirulina group achieved a serum triglycerides reduction > 15% compared to baseline at T1 and > 30% at T2. A treatment effect (p = 0.0416) was found for bilirubin, which decreased only in the Spirulina group. In conclusion, a weight loss of around 6% achieved with a high-protein, high-fiber hypocaloric diet is sufficient to induce significant positive metabolic effects and improve lipid, glucose, and liver enzyme values. Plasma antioxidant capacity was tested in dogs undergoing a weight loss program for the first time, demonstrating that overweight individuals are in a deficient status and that a weight loss of around 10% is able to restore values comparable to those of healthy individuals. The results of this study suggest that Spirulina may manifest a hypotriglyceridemic effect in dogs, even if further research is needed to infer causation. The role Spirulina that supplementation plays in bilirubin metabolism and its related beneficial effect is also worth exploring.

This study performed a yield gap analysis to help farmers understand whether their constraints were mainly due to nutritional factors or management and health issues. Twenty-nine farms were periodically evaluated. Milk yield (MY), dry matter intake (DMI), total mixed ration (TMR) composition and homogeneity index (HI), TMR digestibility, income over feed cost (IOFC), and MY summer–winter ratio (SWR) were collected. Farms were divided and compared according to the average annual MY: Low (L), Medium (M) and High (H), characterised by <31.1, 31.1–36.7 and >36.7 kg/head/day. An ANOVA mixed model and a stepwise regression to assess the relationship between nutritional variables and MY were run. H farms showed higher IOFC (p < 0.001), DMI (p = 0.006), DDM (p < 0.001), digestible crude protein (DCP, p = 0.019), HI (p = 0.09), SWR (p = 0.041) and lower HI coefficient of variation (p = 0.04). The conversion of DDM into milk was higher in H and M farms. Stepwise regression for MY selected DDM and CP (R2 = 0.716, p < 0.05). M farms were mainly constrained by nutritional factors, whereas L farms were also affected by other factors such as those related to management and health.

Several studies investigated the possible impacts of the restriction measures related to the containment of the spread of the COrona VIrus Disease (COVID-19) to atmospheric ozone (O 3 ) at global, regional, and local scales during 2020. O 3 is a secondary pollutant with adverse effects on population health and ecosystems and with negative impacts on climate, acting as greenhouse gas. Most of these studies focused on spring 2020 (i.e. March–May) and on observations in the planetary boundary layer (PBL), mostly in the vicinity of urban agglomerates. Here, we analyzed the variability of O 3 above the PBL of northern Italy in 2020 by using continuous observations carried out at a high mountain WMO/GAW global station in Italy (Mt. Cimone–CMN; 44°12′ N, 10°42′ E, 2165 m a.s.l.). Low O 3 monthly anomalies were observed during spring (MAM) and summer (JJA), when periods of low O 3 intertwined with periods with higher O 3 , within climatological ranges. A similar variability was observed for O 3 precursors like NO 2 and 15 anthropogenic non-methane volatile organic carbons, but the systematic O 3 anomalies were not reflected in these variables. The analysis of meteorological variables and diel O 3 cycles did not suggest major changes in the vertical transport related to the thermal circulation system in the mountain area. The analysis of five days back-trajectories suggested that the observed O 3 anomalies cannot be explained by differences in the synoptic-scale circulation with respect to the previous years alone. On the other hand, the characterization of two transport patterns (i.e. air masses from the regional PBL or from the free troposphere) and the analysis of back-trajectories suggested an important contribution of transport from the continental PBL during the periods with the lowest O 3 at CMN. When proxies of air mass transport from the regional PBL are considered, a lower NO x content was pointed out with respect to the previous years, suggesting a lower O 3 production in a NO x -limited atmosphere. Our study suggested for the first time that, during MAM and JJA 2020, the reduced anthropogenic emissions related to the COVID-19 restrictions lowered the amount of this short-lived climate forcer/pollutant at remote locations above the PBL over northern Italy. This work suggests the importance of limiting anthropogenic precursor emissions for decreasing the O 3 amount at remote locations and in upper atmospheric layers.

If climate services are to lead to effective use of climate information in decision-making to enable the transition to a climate-smart, climate-ready world, then the question of trust in the products and services is of paramount importance. The Copernicus Climate Change Service (C3S) has been actively grappling with how to build such trust: provision of demonstrably independent assessments of the quality of products, which was deemed an important element in such trust-building processes. C3S provides access to essential climate variables (ECVs) from multiple sources to a broad set of users ranging from scientists to private companies and decision-makers. Here we outline the approach undertaken to coherently assess the quality of a suite of observation- and reanalysis-based ECV products covering the atmosphere, ocean, land, and cryosphere. The assessment is based on four pillars: basic data checks, maturity of the datasets, fitness for purpose (scientific use cases and climate studies), and guidance to users. It is undertaken independently by scientific experts and presented alongside the datasets in a fully traceable, replicable, and transparent manner. The methodology deployed is detailed, and example assessments are given. These independent scientific quality assessments are intended to guide users to ensure they use tools and datasets that are fit for purpose to answer their specific needs rather than simply use the first product they alight on. This is the first such effort to develop and apply an assessment framework consistently to all ECVs. Lessons learned and future perspectives are outlined to potentially improve future assessment activities and thus climate services.

We investigate front propagation in systems with diffusive and sub-diffusive behavior. The scaling behavior of moments of the diffusive problem, both in the standard and in the anomalous cases, is not enough to determine the features of the reactive front. In fact, the shape of the bulk of the probability distribution of the transport process, which determines the diffusive properties, is important just for pre-asymptotic behavior of front propagation, while the precise shape of the tails of the probability distribution determines asymptotic behavior of front propagation.