Reptile Diversity Research Articles

Survey of Reptiles in Nechisar National Park, Southern Ethiopia

Species diversity, composition, relative abundance and evenness of the reptilian communities in Nechisar National Park were studied. The survey was conducted using pitfall traps, active search and cover sheet methods. The study identified 34 reptile species belonging to 3 orders (Squamata, Testudines, and Crocodylia). Squamata was the most diverse containing 30 species belonging to 2 suborders: Sauria which consists of 19 species from 7 families and 10 genera; and Serpentes which consists of 11 species from 5 families and 10 genera. Testudines included 3 species from 2 families and 3 genera. Crocodylia was represented by a single species. Reptile diversity varied among the different habitat types, with the bushland habitat having the highest number of species representing 29.69% of the total species recorded.

Taxonomic diversity of terrestrial vertebrates in west-central Mexico: Conservation from a multi-taxa perspective.

Multi-taxa approaches are increasingly used because they describe complementary aspects of ecosystem dynamics from a community ecology perspective. In west-central Mexico, the complex biogeography and topography have created an environment where temperate and tropical forests converge, resulting in great biological diversity. Within this region, the Sierra de Quila Natural Protected Area (SQPA) offers an important example for understanding ecological community dynamics. We analyze the taxonomic diversity of terrestrial vertebrates in the SQPA by incorporating taxonomic levels associated with species. We evaluated the taxonomic diversity with i) an average taxonomic distinctiveness analysis (alpha diversity) and ii) an analysis of taxonomic dissimilarity and partitioning of turnover and differences in richness components (beta diversity). Tropical forests boast the highest taxonomic diversity of amphibians, reptiles, and birds, while temperate gallery forests exhibit lower values. Our results showed that terrestrial vertebrate alpha and beta diversity patterns respond mainly to contrasting vegetation types (tropical vs. temperate). Regarding beta diversity, the multi-vegetation type analysis showed the highest values for reptiles, followed by amphibians, birds, and mammals. Turnover had the highest contribution to beta diversity, while differences in richness were relevant for amphibians and reptiles, which could be related to their low mobility and sensitivity to environmental conditions. Despite the local scale, the SQPA presented high beta diversity, reflecting historical ecological processes in taxonomic composition derived from contrasting environments and constraints imposed on species. Evaluating taxonomic structure from a multi-taxa perspective is essential for conservation efforts because it allows the spatial recognition of biological assemblages as a first step for local interventions.

Reptile Diversity Patterns Under Climate and Land Use Change Scenarios in a Subtropical Montane Landscape in Mexico

ABSTRACTAimMountainous regions are rich in reptile biodiversity but face threats from climate and land use changes. Understanding how these factors affect reptile diversity in these regions can highlight key conservation hotspots that require effective conservation actions. Here, we explored reptile taxonomic and functional diversity patterns along the Sierra Madre del Sur region in southeast Mexico, and potential changes in future years caused by different climate and land use change scenarios.LocationSierra Madre del Sur, México.TaxonReptiles.MethodsWe used species distribution models and information on species traits to estimate taxonomic and functional diversity throughout the Sierra Madre del Sur (SMS) region under current and future climate and land use change scenarios.ResultsGreater taxonomic and functional diversity was observed in both temperate and tropical forests. Taxonomic diversity was higher in more drier areas at high elevations while higher functional diversity was observed in wetter areas at intermediate‐to‐high elevations. Lower diversity for both dimensions was associated with anthropic land uses. In future scenarios, both dimensions of diversity are expected to increase in temperate forest in highlands of central Oaxaca and decrease in the southcentral portion of the SMS, particularly for the worst scenarios due to increased deforestation rates.Main ConclusionsHigher taxonomic diversity in more drier areas at high elevations could be due to historical and evolutionary factors, while higher functional diversity in wetter areas at intermediate‐to‐high elevations may be explained by a higher environmental heterogeneity in forests within these conditions. Larger diversity losses in the southcentral portion of the SMS are probably due to larger predicted deforestation rates in those areas. Our results are valuable not just for informing conservation actions, such as the creation of protected natural areas but also to understand the underlying processes behind the patterns of reptile diversity.

Small-scale geographic factors promote a high diversity of amphibians and reptiles in Colombia

Analysing spatial biodiversity patterns in amphibians and reptiles is key to understanding the main drivers of community ecological structure, biogeography, and guiding conservation strategies. Our goal is to map patterns of taxonomic change and unravel the geographic and environmental factors driving species turnover among the biomes found in the Sogamoso river basin (SRB), which tributes to the inter-Andean middle Magdalena valley in Colombia, a hyperdiverse region at high-risk from human activities. The study area encompasses lowland forest, submontane, montane and high-elevation Andean habitats, with distinct biomes defined by elevation and physiographic characteristics. To do this, we compared species richness among different biomes and describe their variation along the altitudinal gradient. We collected data from literature and revision of specimens deposited in herpetological collections. Species distribution models were used to estimate geographic ranges and species composition was analysed among biomes using a presence/absence matrix. Generalised Dissimilarity Modelling (GDM) was employed to explore spatial turnover patterns of species composition. We observed that species richness of both amphibians and reptiles was the highest in the tropical humid forest biome and the lowest occurred mainly in the Sub-Andean semiarid vegetation. The spatial pattern of species turnover was the same for amphibians and reptiles and revealed an extreme similarity with the previous delimitation of the five biomes, which are supported by a combination of biotic, abiotic and anthropogenic factors. This study provides valuable baseline information for the conservation of amphibians and reptiles in the SRB and highlights the importance of considering geographic and environmental factors in understanding species distribution and turnover in the region. Keywords: Sogamoso River, herpetofauna, richness patterns, turnover species, ecological structure

Reptilian Diversity in Selected Riparian Systems in Misamis Occidental, Philippines

Reptiles are one of the most ecologically important organisms in the ecosystem. Studying their diversity is important in the conservation of the habitats to where each of these reptiles live. This study aimed to explore the diversity of reptiles in the areas around and within Labo and Clarin rivers, two of the most important river systems in the province of Misamis Occidental. Three sampling techniques were applied, which are visual encounter surveys, opportunistic encounters, and road-kill encounters. The results recorded a total of 21 species, including eleven endemic species, with nine Philippine endemic and two Mindanao endemic. Most notable among the species recorded was Lycodon ferroni, which is the second documented occurrence of the species and the first outside Samar Island. Labo River has the highest species richness, abundance and percent endemism of the two riparian systems, with the upstream sites of both rivers having the highest species richness and percent endemism. Studying the nearby riparian areas using other sampling techniques is recommended to fully understand the extent of reptilian diversity in the province and to effectively implement conservation and sustainability programs for the preservation not only of the reptile diversity but as well as the riparian ecosystem.

The distribution, diversity and conservation of the Mexican herpetofauna among its biogeographic provinces

Mexico houses a substantial diversity of amphibians and reptiles, with a large number of endemics. We generated a checklist of Mexico’s herpetofauna and their distribution among its biogeographic regions and provinces. We found a total 435 species of amphibians (70.6% endemic to Mexico), and 964 species of reptiles (60.7% endemic to Mexico). The Transition Zone had the greatest herpetofaunal richness, housing 90.8% of the amphibian species and 71.1% of the reptile species that inhabit Mexico. Amphibian and reptile richness decreased from south to north, with the highest richness in the Sierra Madre del Sur, followed by the Trans-volcanic Belt and the Sierra Madre Oriental. According to the IUCN Red List, currently 28.4% of the native species of Mexican amphibians and reptiles are in a category of conservation concern. The Transition Zone, specifically the Sierra Madre del Sur, is of utmost importance due to the conservation status of its species, since this biogeographic province is home to a large number of endemic species. The Neotropical and Nearctic Regions both have around 13% of their species included in some category of conservation concern. The pairwise Jaccard distances among the biogeographic provinces for amphibians and reptiles are highly correlated suggesting parallel patterns of similarity between these two taxonomic groups. We found a positive correlation between Jaccard distances and the length of the shared border between provinces and a negative correlation between Jaccard distance and the distance between the geographic centroids of the provinces, suggesting that geographic proximity plays an important role in the similarity of herpetofauna among biogeographic provinces. The number of species in a province was not correlated with its area or longitude but showed a negative correlation with its latitude. Cluster analyses showed three main clusters of biogeographic provinces for both amphibians and reptiles, with subclusters reflecting geographic proximity and shared habitats. These results highlight the importance of considering geographic factors, such as geographic proximity and habitat similarities, in understanding the distribution and conservation of amphibians and reptiles in Mexico.

Taxonomic diversity of amphibians (Amphibia, Anura) and reptiles (Reptilia, Testudines, Squamata) in a heterogeneous landscape in west-central Mexico: a checklist and notes on geographical distributions.

In Mexico, land use changes have significantly impacted the diversity of amphibians and reptiles in a negative way. In light of this, we evaluate the alpha and beta components of the taxonomic diversity of amphibians and reptiles in a heterogeneous landscape in west-central Mexico. Additionally, we provide a checklist of amphibian and reptile species recorded over nine years of observations within the studied landscape and surrounding areas. The land cover/use types with the highest species richness and alpha taxonomic diversity differed between amphibians and reptiles. Overall beta taxonomic diversity was high for both groups, but slightly higher in reptiles. This taxonomic differentiation mainly corresponded to a difference in the turnover component and was greater in pristine habitats compared to disturbed ones. The checklist records 20 species of amphibians (ten of which are endemic) and 48 of reptiles (30 endemics). Additionally, the study expands the known geographical distribution range of one species of frog and three species of snakes. Our findings suggest that heterogeneous landscapes with diverse land cover/use types can provide essential habitats for the conservation of amphibian and reptile species.

Precipitation and temperature primarily determine the reptile distributions in China

Reptiles make up one‐third of tetrapods, however they are often omitted from global conservation analyses. Understanding the determinants of reptile distribution is the foundation for reptile conservation research. We assembled a dataset on the distribution of 231 reptile species (nearly 50% of recorded species in China). We then investigated the association of species range filling (the proportion of observed ranges compared to species potential climate distributions) with climate, range size, topography and human activity, using three regression methods. At the species level, we found the most primary factors influencing the recent distribution pattern of reptiles across China were the mean annual precipitation (MAP) and the mean annual temperature (MAT). In contrast, human activity came in last. Similarly, at a spatial level, MAP and MAT were still the most important factors. Geographically, the south and east of China support the highest reptile diversity, partially due to high precipitation. Contrary to the prevailing notion that reptile distributions are primarily shaped by human activities, our study re‐emphasizes the importance of climate in determining reptile distribution. It accentuates the necessity of integrating climate variables into future animal conservation strategies in China. Our findings also offer valuable insights for informing conservation practices, including the site planning of natural reserves and national parks, as well as monitoring of environmental factors in protected areas.

Patterns and drivers of abundance and diversity of reptiles and amphibians in the protected area of Mount Chelmos

Abstract The primary objective of this study was to investigate patterns of abundance and diversity among reptiles and amphibians within the protected area of Mount Chelmos, located in Peloponnese, Greece. Our aim was to examine the drivers influencing abundance (for lizards, snakes, chelonians, anurans, urodels) and diversity (for reptiles and amphibians) within the finely-scaled study area and identify biodiversity hotspots. Land cover significantly impacted the abundance and diversity of all studied groups. Elevation had a significant impact on the abundance of snakes, chelonians, and anurans, as well as on reptile and amphibian diversity. Climate influenced all groups except chelonians. Slope significantly impacted anuran abundance and amphibian diversity. Aspect primarily influenced the abundance of lizards, anurans, and urodels, as well as reptile diversity. We have also identified abundance and diversity hotspots, emphasizing the importance of conservation and management efforts. In reptiles, abundance hotspots were predicted in the west, east, and south of the mountainous massif, whereas amphibian abundance hotspots were mapped to the west and east-southeast of the massif. Regarding diversity, the patterns were similar for both reptiles and amphibians, with hotspots emerging in the west, south, and southeast boundaries of the study area, and a few spots north of the mountainous region. Notably, many of these hotspots coincided with areas susceptible to human exploitation and vehicular transit.

Review of two marine vertebrate assemblages from the Arauco Basin (central Chile) reveals diversity changes throughout the Maastrichtian

Upper Cretaceous vertebrate records from Chile are mostly known by historical mentions with unknown repositories and uncertain stratigraphic provenance. This contribution reviews and complements two marine vertebrate assemblages from the Upper Cretaceous of central Chile, which were part of the ancient Arauco Basin. The oldest assemblage (lower Maastrichtian) comprises abundant condrichthyans referred to Carcharias gracilis, Odontaspis cf. winkleri, Scapanorhynchus sp., Centrophoroides appendiculatus, Squatina sp., Cretorectolobus sp., Orectolobidae indet., Paraorthacodus sp., Ischyrhiza chilensis and Biropristis landbecki, which adds to the previously reported occurrences of Echinorhinus sp. and Myledaphus araucanus. In addition, chimeroids referred to as Edaphodon kawai and remains of a leatherback turtle referable to Mesodermochelys sp. are here described, the latter being its first occurrence outside Japan. The younger assemblage (upper Maastrichtian) includes similar chondrichthyans and a higher diversity of marine reptiles, including plesiosaurians (Aristonectes sp., Aristonectinae indet., and Elasmosauridae indet.), sea turtles (Pancheloniidae indet.) and diverse mosasaurs (Halisaurus sp., Tylosaurinae indet., and the first local occurrence of Plioplatecarpinae indet.). Throughout the Maastrichtian, the local marine vertebrates likely suffered a declination in abundance but a rise in diversity, with evidence of a marked alteration in middle levels of the trophic web during the upper Maastrichtian. This fauna shows a main influence from the northern hemisphere (especially from the Western Interior Sea), acquiring a more marked Weddellian influence during the end of the Maastrichtian. The studied material allows a better understanding of the Upper Cretaceous vertebrate marine fauna in lower latitudes of the southeastern Pacific.

Taxonomic and Functional Diversity of Reptiles in a Heterogeneous Landscape of Jalisco State, West-Central Mexico

Reptiles are threatened by anthropogenic landscape transformation, largely due to agriculture. However, ecosystems nowadays constitute a matrix of fragmented landscapes. We analyzed a heterogeneous landscape’s reptile taxonomic and functional diversity patterns across ten land cover/use types in Jalisco state, in west-central Mexico. At the alpha diversity level, we assessed the taxonomic diversity using q-order indices, and functional diversity with multidimensional indices (FRic, FDiv, and FEve) by land cover/use. We evaluated the differences in species composition among land cover/use types (beta diversity). We utilized multidimensional distance-based analyses (dbRDA) to evaluate the association between reptile diversity, habitat structure, and environmental variables. Species richness did not correlate with functional richness across land cover types overall, except for riparian habitat surrounded by crops (RH-C), which exhibited higher species richness and functional diversity. Secondary vegetation surrounded by temperate forest (SV-TF), riparian habitat surrounded by tropical dry forest (RH-TDF), and RH-C were the land cover/use types with the most functional groups. Herbaceous cover is crucial for preserving both reptile diversity facets in this landscape. These findings suggest that the availability of resources (e.g., riparian habitat and herbaceous cover) regardless of perturbation level could be more relevant for reptile diversity than the condition (tropical vs. temperate) due to the high plasticity and adaptation of the group. It is essential to recognize the ecological value of these habitats by adopting a holistic approach that values the intrinsic and ecological importance of reptile diversity.

Population genetics and phylogeography of Trachylepis sulcata (Peters, 1867) and T. ansorgii (Boulenger, 1907) in south-western Africa

ABSTRACT Ansorge’s Rock Skink Trachylepis ansorgii (Boulenger, 1907) is an Angolan taxon, the taxonomic distinctiveness and geographic distribution of which are poorly understood. It is closely related to the widespread Western Rock Skink T. sulcata (Peters, 1867) from Namibia and South Africa, but heretofore a lack of samples has prevented a comprehensive assessment of T. ansorgii in a molecular phylogenetic context. We combine new genetic sampling from south-western Angola, including topotypical material of T. ansorgii, with published sequences from South Africa and Namibia to identify population structure, phylogenetic relationships, and divergence dates within this species complex. A multi-locus dataset of three nuclear and two mitochondrial loci recovered significant population structuring with a centre of diversity in south-western Angola and northern Namibia. Mitochondrial data recovered seven clades representing distinct geographic populations, while the nuclear data supported either two or three deeper groupings. Mito-nuclear discordance was observed with respect to the geographic boundary between T. ansorgii and T. sulcata. The nuclear data support a break along the western Kunene River (the political boundary between Angola and Namibia), while the mitochondrial data support this break ∼250 km to the north in south-western Angola. A time-calibrated BEAST phylogeny found the deepest species-level divergence to have occurred in the late Miocene/early Pliocene (∼6 mya), potentially related to the formation of the Kunene River. Our results support the recognition of both taxa at the species level, and add further evidence that south-western Angola is a centre of reptile diversity.

Reptile responses to fire across the western Mediterranean Basin

AbstractEffects of anthropogenic activities, including climate change, are modifying fire regimes, and the dynamic nature of these modifications requires identification of general patterns of organisms’ responses to fire. This is a challenging task because of the high complexity of factors involved (including climate, geography, land use, and species‐specific ecology). We aimed to describe the responses of the reptile community to fire across a range of environmental and fire‐history conditions in the western Mediterranean Basin. We sampled 8 sites that spanned 4 Mediterranean countries. We recorded 6064 reptile sightings of 36 species in 1620 transects and modeled 3 community metrics (total number of individuals, species richness, and Shannon diversity) as responses to environmental and fire‐history variables. Reptile community composition was also analyzed. Habitat type (natural vs. afforestation), fire age class (time since the last fire), rainfall, and temperature were important factors in explaining these metrics. The total number of individuals varied according to fire age class, reaching a peak at 15–40 years after the last fire. Species richness and Shannon diversity were more stable during postfire years. The 3 community metrics were higher under postfire conditions than in unburned forest plots. This pattern was particularly prevalent in afforested plots, indicating that the negative effect of fire on reptiles was lower than the negative effect of afforestation. Community composition varied by fire age class, indicating the existence of early‐ and late‐successional species (xeric and saxicolous vs. mesic reptiles, respectively). Species richness was 46% higher in areas with a single fire age class relative to those with a mixture of fire age classes, which indicates pyrodiverse landscapes promoted reptile diversity. An expected shift to more frequent fires will bias fire age distribution toward a predominance of early stages, and this will be harmful to reptile communities.

Exploring the biological richness of Sinaloa: the amphibians and reptiles of the “El Mineral de Nuestra Señora de la Candelaria” reserve

The study on the biological richness of the “El Mineral de Nuestra Señora de la Candelaria” reserve in Sinaloa reveals its outstanding diversity of amphibians and reptiles, as well as the importance of their conservation. Over the years, this reserve, located in Cosalá, has served as a refuge for numerous endemic and protected species, facing challenges such as poaching, habitat degradation, forest fires and complex social problems. Despite these challenges, conservation actions such as environmental education and surveillance have helped mitigate negative impacts. This study highlights the prevailing need to preserve these unique ecosystems to maintain ecological balance, protect the diversity of herpetofauna in the Sierra Madre Occidental and enjoy its ecosystem services, providing a solid foundation for future long-term ecological management and conservation strategies.

Multi-taxon species richness representation within national nature reserves is associated with spatial features, human disturbance and environmental factors in mountains region

The Humboldt’s enigma has continued for many centuries, A multitude of studies have delved into various potential reasons for this richness—from topography and climate to community succession—yet a singular, all-encompassing theory for species richness across multiple taxa in mountain ecosystems remains elusive. In this research, we explored the causes of species richness in mountain multiple-taxa in terms of spatial attributes of protected areas, human disturbance and environmental factors. Initiating our study, we compiled a comprehensive database of all national nature reserves (NNRs) situated in the karst regions of Guizhou province. This was achieved through an extensive multidisciplinary field survey in recent years, resulting in a collection of 40,570 species records. Subsequently, we discerned a complex interplay between species richness, spatial attributes, human disturbance, and environmental factors, which collectively account for over 80 % of the observed variations in mountain biodiversity. Our findings revealed several intricate relationships: Shape index and fragmentation positively influenced the richness of insect, animal, and seed plant species. Conversely, anthropogenic alterations and nighttime light negatively impacted the diversity of amphibians, reptiles, and mammals. Interestingly, we discovered a significant positive association between the richness of fungi, mosses, and ferns and the variables of soil texture and soil water, demonstrating the importance of soils in karst for maintaining biodiversity. To conclude, we evaluated conservation strategies in mountainous regions. It is imperative that the spatial configuration of protected areas be refined to alleviate the detrimental effects of human disturbance. Furthermore, conservation efforts should be customized to the unique climatic and geographic conditions found locally.

Unburnt areas in subtropical woodlands contain distinct reptile communities after extensive wildfire

AbstractExtensive wildfires can have profound impacts on fauna communities by altering the vegetation structure and resource availability. However, unburnt areas within a fire mosaic may be important habitat for wildlife while the surrounding area recovers after fire. To understand the importance of unburnt vegetation for reptiles, we studied community assemblages at 15 burnt and 15 unburnt sites in a subtropical woodland 12 months after a 25 000 ha wildfire. We tested the relative importance of unburnt areas and structural attributes on reptile abundance, richness, and community composition across this landscape. Unburnt areas had higher species richness and diversity, but not overall abundance. Reptile community composition differed significantly between burnt and unburnt areas. Woody debris, which was retained in unburnt areas but depleted in burnt areas, was positively associated with increased reptile diversity and richness. Our results suggest that unburnt areas are vital for maintaining reptile diversity and richness within a woodland landscape after wildfire. These findings demonstrate the importance of ensuring fire management programs retain unburnt patches of vegetation in fire‐prone landscapes to sustain reptile communities.

Updated geographic distributions for Texas reptiles

As is the case for many taxa in the Anthropocene, reptile conservation is challenged by an assortment of human-mediated factors. Distributional data for reptile species can be highly useful for informing conservation action. For example, species occurrence data can be used to model suitable habitat as well as quantify contraction, expansion, or shift in the distribution of a species. Texas, USA has a rich reptile fauna including one crocodilian, 32 testudine, 55 lacertilian, and 82 serpent species. However, literature pertaining to the distribution of these species has not been synthesized for over a decade. The goals of our study were to visually summarize all published distributional data for reptile species in the state with updated distribution maps; to tabulate all novel and historic distribution data that is absent from the last statewide synthesis; and to characterize any taxonomic, geographic, or temporal trends of distribution record reporting that have occurred in the state over the last decade. We discovered a total of 659 records that supplement the maps provided in the last statewide synthesis, 40% of which were found in published materials that predate that synthesis. Regarding distributional records published over the last decade, there was no apparent temporal trend – record reporting across years appeared to be stochastic. The number of records published for reptile families generally followed patterns of species richness, although several families had fewer or more records than would be expected. These results might be due to several factors including species biology, variable rates of potential range spread or contraction, and variable research attention (historically and contemporarily). Spatially, we found hot spots of record reporting in the southern, western, and northern portions of the state. We suspect these represent either a contemporary geographic bias of research attention, historically poor range characterization for reptile species occupying these regions, or a combination of both. We also found cold spots of record reporting in the northwestern portion of the Panhandle. These are likely due to natural patterns of reptile diversity as well as geographically biased research attention. Future work to be conducted on reptile distributions in Texas should include a thorough synthesis and revisiting of the voucher specimen data associated with these records.

The importance of native shrubs on the distribution and diversity of reptiles and amphibians in the central drylands of Southwestern USA.

The importance of native shrubs on the distribution and diversity of reptiles and amphibians in the central drylands of Southwestern USA.

Environmental heterogeneity and lizard assemblages in riparian areas in Cyprus

The island of Cyprus hosts a rich diversity of reptiles, including several endemic species. Reptiles are morecommon in Mediterranean-type shrubland and other open habitats in Cyprus, although riparian formations offeradditional cover and food sources, especially during dry, hot summers. Riparian habitats are often very heterogeneous,an attribute that can be important for lizards since they can utilize a variety of microhabitats crucial for different aspectsof their ecology. Nevertheless, reptilian diversity in riparian systems remains understudied and Cyprus is no exception.The aim of this study was to compare lizard diversity and abundance patterns across seasons and elevations, as well astheir relationships with habitat heterogeneity and protected status of areas along riverbanks, as expressed by presencein or out of Natura 2000 sites. We examined the effects that these factors can have on lizard communities by studyingthree rivers that exhibit variations in environmental conditions. Additionally, we evaluated separately the abundancesof four common species (Snake-eyed Lizard, Ophisops elegans; Troodos Rock Lizard, Phoenicolacerta troodica; CyprusRock Agama, Laudakia cypriaca; and Schreiber’s Fringe-toed Lizard, Acanthodactylus schreiberi) while recording in riparian habitats seven of the 11 Cypriot species of lizards. Diversity and richness were not significantly associated withany of the explanatory variables examined (season, elevation, habitat heterogeneity, and protected status). Moreover,we found no relationship between the abundances of each of the four species and habitat heterogeneity, even thoughthey responded differently to elevation, season, and protected status. Our results suggest that lizard diversity in ripariansystems is high compared to the total number of lizard species found on Cyprus, reaching 60% of the overall richness.

Amphibian and reptile diversity in natural landscapes and human-modified habitats of the Sahara Desert of Algeria: A better understanding of biodiversity to improve conservation

The spatial and seasonal variations in amphibian and reptile diversity were studied in different biotopes (lowlands, desert pavements “Reg,” Sabkhas “salt lakes,” date palm groves, wadis, and urban sites) at the Algerian Sahara Desert. No prior research has explored the connection between the distribution of reptiles and amphibians in Algeria’s Sahara and the environmental diversity of biotopes and landscapes. This study aimed to address this significant knowledge gap by investigating the relationships between Saharan habitats and landscapes and their impact on herpetofaunal presence, abundance, and diversity. The diversity of amphibians and reptiles was assessed based on quantitative data of species captures using nonparametric diversity indices, species richness accumulation curves, and similarity analysis. At the Region of Oued Righ (Northern Sahara Desert), we identified 3 amphibians, 19 lizards, and 10 ophidian species. These 32 species (approximately 30% of the Algerian herpetofauna) were classified into 2 orders (Anura and Squamata), 15 families, and 23 different genera. The study area included 8 protected species in Algeria and 9 endemic species to the Mediterranean region, including 1 amphibian and 7 species of reptiles. Acanthodactylus dumerilii was the most abundant species (20.5% of the total), whereas Chalcides ocellatus occurred in 32.9% of specimens. The highest values of species richness were recorded in palm groves with 22 species and Shannon’s diversity index (H’) was 3.5, whereas the lowest values were obtained in Sabkhas (5 species) and urban sites (7 species). The number of individuals experienced significant variations between study biotopes and seasons. Overall, species richness estimators (Chao2 and Jackknife1) revealed that the current survey achieved 90% of inventory completeness. Estimates and interpolations of species richness showed higher values in urban sites, palm groves, desert pavements, and wadis compared to Sabkhas and lowlands where completeness ranged between 90% and 100%. The analysis of similarity indicated low similarity values (<50%) between biotopes studied. The highest similarities were noted between the mesic biotopes (Sabkhas, wadis, and palm groves), the xeric and undisturbed biotopes (desert pavements and lowlands), whereas urban sites showed a distinct herpetofaunal community that was completely different of that recorded in Sabkhas, wadis, and lowlands.