Gerardo C. Leynaud

Gerardo C. Leynaud
National University of Cordoba, Argentina | UNC · Faculty of of Exact, Physical and Natural Sciences

Dr.

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61
Publications
37,343
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1,154
Citations
Citations since 2016
19 Research Items
774 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140

Publications

Publications (61)
Article
Full-text available
Ectothermic animals depend on environmental temperature to regulate their body temperature. The Chaco Tortoise (Chelonoidis chilensis) is widespread in South America; however, populations are threatened mainly because of the pet trade. We described the activity pattern of C. chilensis relative to environmental temperature under semi-natural conditi...
Article
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Among amphibians, the fossorial habit is an evolutionary strategy to maintain their niches along space and time, avoiding hostile climate conditions. The fossorial frog Lepidobatrachus llanensis has evolved in temperate regions, adapted and distributed in arid subtropical environments, and is divided into two well-defined and isolated populations (...
Article
Human land-use changes represent the most important drivers of biodiversity loss, and amphibians and reptiles represent the most threatened groups of vertebrates globally. However, today there is a general lack of knowledge and little consensus on how land-use changes affect amphibians and reptiles. In order to fill this gap, here we conduct the mo...
Article
Full-text available
Among amphibians, the fossorial habit is an evolutionary strategy to maintain their niches along space and time, avoiding hostile climate conditions. The fossorial frog Lepidobatrachus llanensis has evolved in temperate regions, adapted and distributed in arid subtropical environments, and is divided into two well-defined and isolated populations (...
Article
• The Sierras Pampeanas Centrales, one of the most important extra‐Andean mountain systems of Argentina, harbour endemic and threatened amphibian species. In the past century, two alien predatory fish species (brook trout and rainbow trout) were introduced into rivers and streams of the area where amphibian species breed. • We hypothesized that the...
Article
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Species inhabiting broad altitudinal gradients are particularly exposed to the effects of global climate change (GCC). Those species reaching mountain tops are the most negatively affected. Here, using ecological niche models we estimated the climate change exposure of endemic amphibians of the most important extra-Andean mountain system of Argenti...
Article
Zoo environments represent a useful opportunity for animal research, particularly for species that are difficult to observe in the wild. Moreover, studying the behavior of zoo-housed populations provides important information about the welfare state of animals. We described the behaviors of a zoo-housed population of seven Broad-snouted Caimans (Ca...
Article
Published by the Briti sh Herpetological Society There are many cases of animals reported in localiti es away from natural areas of distributi on for the species. With respect to nati ve freshwater turtles of Argenti na and bordering countries, several populati ons (and single specimens) were reported for areas that cast doubts about their origin,...
Article
We describe a new species of montane pitviper of the genus Bothrops from the Cordillera Oriental of the Central Andes, distributed from southern Peru to central Bolivia. The new species can be distinguished from its congeners by the characteristic combination of a dorsal body color pattern consisting of triangular or subtriangular dark brown dorsal...
Article
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We describe a new species of pitviper of the genus Bothrops from the Peruvian Pampas del Heath, in the Bahuaja-Sonene National Park. Pampas del Heath is an area of seasonally flooded savannas and a northwestern extension of the Gran Chaco Boliviano-Paraguayo. The new species is easily distinguished from its congeners by the exclusive combination of...
Article
Ectotherm species are not capable of generating metabolic heat; therefore, they present different strategies for regulating their body temperatures, ranging from a precise degree of thermoregulation to a passive thermoconformity with ambient temperatures. In reptiles, aerial basking is the most common mechanism for gaining heat. However, among aqua...
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Protected areas have been established historically in residual places where the potential for extractive uses is low, implying that places at risk are usually under-protected. Argentina is no exception, with few protected areas established in productive regions that are prone to conversion. Here, using reptiles as a study group and considering the...
Article
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The subtropical dry forests are experiencing rapid clearing in the southamerican Great Chaco region, mainly for soybean production in Argentina. This is causing biodiversity loss and soil salinization. This forests are unique for the floristic richness and the dense forest cover in a region characterized by semiarid climatic conditions. The authors...
Article
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1. In recent years, decision‐makers in Argentina have allowed the legal import of thousands of specimens of freshwater turtles. Given their invasive potential, many of the imported species have become established and have spread to other countries. 2. The three most commonly imported species recently have been Graptemys pseudogeographica, Trachemys...
Article
Full-text available
Background. Just as for most other tortoise species, the once common Chaco tortoise, Chelonoidis chilensis (Testudinidae), is under constant threat across it distribution in Argentina, Bolivia and Paraguay. Despite initial qualitative description of the species distribution and further individual reports of new locations for the species, there is n...
Article
Full-text available
Global climate change affects the distributions of ectotherms and may be the cause of several conservation problems, such as great displacement of climatic suitable spaces for species and, consequently, important reductions of the extent of liveable places, threatening the existence of many of them. Species exposure (and hence vulnerability) to glo...
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The use of species distribution models’ (SDM) is limited by its performance in terms of accuracy, precision, or the spatial distribution of model errors. Despite the wide acceptance of some standard statistics used to evaluate SDM, there is currently a strong on-going debate as to their use. The “area under the curve” (AUC) is a popular measure use...
Article
Full-text available
The use of species distribution models’ (SDM) is limited by its performance in terms of accuracy, precision, or the spatial distribution of model errors. Despite the wide acceptance of some standard statistics used to evaluate SDM, there is currently a strong on-going debate as to their use. The “area under the curve” (AUC) is a popular measure use...
Article
Full-text available
Amphibians from Sierras Pampeanas Centrales of Argentina: diversity and altitudinal distribution. Sierras Pampeanas Centrales (SPC) mountains are located in Córdoba and San Luis provinces (Argentina) and represent an area of unique biogeographic importance. In this paper we provide a synthesis about the knowledge of diversity and altitudinal distri...
Article
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Snakebite envenoming is an important public health problem worldwide and addressing this issue has turned into a challenge for applied science. In this sense, the study of the distributional patterns of problematic snakes is central in terms of public health. Global Climate Change is affecting the distributional ranges of snakes, so that decisions...
Article
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Terrestrial environments surrounding aquatic resources are important and intensively used by semi-aquatic species. In the present work, terrestrial dispersal and nesting sites of the freshwater turtle Phrynops hilarii were analyzed in the floodplain of the Paraná River, using field data and variables obtained from remote sensing. A total of 112 tur...
Article
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Agricultural expansion generates problems to ecosystems and hinders conservation efforts. Although several researchers worldwide are working to develop efficient approaches for conserving biodiversity adequately, certain decisions should be taken urgently. Here, by using two entire classes of vertebrates (amphibians and reptiles), we calculated opt...
Article
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The High Mountains of Córdoba, Argentina have a long evolutionary history of grazing by large herbivores. However, about 400 years ago, European livestock were introduced and gradually replaced native herbivores. Since the 1920s, domestic herbivores have been the only large herbivores present in the area, causing severe soil erosion and a threat to...
Article
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Carrasco, P.A., Mattoni, C.I., Leynaud, G.C. & Scrocchi, G.J. (2012). Morphology, phylogeny and taxonomy of South American bothropoid pitvipers (Serpentes, Viperidae). —Zoologica Scripta, 41, 109–124. South American bothropoids comprise a monophyletic and greatly diverse group of pitvipers that were initially included in the genus Bothrops and late...
Data
Individual records of Lithobares catesbeianus from its native range used to perfom MaxEnt models and the minimum convex polygon used to calibrate the projections. (TIF)
Data
Results of the Pearson correlation between the 20 variables. (XLS)
Article
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Biological invasion and climate change pose challenges to biodiversity conservation in the 21(st) century. Invasive species modify ecosystem structure and functioning and climatic changes are likely to produce invasive species' range shifts pushing some populations into protected areas. The American Bullfrog (Lithobates catesbeianus) is one of the...
Article
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Argentina is the country with the most geographically extended biological invasion of the American bullfrog (Lithobates catesbeianus) in South America after Brazil. Here, we used a maximum entropy ecological niche modeling algorithm (using records of the native range of American bullfrog) to project the model onto the whole of Argentina. We determi...
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Regionalization studies attempt to divide an area into regions by studying the distribution of its biota. Here we used snake distribution in Central Argentina to recognize distribution patterns, and then compared two methods (cluster analysis and endemism analysis) and the patterns found with previously defined regions. Both analyses recovered Chac...
Article
Differences among wetlands can have important consequences on reproductive success of amphibians; therefore habitat selection is expected to be of particular importance for anurans inhabiting heterogeneous environments. To investigate if the red-belly toad (Melanophryniscus stelzneri; Anura: Bufonidae) uses available habitats differentially and to...
Article
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Bothrops ammodytoides is a pitviper species endemic to Argentina that inhabits arid and semiarid areas from sea level to more than 3000 m, reaching the southernmost latitude for snakes. According to previous studies, the species is placed in the Bothrops alternatus group. We redescribe Bothrops ammodytoides based on examination of 101 specimens and...
Article
The diet of Hydromedusa tectifera occurring in two mountain streams in the province of Córdoba is described through a comparative analysis of 154 individuals. Turtles were manually captured between August 2005 and August 2006 from streams at the localities of Tanti and Flor Serrana. Before being released, turtles were stomach-flushed, and sex and c...
Article
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Objetivos. Describir la distribución de los accidentes ofídicos en la provincia de Córdoba, Argentina, identificar las zonas de mayor riesgo y analizar la utilidad del programa informá-tico SIGEpi. Métodos. Se recopiló la información relacionada con los 299 accidentes ofídicos notificados en la provincia de Córdoba entre los años 1995 y 2006, tomad...
Article
To determine the case distribution of accidental ophidism in the Córdoba province of Argentina, identify high risk areas, and evaluate the usefulness of the SIGEpi software program (Pan American Health Organization, Washington, DC, United States of America). Information regarding the 299 cases of accidental ophidism reported in Córdoba in 1995-2006...
Article
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Richness, diversity and abundance of amphibians and lizards were compared in four sites subjected to different fire and grazing regimes in Mburucuyá National Park (Corrientes, Argentina). The surveys were performed using drift fence–pitfall traps randomly distributed in four sites subjected to the following prescribed fire and grazing regimes: (A)...
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The fecal pellet group count technique was used to estimate gray brocket deer density in a protected area in the west of Córdoba province (Chancaní Reserve), Argentina. Seventy plots were surveyed for brocket pellets on two occasions: summer (February) and winter (August). The density of brockets recorded were 4.41 individuals/km 2 in summer and 5....
Article
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Poco se conoce sobre el comportamiento de la corzuela parda en áreas naturales de Argentina. Se evaluó la relación entre la presencia de heces y variables de hábitat en la Reserva Chancaní, en el sur de la provincia de Córdoba. A su vez, se observó el comportamiento de la especie con cámaras trampa. Se encontró una mayor presencia de heces cerca de...
Article
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The Snake-necked Turtle (Hydromedusa tectifera) is mainly distributed in the northeastern provinces of Argentina; however, some isolated populations occur in central Córdoba. This is the first report on some ecological aspects of one of these populations. Population density and annual activity pattern were characterized at Toro Muerto Stream in the...
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Annual variations of activities of 13 snake species from the province of Córdoba, Argentina, are described based on the analysis of 6838 records of arrivals to the serpentarium of Centro de Zoología Aplicada (Córdoba, Argentina) between 1973 and 2000. The climate in the region is semiarid with mean annual rainfall of 650 mm concentrated in summer a...
Article
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The occurrence of coral snake coloration among unrelated venomous and non‐venomous snake species has often been explained in terms of warning coloration and mimicry. In Argentina, no field tests have been conducted to confirm this mimetic association between one venomous coral species (Micrurus phyrrocryptus, Elapidae) and two non‐venomous snake sp...
Article
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Colubrid snakes of the South American genus Phalotris are difficult to detect because of their secretive habits, and thus they are poorly represented in collections. The species Phalotris cuyanus and P. tricolor, the southernmost representatives of the tricolor species group, were studied to determine the limits of intraspecific variation of P. cuy...
Article
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We report changes in snake and lizard diversity and abundance following 25 years of Chaco forest restoration based on grazing suppression in Salta, Argentina. Reptile diversity and abundance was compared between a restored native forest (Los Colorados Biological Station, 10,000 ha) and an adjacent overgrazed area (Campo Grande, 7500 ha). The follow...

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Projects (3)
Project
To generate useful spatial information for decision makers analyzing biogeographical and ecological patterns of amphibians and reptiles considering the most important human pressures.
Project
Bothropoids are a highly diverse group of pitvipers whose phylogeny is not yet sufficiently clear given the uncertain, unclear or conflicting position of many species. Our goal is to assess the contribution of new data and an increased taxon sampling for the outgroup on clarifying the phylogeny of bothropoids. New data includes new morphological and molecular characters, additional data of poorly known species, data of species described recently, and data of putative new species.