We studied the thermal tolerances of Odontophrynus occidentalis during dry and wet seasons Monte Desert in San Juan Province, Argentina. This toad had differences CTmax between seasons, with values being greater season (Austral summer). Operative temperature, body environmental maximal temperature were related to suggesting seasonal acclimatization O. occidentalis. Additionally, recorded for was 36.1ºC, maximum ambient measured toads’ activity time 37ºC. The CTmin 4.1ºC while minimum 7.2 ºC....

We compared reproductive parameters of Rhinella arenarum in a wetland the Monte Argentina during and post-reproductive seasons. Individuals were collected at random, monthly from November 2001 to October 2002. August through was considered period, December April period. Of 116 adults, 75 males 41 females. The measured included body mass, fat number mature ova, ova size, testicular volume. There significant differences between periods females for ova. Likewise, also had these mass mass....

Here we describe a new cosmocercid nematode, Aplectana nebulosa sp. nov., from the small and large intestines of Pleurodema nebulosum (Anura: Leptodactylidae), Monte desert San Juan, Argentina. The species belongs to group that possesses gubernaculum unpaired adcloacal papilla anteriorly cloaca. It resembles A. membranosa, paraelenae travassosi by presence four papillae, but differs those following characters: number arrangement precloacal papillae; postcloacal shape size spicules...

We report the first record of Ischnothele annulata (Mygalomorphae: Ischnothelidae) for province San Juan, Argentina. This finding extends its known distribution, marking a new western limit with nearest locations being Chepes and Quines in La Rioja Luis, respectively. The observed population is within arid region central-western Argentina, at ecotone between Arid Chaco Monte Desert.

En este trabajo se documenta la presencia de chinche del arce Boisea trivittata (Say, 1825) (Hemiptera: Rhopalidae) en ciudad San Juan, Argentina. mayo 2024 (otoño austral), identificaron doce especímenes B. trivittata, los cuales encuentran depositados colección Instituto Ciencias Básicas Universidad Nacional Juan. Esta especie, originaria América Norte, no es considerada una plaga su rango distribución nativo, y introducción Sudamérica fue reportada por primera vez Santiago. Nuestro...

We studied body-size and sex-dependent variation in the diet of Rhinella arenarum a wetland San Juan, Argentina. hypothesized that prey size would be positively correlated with toad guts larger toads contain fewer items. Toads from this population eat primarily ants and, secondarily, beetles, indicating feeding strategy is intermediate between specialist generalist. This may influenced by availability. Contrary to our expectation, was not related body size, relationship number positive. Our...

Climate often regulates different aspects of the life cycle and activity amphibians. Climatic seasonality may impose severe restrictions on breeding patterns direct-developing terraranan frogs. We studied influence abiotic cues calling males frog Oreobates discoidalis in Yungas forests north-western Argentina. Vocalization daily emission pattern vocal repertoire were registered with a frog-logger, climatic variables data logger. sampled two reproductive seasons from 2010 to 2011. used...

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El presente trabajo estudia la dieta de una población Leptodactylus ocellatus los Humedales Zonda, San Juan, al oeste Argentina. Se analizaron 35 estómagos, las presas fueron clasificadas y individuos se midieron en ancho largo para calcular su volumen con fórmula esfera elipsoide; además, estimó frecuencia ocurrencia abundancia. calcularon índices diversidad, similitud, amplitud nicho e importancia relativa (IRI). Los mas importantes fueron: Hymenoptera, Anura, Coleoptera. Las mayor...

Albinism has been widely reported for diverse group of vertebrates. However, scoliosis is a rare abnormality. In this work, the first record partial albinism and case in tadpole frog Odontophrynus occidentalis being presented. The individual was captured Quebrada de las Flores, Sierra Pie Palo, Caucete Department, San Juan Province, Argentina.

We describe a new species of Phymaturus from the Sierra La Invernada San Juan Province, Argentina. The shares apomorphies P. palluma group including fragmented subocular, square nonimbricate superciliaries, rugose and strongly mucronate dorsal caudals, midvertebral band enlarged scales. Within group, can be assigned to Puna clade, with which it pattern small, dispersed brown spots lack black reticulations. differs other members clade in several aspects squamation body color. Most notably,...

Abstract Current assessments of organismal vulnerability to global warming are focusing on physiological trait‐based indices that may allow biologically sounding estimates heating risk at the local scale. However, intraspecific variability in both exposure and performance determine large heterogeneity distribution risks through overall species range compromising whole assessments. We examine intra‐ interspecific two indexes: tolerances (WT), or extent maximum temperatures ( T max ) reaching...

Abstract Given the rapid loss of biodiversity as consequence climate change, greater knowledge ecophysiological and natural history traits are crucial to determine which environmental factors induce stress drive decline threatened species. Liolaemus montanezi (Liolaemidae), a xeric-adapted lizard occurring only in small geographic range west-central Argentina, constitutes an excellent model for studies on threats change such microendemic We describe field data activity patterns, use...

The American bullfrog Lithobates catesbeianus has been introduced around the world, with invasive populations reported from almost all South countries. A population of this species was in Calingasta department San Juan province, which is an arid environment western Argentina. This work provides information on dietary composition L. catesbeianus, and compares degree overlap between adults juveniles. Stomach contents 169 bullfrogs (82 87 juveniles) were analysed. Adults consumed 40 prey taxa...

Current knowledge on sexual dimorphism and population structure in the genus Odontophrynus is limited. We studied age structure, at maturity, longevity cf. barrioi, with skeletochronology. also determined whether body size exists this species, evaluated its relation to demographic life history traits. found that females were larger four variables corresponding morphology of head. In addition, O. barrioi have a longer tibia-fibula femur than males. Nevertheless, shows no snout–vent length....

We report a new record of Lithobates catesbeianus (American bullfrog) from Argentina. L. catesbeianuswas first introduced to San Juan Province 11 years ago in Calingasta Department, where the habitat is pre-cordilleran.The for Zonda Province, Monte desert region. Here, usesartificial ponds reproduction and tadpole development. These receive water an irrigation system thatconnects whole agriculture land The tadpoles use canals move among ponds. Wesuggest that legislation should be established...

Male infertility is a disorder of the reproductive system defined by failure to achieve clinical pregnancy after 12 months or more regular unprotected sexual intercourse. The presence low-motile immotile spermatozoa one many causes infertility; however, this observation provides little no information regarding pathogenesis malfunction. Good sperm motility depends on correct assembly tail in testis and efficient maturation during epididymal transit. Thiols flagellar proteins, such as outer...

The regulation of body temperature in ectotherms has a major impact their physiological and behavioral processes. Observing changes thermal parameters related with reproduction allows us to better understand how Rhinella arenarum optimizes resource. aim this study was compare the species between breeding non-breeding periods. In field, we recorded from captured animals, air temperature, substrate. laboratory, measured R. selected on gradient critical extreme temperatures. results our show...