Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

With the purpose of generating information on the Natural History and behavior of the terrestrial fauna in the locality of Limoncocha. Were made tours of sampling day and night during august and october 2019. Through photographic records we know four predatory events where the Herpetofauna acts as an ecosystem and prey. We have Leptophis cupreus hung by a tree consuming Boana geographica. To Cyanocorax violaceus perched on the branch of a tree preying on Dendropsophus reticulatus. Two occasions where Ctenus sp., capture juvenile Allobates insperatus. To Milvago chimachima carrying Epicrates cenchia in his claws. It is provided with important records of Natural history that nourish the knowledge of interactions between terrestrial fauna like anurans, snakes, birds and an arachnid, present in Ecuador and the Neotropics.

Evidence of occurrence of Lowland Tapir (Tapirus terrestris) and Giant Anteater (Myrmecophaga tridactyla) in the province of Santa Fe, Argentina, is scarce, mainly in the case of the tapir whose current occurrence is still debated. Between the 22nd and 24th of February 2020, both species, categorized as “Vulnerable” both nationally and internationally, were recorded and documented 28 km north of the town of Villa Guillermina (Santa Fe), confirming their current presence in the province. Records were made in the north of the Cuña Boscosa santafesina, a region of approximately 10,000 km2 composed of various types of forests, palm groves, savannas and marshes characteristic of the Humid Chaco ecoregion. These environments continue towards the Province of Chaco, constituting a remnant or biological corridor that increase the available habitat for these threatened species. Some factors that constitute potential threats to these species, such as livestock activity, hunting pressure, presence of domestic dogs, grassland burning and deforestation, were observed in the area. The importance of conserving the environments of the Humid Chaco ecoregion locatedin the north of the province of Santa Fe that are underrepresented in the Provincial System of Natural Protected Areas is highlighted because these contain species with conservation priority such as tapir and Giant Anteater in addition to presenting the greater biodiversity within the provincial territory.

Identified and reviewed taxonomically are the hyperparasitoids (Hymenoptera: Chalcidoidea) in Argentina and Paraguay associated with Hypogeococcus spp. (Hemiptera: Pseudococcidae), mealybugs that feed on various native cacti (Cactaceae) as well as some Amaranthaceae and Portulacaceae. The following genera and species were collected and reared in the course of surveys conducted in Argentina during 2010–2019 and in Paraguay during 2016–2019: Chartocerus argentinus (Brèthes) stat. rev. [reinstated as a valid species from the previous synonymy with Chartocerus niger (Ashmead)] and Chartocerus axillaris De Santis from Argentina (Signiphoridae), an undescribed Cheiloneurus sp. from Paraguay and Prochiloneurus argentinensis (De Santis) from Argentina (Encyrtidae). These are secondary parasitoids via Encyrtidae primary parasitoids of Hypogeococcus sp., candidate biological control agents against a Hypogeococcus sp. (commonly called the Harrisia cactus mealybug) that is devastating the native columnar cacti in Puerto Rico. The previously unknown male of Chartocerus argentinus is described, and a lectotype is designated for  Signiphora argentina Brèthes. Taxonomic notes are provided for Ablerus platensis (Brèthes) (Hymenoptera:Azotidae), for which a lectotype is designated (for Dimacrocerus platensis Brèthes); it is newly recorded from Paraguay. Hyperparasitoids can be detrimental to biological control programs, but their impact has often been unknown or underestimated. Taxonomic identification of the hyperparasitoids is the first step in assessing the potential negative impact to the natural control of Hypogeococcus spp. in South America.

In this current study, we examine the abundances and breeding phenology of three sympatric grebes (little, great crested and black-necked grebes) in Dayet El Ferd. These grebes were observed during all the period (2011-2018) in this wetland, except in September when the great crested grebe leaves the region. The abundances of these three grebes show a significant difference. In 2017, the total number of 71 nests was measured. The mean clutch size was 5.23 ± 1.49 eggs per nest. The highest number of eggs per nest was ten eggs, and most nests contained three eggs (N=18).

 Holokinetic chromosomes lack of a primary constriction and they are mainly found in insects including order Dermaptera commonly known as “tijeretas”. Members of the genus Doru are pest predators on corn, sugar cane and cotton crops and they are widely distributed in South America. Two species occur in Argentina: D. lineare (Eschs.) and D. luteipes (Scudder). The material was collected in the province of Tucumán (Argentina). In order to stain the chromosomes, classical staining techniques as well as DAPI fluorescent method were applied. The comparative analysis between D. luteipes and D. lineare reveals that both taxa have a haploid formula n = 10 (9A + XY) and 2n = 20. In addition, numerous meiotic irregularities were found and holokinetic chromosomes that gradually vary in size and lack of primary constrictions were observed. Cytogenetic information of D. luteipes is presented for the first time, the first karyotype descriptions for both species are performed and it is discussed the possible diploid origin for the genus.  

This study describes the first data on reproductive aspects of Euphonia chlorotica in Bolivia by monitoring a nest built in a hanging planter inside a house located in Santa Cruz de la Sierra. The nest was globular in shape with a lateral entrance typical of the species and was built within 6 days in December 2019. Three whitish eggs with dark brown spots were incubated for 16 days exclusively by the female. The nestlings hatched synchronously on January 25, 2020 and after 16 days they left the nest with their plumage fully developed, except for the length of the tail feathers, and with the beaks still with the characteristic yellow commissure of the juvenile. The feeding of the nestlings was carried out by both parents and the probability of daily nest survival and nesting success was 100% despite being in a highly urbanized environment.

Within the framework of a bird monitoring program that reproduce in the northeast of Buenos Aires province, we present observations of rare birds in this habitat and provide information on the dates and type of habitat where the observations occurred. We focus on species whose distribution does not regularly include the northeastern of Buenos Aires province (Spot-winged Falconet Spiziapteryx circumcincta, Squirrel Cuckoo Piaya cayana, White Woodpecker Melanerpes candidus, Smooth-billed Ani Crotophaga ani, Scaly-headed Parrot Pionus maximiliani, Yellow-chevroned Parakeet Brotogeris chiriri, Scissor-tailed Nightjar Hydropsalis torquata and Black-backed Water- Tyrant Fluvicola albiventer) and in order to contribute field data to the distribution of these birds with few records in the area. 

Anuran amphibians show the largest diversity of amphibian reproductive modes, many of which imply egg deposition out of the water. This kind of egg deposition requires specialisations to avoid egg desiccation. Physiological, anatomical and ethological traits integrate to define these modes. In particular, morphological features of the urogenital system correlate with these reproductive modes and the environmental conditions where egg-laying occurs. In this study, we describe the testicular histology and spermatogenesis of the nest building frog Leptodactylus latinasus, and we compare it with other species that breed out of water. We found variations in tes tis size, the thickness of interstitial tissue, tunica albuginea, and peritubular tunics, flagellum length, and in the shape and size of the spermatozoal nucleus. Certain specifics’ characters differed at the species level, but not between families. Such variation could be an indicator of spermatozoal performance and environmental constraints under which fertilisation takes place.

A multivariate characterization and subsequent cartography of the profiles of a sample of 164 environmental criminals of the Barinas state, Venezuela, was carried out, based on information coming from the sentences published by the courts of this state, during the 2005-2014 period. To develop the profiles, the two-stage cluster analysis was used. The multivariate sociodemographic profiling showed four types of ecological offenders: 1) Mixed group (men and women); 2) Young group, which is the largest with 43.5% of individuals in the sample; 3) Group of married; and 4) Group of foreigners, which is the lowest (12.9%). The other result shows that the commission of environmental crimes presents a marked geospatial dependence since they tend to be concentrated on the central and southwestern municipalities of the state.

Bioecological observations on a species of the genus Latrodectus (Walckenaer, 1805) of the mactans group, from Sierra de la Ventana (Buenos Aires province, Argentina) (Aranae, Theridiidae), part 3. Post-embryonic development?. Ontogenic development of Latrodectus sp. (mactams group) from Sierra de la Ventana is studied. Females that were collected during summer time, made cocoons in the laboratory. The spiders have been reared from egg to adult stage. The length of each larval and nymphal instars and the changes occurred during the development are described. The principal findings were: 1) There are 3 post-embryonic stages. 2) Males reached the adult stage with 6 to 8 moults (mean 7) and females with 9 to 11 moults (mean 10).