Administracion de Parques Nacionales

San Carlos de Bariloche, Argentina

Administracion de Parques Nacionales

San Carlos de Bariloche, Argentina
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Cuyckens G.A.E.,CONICET | Perovic P.G.,Administracion de Parques Nacionales | Herran M.,National University of Salta
Animal Biodiversity and Conservation | Year: 2017

To preserve biodiversity we need to understand how species are distributed and which aspects of the environment determine these distributions. Human-induced changes in land-cover and loss of habitat threaten many species, particularly large carnivores, in many parts of the world. Differentiating the influence of climate and human land use on the distribution of the jaguar (Panthera onca) is important for the species’ conservation. Historically distributed from the United States to southern Argentina, the jaguar has seen its distribution range decreased at regional and local scales. Here we predict the species’ distribution range using historical records of its presence, climate variables, and MaxEnt predictive algorithms. We focus especially on its southernmost limit in Argentina to indicate the historical limits of this species, and describe its present niche in these edge populations. To estimate the effect of human activity we used a raster of land cover to restrict the jaguar’s distribution. We collected a large amount of presence records through the species’ historical range, and estimated a historical regional distribution ranging from Patagonia up to latitude-50°S. Our findings show the range of the jaguar is decreasing severely in its southern limit and also in its northern limit, and that changes in land cover/use are threats to the species. After subtracting non-suitable land-cover from the studied niche, we found the environmentally suitable area for the jaguar in the study area has decreased to 5.2% of its original size. We thus warn of the high extinction risk of the jaguar in Argentina. © 2017 Museu de Ciències Naturals de Barcelona.

Montes de Oca F.,Administracion de Parques Nacionales | Motta L.,Administracion de Parques Nacionales | Plastani M.S.,University of Buenos Aires | Laprida C.,University of Buenos Aires | And 2 more authors.
Journal of Paleolimnology | Year: 2017

Remote lakes of northern Patagonia are ideal sites for examining climate- and non-climate-driven changes in aquatic ecosystems because there is little evidence of human influence and there is no detailed information on recent environmental trends in the region (i.e. the last 200 years). Subfossil chironomids (Diptera: Chironomidae) are useful paleoindicators due to their specific response to numerous environmental factors. Here, we analyze the chironomid subfossil assemblages from two remote lakes located in different environmental settings in Nahuel Huapi National Park of northern Patagonia, Argentina. Chironomids combined with sedimentary pigments (chlorophyll derivatives and total carotenoids) and organic matter provided information on the environmental history of the lakes for the last ca. 200 years. The 210Pb chronology and tephra layers are used to establish the chronology of changes in the chironomid assemblages associated to different environmental factors that impacted the area during the period covered by the study. The deposition of volcanic ash affected the abundance and composition of chironomid assemblage throughout the record of both lakes. However, changing climate conditions and human activities are also responsible for chironomid changes in the last 50 years. © 2017 Springer Science+Business Media Dordrecht

Martinez O.G.,CONICET | Tanco M.E.,CONICET | Prada C.,Complutense University of Madrid | Guerra R.,Administracion de Parques Nacionales
Nordic Journal of Botany | Year: 2014

The gametophytic morphology and development of Alsophila odonelliana (Alston) Lehnert, have been studied through in vitro cultures. This species grows in southern Bolivia and northwestern Argentina. The spores are uniform in structure, but not in size; a certain percentage being smaller than the average. 16 spores per sporangium were found. The germination is of the Cyathea type. It was found that spores stored at 4°C can maintain their viability for over two years. The maximum value of germination depends on spore age. The filamentous gametophytes are 4-16 cells long. Young gametophytes have 1-2 branches that give rise to new gametophytes. Male, female, bisexual and neuter gametophytes were found. Propagules were frequently found in neuter gametophytes, and female and bisexual gametophytes were found to have chlorophyll containing scales. The antheridia are made up of five cells and produce non-viable spermatozoids. The archegonia have necks formed by four columns with four cells each. Most of the gametophytic phase is documented with photomicrographs. © 2014 The Authors.

Soneira P.,Institute Ictiologia del Nordeste | Casciotta J.,National University of La Plata | Almiron A.,National University of La Plata | Ciotek L.,Administracion de Parques Nacionales | Giorgis P.,Administracion de Parques Nacionales
Neotropical Ichthyology | Year: 2010

Astyanax erythropterus (Holmberg, 1891) originally described on the basis of one juvenile, is redescribed herein based on juveniles and adults from the type-localiy. The species differs from its congeners by the combination of 11-13 transverse rows scales above lateral line and 8-10 rows below lateral line; 49-54 perforated scales in the lateral series; iii-v,38-42 anal-fin rays, and dorsal, anal and caudal fins vermilion red in juveniles. The vermilion red coloration of unpaired fins in juveniles of Astyanax is only known in A. correntinus. © 2010 Sociedade Brasileira de Ictiologia.

Giraudo A.R.,CONICET | Vidoz F.,Administracion de Parques Nacionales | Arzamendia V.,CONICET | Nenda S.J.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia
Check List | Year: 2012

We revisit the distribution and natural history data of Tachymenis chilensis chilensis (Schlegel, 1837) in Argentina based on compiled and novel records, extending its northern and southern distribution from the previously known localities in Argentina. We recorded two prey items in Argentinean populations: Rhinella rubropunctata, reported for the first time, and Liolaemus pictus. Tachymenis c. chilensis is mainly found in forested habitats, generally near wetlands with abundant populations of amphibians. The latitudinal range occupied by T. c. chilensis in Argentina is similar to that in Chile, but its northern distribution limit reaches the lowest latitudes in Chile. This is probably due to the higher humidity levels in the western slopes of the Andes and the barrier effect of the highest mountain ranges in this area. © 2012 Check List and Authors.

Chemes S.B.,National University of Santa | Chemes S.B.,CONICET | Giraudo A.R.,National University of Santa | Giraudo A.R.,CONICET | Gil Y.,Administracion de Parques Nacionales
Mastozoologia Neotropical | Year: 2010

It was analyzed the diet of the Lontra longicaudis in El Rey National Park, within the Yungas forest eco-region, in the Argentine Northwest. Our data was compared with that from other populations previously studied in the Iberá Lagoon (Iberá marshes) and the Iguazú River (Paranaense forest) in the Argentine Northeast. We analyzed 130 feces from 37 latrines. Percentage of occurrence, relative frequency, percentage of relative importance and Levin's diversity were analyzed. We compared our results with those from other populations by means of the percentage similarity index, the re-sampling by bootstrapping and non-parametric analysis. We recorded 623 prey items. Fish, insects and crustaceans were more frequently consumed than amphibians, mollusks, reptiles and mammals. The majority of preys were benthonic organisms. Our results were more similar to the ones obtained in the Iberá Lagoon. Other studies in the Iberá and the Iguazú, published by the same author, were more similar between themselves. Differences in trophic adaptability, availability, temporal variation of preys or methodological biases among authors could be possible reasons for the diet differences of the populations studied in Argentina. © SAREM, 2010.

In this communication we provide the first record of the Lesser Sand Plover (Charadrius mongolus) in Argentina and South America. An adult male of the species in breeding plumage was observed and photographed on 30 March 2011 at Punta Rasa, Buenos Aires Province, Argentina. The diagnostic plumage features of the bird refer to the mongolus subspecies group.

Lencinas M.V.,CONICET | Martinez Pastur G.,CONICET | Gallo E.,Administracion de Parques Nacionales | Cellini J.M.,National University of La Plata
Journal of Insect Conservation | Year: 2014

Variable retention is an alternative silvicultural approach to timber forest management, which consist in a regeneration treatment with different degrees and patterns of stand retention. It has been proposed to mitigate harmful effects of harvesting, but effectiveness in insect conservation remains unknown in southern Patagonian Nothofagus pumilio forests. Here, the objectives were to: (1) define a baseline of insect diversity in old-growth forests along a site quality gradient (high, medium and low, associated to the forest productivity of each site); (2) evaluate stands with different retention treatments [aggregated (AR) surrounded by dispersed (DR) retention, and aggregated retention surrounded by clear-cut (CC)] and to compare with old-growth unmanaged forests (OGF); and (3) assess temporal changes during the first 4 years after harvesting (YAH). In a long term forest research plot, mobile epigean insect richness and relative abundance were characterized and classified in seven response type groups, using a wide spectrum sampling set. Data analyses included parametric and permutational ANOVAs, multivariate classification and ordinations. There were found 79 species before harvesting, and that richness was not related to site quality. After harvesting, 84 new species were added considering all treatments along the first four sampled YAH, of which 65 % were added to OGF, while in harvested sites richness and abundance directly diminished with retention degree (OGF > AR > DR > CC) due to incoming species cannot compensate the lost of them. However, fluctuations in diversity were observed along the YAH. Therefore, harvesting reduces insect richness in N. pumilio forests independently of the treatment, but the original insect assemblage significantly changes due to loss of sensitive species and introduction of others from surrounding environments. Despite this, inclusion of aggregates greatly diminished harvesting impacts because insect assemblage is favoured when structural complexity is preserved, conserving richness and abundance at similar levels than in old-growth forests. However, more studies are necessary to evaluate effects of different aggregate size, shape and distribution into harvested forests, as well as their fragmentation and connectivity at landscape level. © 2014 Springer International Publishing Switzerland.

Cuyckens G.A.E.,CONICET | Cuyckens G.A.E.,National University of Jujuy | Perovic P.G.,Administracion de Parques Nacionales | Cristobal L.,Fundacion ProYungas
Journal of Arid Environments | Year: 2015

Determining the geographic range of species is a main objective in ecology and has implications for conservation. Key determinants of carnivore distribution in dry environments are competition and the availability of water. Here, we gathered and mapped the available information on carnivore habitat quality in the high Andes and Puna in the extreme north of Argentina. We investigated four carnivore species: the Andean cat (Leopardus jacobita), the Pampas cat (Leopardus colocolo), the cougar (Puma concolor) and the culpeo fox (Lycalopex culpaeus). We assessed the main determinants of their distribution, testing explicitly for the effects of seasonal and temporal wetlands and biological interactions. We used species distribution models, and created biophysical models using environmental and landscape variables. Then, by including the four species' biophysical models into the model of the focal species, we tested for the importance of biological interactions. Wetlands were most important for the culpeo fox, most likely because it uses aquatic birds as prey. The cougar was the least restricted species in this arid environment, perhaps due to its large home range. In general, environmental variables, distances to wetlands and the annual range of temperature defined species' distributions better than did biological interactions. Only the distribution of the Andean cat, a specialized species, was influenced by biological interactions with the Pampas cat. © 2014 Elsevier Ltd.

Lencinas M.V.,CONICET | Pastur G.M.,CONICET | Gallo E.,Administracion de Parques Nacionales | Cellini J.M.,National University of La Plata
Forest Ecology and Management | Year: 2011

Understory plants could can act as indicators of temperate forest sustainability, health and conservation status due to their importance in ecosystem function. Harvesting impacts on understory plant diversity depends on their intensity. Variable retention has been proposed to mitigate the harmful effects of timber harvesting, but its effectiveness remains unknown in southern Patagonian Nothofagus pumilio forests. The objectives of this study were to: (i) define a baseline of understory plant diversity in old-growth forests along a site quality gradient and under canopy gaps; (ii) evaluate stands with three different variable retention treatments compared to old-growth forests; and (iii) assess temporal changes during 4years after harvesting (YAH). A 61ha N. pumilio forest was selected. Understory plant (Dicotyledonae, Monocotyledonae and Pteridophyta) richness, cover (including woody debris and bare forest floor) and aboveground dry biomass were characterized in summer for 5years. Before harvesting, baseline samples were conducted along a site quality gradient and outside/inside canopy gaps. Analyzed treatments include a control of old-growth forest (OGF) and three different harvesting treatments with variable retention: (i) dispersed retention (DR) of 30m2ha-1 (20-30% retention); (ii) aggregated retention (AR) with one aggregate per hectare and clear-cuts (28% retention); and (iii) combined dispersed and aggregated retention (DAR) with one aggregate per hectare and dispersed retention of 10-15m2ha-1 (40-50% retention). Data analyses included parametric and permutational ANOVAs, multivariate classification and ordinations.Before harvesting, 31 plant species were found, where richness, cover and biomass were directly related to site quality. The presence of canopy gaps did not have a significant impact on the measured variables. After harvesting, 20 new species appeared from adjacent associated environments (two from N. antarctica forests and 18 from grasslands and peatlands). At the stand level, understory values were higher in AR > DR > DAR > OGF. Most (81-95%) plant richness at baseline conditions was conserved in all treatments, where inside the aggregates understory remained similar to OGF. Combination of aggregated and dispersed retention (DAR) better limited exotic species introduction and protected sensitive species, improving conservation in harvested stands. Changes in understory variables were observed after the first YAH in all treatments; greater changes were observed in the harvested areas than in aggregates. Changes stabilized at the fourth YAH. As a conclusion, the location of retention aggregates should be selected to preserve species understory diversity of more speciose and diverse habitats or particularly uncommon stands. Implementation of different kinds (patterns and levels) of retention for improvement of biodiversity conservation in harvested forests should be included in timber and forest management planning. © 2011 Elsevier B.V.

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