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Publications (75)
La situación ambiental por ecorregiones • Un enfoque ecorregional de la problemática ambiental de la Argentina • Propuesta de actualización del mapa ecorregional de la Argentina.A. Brown y S. Pacheco Ecorregiones Puna y Altos Andes • Situación ambiental en las ecorregiones Puna y Altos Andes. C. Reboratti • La declaración de Jujuy sobre el desarrol...
p dir="ltr">To evaluate seedling responses to belowground competition with adult trees, we carried out three root-trenching experiments in the forest understory of the Barro Colorado Nature Monument (BCNM), using four tree species: Aspidosperma desmanthum, Tachigali versicolor, Gustavia superba, and Simarouba amara. Each experiment was crossed with...
Functional traits determine an organism's performance in a given environment and as such determine which organisms will be found where. Species respond to local conditions, but also to larger scale gradients, such as climate. Trait ecology links these responses of species to community composition and species distributions. Yet, we often do not know...
Functional traits determine an organism’s performance in a given environment and as such determine which organisms will be found where. Species respond to local conditions, but also to larger scale gradients, such as climate. Trait ecology links these responses of species to community composition and species distributions. Yet, we often do not know...
Changes in global and regional precipitation regimes are among the most pervasive components of climate change. Intensification of rainfall cycles, ranging from frequent downpours to severe droughts, could cause widespread, but largely unknown, alterations to trophic structure and ecosystem function. We conducted multi-site coordinated experiments...
The Schinopsis balansae forests of the Wet Chaco are characterized by convex areas with woody vegetation and plain areas with herbaceous vegetation. In the Wet Chaco, Aechmea distichantha is a terrestrial bromeliad that forms dense colonies in the understory and open areas of these forests. The aim of this study was to analyze the spatial and tempo...
The eastern Formosa forests of Argentina, belonging to Eastern Chaco District, are distributed following a gradient from the watercourse levee where the ‘Bosque Ribereño’ is placed, through an intermediate zone where the so-called ‘Bosque Transicional’ develops, up to the topographically lower zone where the ‘Monte Fuerte’ forest is located. It has...
Las bromeliáceas terrestres son comunes en los bosques neotropicales. En particular, en el sotobosque de los quebrachales chaqueños existen parches densos de Bromelia serra, que crecen bajo condiciones microambientales heterogéneas. El ambiente lumínico afecta la asignación de biomasa a distintos órganos, por lo que las plantas que crecen bajo dist...
En este trabajo se presenta el primer registro de piche llorón Chaetophractus vellerosus (Cingulata, Dasypodidae) para el sur de la provincia de Santa Fe. Hasta el momento, los registros existentes para esta especie de armadillo comprendían un registro fósil y tres actuales para el norte de la provincia, no existiendo datos para la región sur. En j...
En Argentina, el Pato de Collar (Callonetta leucophrys) y el Sirirí Vientre Negro (Dendrocygna autumnalis) son especies abundantes, pero poco estudiadas. Para describir la distribución estacional de las nidificaciones, el número de huevos/postura y los huevos de estas especies, se trabajó durante seis temporadas reproductivas con cajas nido dispues...
The eastern Formosa forests of Argentina, belonging to Eastern Chaco District, are distributed following a gradient from the watercourse levee where the ‘Bosque Ribereño’ is placed, through an intermediate zone where the so-called ‘Bosque Transicional’ develops, up to the topographically lower zone where the ‘Monte Fuerte’ forest is located. It has...
Las epíftas aportan una gran diversidad específca y brindan numerosos servicios ecosistémicos en los bosques. En el Chaco Húmedo, los estudios sobre epíftas son muy escasos, por lo cual se realizó una descripción de la comunidad de epíftas vasculares de cuatro especies arbóreas deciduas representativas de un quebrachal de la Cuña Boscosa Santafesin...
Flamingos Phoenicopteridae sp. are gregarious birds that travel long distances between breeding and feeding sites. Here we describe the diet and feeding selectivity of two flamingo species, the Andean Flamingo Phoenicoparrus andinus and Chilean Flamingo Phoenicopterus chilensis, which coexist in a lowland area of Argentina. Environmental characteri...
Aechmea distichantha, a widely-distributed facultative epiphytic bromeliad species, is present from rainforests to xerophytic forests. At its southernmost distribution (Humid Chaco) it grows in the understory and forest edges. This animal-pollinated bromeliad shows high phenotypic plasticity on its vegetative traits, but there is no information abo...
There are numerous maps of the spontaneous vegetation of Argentina. However, a country-level map with enough detail to discriminate vegetation units within the phytogeographic provinces described by Cabrera (1946) is lacking. We analyzed vegetation descriptions published in recent decades, with special attention to those that produced physiognomic-...
Existen numerosos mapas de la vegetación espontánea de la Argentina. Sin embargo, no contamos aún con uno de todo el país con una resolución que permita distinguir unidades de vegetación dentro de las provincias fitogeográficas descriptas por Cabrera (1976). Analizamos las descripciones de vegetación publicadas en las últimas décadas, con especial...
Bromeliads are a conspicuous feature of many Neotropical xerophytic forests. Bromelia serra is an understory bromeliad living in xerophytic forests of the Humid Chaco, which shows high phenotypic plasticity when exposed to different environmental conditions. Its infructescences carry many fleshy fruits that are colonized by arthropods from differen...
Las especies de todos los grupos de organismos interactúan y están estrechamente relacionadas con otras por medio de una amplia variedad de mecanismos. Estos se han desarrollado a lo largo del tiempo por coevolución; un proceso permanente de selección recíproca entre organismos interrelacionados. Los sistemas de relación son promotores de la genera...
Las especies de todos los grupos de organismos interactúan y están estrechamente relacionadas con otras por medio de una amplia variedad de mecanismos. Estos se han desarrollado a lo largo del tiempo por coevolución; un proceso permanente de selección recíproca entre organismos interrelacionados. Los sistemas de relación son promotores de la genera...
The pollution of wetlands by lead derived from waterfowl hunting with lead shot was investigated. We determined soil pellet density and Pb concentration in soil, water and vegetation in natural wetlands and rice fields in central-eastern Santa Fe province, Argentina. Pellet density varied greatly among hunting sites (between 5.5-141 pellets/m(2)) a...
We present a waterbird inventory of the Laguna Melincué Ramsar Site in southern Santa Fe province, Argentina. We record 109 species from 28 families of non-passerine birds, including the 14 Nearctic species, four southern austral migrant species, three northern austral migrants, 17 partial migrants, and two altitudinal migrants. The eight most abun...
Pampa de las Lagunas (sur de la provincia de Santa Fe) constituye una de las principales áreas invernales de alimentación de Phoenicoparrus andinus y Phoenicopterus chilensis. El objetivo de este trabajo fue analizar la dieta de ambas especies de flamencos y dilucidar si poseen selectividad trófica. Durante los inviernos de 2011 a 2013, se tomaron...
RESUMEN. La vizcacha (Lagostomus maximus) (RODENTIA: CHINCHILLIDAE) es un roedor de hábitos nocturnos, que habita en colonias de varios individuos. Se considera que a principios del siglo XX sus poblaciones se habrían extinguido de la región pampeana del sur de Santa Fe. En un relevamiento reciente de la mastofauna del área conocida como 'Pampa de...
Perennial grasses are used as overwintering shelters by several arthropod species in the Pampa region. Plant size, structure, and clustering may condition habitat or shelter availability, and therefore their selection by overwintering arthropods. We analyzed the influence of clustering, size and architecture modification of Schizachyrium condensatu...
Numerosas especies de artrópodos invernantes de la región pampeana utilizan a las gramíneas perennes como refugio. Las características estructurales y el tamaño de las plantas, así como su disposición espacial, condicionarían la disponibilidad de hábitat o de refugio y, en consecuencia, la selección de esas plantas por artrópodos invernantes. En es...
Flamingos are gregarious birds that live in brackish lakes. During winter, Andean Flamingo (Phoenicoparrus andinus) and Chilean Flamingo (Phoenicopterus chilensis) inhabit shallow lakes of southern Santa Fe Province, Argentina. Our objectives were to assess the behavioural patterns of these species during winter at Melincué Lagoon, and to evaluate...
Flamingos are gregarious birds that live in brackish lakes. During winter, Andean Flamingo (Phoenicoparrus andinus) and Chilean Flamingo (Phoenicopterus chilensis) inhabit shallow lakes of southern Santa Fe Province, Argentina. Our objectives were to assess the behavioural patterns of these species during winter at Melincué Lagoon, and to evaluate...
We examined the spatial distribution of two bromeliad species with contrasting functional traits in the understory of a xerophytic South American Chaco forest. Aechmea distichantha is a facultative terrestrial species with well-developed phytotelma and short rhizomes, whereas Bromelia serra is a strictly terrestrial species with soil-exploring root...
The Andean Flamingo (Phoenicoparrus andinus), one of three flamingo species in southern South America makes complementary and alternative use of high Andean wetlands in Argentina, Bolivia, Chile and Peru, and lowland wetlands in Argentina over its life cycle. Previous studies have focused on its behavior in Andean sites, but there are no such studi...
En los quebrachales de Schinopsis balansae Engl. de la Cuña boscosa santafesina desarrollan densas colonias de Aechmea distichantha Lem. (Bromeliaceae). Las bases de sus hojas (vainas) se disponen formando un tanque (fitotelmata) donde se acumula agua y materia orgánica, constituyendo un hábitat propicio para el crecimiento de numerosas especies de...
En el sotobosque de los quebrachales de Schinopsis balansae Engl. del norte santafesino hay densas poblaciones de Aechmea distichantha Lem. En el follaje de esta bromeliácea terrestre habitan numerosos artrópodos, sin embargo la información disponible sobre su abundancia y riqueza es escasa. Por ello, el objetivo del presente estudio es analizar la...
The lowland saline shallow lakes in the Pampa de las Lagunas (Argentina), constitute an important habitat for flamingoes Phoenicopterus chilensis Molina and Phoenicoparrus andinus (Philippii). Little is known about the zooplankton communities of these systems, and their relationships with the temporal and spatial distribution of flamingoes. Ten sha...
The lowland saline shallow lakes in the Pampa de las Lagunas (Argentina), constitute an important habitat for flamingoes Phoenicopterus chilensis Molina and Phoenicoparrus andinus (Philippii). Little is known about the zooplankton communities of these systems, and their relationships with the temporal and spatial distribution of flamingoes. Ten sha...
James's Flamingos (Phoenicoparrus jamesi), also known as Puna Flamingos, are distributed primarily in the Andean wetlands of southern South America during the breeding season, and dispersed through the lowland wetlands in Argentina during the non-breeding season. However, the main sites where they concentrate during the non-breeding season still re...
El nombre Schinopsis fue establecido por Engler (1876) a partir de la unión del antiguo nombre Schinus (i.e. ‘lentisco’, Pistacia lentiscus L.) con la partícula -opsis (i.e. ‘parecido a’); es decir, plantas semejantes/
parecidas al ‘lentisco’ (Muñoz, 2000). Se trata de un pequeño género de mucha importancia económica nacional e internacional, cuya...
Bromelia serra Griseb. (Bromeliaceae) is a terrestrial herb that grows in the understory of Chaco and Cerrado woodlands. In this study, the effects of temperature, light environment and scarification on seed germination were analyzed. Two temperature regimes (15/20 ºC and 20/30 ºC), three light environments (Light, Filter and Darkness; 100% light a...
Several authors have reported phenotypic plasticity for bromeliad plants growing in contrasting habitats. Morphological and physiological differences of leaves seem to be an adaptation to water and light use, but there is also a compromise between carbon gain and the costs of sustaining static and dynamic loads. We hypothesized that plastic respons...
Southern Santa Fe Province in Argentina has many shallow lakes embedded in a landscape where 70%of the area is used as grazing pastures and agricultural fields. These lakes are key lowland habitats for Andean Flamingos Phoenicoparrus andinus, especially during winter when some of the lakes in their primary habitats in the Andes of Argentina, Bolivi...
El sotobosque de los quebrachales de Schinopsis balansae del Chaco Oriental está frecuentemente cubierto por densas poblaciones de dos bromeliáceas terrestres (Aechmea distichantha y Bromelia serra). Estas bromeliáceas actúan como trampas que capturan propágulos y hojarasca que cae desde la copa de los árboles. Estas poblaciones son a veces removid...
1. The macrofauna living inside the phytotelmata or on the foliage of bromeliads could be directly affected by habitat and seasonality. Habitat may also have indirect effects by affecting plant morphology.
2. In Chaco forests, a facultative epiphytic bromeliad ( Aechmea distichantha ) shows different morphology when growing in sun and shade conditi...
Plants show different morphologies when growing in different habitats, but they also vary in their morphology with plant size. We examined differences in sun- and shade-grown plants of the bromeliad Aechmea distichantha with respect to relationships between plant size and variables related to plant architecture, biomass allocation and tank water dy...
Until the beginning of the twentieth century there were extensive subtropical seasonal thorny forests surrounding the Pampas
grasslands of Argentina, known as the ‘Espinal’. In central Argentina there still exist relicts of the Espinal, belonging
to the ‘Entrerrianense District’. These forests were never described or analyzed in detail. In 2004 we...
In southern humid Chaco forests dominated by Schinopsis balansae, woody plants are clumped and species composition varies spatially over short distances. We examined how these spatial patterns are associated with local environmental heterogeneity for three size classes of woody individuals: adults, saplings, and seedlings. Our study was based on th...
Some large-seeded tree species have cotyledonary reserves that persist for months after seedling establishment. We carried out two screened growing-house experiments with seedlings of Gustavia superba (Lecythidaceae) to test hypotheses proposed to explain why cotyledons are retained. We grew seedlings from large and small seeds in sun and shade to...
In tropical lowland rain forest (TLRF) the leaves of most monocots differ from those of most dicots in two ways that may reduce attack by herbivores. Firstly, they are tougher. Secondly, the immature leaves are tightly folded or rolled until 50-100 % of their final length. It was hypothesized that (a) losses of leaf area to herbivorous invertebrate...
El Espinal Periestépico, que rodea a la estepa pampeana por el suroeste, oeste y norte, consiste en bosques y sabanas de Prosopis, Acacia, Celtis y Geoffroea. En la provincia de Santa Fe su área se ha contraído y fragmentado como consecuencia directa e indirecta de la acción del hombre. En su reseña sobre el viaje hasta Santa Fe realizado en 1833,...
In several tropical and subtropical forests, plants of the understorey act as an ecological filter that differentially affects woody species regeneration. In convex sectors of the Schinopsis balansae (Anacardiaceae) forests of the Southeastern Chaco there are dense colonies of terrestrial bromeliads. These may influence forest regeneration by inter...
Although competition between plants is nearly universal in vegetation, we know relatively little about belowground competition and how it interacts with aboveground competition in tropical forests, and almost nothing about such interactions on soils of intermediate fertility in sites with a moderate dry season, despite the fact that such forests ar...
We conducted 14 bird surveys in the Melincu saline lake from 1992 to 2002 (7 in winter and 7 in summer), and we detected 223,643 individuals belonging to 71 species from 17 families. The more abundant species were Fulica leucoptera, Larus maculipennis, Phoenicopterus chilensis, Plegadis chihi, Anas platalea, Himantopus mexicanus, and Rollandia roll...
En los quebrachales de Schinopsis balansae del Chaco santafesino crecen densas colonias terrestres de Aechmea distichantha. La materia orgánica y el agua de lluvia se acumulan entre las bases de sus hojas (tanque), creando un hábitat propicio para la macrofauna. Aechmea desarrolla tanto al sol como a la sombra del sotobosque, pero las plantas prese...
In southern humid Chaco forests dominated by Schinopsis balansae, woody plants are clumped and species composition varies spatially over short distances. We examined how these spatial patterns are associated with local environmental heterogeneity for three size classes of woody individuals: adults, saplings, and seedlings. Our study was based on th...
Spatial heterogeneity of a Schinopsis balansae forest ("Quebrachal") near Vera (Santa Fe, Argentina) was studied for any correlation between woody species distribution and environmental factors. This type of forest is the most important community of the Santa Fe Forest Wedge, which is the southernmost portion of the Eastern Chaco. Thirty two 10 × 1...
Amazonia and the Gran Chaco are the largest phytogeographic units of tropical and subtropical South America. The Santa Fe Forest Wedge is the southernmost portion of the Eastern Chaco, where the Schinopsis balansae forest (Quebrachal) is the most widespread and characteristic community. A detailed analysis of the floristic composition, physiognomy...
Resumen: Describimos patrones de heterogeneidad estructural de los bosques de la Cuña Boscosa Santafesina en tres diferentes escalas espaciales. Primero, examinamos la distribución de las distintas formaciones leñosas en el paisaje; luego analizamos la heterogeneidad interna de una de ellas, el bosque de Schinopsis balansae y finalmente la heteroge...
Varias especies de árboles exóticos son mencionadas como subespontáneas en la región pampeana. Gleditsia triacanthos se instala ocasionalmente con éxito en pastizales. El Parque Villarino ha sido invadido por varias especies leñosas. Extrañamente, G. triacanthos no coloniza sectores del Parque pese a la presencia de algunos adultos. El objetivo del...
