Descripción de los estadios larvales de Sigara (Tropocorixa) jensenhaarupi (Heteroptera: Corixidae), con notas acerca de su ecología

Sigara (Tropocorixa) jensenhaarupi Jaczewski is the smallest species of the subgenus ranging from 4.2–4.7 mm, and it is characterized by the absence of a strigil, the small and narrow genital capsule with a short hypandrium in males, and the shape of the abdominal tergite VII in females. This species is endemic to the Patagonian subregion (Andean region) in Argentina. A monthly sampling study was performed during a year in northern Mendoza, and additional material was collected in southern Mendoza, more precisely from Bañado Carilauquen in the Llancanelo Lake Reserve (Malargüe Department). Since little is known about the ecological requirements of S. (T.) jensenhaarupi, herein we describe its habitat, the environmental conditions and its association with other macroinvertebrates. Also, we provide a morphological description of larval stages, and provide new records of this species.Sigara (Tropocorixa) jensenhaarupi Jaczewski es la especie más pequeña del subgénero (4.2–4.7 mm), y se caracteriza por la ausencia de estrigilo, la cápsula genital masculina pequeña y angosta con el hipandro corto, y la forma característica del tergito abdominal VII en las hembras. Esta especie es endémica de la subregión Patagónica (región Andina) en Argentina. Se realizaron muestreos mensuales durante un año en el norte de la provincia de Mendoza, material adicional fue recolectado en el sur de la provincia, más precisamente en el Bañado Carilauquen en la Reserva Laguna Llancanelo (Departamento de Malargüe). Poco se conoce acerca de los requerimientos ecológicos de S. (T.) jensenhaarupi, por lo que en este trabajo describimos su hábitat, las condiciones ambientales y su asociación con otros macroinvertebrados. Además, describimos los estadios larvales y damos nuevos registros de esta especie.Fil: Melo, María Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología ; ArgentinaFil: Scheibler, Erica Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentin

Diversity of aquatic insects and other associated macroinvertebrates in an arid wetland (Mendoza Province, Argentina)

The goal of this work was to expand the evaluation of diversity of aquatic insects and associated macroinvertebrates along the Bañado Carilauquen using hand net for water column and Petersen dredge for benthos. Additionally, we explored seasonal and spatial differences and similarities of macro invertebrate assemblages' qualitative composition. Samplings were conducted seasonally in five reaches of the Bañado Carilauquen, from headwaters to outlet. A total of 47 taxa were identified; 37 of them were insects, mainly Coleoptera, Diptera and Hemiptera, in this order. Macroinvertebrate composition was more conditioned by the spatial than the seasonal variable at the ends of the gradient. Three faunal groupings were detected: headwaters, middle reach and outlet. The highest richness detected at headwaters was correspondent with the lowest conductivity levels at the Bañado Carilauquen. The least diverse and most different faunal composition was recorded at outlet (highest conductivity levels). In the middle reach, richness levels were higher than expected in relation to conductivity, possibly because of the occasional presence of transient species.El objetivo del trabajo fue expandir la evaluación de la diversidad de insectos acuáticos y macroinvertebrados asociados a lo largo del Bañado Carilauquen, usando red de mano para la columna de agua y draga de Petersen para el bentos. Adicionalmente, se exploraron diferencias y similitudes espacio-temporales en la composición cualitativa de los ensambles de invertebrados. Se realizaron muestreos estacionales en cinco tramos del Bañado Carilauquen, desde la cabecera hasta la desembocadura. Se identificaron 47 taxa; 37 fueron insectos, principalmente Coleoptera, Diptera y Hemiptera, en ese orden. La composición de macroinvertebrados estuvo mejor condicionada por la variable espacial que por la temporal, en los extremos del gradiente espacial estudiado. Fueron detectados tres grupos faunísticos: cabecera, tramo medio y desembocadura. La mayor riqueza detectada en la cabecera se correspondió con los valores más bajos de conductividad del Bañado Carilauquen. La menor diversidad y la mayor diferencia en la composición faunística fueron observadas en la desembocadura (mayores niveles de conductividad). En el tramo medio, la riqueza fue mayor a la esperada según niveles de conductividad, debido posiblemente, a la presencia de especies transitorias.Fil: Scheibler, Erica Elizabeth. Consejo Nacional de Invest.cientif.y Tecnicas. Centro Cientifico Tecnol.conicet - Mendoza. Instituto Arg de Invest. de Las Zonas Aridas; Argentina;Fil: Ciocco, Nestor Fernando. Consejo Nacional de Invest.cientif.y Tecnicas. Centro Cientifico Tecnol.conicet - Mendoza. Instituto Arg de Invest. de Las Zonas Aridas; Argentina

A new Argentinian species of Bembidion (Chilioperyphus) (Coleoptera: Carabidae: Bembidiini) with accessory setae

The new species, Bembidion (Chilioperyphus) cuyanus (type locality ARGENTINA, San Luis, Quebrada Lopez, 7 km SE San Francisco) is described, based on external structural features (extra setae in the supraorbital region, pronotum, elytral margin and intervals 3, 5 and 7) and those of the male genitalia (details of the endophallic flagellum). Line drawings illustrate diagnostic features and a key distinguishes among the species of subgenus Chilioperyphus Jeannel. This species lives along the border of rivers and creeks in the arid region of western Argentina.Fil: Roig, Sergio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Scheibler, Erica Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentin

A new species of Apocellus Erichson, 1839 (Coleoptera: Staphylinidae) from Argentina with ecological notes

Apocellus andinus sp. nov. from Argentina is described and illustrated, detailed information on its ecology is provided, and a key to species of Apocellus from southwestern South America is given. This species was collected in riparian areas of a mountain dam at 1355 m elevation, and it was found in an unstable wetland environment in association with species tolerant to human perturbations. Lectotypes are designated for Apocellus argentinus Bernhauer, 1908 and Apocellus opacus Bernhauer, 1908Fil: Chani Posse, Mariana Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Scheibler, Erica Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentin

Temporal and altitudinal variations in benthic macroinvertebrate assemblages in an Andean river basin of Argentina

Environmental variables and benthic macroinvertebrate assemblages were spatially and seasonally examined over two consecutive years (2000-2002) along a glacier and snowmelt river in the central-west of Argentina where lies the highest peak in America, Mount Aconcagua (6956 m elevation). The goal was to assess seasonal and altitudinal variability in benthic community structure and to define whether physical-chemical variables affect distribution of aquatic insects. The Mendoza River Basin was characterised by high variability in flow and transparency, high conductivity, hard calcium sulphate water, neutral and alkaline pH, and dominant substrate composed of small blocks, cobbles, pebbles, and sand-silt. Richness of invertebrates was low, with the lowest taxonomic richness being recorded at the mouth. The dominant group with highest taxonomic richness was Diptera, although caddisflies, mayflies, beetles, and stoneflies were present. Seasonal and spatial variations in biotic and abiotic variables were detected. Maximal densities and taxonomic richness were recorded in autumn and winter. From Modified Morisita?s Cluster analysis it was found that the system is divided into two groupings of sites related to each other by faunal composition. INDVAL revealed species turnover along the altitudinal gradient of some taxa: Andesiops, Massartellopsis, Edwarsina, Chelifera, and Ceratopogonidae had preference for the headwaters (2835-2425 m elevation), Smicridea murina and Baetodes for the lower section (1413-1085 m elevation), and Austrelmis for the middle and lower sections. The middle section (1846-1727 m elevation) was a transition area where taxa from the headwaters and the lower section coexisted. Generalised Linear Models evidenced that altitude was the major factor determining macroinvertebrate assemblages along the large arid Mendoza River and that the physical-chemical variables that most influenced variation in community structure were: transparency, bicarbonate concentration, pH and substrate type. Our results suggest that benthic macroinvertebrate structure and environmental variables are affected in different ways by seasonal and altitudinal variations.Instituto de Limnología "Dr. Raúl A. Ringuelet

First record of the invasive species Centaurea diffusa Lam. (Asteraceae) in high altitude wetlands, Valle de Uspallata, Mendoza

Centaurea diffusa is an invasive species whose distribution in Argentina covers the Pampean region. We report for the first time its presence in high altitude ecosystems at the Uspallata Valley in the province of Mendoza, Argentina. We provide a description of the specimens, photographic material and information about their habitat requirements and management status in Argentina and in America. Highlights Centaurea diffusa is recognized for being a species with ecological attributes of invasive plants. C. diffusa is native to Eurasia and their introduction in America has occurred accidentally by the entry into bags of alfalfa. The presence of C. diffusa in Argentina has been reported only in the Pampas region (Buenos Aires, Córdoba and La Pampa). We report for the first time its presence in high altitude ecosystems belonging to the Uspallata Valley in the province of Mendoza, Argentina.Centaurea diffusa is an invasive species whose distribution in Argentina covers the Pampean region. We report for the first time its presence in high altitude ecosystems at the Uspallata Valley in the province of Mendoza, Argentina. We provide a description of the specimens, photographic material and information about their habitat requirements and management status in Argentina and in America. Highlights Centaurea diffusa is recognized for being a species with ecological attributes of invasive plants. C. diffusa is native to Eurasia and their introduction in America has occurred accidentally by the entry into bags of alfalfa. The presence of C. diffusa in Argentina has been reported only in the Pampas region (Buenos Aires, Córdoba and La Pampa). We report for the first time its presence in high altitude ecosystems belonging to the Uspallata Valley in the province of Mendoza, Argentina

Temporal and altitudinal variations in benthic macroinvertebrate assemblages in an Andean river basin of Argentina

Environmental variables and benthic macroinvertebrate assemblages were spatially and seasonally examined over two consecutive years (2000-2002) along a glacier and snowmelt river in the central-west of Argentina where lies the highest peak in America, Mount Aconcagua (6956 m elevation). The goal was to assess seasonal and altitudinal variability in benthic community structure and to define whether physical-chemical variables affect distribution of aquatic insects. The Mendoza River Basin was characterised by high variability in flow and transparency, high conductivity, hard calcium sulphate water, neutral and alkaline pH, and dominant substrate composed of small blocks, cobbles, pebbles, and sand-silt. Richness of invertebrates was low, with the lowest taxonomic richness being recorded at the mouth. The dominant group with highest taxonomic richness was Diptera, although caddisflies, mayflies, beetles, and stoneflies were present. Seasonal and spatial variations in biotic and abiotic variables were detected. Maximal densities and taxonomic richness were recorded in autumn and winter. From Modified Morisita?s Cluster analysis it was found that the system is divided into two groupings of sites related to each other by faunal composition. INDVAL revealed species turnover along the altitudinal gradient of some taxa: Andesiops, Massartellopsis, Edwarsina, Chelifera, and Ceratopogonidae had preference for the headwaters (2835-2425 m elevation), Smicridea murina and Baetodes for the lower section (1413-1085 m elevation), and Austrelmis for the middle and lower sections. The middle section (1846-1727 m elevation) was a transition area where taxa from the headwaters and the lower section coexisted. Generalised Linear Models evidenced that altitude was the major factor determining macroinvertebrate assemblages along the large arid Mendoza River and that the physical-chemical variables that most influenced variation in community structure were: transparency, bicarbonate concentration, pH and substrate type. Our results suggest that benthic macroinvertebrate structure and environmental variables are affected in different ways by seasonal and altitudinal variations.Instituto de Limnología "Dr. Raúl A. Ringuelet

Primer registro de la especie invasora Centaurea diffusa Lam. (Asteraceae) en humedales de altura, Valle de Uspallata, Mendoza

Centaurea diffusa is an invasive species whose distribution in Argentina covers the Pampean region. We report for the first time its presence in high altitude ecosystems at the Uspallata Valley in the province of Mendoza, Argentina. We provide a description of the specimens, photographic material and information about their habitat requirements and management status in Argentina and in America.Centaurea diffusa es una especie invasora cuya distribución en Argentina abarca la región pampeana. Se reporta por primera vez su presencia en ecosistemas de altura pertenecientes al Valle de Uspallata en la provincia de Mendoza, Argentina. Se brinda una descripción de los ejemplares, material fotográfico e información sobre sus requerimientos de hábitat y estado del manejo en Argentina y en América.Fil: Tabeni, Maria Solana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Scheibler, Erica Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Bonjour, Lorena de Jesús. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentin

Chironomidae (Diptera) distribution in two fluvial rhitronic systems (Andean and hilly streams), Argentina

Se presentan los primeros registros sobre el estado actual de la composición faunística de larvas de la familia Chironomidae en dos sistemas fluviales: río Mendoza (Mendoza) y río Grande (San Luis), a la misma latitud en una zona cuyana. Se analizaron los patrones de distribución y se comparó su taxocenosis, con sistemas fluviales similares de tipo ritrónicas. En el caso del río Mendoza la subfamilia Orthocladiinae presentó la mayor riqueza genérica (5) siguiéndole Podonominae con tres géneros; mientras que el resto de las subfamilias halladas compuestas por: Chironominae (2), Diamesinae (2) y Tanypodinae (1), exhibieron las densidades genéricas más bajas. En el río Grande el patrón de distribución de las subfamilias mostró que la riqueza genérica máxima la obtuvo siempre Chironominae (11), le siguió Tanypodinae (8) y por último Orthocladiinae (5). Se encontraron diferencias  tanto entre los grupos taxanómicos, la riqueza genérica como en la abundancia relativa de las subfamilias para la región neotropical. En cuanto a la composición faunística, ambos ríos muestran una marcada diferencia, el río Mendoza está predominantemente constituido por elementos patagónicos, en cambio la fauna encontrada en el río Grande está constituida por elementos brasílicos.The first records are presented concerning the current status of faunal composition for Chironomidae larvae (Diptera) from two river systems: Mendoza River (Mendoza) and Grande River (San Luis), at the same latitude in the Cuyo region. Distribution patterns were analyzed and larvae assemblage compared with similar rhitronic river systems. In the case of Mendoza River, the subfamily Orthocladiinae exhibited the highest generic richness (5) followed by Podonominae with three genera; whereas the other subfamilies found, composed of: Chironominae (2), Diamesinae (2) and Tanypodinae (1), exhibited the lowest generic densities. In the Grande River, the distribution pattern of subfamilies always showed the highest generic density for Chironominae (11), followed by Tanypodinae (8) and finally Orthocladiinae (5). Differences between these two environments were found among taxonomic groups in generic richness and relative abundance for the Neotropical region. The faunal composition found in the Mendoza River was made up of Patagonian elements and the Grande River was dominated by brasilic elements.Facultad de Ciencias Naturales y MuseoInstituto de Limnología "Dr. Raúl A. Ringuelet

Chironomidae (Diptera) distribution in two fluvial rhitronic systems (Andean and hilly streams), Argentina

Se presentan los primeros registros sobre el estado actual de la composición faunística de larvas de la familia Chironomidae en dos sistemas fluviales: río Mendoza (Mendoza) y río Grande (San Luis), a la misma latitud en una zona cuyana. Se analizaron los patrones de distribución y se comparó su taxocenosis, con sistemas fluviales similares de tipo ritrónicas. En el caso del río Mendoza la subfamilia Orthocladiinae presentó la mayor riqueza genérica (5) siguiéndole Podonominae con tres géneros; mientras que el resto de las subfamilias halladas compuestas por: Chironominae (2), Diamesinae (2) y Tanypodinae (1), exhibieron las densidades genéricas más bajas. En el río Grande el patrón de distribución de las subfamilias mostró que la riqueza genérica máxima la obtuvo siempre Chironominae (11), le siguió Tanypodinae (8) y por último Orthocladiinae (5). Se encontraron diferencias  tanto entre los grupos taxanómicos, la riqueza genérica como en la abundancia relativa de las subfamilias para la región neotropical. En cuanto a la composición faunística, ambos ríos muestran una marcada diferencia, el río Mendoza está predominantemente constituido por elementos patagónicos, en cambio la fauna encontrada en el río Grande está constituida por elementos brasílicos.The first records are presented concerning the current status of faunal composition for Chironomidae larvae (Diptera) from two river systems: Mendoza River (Mendoza) and Grande River (San Luis), at the same latitude in the Cuyo region. Distribution patterns were analyzed and larvae assemblage compared with similar rhitronic river systems. In the case of Mendoza River, the subfamily Orthocladiinae exhibited the highest generic richness (5) followed by Podonominae with three genera; whereas the other subfamilies found, composed of: Chironominae (2), Diamesinae (2) and Tanypodinae (1), exhibited the lowest generic densities. In the Grande River, the distribution pattern of subfamilies always showed the highest generic density for Chironominae (11), followed by Tanypodinae (8) and finally Orthocladiinae (5). Differences between these two environments were found among taxonomic groups in generic richness and relative abundance for the Neotropical region. The faunal composition found in the Mendoza River was made up of Patagonian elements and the Grande River was dominated by brasilic elements.Fil: Medina, Ana Irene. Universidad Nacional de San Luis; ArgentinaFil: Scheibler, Erica Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Paggi, Analía C.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentin