Distribución del cangrejo rojo Procambarus clarkii Girard, 1859 (Decapoda, Cambaridae) en Extremadura

This paper presents the distribution of red swamp crayfish in Extremadura based in samplings carried out in 407 grid cells (10 x 10 km) derived from the standard UTM map. Red swamp crayfish was found in 69.77% of sites surveyed. Thus this species inhabits in practically all region except for areas higher than 750 m of altitude. Males outnumbered females for all size classes. Sex ratio was 1.41:1.En este trabajo se presenta la distribución del cangrejo rojo en Extremadura en base a los muestreos realizados en 407 cuadrículas de 10 x 10 km, habiendo sido detectado en 69.77% de las cuadrículas prospectadas, por lo que llega a ocupar la casi totalidad de la región con excepción de las zonas con altitudes superiores a 750 m. En todas las clases de talla analizadas predominan los machos sobre las hembras en una relación 1.41:1

Hallazgo reciente de la anguila Anguilla anguilla (Linnaeus, 1758) y de la lamprea marina Petromyzon marinus Linnaeus, 1758 en la cuenca extremeña del río Guadiana (suroeste de la Península Ibérica)

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Defining the importance of landscape metrics for large branchiopod biodiversity and conservation: the case of the Iberian Peninsula and Balearic Islands

The deficiency in the distributional data of invertebrate taxa is one of the major impediments acting on the bias towards the low awareness of its conservation status. The present study sets a basic framework to understand the large branchiopods distribution in the Iberian Peninsula and Balearic Islands. Since the extensive surveys performed in the late 1980s, no more studies existed updating the information for the whole studied area. The present study fills the gap, gathering together all available information on large branchiopods distribution since 1995, and analysing the effect of human population density and several landscape characteristics on their distribution, taking into consideration different spatial scales (100 m, 1 km and 10 km). In overall, 28 large branchiopod taxa (17 anostracans, 7 notostracans and 4 spinicaudatans) are known to occur in the area. Approximately 30% of the sites hosted multiple species, with a maximum of 6 species. Significant positive co-occurring species pairs were found clustered together, forming 4 different associations of large branchiopod species. In general, species clustered in the same group showed similar responses to analysed landscape characteristics, usually showing a better fit at higher spatial scales.Brazilian Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq [401045/2014-5]Spanish Ministry of Education, Culture and Sport [FPU014/06783]info:eu-repo/semantics/publishedVersio

Abundancia de artrópodos epigeos en parcelas con diferentes cultivos

The study of soil arthropods can provide valuable information how ecosystems respond to different management practices. The objective was to assess the total abundance, richness, and composition of epiedaphic arthropods in different agrosystems from southwestern Spain. Six sites with different agricultural uses were selected: olive grove, vineyards, olive grove with vineyards, wheat fields, fallows (150-300 m long), and abandoned vineyards. Crops were managed in extensive. Field margins were used as reference habitats. At the seven sites a total of 30 pitfall traps were arranged in a 10 × 3 grid. Traps were arranged to short (SD, 1 m), medium (MD, 6 m) and large (LD, 11 m) distance to the field margins in the middle of selected plots. Pitfall traps captured a total of 11,992 edaphic arthropods belonging to 11 different taxa. Soil fauna was numerically dominated by Formicidae (26.60%), Coleoptera (19.77%), and Aranae (16.76%). The higher number of soil arthropods were captured in the field margins followed by the abandoned vineyard. Significant differences were found between sites for total abundance, and zones. However, no significant differences for total abundance were found between months (April-July). Richness and diversity was highest in field margins and abandoned vineyards. Significant differences were found for these variables between sites. Our results suggest that agricultural intensification affects soil arthropods in Tierra de Barros area, a taxonomic group with an important role in the functioning of agricultural ecosystems.El estudio de los artrópodos puede aportar información de interés de cómo los ecosistemas responden a las diferentes prácticas de manejo del suelo. El objetivo de este estudio fue determinar la abundancia, la riqueza y la composición de artrópodos epigeos en diferentes agrosistemas del suroeste de España. Se seleccionaron seis parcelas con diferentes usos agrícolas: olivar, viñedo, plantación mixta de viñedo-olivar, cereal, barbecho y viñedo abandonado, utilizándose los linderos como sistemas de referencia. En cada parcela se colocaron 30 trampas de caída en una cuadrícula de 10 × 3, de modo que cada línea de trampas quedó colocada a una distancia corta (SD, 1 m), media (MD, 6 m) o grande (LD, 11 m) de los linderos. Se capturaron un total de 11.992 artrópodos edáficos, pertenecientes a 11 taxa diferentes. Numéricamente la fauna del suelo estaba dominada por Formicidae (26,60%), Coleoptera (19,77%) y Aranae (16,76%). El mayor número de artrópodos se capturó en los linderos y en la viña abandonada, encontrándose diferencias significativas en la abundancia entre las diferentes parcelas y las zonas donde se ubicaron las líneas de trampas. Sin embargo, no se encontraron diferencias entre los distintos meses estudiados (abril-julio). La riqueza y la diversidad fue mayor en los linderos y en la viña abandonada, encontrándose diferencias entre parcelas para estas variables. Nuestros resultados sugieren que la intensificación de la agricultura afecta a los artrópodos en Tierra de Barros, un grupo taxonómico con un importante papel en el funcionamiento de los ecosistemas agrícolas

Primeras citas de Cionus scrophulariae (Linnaeus, 1758) (Coleoptera: Curculionidae) en Extremadura (SO de la Península Ibérica)

Cionus scrophulariae (Linnaeus, 1758) (Coleoptera: Curculionidae) is cited for the first time in Extremadura on several species of the genus Scrophularia (Plantae: Scrophulariaceae).Se cita por primera vez a Cionus scrophulariae (Linnaeus, 1758) (Coleoptera: Curculionidae) en Extremadura sobre varias especies del género Scrophularia (Plantae: Scrophulariaceae)