A new species of recluse spider, Loxosceles niedeguidonaesp. n., is described from the Parque Nacional Serra da Capivara, State of Piauí, Brazil. This is the first endemic species described from Brazilian semi-arid environment. The species is included in gaucho group of Gertsch (1967) due to its spermathecal shape and is considered close to Loxosceles chapadensis Bertani, Fukushima & Nagahama, ...

In this paper we present results of an agent-based model of foraging of hominids. The model represents foraging activities in a landscape that is based on detailed measurements of food availability in the modern East African environments. These current landscapes are used as a model for the environment of the hominids one million years ago. We use the model to explore possible rankings of food ...

Drivers of interannual variability in Net Ecosystem Exchange in a semi-arid savanna ecosystem, South Africa S. Archibald, A. Kirton, M. van der Merwe, R. J. Scholes, C. A. Williams, and N. Hanan CSIR Natural Resources and Environment, P.O. Box 395 Pretoria 0001 South Africa School of Geography, Clark University, USA Natural Resources Ecology Lab, Colorado State University, USA Received: 8 July ...

To ensure food security on sustainable basis, reducing weeds interference and boosting land use efficiency are critical. A field study was conducted at research farm of University Agriculture Faisalabad, Pakistan, to sort out the most productive maize-gram intercropping system under semi-arid environment. Treatments included sole maize in single row (60 cm apart) (T1) double rows (90 (T2) strip...

Water scarcity in dry tropical regions is expected to intensify due climate change. Characterization of rainfall events needed for a better assessment the associated hydrological processes, and proposition adaptation strategies. There still no consensus on most appropriate method separate from continuous database, although minimum inter-event time (MIET) commonly used criterion. Semi-arid low l...

We would like to thank our family for the support they provided us and, in particular, we must acknowledge Luana (Milton’s wife) and Yaskara (Pedro’s wife) and our children João Pedro, Maria Eduarda and João Guilherme (Milton’s children) and Yasmin, Yngrid and Pedro Filho (Pedro’s children). We would like to thank too our parents Benedito and Maria José (Milton’s parents) and Paulo and Meyre Es...