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Soil Erosion Thresholds and Alternative States in Northeastern Patagonian Rangelands
Abstract In semiarid rangelands, continuous grazing may decrease vegetation cover, accelerating soil erosion and eventually causing a transition to an alternative, degraded state.Expand
Selective erosion of clay, organic carbon and total nitrogen in grazed semiarid rangelands of northeastern Patagonia, Argentina
In arid and semiarid rangelands, soil erosion has been widely considered an important soil degradation process and one of the main factors responsible for declining soil fertility. In this study, weExpand
Modification of the motor reflex responses due to repetition of the peripheral stimulus in the cockroach. I. Habituation at the level of an isolated abdominal ganglion.
1. In the cockroach Blabera cranufer repeated air puffs to the cerci induce a habituation of the corresponding escape reflex, which we have tried to relate to the transfer properties of the twoExpand
Modification of the motor reflex responses due to repetition of the peripheral stimulus in the cockroach. II. Conditions of activation of the motoneurones.
1. The synaptic transfer properties within the 3rd thoracic ganglion (T.G.) from the abdominal cord axons to the motoneurones has been studied in the cockroach. This ganglion was completelyExpand
Effects of soil degradation on infiltration rates in grazed semiarid rangelands of northeastern Patagonia, Argentina
Abstract In grazed semiarid ecosystems, considerable spatial variability in soil infiltration exists as a result of vegetation and soil patchiness. Despite widespread recognition that importantExpand
Soil erosion rates in rangelands of northeastern Patagonia: A dendrogeomorphological analysis using exposed shrub roots
Abstract Soil erosion is an important process of land degradation in many rangelands and a significant driver of desertification in the world's drylands. Dendrogeomorphology is an alternative toExpand
Spatial variation in tree demography associated to domestic herbivores and topography: Insights from a seeding and planting experiment
Abstract Tropical and subtropical high mountains forests are mainly situated within ravines. Two alternative and often confronted explanations have been proposed for this pattern: that abioticExpand
What are the so-called ‘cercal nerves’ in the cockroach Blabera craniifer?
The branching of the nerves which issue from the terminal abdominal ganglion and the structures innervated by these branches were studied in the cockroach Blabera craniifer. The results indicate inExpand
Functional and anatomical aspects of leg innervation in the giant cockroach Blabera craniifer as compared with that in the american cockroach Periplaneta americana
Abstract 1. 1. Leg innervation in the cockroach Blabera craniifer is described and compared to that already described in Periplaneta americana. 2. 2. The peripheral distribution of the nerves isExpand
Exposed roots as indicators of geomorphic processes: A case-study from Polylepis mountain woodlands of Central Argentina
Abstract Soil erosion is a serious problem of land degradation in many parts of the world, and particularly in mountain rangelands. To understand this process it is necessary to develop methods toExpand