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'''Use of resources by the subterranean rodent Ctenomys mendocinus (Rodentia,Ctenomyidae), in the lowland Monte desert, Argentina'''

S. Albanese, D. Rodrıguez, M.A. Dacar, R.A. Ojeda

The feedback between organisms and their environment is of great relevance to the understanding of
ecosystem functioning. Particularly, subterranean mammals living on desert systems play an important
role in ecosystem processes modifying their environment and influencing the life strategies of plants and
animals. The mendocino tuco-tuco Ctenomys mendocinus, is a fossorial rodent inhabiting a wide range of
soil and climate conditions in the central arid lands of Argentina. The purpose of our study was to
quantify the degree of environmental segregation: soil properties and vegetation in four habitat types,
their impact on woody vegetation, and diet. The highest activity was recorded in sand dunes and was
associated with high habitat heterogeneity and soft soils. Degree of herbivory varied among habitats,
with Lycium (Solanaceae) being the most gnawed shrub. Tuco-tucos behave like folivorous grazers,
feeding on leaves of grasses, mostly Panicum (Poaceae). This is the first study integrating multiple
approaches of tucos’ auto-ecology in a heterogeneous desert matrix, suggesting a differential use of its
environment, possibly according to food supply and soil hardness. Despite life underground impose
general constrains for most subterranean species, our results suggest that both above and under ground
habitat features play important roles in the occurrence of fossorial rodents.