The main mesological factors that determine vegetation activity are moisture and temperature (Ferreras Chasco, 2000). Under certain conditions of moisture and temperature a limitation in growth can appear and, if these conditions do not improve, plants can enter into a state called vegetative paralysis. This book discusses the land surface of the basin of the Guadaíra River, and it pays attention to the study of riparian vegetation on different channels that belong to its countryside stretch. It also presents research on the modern spatiotemporal variability of the morphology of High Arctic proglacial rivers; and provides a review on the general properties of ancient Martian systems, focusing on possible issues related to the lack of biogenic effects on Mars, and analyzing mainly riverbank related erosional and depositional structures.
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