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Biogenic effects might also influence the geomorphology of fluvial systems. An important issue in this aspect is the separation of abiogenic effects, what is quite difficult on the Earth as small level of bacterial influence is present almost at all locations. One possible solution would be the analysis of fluvial systems beyond the Earth. Here Martian fluvial structures are overviewed in this aspect, comparing the related effects and consequences on the two planets. Although our knowledge in this topic is not enough yet for firm conclusions, it is worth evaluating this question already. Based on the review presented here higher fluctuations of discharges, elevated influence of subsurface waters, and weaker bank stability is expected without biogenic effects. Beside these issues Martian systems also provide useful information on the connection between climate change and fluvial systems, as the range of climatic fluctuations were much larger on Mars than here on Earth.
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