• Sanda Iepure

     April 9, 2021

Guest Editors: Special Issue in Frontiers in Ecology and Evolution

Sanda Iepure, Institute of Speleology “Emil Racovita”, Cluj Napoca, Romania

Tiziana di Lorenzo, Istituto di Ricerca sugli Ecosistemi terrestri, Firenze, Italy

Subterranean ecosystems are characterized by total darkness, low levels of oxygen, relatively stable environmental conditions and limited of energy sources, resulting in “extreme” living conditions compared to those at the surface. These conditions, challenging the existence of life forms, are further exacerbated in peculiar cave ecosystems, namely, those found in sulfidic, volcanic caves with gas emission, and ice caves. The former types have high levels of hydrogen sulphide, methane, and ammonium, while in the latter, the presence of perennial ice deposits causes constantly negative temperatures. In all these caves the apparent reduction of primary production and the lack of photosynthetic basal trophic levels in subterranean food webs constrain overall biodiversity and upper trophic levels (predators) due to food and energy shortages. Consequently, the species able to survive and reproduce have unique morphological, metabolical, physiological and ecological traits. These species, called extremophiles, are recognized as an example of “life at extremes”, being highly adapted to the environment in which they live. 

In this special issue of Frontiers in Ecology we welcome studies on biodiversity, adaptation, and evolution of biota and (meta)communities including bacteria and invertebrates from extreme subterranean environments including aquifers, sulfidic, volcanic and ice caves and springs, and lava tubes that can inform about the relationships among the composition, distribution, and diversity of species and communities and the environmental conditions. The studies should aim to document the extent and nature of evolutionary convergence across distinct lineages of organisms and determine to what degree natural selection is the driver of the extreme modifications observed in species and, finally, enhance our knowledge on life forms, to establish life limits and to understand the capacity to withstand and adapt to change.

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