Community structure and biogeochemical impacts of microbial life on floating pumice.
JAMES ELSER; MARCELA BASTIDAS NAVARRO; JESSICA CORMAN; HILLARY EMIK; MATTHEW KELLOM; CECILIA LASPOUMADERES; ZARRAZ LEE; AMISHA PORET-PETERSON; ESTEBAN BALSEIRO; BEATRIZ MODENUTTI
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
AMER SOC MICROBIOLOGY
Lugar: Washington; Año: 2015 vol. 81 p. 1542 - 1542
Volcanic eruptions are a widespread force of geological and ecological disturbance and present recurrent opportunities for study of biological responses to novel habitat formation. However, scientific study of such events is difficult given their short duration and often distant location. Here we report results from opportunistic sampling of unique volcano-generated habitats formed during the 2011 explosive eruption in the Puyehue Cordón-Caulle complex (Chile), when massive amounts of pumice were ejected, creating novel floating substrata that have never before been characterized from a microbiological perspective. DNA sequencing revealed a dynamic community of microbes that came to inhabit the pumice with unique composition distinct from that of the lakes´ surface waters and with suggestions of ecological convergence across lakes and sampling times. Furthermore, biogeochemical studies of net nutrient fluxes showed that, while the fresh pumice arriving to the lakes was an initial source of phosphorus (P), colonized pumice had high rates of nitrogen (N) and P uptake and was sufficiently abundant to represent a significant lake-wide nutrient sink. These findings highlight the remarkable versatility of microbes in exploiting novel environments and are consistent with a recent proposal of floating pumice as a favorable environment for the initial origins of life on early Earth.