Organic contaminants deposited on glacier snow and ice are subject to partitioning and degradation processes that determine their environmental fate and, consequently, their accumulation in ice bodies. Among these processes, organic compound degradation by supraglacial bacteria has been investigated to a lesser extent than photo- and chemical degradation. We investigated biodegradation of the organophosphorus insecticide chlorpyrifos (CPF), a xenobiotic tracer that accumulates on glaciers after atmospheric medium- and long-range transport, by installing in situ microcosms on an Alpine glacier to simulate cryoconite hole systems. We found that biodegradation contributed to the removal of CPF from the glacier surface more than photo- and chemical degradation. The high concentration of CPF (2â3 Î¼g gâ1 w.w.) detected in cryoconite holes and the estimated half-life of this compound (35â69 days in glacier environment) indicated that biodegradation can significantly reduce CPF concentrations on glaciers and its runoff to downstream ecosystems. The metabolic versatility of cryoconite bacteria suggests that these habitats might contribute to the degradation of a wide class of pollutants. We therefore propose that cryoconite acts as a âbiofilterâ by accumulating both pollutants and biodegradative microbial communities. The contribution of cryoconite to the removal of organic pollutants should be included in models predicting the environmental fate of these compounds in cold areas.
Bacteria contribute to pesticide degradation in cryoconite holes in an Alpine glacier / C. Ferrario, F. Pittino, I. Tagliaferri, I. Gandolfi, G. Bestetti, R.S. Azzoni, G. Diolaiuti, A. Franzetti, R. Ambrosini, S. Villa. - In: ENVIRONMENTAL POLLUTION. - ISSN 0269-7491. - 230(2017), pp. 919-926.
|Titolo:||Bacteria contribute to pesticide degradation in cryoconite holes in an Alpine glacier|
|Parole Chiave:||Biodegradation; Burkholderiales; Chlorpyrifos; Microcosms; Toxicology; Pollution; Health, Toxicology and Mutagenesis|
|Settore Scientifico Disciplinare:||Settore BIO/07 - Ecologia|
Settore BIO/19 - Microbiologia Generale
Settore GEO/04 - Geografia Fisica e Geomorfologia
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.envpol.2017.07.039|
|Appare nelle tipologie:||01 - Articolo su periodico|