Publications des scientifiques de l'IRD

Lanza W. G., Acha D., Point David, Masbou J., Alanoca L., Amouroux D., Lazzaro Xavier. (2017). Association of a specific algal group with methylmercury accumulation in periphyton of a tropical high-altitude Andean lake. Archives of Environmental Contamination and Toxicology, 72 (1), p. 1-10. ISSN 0090-4341.

Titre du document
Association of a specific algal group with methylmercury accumulation in periphyton of a tropical high-altitude Andean lake
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000392305400001
Auteurs
Lanza W. G., Acha D., Point David, Masbou J., Alanoca L., Amouroux D., Lazzaro Xavier
Source
Archives of Environmental Contamination and Toxicology, 2017, 72 (1), p. 1-10 ISSN 0090-4341
Periphyton relevance for methylmercury (MeHg) production and accumulation are now well known in aquatic ecosystems. Sulfate-reducing bacteria and other microbial groups were identified as the main MeHg producers, but the effect of periphyton algae on the accumulation and transfer of MeHg to the food web remains little studied. Here we investigated the role of specific groups of algae on MeHg accumulation in the periphyton of Schoenoplectus californicus ssp. (Totora) and Myriophyllum sp. in Uru Uru, a tropical high-altitude Bolivian lake with substantial fishing and mining activities accruing around it. MeHg concentrations were most strongly related to the cell abundance of the Chlorophyte genus Oedogonium (r (2) = 0.783, p = 0.0126) and to no other specific genus despite the presence of other 34 genera identified. MeHg was also related to total chlorophyll-a (total algae) (r (2) = 0.675, p = 0.0459), but relations were more significant with chlorophyte cell numbers, chlorophyll-b (chlorophytes), and chlorophyll-c (diatoms and dinoflagellates) (r (2) = 0.72, p = 0.028, r (2) = 0.744, p = 0.0214, and r (2) = 0.766, p = 0.0161 respectively). However, Oedogonium explains most variability of chlorophytes and chlorophyll-c (r (2) = 0.856, p = < 0.001 and r (2) = 0.619, p = 0.002, respectively), suggesting it is the most influential group for MeHg accumulation and periphyton algae composition at this particular location and given time.
Plan de classement
Limnologie biologique / Océanographie biologique [034] ; Pollution [038]
Description Géographique
BOLIVIE ; ANDES ; URU URU LAC
Localisation
Fonds IRD [F B010068893]
Identifiant IRD
fdi:010068893
Contact