Relative importance of dust inputs and aquatic biological production as sources of lake sediments in an oligotrophic lake in a semi-arid area

Auteur(s) et Affiliation(s)



Description :
The dustfall (DF) and mass sedimentation rate (MSR) in Lake Alchichica, Central Mexico, were studied from June 2006 to June 2008. As expected, the DF in Alchichica was high and similar to that found in other arid and semi-arid areas. However, the MSR was higher than that reported for other oligotrophic lakes. In spite of the oligotrophic status of Lake Alchichica, the large size of the settled phytoplankton (autochthonous, waterborne) is what leads to the high MSR, which surpasses the DF (allochthonous, airborne) derived from whirlwinds originating in easily eroded terrains that are characteristic of arid/semi-arid areas. The results indicate that caution must be taken in considering that the DF amount measured through DF collectors located at the lake shore does actually represent the DF entering into the lake.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 3, p. 419-426, nombre de pages : 8, Références bibliographiques : 1 p.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley