PERSONAL DE APOYO
BUSTINGORRY Jose Fernando
artículos
Título:
Microbial pelagic metabolism and CDOM
Autor/es:
A. TORREMORELL; G. PÉREZ; L. LAGOMARSINO; P. HUBER; C. QUEIMALIÑOS; J. BUSTINGORRY; P. FERMANI; M. E. LLAMES; F. UNREIN
Revista:
HYDROBIOLOGIA
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2014 vol. 740
ISSN:
0018-8158
Resumen:
Dominant primary producer in macrophyte-
or phytoplankton-dominated shallow lakes
might imply differences in dissolved organic carbon
(DOC) composition. We compared chromophoric
dissolved organic matter (CDOM), plankton respiration
(R), and bacterial (BP) and primary production
(PP), in two contrasting shallow lakes. We hypothesized
that DOC from the macrophyte-dominated
lake would be qualitatively inferior, so that it can
support a lower yield than DOC from the phytoplankton-
dominated one. Macrophyte-dominated lake
had more humic and aromatic CDOM, though
molecular weight was similar in both lakes. A clear
synchronism between lakes was observed in mean
depth and several CDOM absorption coefficients,
suggesting an external driver of the variation in DOC
concentration and CDOM quality. The positive BPPP
and BP-Chl-a correlations in the macrophytedominated
lake point out to a dependence of bacteria
on phytoplankton for a supply of labile DOC. In turn,
BP in the phytoplankton-dominated lake was balanced
with grazing by HF (heterotrophic flagellates).
The significantly higher HB:DOC and HF:DOC
carbon ratios in the phytoplankton-dominated lake
also suggest that better DOC quality would mean
relatively more efficient C transfer to higher trophic
levels. According to PP:BP and PP:R ratios both
lakes should be considered autotrophic, although the
macrophyte-dominated lake would be comparatively
more heterotrophic.