Photoreactivity of Dissolved Organic Matter from High-Mountain Lakes of Sierra Nevada, Spain

2001 ◽  
Vol 33 (4) ◽  
pp. 426 ◽  
Author(s):  
I. Reche ◽  
E. Pulido-Villena ◽  
J. M. Conde-Porcuna ◽  
P. Carrillo
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Sierra Nevada ◽  
Mountain Lakes ◽  
High Mountain ◽  
High Mountain Lakes

Food web reliance on allochthonous carbon in two high mountain lakes with contrasting catchments: a stable isotope approach

2005 ◽  
Vol 62 (11) ◽  
pp. 2640-2648 ◽  
Author(s):  
Elvira Pulido-Villena ◽  
Isabel Reche ◽  
Rafael Morales-Baquero
Keyword(s):  
Organic Matter ◽  
Food Web ◽  
Particulate Organic Matter ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Isotopic Signature ◽  
Mountain Lakes ◽  
High Mountain ◽  
Terrestrial Carbon ◽  
High Mountain Lakes

The carbon isotopic signature (δ13C) of dissolved inorganic carbon and food web components was examined in two high mountain lakes. Río Seco Lake is partially surrounded by alpine meadows and has temporal inlets, whereas La Caldera Lake is located on rocky terrain and does not receive inputs from runoff. We assessed whether these contrasting catchments involve differences in the isotopic signature of the food web components and then in the reliance on terrestrial carbon. The δ13C of dissolved inorganic carbon was not significantly different between lakes and reflected an atmospheric gas exchange origin. Unexpectedly, bulk particulate organic matter showed enriched δ13C values in both lakes, suggesting a terrestrial vegetation influence. Bulk particulate organic matter was exploited mostly by the cladoceran Daphnia pulicaria, whereas the copepod Mixodiaptomus laciniatus was 13C depleted relative to particulate organic matter, indicating a selective feeding on an isotopically lighter source, likely phytoplankton. The results obtained show that, despite contrasting catchments, the food web of both lakes might be partially supported by terrestrial carbon for which utilization is species specific.

Nitrogen-phosphorus relationship in high mountain lakes: effects of the size of catchment basins

1999 ◽  
Vol 56 (10) ◽  
pp. 1809-1817 ◽  
Author(s):  
Rafael Morales-Baquero ◽  
Presentación Carrillo ◽  
Isabel Reche ◽  
Pedro Sánchez-Castillo
Keyword(s):  
Chlorophyll A ◽  
Sierra Nevada ◽  
Inorganic Nitrogen ◽  
Soluble Reactive Phosphorus ◽  
Mountain Lakes ◽  
Saharan Dust ◽  
High Mountain ◽  
High Mountain Lakes ◽  
Small Catchment ◽  
Catchment Areas

We analyzed the changes in epilimnetic total nitrogen (TN), total phosphorus (TP), dissolved inorganic nitrogen (DIN), and soluble reactive phosphorus (SRP) in 31 small high-mountain lakes in the Sierra Nevada (Spain) during an annual cycle, just after the spring thaw, and in the middle of the growing season. Chlorophyll a, TN, and TP increased, whereas the TN:TP ratio fell substantially between the two periods, reaching values generally between 25 and 10 (by weight). On the contrary, DIN, SRP, and DIN:SRP ratios were similar for both periods in each lake. DIN:SRP ratios generally ranged from 5 to 20 (by weight). This ratio was low in the lakes with small catchment areas and increased progressively with catchment basin size. A regression analysis for the smallest catchments showed that chlorophyll a concentrations were not accounted for by variability in TP concentration. The results obtained are discussed in relation to the influence of episodes of Saharan dust, rich in P, reaching the Southern Mediterranean area.

Patterns in the composition of the rotifer communities from high mountain lakes and ponds in Sierra Nevada (Spain)

Hydrobiologia ◽  
1989 ◽  
Vol 186-187 (1) ◽  
pp. 215-221 ◽  
Author(s):  
R. Morales-Baquero ◽  
L. Cruz-Pizarro ◽  
P. Carrillo
Keyword(s):  
Sierra Nevada ◽  
Mountain Lakes ◽  
High Mountain ◽  
High Mountain Lakes ◽  
Rotifer Communities
Sign in / Sign up

Export Citation Format

Share Document