Physiological response of growth, photosynthesis and nutrient uptake of marine macrophytes in a UV- and CO2 - enriched environment

Updated 2003-01-29

As a result of the increasing atmospheric CO2 levels and other greenhose gases due to anthropogenic activities, global and water temperature is rising. The objectives of our project might be summarized as follows: I. To measure the activity of the enzymatic systems involved in carbon, nitrogen and phosphorus uptake (carbonic anhydrase, nitrate reductase and alkaline phosphatase) in selected macroalgae. To assess the optimal concentration of inorganic nitrogen and phosphorus for growth and photosynthesis. To study the total concentration of carbon and nitrogen metabolites in the macroalgae (proteins, total carbohydrates, and lipids) in order to define the possible existence of nutrient limitation. II. To simulate the conditions of climate change, represented as CO2 enrichment and increasing UV radiation, on the activity of carbon, nitrogen and phosphorus uptake mechanisms. III. To screen the activity of the enzymatic systems previously detailed in macroalgae from the Konjsfjord, in order to know their nutritional state.

Time frame

Project time span
2002 - 2002
Data collection
2002 - 2002
Data processing
2002 - 2003
Data reporting
2002 - 2003

Contact information

Contact person
Carlos Jimenez
Department of Ecology Faculty of Sciences University of Malaga Campus Universitario de Teatinos 29071-Malaga Spain
+34 952 134 134
+34 952 132 000

Parameters and Media

Parameter groups measured/observed/modelled
Biological effects
Climate change effects
UV effects
Media sampled/studied/modelled
Algae (algae, phytoplankton)
Additional information or further specification of types of data / information collected, species / tissues / organs sampled, etc.

Several species of macroalgae have been collected, and the effect of increasing nutrient (N and P) concentration, CO2 and UV on growth, photosynthesis and nutrient uptake rates studied.


Regions studied
UV effects
UV effects
UV effects

Data availability

Samples/specimens archived in specimen banks?

Methods & Procedures

Procedures and methodology used for, e.g., sampling and sample storage, sample pretreatment, extraction and analysis, including which laboratories are involved, references to methods employed, etc.

Samples were harvested by scuba-diving. Algal discs were cut from the thalli, and incubated in seawater supplemented with different N and P concentrations. Treatments also included presence or absence of UV radiation, and high and low levels of CO2. Samples were withdrawn at prefixed times (during 10-15 days), and in situ analyzed for growth (by weight and size increase of the algal discs), photosynthesis (fluorescence measurements) and enzyme activities related to C (carbonic anhydrase), N (nitrate reductase) and P (alkaline phosphatase) uptake. Water samples were also collected to estimate nutrient concentration). Algal discs were also harvested and frozen to study proximal composition (carbohydrate, protein, lipids), pigment concentration, and internal nutrient (nitrate and phosphate) concentration.

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
Please log in to edit this record