Effects of UV radiation on growth and recruitment of macroalgae: implications for vertical zonation of macroalgae across a latitudinal gradient

Updated 2002-01-25

This study will be designed to determine the response mechanisms of representative species of macrophytes along the tide flat to provide the physiological basis for answers for ecological questions, in particular how the community structure of various beds of macroalgae from the intertidal to the subtidal (eulittoral to sublittoral) region of the coastal ecosystem is affected by enhanced UV radiation. In situ measurement of photosynthetic efficiency, growth, community structure and succession will be conducted to investigate how do different species of macrophytes respond to changes in the light environment over a depth gradient and across seasons of the year. It is hypothesized that the differences in the ability to tolerate stress are the main factors controlling the distribution pattern of macrophytes. With the limited understanding in the control of tolerance, elucidating the mechanism of stress in the physiology and ecology of the organisms will allow us to quantify the impediments encountered by organisms inhabiting the tide flats. Objectives: 1. To measure the daily and seasonal variation in photosynthetically active and ultraviolet radiation. 2. To characterize the macrophyte community structure of the coastal habitat. 3. To perform UV exclusion and UV supplementation experiments in order to assess its effect on the growth of some macrophyte species in the field and in mesocosms. 4. To assess the prevention of UV damage in selected macroalgae by production of sunscreen pigments. 4. To determine the recruitment rate, recolonization pattern and succession under PAR and varying UVR condition.

Time frame

Status
Ongoing
Project time span
2001 - 2004
Data collection
not specified
Data processing
not specified
Data reporting
not specified

Contact information

Contact person
Dieter Hanelt
Address
Foundation Alfred Wegener Institute Biological Institute Helgoland Kurpromenade D-27483 Helgoland Germany
Phone
+49 4725 819 239
Fax
+49 4725 819 283
Email
ed.nevahremerb-iwa@tlenahd

Parameters and Media

Parameter groups measured/observed/modelled
Climate change effects
UV effects
Media sampled/studied/modelled
Algae (algae, phytoplankton)

Geography

Regions studied
Arctic Ocean
Biologische Anstalt Helgoland
Koldewey Station, Ny-Ă…lesund/Spitsbergen
Other areas
German Bight

Data availability

Samples/specimens archived in specimen banks?
Yes
Specimen banking information

Helgoland Herbarium

Methods & Procedures

Not specified

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
No
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