Growth rate of Ulva rigida in different Mediterranean eutrophicated sites

The growth of juvenile populations of Ulva rigida C. Agardh was measured by means of immersion in in situ cages against environmental parameters (temperature, incident light, salinity, dissolved inorganic nitrogen and dissolved reactive phosphorus) in four different eutrophicated southern sites: Cha...

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Bibliographic Details
Published in:Bioresource technology 2002-03, Vol.82 (1), p.27-31
Main Authors: de Casabianca, M.-L, Barthelemy, N, Serrano, O, Sfriso, A
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
cages
Chlorophyta - growth & development
Chlorophyta - physiology
dissolved inorganic nitrogen
Ecotoxicology, biological effects of pollution
environmental factors
Eutrophication - physiology
Fundamental and applied biological sciences. Psychology
grazing
juveniles
Light
Marine and brackish environment
Mediterranean Sea
Nitrogen - metabolism
phosphorus
Phosphorus - metabolism
salinity
seasonal variation
Seasons
Temperature
Ulva
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Summary:The growth of juvenile populations of Ulva rigida C. Agardh was measured by means of immersion in in situ cages against environmental parameters (temperature, incident light, salinity, dissolved inorganic nitrogen and dissolved reactive phosphorus) in four different eutrophicated southern sites: Channel of the Thau lagoon (France), Lido, Sacca Sessola and Fusina stations (Venice lagoon, Italy). The growth curves as a function of temperature showed that, in all cases, the maximal temperature for Ulva growth was 17 °C (limitation in growth below 7 °C and above around 25 °C). The growth analysis of these four sites showed seasonal differences. In the least eutrophicated and calmest Lido station, grazing and dissolved reactive phosphorus (seven times lower at Lido than at Thau) played a key role. At Thau and Fusina, which are eutrophicated and turbid environments, the incident light had a strong impact on growth. Sacca Sessola, with an intermediate position between the above two mentioned situations, showed the highest growth rate. The values and relative growth rate (RGR) curves of the Mediterranean and open-sea northern sites are discussed. In particular, the temperature defines the type of growth curve (unimodal or bimodal) and the incident light is responsible for the low Mediterranean RGR values (
ISSN:0960-8524
1873-2976
DOI:10.1016/S0960-8524(01)00155-9