Document Detail

Physiological responses of the seagrass Posidonia oceanica as indicators of fish farm impact.
MedLine Citation:
PMID:  18334257     Owner:  NLM     Status:  MEDLINE    
The development of aquaculture along the Mediterranean coastline degrades the marine environment, in particular Posidonia oceanica meadows, which, in extreme cases, show high mortality. Here we studied the effects of organic matter and nutrient input from the effluents of three fish farms, located along the Mediterranean coast, on P. oceanica physiology. For this purpose, we measured physiological variables such as total nitrogen (N) content, free amino acid (FAA) concentration and composition, N stable isotope ratio (delta 15N), total phosphorus (P) content and total non-structural carbohydrate (TNC) content in plant tissues and epiphytes affected by organic discharges (highly impacted stations: HI, and less impacted stations: LI) and compared these results with those obtained in references sites (control stations: C). For all the descriptors analyzed in P. oceanica epiphytes, the values recorded in the vicinity of cages were, in general, much higher than those in C. Leaves did not respond consistently in any case. Total N content and delta 15N in epiphytes together with the total P content in rhizomes and epiphytes were the physiological descriptors that showed the most consistent responses to fish farm effluents. On the basis of these observations, we conclude that fish farm activities strongly affect the physiological parameters of nearby P. oceanica meadows. We propose that changes in these physiological parameters may be useful indicators of marine environmental degradation in studies that monitor the effects of fish farming.
Marta Pérez; Tania García; Olga Invers; Juan Manuel Ruiz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-03-10
Journal Detail:
Title:  Marine pollution bulletin     Volume:  56     ISSN:  0025-326X     ISO Abbreviation:  Mar. Pollut. Bull.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-05-14     Completed Date:  2008-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0260231     Medline TA:  Mar Pollut Bull     Country:  England    
Other Details:
Languages:  eng     Pagination:  869-79     Citation Subset:  IM    
Departament d'Ecologia, Universitat de Barcelona Avda. Diagonal 645, 08028 Barcelona, Spain.
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MeSH Terms
Alismatidae / metabolism*
Amino Acids / metabolism
Environmental Monitoring*
Nitrogen / metabolism
Nitrogen Isotopes / metabolism
Phosphorus / metabolism
Plant Leaves / metabolism
Plant Roots / metabolism
Rhizome / metabolism
Waste Disposal, Fluid*
Reg. No./Substance:
0/Amino Acids; 0/Nitrogen Isotopes; 7723-14-0/Phosphorus; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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