Chemical Defense Against Fouling in the Solitary Ascidian Phallusia nigra

The solitary ascidian Phallusia nigra is rarely fouled by epibionts. Here, we tested the antifouling activity of its crude extracts in laboratory and field assays. P. nigra extracts inhibited the growth of all eight tested environmental bacteria and two of four laboratory bacteria. Extracts of the s...

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Bibliographic Details
Published in:The Biological bulletin (Lancaster) 2014-12, Vol.227 (3), p.232-241
Main Authors: MAYZEL, BOAZ, HABER, MARKUS, ILAN, MICHA
Format: Article
Language:English
Subjects:
Algae
Animals
Antifouling
Artemia salina
Ascidiacea
Bacteria
Bacteria - drug effects
Bioassay
Biological assay
Brines
Bugula neritina
Decapoda
ECOLOGY AND EVOLUTION
Fouling
Gels
Health aspects
Herdmania momus
Hydrogen-Ion Concentration
Invertebrates - drug effects
Larva - drug effects
Larvae
Larval development
Lethal Dose 50
Marine
Metabolites
Metamorphosis, Biological - drug effects
Methods
Phallusia nigra
Proteobacteria
Scanning electron microscopy
Sea squirts
Sea water
Shellfish
Tissue Extracts - pharmacology
Tissues
Tunicates
Urochordata - chemistry
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Summary:The solitary ascidian Phallusia nigra is rarely fouled by epibionts. Here, we tested the antifouling activity of its crude extracts in laboratory and field assays. P. nigra extracts inhibited the growth of all eight tested environmental bacteria and two of four laboratory bacteria. Extracts of the sympatric, but fouled solitary ascidian Herdmania momus inhibited only one test bacterium. Scanning electron microscopy confirmed that the tunic surface of P. nigra is largely bacteria-free. Both ascidian extracts significantly inhibited the larval metamorphosis of the bryozoan Bugula neritina at the tested concentration range of 0.05–2 mg ml-1. Both crude extracts were toxic to larvae of the brine shrimp Artemia salina at natural volumetric whole-tissue concentrations, but only P. nigra showed activity at 2 mg ml-1 and below (LC50 = 1.11 mg ml-1). P. nigra crude extracts also significantly reduced the settlement of barnacles, polychaetes, and algae in Mediterranean field assays and barnacle settlement in Red Sea trials. Comparisons between control experiments and pH values monitored in all experiments indicate that the observed effects were not due to acidity of the organic extracts. Our results show that P. nigra secondary metabolites have antifouling activities, which may act in synergy with previously proposed physiological antifouling mechanisms.
ISSN:0006-3185
1939-8697
DOI:10.1086/BBLv227n3p232