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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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Epibiosis of Calpensia nobilis (Esper) (Bryozoa: Cheilostomida) on Posidonia oceanica (L.) Delile rhizomes: Effects on borer colonization and morpho-chronological features of the plant Cigliano, M.; Cocito, S.; Gambi, M.C. (2007). Epibiosis of Calpensia nobilis (Esper) (Bryozoa: Cheilostomida) on Posidonia oceanica (L.) Delile rhizomes: Effects on borer colonization and morpho-chronological features of the plant. Aquat. Bot. 86(1): 30-36. https://dx.doi.org/10.1016/j.aquabot.2006.08.006 In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770; e-ISSN 1879-1522, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 353063 [ aanvragen ]

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Trefwoorden

Aquatic organisms > Boring organisms Bryozoa [WoRMS]; Calpensia nobilis (Esper, 1796) [WoRMS]; Polychaeta [WoRMS]; Posidonia oceanica (Linnaeus) Delile, 1813 [WoRMS] MED, Mediterranean [Marine Regions] Marien/Kust

Author keywords

Posidonia oceanica; bryozoan; Calpensia nobilis; polychaete; borer;lepidochronology; Mediterranean sea

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Auteurs		Top
Cigliano, M. Cocito, S. Gambi, M.C., meer

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Abstract

Shoots of the Mediterranean seagrass Posidonia oceanica (L.) Delile can be overgrown with a thick encrustation of the bryozoan Calpensia nobilis (Esper) (Chelostomida) particularly under high hydrodynamic conditions. We compared shoots with and without this encrustation and assessed whether it affected shoot morphology and production, and incidence of polychaete borers. The borers collected were represented by three species of polychaete Eunicidae (Lysidice ninetta, Lysidice collaris and Nematonereis unicornis). Shoots affected by overgrowth of C. nobilis showed a significantly lower borer frequency (17% versus 49%), lower values of both yearly biomass of the rhizome (mean 6.3 mg/year in shoot with C. nobilis versus 8.3 mg/year in shoot without) and biomass/elongation (B/E) ratio, and lower mean sheath thickness (0.25 mm versus 0.30 mm), while the mean width of the leaves was slightly higher (1.0 mm versus 0.7 mm). Significant Spearman coefficient's values were estimated between carbonate mass of C. nobilis and rhizome length, muff length and rhizome length, and maximum thickness of the muff and rhizome length. Plant and bryozoan morphometrics allowed to estimate between 5 and 10 years the colonization age of C. nobilis on the living shoots studied.

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