Why Spring ? It is the first important biological event after shipwreck Bloom of phytoplankton in the area Spawning of many species of fishes and shellfish.

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Presentation transcript:

Why Spring ? It is the first important biological event after shipwreck Bloom of phytoplankton in the area Spawning of many species of fishes and shellfish of commercial interest Effects on plankton ---- effects on food web

Source of Data Instituto Español de Oceanografia Core Project: Studies on Times Series of Oceanographic Data –Starting in 1988 in A Coruna –Several localities of study in the N-NW Coast of Spain Pelacus Cruises –Cover the area from Portugal to France OmexII Satellite Data –For the area in front of Rias Bajas Satellite chlorophyll IEO –Gijon Radial

NG SG WBB EBB Area of study

Have effects on phytoplankton been observed after the Prestige oil spill during spring? Effects on biomass (chlorophyll-a) Effects on physiology (primary production) Effects of taxonomic groups Effects on main phytoplankton species

Effects on biomass (chlorophyll-a)

Effects on primary production

Effects on diatoms

Effects on dinoflagellates

Main phytoplankton species

Effects on biomass during Pelacus Cruises Bf: Af: 2003

Effects on primary production OMEX II Box Area

Radial Gijon. Instituto Español de Oceanografia

Final Remarks No effects on phytoplankton at several levels Differences are the result of natural variabiliy of ecosystem

Why effects have not been observed?

Low solubility of Prestige fuel Low concetrations in water Low concentations in plankton Low aromatic content High density--sinking Pristane/Phytane ratio no Prestige

Plankton mechanisms remove oil from surface waters Zooplankton: grazing on oil particles –Fecal pellets sinking to bottom Diatoms: adsorption on silica wall –eventual sinking to bottom Detritus and clay particles: adsorption –Aggregates and eventual sinking

A Coruna Zooplankton: oil in the gut content

CONCLUSIONS No effects have been observed on phytoplankton during spring blooms for biomass, production and community structure We can not ascertain whether or not oil has affected phytoplankton –Large variability caused by meso and large-scale processes masks any effect –Effects reduced or short-lived. No effect on spring bloom

Acknowledgements Technical assistance –Teodoro Patrocinio Ibarrola –Jorge Lorenzo Salamanca –Leticia Viesca Lombardia Crew of R/V –IEO (Lura, Rioja, Navaz) –IFREMER (Thalassa) Projects –CICYT Aes: Reconocimiento Oceanografico en la é poca de floraci ó n primaveral en Galicia y Cant á brico –IEO: Studies on Time Series of Oceanographic Data –EU: Pelasses and Sardyn