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Biodiversity and Valorisation of blue Diatoms

Objectif

This program aims to increase our knowledge about the biology and biodiversity of ‘blue diatoms’, unique among microalgae by their ability to produce specific water-soluble bluish pigments. Up to now the terms ‘blue diatoms’ have referred exclusively to the pennate marine diatom Haslea ostrearia, and to its blue pigment, the so-called marennine, a polyphenolic molecule with biological activities, which is produced during algal growth and ageing. In oyster ponds of western France, H. ostrearia may year on year become dominant, and marennine released in the seawater is responsible for the ’greening’ of oysters, a phenomenon which has a noticeable local economical impact. The diatom H. ostrearia has long been considered the only microalga ever known, worldwide in distribution, to produce marennine. Indeed in the literature, diatoms with blue tips described as H. ostrearia were reported in almost all seas and oceans in northern and southern hemispheres. Their presence was deduced either directly from the observation of living cells, or indirectly from a greening effect of bivalves. In most cases, a careful identification of the ‘blue diatoms’ at the species level did not rely on detailed studies of morphology and morphometrics. This paradigm has been recently questioned following the discovery, in phytoplanktonic samples taken on rocky shores of Crimea (Ukraine), of diatoms presenting similarities with H. ostrearia, with bluish apices, but in which the pigment seemed different from marennine. Preliminary results indicate that these diatoms could be two different species, which raises a concern about occurrences of ‘blue diatoms’ and their identification as H. ostrearia in all other marine environments. Hence the present project is aiming to deepen our knowledge of the biology, physiology and pigments of ‘blue diatoms’, to study their biodiversity, and to unravel their taxonomy, especially regarding the genus Haslea.

Appel à propositions

FP7-PEOPLE-2010-IRSES
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Régime de financement

MC-IRSES - International research staff exchange scheme (IRSES)

Coordinateur

UNIVERSITE DU MANS
Adresse
Avenue Olivier Messiaen
72085 Le Mans
France
Type d’activité
Higher or Secondary Education Establishments
Contribution de l’UE
€ 100 400
Contact administratif
Laetitia Pennuen (Ms.)

Participants (5)

UNIVERSITE DE NANTES
France
Contribution de l’UE
€ 46 200
Adresse
Quai De Tourville 1
44035 Nantes Cedex 1
Type d’activité
Higher or Secondary Education Establishments
Contact administratif
Elodie Hervio (Ms.)
UNIVERSITE DE BRETAGNE SUD
France
Contribution de l’UE
€ 4 200
Adresse
Rue Armand Guillemot 27
56100 Lorient
Type d’activité
Higher or Secondary Education Establishments
Contact administratif
Audrey Maffessoli (Ms.)
LA ROCHELLE UNIVERSITE
France
Contribution de l’UE
€ 10 500
Adresse
Avenue Albert-einstein 23
17031 La Rochelle
Type d’activité
Higher or Secondary Education Establishments
Contact administratif
Lucia Picard (Mrs.)
CARDIFF UNIVERSITY
United Kingdom
Contribution de l’UE
€ 16 800
Adresse
Newport Road 30-36
CF24 ODE Cardiff
Type d’activité
Higher or Secondary Education Establishments
Contact administratif
Nick Bodycombe (Mr.)
PANEPISTIMIO KRITIS
Greece
Contribution de l’UE
€ 8 400
Adresse
University Campus Gallos
74100 Rethimno
Type d’activité
Higher or Secondary Education Establishments
Contact administratif
Panayota Spetsidou (Mrs.)