Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Bouvy Marc, Got P., Bettarel Yvan, Bouvier T., Carré Claire, Roques C., Rodier Martine, Lope J. C., Arfi Robert. (2015). Importance of predation and viral lysis for bacterial mortality in a tropical western Indian coral-reef ecosystem (Toliara, Madagascar). Marine and Freshwater Research, 66 (11), 1009-1017. ISSN 1323-1650

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1071/mf14253

Titre
Importance of predation and viral lysis for bacterial mortality in a tropical western Indian coral-reef ecosystem (Toliara, Madagascar)
Année de publication2015
Type de documentArticle référencé dans le Web of Science WOS:000365192000007
AuteursBouvy Marc, Got P., Bettarel Yvan, Bouvier T., Carré Claire, Roques C., Rodier Martine, Lope J. C., Arfi Robert.
SourceMarine and Freshwater Research, 2015, 66 (11), p. 1009-1017. ISSN 1323-1650
RésuméSize fractionation was performed using water from the Great Reef of Toliara (Madagascar) taken from two different habitats (ocean and lagoon) during the dry and wet seasons, to study the growth and mortality rates of bacterioplankton. Experiments were conducted with 1 and 100% of heterotrophic nanoflagellate (HNF) concentrations and virus-free water was obtained by tangential filtration (10kDa). During the dry season, in both environments, bacterial abundance and production were significantly lower than values recorded during the wet season. Bacterial growth rates without grazers were 0.88 day(-1) in the lagoon and 0.58 day(-1) in the ocean. However, growth rates were statistically higher without grazers and viruses (1.58 day(-1) and 1.27 day(-1)). An estimate of virus-induced bacterial mortality revealed the important role played by viruses in the lagoon (0.70 day(-1)) and the ocean (0.69 day(-1)). During the wet season, bacterial growth rates without grazers were significantly higher in both environments than were values obtained in the dry season. However, the bacterial growth rates were paradoxally lower in the absence of viruses than with viruses in both environments. Our results suggest that changes in nutrient concentrations can play an important role in the balance between viral lysis and HNF grazing in the bacterial mortality. However, virus-mediated bacterial mortality is likely to act simultaneously with nanoflagellates pressure in their effects on bacterial communities.
Plan de classementRessources halieutiques [040] ; Ecologie, systèmes aquatiques [036]
Descr. géo.MADAGASCAR ; OCEAN INDIEN ; MOZAMBIQUE CANAL ; TULEAR
LocalisationFonds IRD [F B010065514]
Identifiant IRDfdi:010065514
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010065514

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito