Please use this identifier to cite or link to this item:
Title: Diversity in UV sensitivity and recovery potential among bacterioneuston and bacterioplankton isolates
Author: Santos, A. L.
Lopes, S.
Baptista, I.
Henriques, I.
Gomes, N. C. M.
Almeida, A.
Correia, A.
Cunha, A.
Keywords: Bacteria
Bacteria: isolation & purification
Bacteria: radiation effects
Plankton: isolation & purification
Plankton: radiation effects
Seawater: microbiology
Ultraviolet Rays
Water Microbiology
Issue Date: Apr-2011
Publisher: Wiley-Blackwell
Abstract: Aims: To assess the variability in UV-B (280–320 nm) sensitivity of selected bacterial isolates from the surface microlayer and underlying water of the Ria de Aveiro (Portugal) estuary and their ability to recover from previous UVinduced stress. Methods and Results: Bacterial suspensions were exposed to UV-B radiation (3Æ3 W m)2). Effects on culturability and activity were assessed from colony counts and 3H-leucine incorporation rates, respectively. Among the tested isolates, wide variability in UV-B-induced inhibition of culturability (37Æ4–99Æ3%) and activity (36Æ0–98Æ0%) was observed. Incubation of UV-B-irradiated suspensions under reactivating regimes (UV-A, 3Æ65 W m)2; photosynthetic reactive radiation, 40 W m)2; dark) also revealed diversity in the extent of recovery from UV-B stress. Trends of enhanced resistance of culturability (up to 15Æ0%) and enhanced recovery in activity (up to 52Æ0%) were observed in bacterioneuston isolates. Conclusions: Bacterioneuston isolates were less sensitive and recovered more rapidly from UV-B stress than bacterioplankton isolates, showing enhanced reduction in their metabolism during the irradiation period and decreased culturability during the recovery process compared to bacterioplankton. Significance and Impact of the Study: UV exposure can affect the diversity and activity of microbial communities by selecting UV-resistant strains and alter their metabolic activity towards protective strategies.
Peer review: yes
DOI: 10.1111/j.1472-765X.2011.03011.x
ISSN: 0266-8254
Appears in Collections:CESAM - Artigos
DBio - Artigos
PT Mar - Artigos
Ria de Aveiro - Artigos

Files in This Item:
File Description SizeFormat 
Diversity in UV sensitivity.pdf903.96 kBAdobe PDFView/Open

Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.