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Occurrence of Vibrio parahaemolyticus and Vibrio alginolyticus in the German Bight over a seasonal cycle
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Occurrence of Vibrio parahaemolyticus and Vibrio alginolyticus in the German Bight over a seasonal cycle
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Journal Article
Occurrence of Vibrio parahaemolyticus and Vibrio alginolyticus in the German Bight over a seasonal cycle
2011
Overview
Bacteria of the genus
Vibrio
are an important component of marine ecosystems worldwide. The genus harbors several human pathogens, for instance the species
Vibrio parahaemolyticus
, a main cause for foodborne gastroenteritis in Asia and the USA. Pathogenic
V. parahaemolyticus
strains emerged also in Europe, but little is known about the abundance, pathogenicity and ecology of
V. parahaemolyticus
especially in Northern European waters. This study focuses on
V. parahaemolyticus
and its close relative
Vibrio alginolyticus
in the North Sea (Helgoland Roads, Germany). Free-living, plankton-attached and shellfish-associated
Vibrio
spp. were quantified between May 2008 and January 2010. CFUs up to 4.3 × 10
3
N l
−1
and MPNs up to 240 N g
−1
were determined. Phylogenetic classification based on
rpoB
gene sequencing revealed
V. alginolyticus
as the dominant
Vibrio
species at Helgoland Roads, followed by
V. parahaemolyticus
. We investigated the intraspecific diversity of
V. parahaemolyticus
and
V. alginolyticus
using ERIC-PCR. The fingerprinting disclosed three distinct groups at Helgoland Roads, representing
V. parahaemolyticus
,
V. alginolyticus
and one group in between. The species
V. parahaemolyticus
occurred mainly in summer months. None of the strains carried the virulence-associated genes
tdh
or
trh
. We further analyzed the influence of nutrients, secchi depth, temperature, salinity, chlorophyll a and phytoplankton on the abundance of
Vibrio
spp. and the population structure of
V. parahaemolyticus
. Spearman Rank analysis revealed that particularly temperature correlated significantly with
Vibrio
spp. numbers. Based on multivariate statistical analyses we report that the
V. parahaemolyticus
population was structured by a complex combination of environmental parameters. To further investigate these influences is the key to understanding the dynamics of
Vibrio
spp. in temperate European waters, where this microbial group and especially the pathogenic species, are likely to gain in importance.
Publisher
Springer Netherlands,Springer,Springer Nature B.V
Subject
Aeromonas hydrophila - drug effects
/ Aeromonas hydrophila - genetics
/ Aeromonas hydrophila - isolation & purification
/ Aeromonas hydrophila - physiology
/ Animals
/ Bacteria
/ Biological and medical sciences
/ Biomedical and Life Sciences
/ Fundamental and applied biological sciences. Psychology
/ Genomics
/ Genotype
/ Germany
/ Harbors
/ Mytilus edulis - microbiology
/ Plankton
/ Roads
/ Seasons
/ Vibrio alginolyticus - classification
/ Vibrio alginolyticus - genetics
/ Vibrio alginolyticus - growth & development
/ Vibrio alginolyticus - isolation & purification
/ Vibrio parahaemolyticus - classification
/ Vibrio parahaemolyticus - genetics
/ Vibrio parahaemolyticus - growth & development
