NDLI: Seasonal variations in abundance, growth and mortality of heterotrophic bacteria in Kagoshima Bay

Content Provider	Springer Nature Link
Author	Kobari, Toru Fujii, Tomo Kobari, Yurie Haba, Akimasa
Copyright Year	2010
Abstract	Seasonal changes in abundance, growth and mortality of heterotrophic bacteria were investigated monthly from collections and dilution experiments in Kagoshima Bay, the southernmost of Japan. Bacteria occurred abundantly with considerable variation in the surface layers where chlorophyll a concentrations were high, whereas seasonal variations were obscure below 100 m. Especially, bacteria showed a decline of cell density toward summer when heterotrophic nano-flagellates increased their abundance. Seasonal and vertical variations in bacterial cell number during the study period were positively correlated with those of water temperature and pico-sized chlorophyll a concentration. Maximum growth and mortality rates showed positive correlations with water temperature but no positive relationships to size-fractionated chlorophyll a. Net increase rate (i.e. in situ rate if abundance changes) was negatively correlated with cell density of heterotrophic nano-flagellates. It is concluded that bacterial abundance is controlled by the resultant (i.e. net growth rate) of the balance between maximum growth and predatory mortality by heterotrophic nano-flagelllates which are both dependent on ambient temperature.
Starting Page	845
Ending Page	853
Page Count	9
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	66
Issue Number	6
e-ISSN	1573868X
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-01-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Seasonal change heterotrophic bacteria abundance growth mortality Kagoshima Bay Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

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