NDLI: How can river-estuarine planktonic copepods survive river floods?

Content Provider	Springer Nature Link
Author	UEDA, Hiroshi TERAO, Ayumi TANAKA, Masaru HIBINO, Manabu ISLAM, Md. Shahidul
Copyright Year	2004
Abstract	Distribution of brackish-water zooplankton was surveyed in the Chikugo River estuary, Japan, at 3-h intervals for 24 h, including several hours when the river was heavily flooded because of rainfall and discharge from an upstream dam. The populations of the dominant copepods Pseudodiaptomus inopinus and Sinocalanus sinensis were concentrated in the mixing zone of the salt wedge before river flooding. During the period of flooding, they were almost completely swept out from the river, but examination of water trapped by a sediment grab sampler revealed that adults of Pseudodiaptomus inopinus were aggregated immediately above the bottom of the submerged channel outside the river mouth. After the flood, aggregations of both species appeared again in the river together with the salt wedge, and the proportion of adults in the aggregations became significantly higher than before. These results suggest that immature copepods suffer population losses through river flooding, but that the copepods can survive such flooding by means of both behavioral and reproductive mechanisms; that is, adult copepods maintain their position on the bottom of submerged channels outside the river mouth during a river flood and replace the population loss through reproduction after the flood. Channels outside river mouths are thus regarded as important topographic refuges for river-estuarine zooplankton to survive a flood.
Starting Page	625
Ending Page	632
Page Count	8
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	19
Issue Number	6
e-ISSN	14401703
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	copepods estuary river flood submerged channel survival Behavioural Sciences Ecology Evolutionary Biology Forestry Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Acknowledgements to Reviewer

List of reviewers

Reviewers list 2005

How can river-estuarine planktonic copepods survive river floods?

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