NDLI: Comparison of copepod collection efficiencies by three commonly used plankton nets: A case study in Bohai Sea, China

Content Provider	Springer Nature Link
Author	Chen, Hongju Yu, Hao Liu, Guangxing
Copyright Year	2016
Abstract	Selection of net with a suitable mesh size is a key concern in the quantitative assessment of zooplankton, which is crucial to understand pelagic ecosystem processes. This study compared the copepod collecting efficiency of three commonly used plankton nets, namely, the China standard coarse net (505 μm mesh), the China standard fine net (77 μm), and the WP-2 net (200 μm). The experiment was performed at six stations in the Bohai Sea during the autumn of 2012. The coarse net substantially under-sampled small individuals (body widths < 672 μm) and led to the lowest species number in each tow, whereas the fine net collected all small copepod species but failed to collect rare species. The WP-2 net appeared to be a compromise of the two other nets, collecting both small copepods and rare species. The abundance of copepods collected by the coarse net (126.4 ± 86.5 ind m$^{−3}$) was one to two orders of magnitude lower than that by the WP-2 net (5802.4 ± 2595.4 ind m$^{−3}$), and the value of the fine net (11117.0 ± 4563.41 ind m$^{−3}$) was nearly twice that of the WP-2 net. The abundance of large copepods (i.e., adult Calanus sinicus) in the three nets showed no significant differences, but the abundance of small copepods declined with decreasing mesh size. The difference in abundance resulted from the under-sampling of small copepods with body widths < 672 μm and < 266 μm by the coarse and WP-2 nets, respectively.
Starting Page	1007
Ending Page	1013
Page Count	7
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	15
Issue Number	6
e-ISSN	19935021
Language	English
Publisher	Science Press
Publisher Date	2016-09-13
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	plankton net collection efficiency copepod Bohai Sea abundance Oceanography Meteorology
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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