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The double LHPR system, a high speed micro- and macroplankton sampler
Williams, R.; Collins, N.R.; Conway, D.V.P. (1983). The double LHPR system, a high speed micro- and macroplankton sampler. Deep Sea Res. (1977) 30(3A): 331-342
In: Deep-Sea Research (1953). Pergamon: Oxford; New York. ISSN 0146-6291, more
Peer reviewed article  

Available in  Authors 

Keywords
    Phytoplankton; Plankton collecting devices; Zooplankton; Marine

Authors  Top 
  • Williams, R.
  • Collins, N.R.
  • Conway, D.V.P.

Abstract
    A double-net sampling system, consisting of two separate Longhurst-Hardy Plankton Recorders, capable of being towed at speeds up to 3 m s-1 and capturing plankton organisms such as copepod nauplii, with the minimum of damage is described. The systems are mounted in a Lowestoft sampler and connected to 53 and 280- mu m mesh nets; both nets are fitted with doors opened by a variable timer unit. The system is suitable for neritic and oceanic deployment. The ratio of the area of the net mouth to the net open area (R) for the 280- mu m net is 9 and for the 53- mu m net it is 14 to 121 depending on the nose cone used. The R values are considerably better than those of previous described systems. Examples are given showing how the instrument has been used to resolve spatially the vertical distribution of the nauplii and copepodite stages of Calanus helgolandicus.

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