The Vertical Distribution and Diurnal Migration of Copepods at Different Stations in the Irish Sea

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  • アイリッシュ海のコペポーダの鉛直分布と日周移動
  • アイリッシュ海のコペポーダの鉛直分布と日周移動-1-Pseudocalanus elongatus(Boeck)とMicrocalanus pusillus G.O.sars〔英文〕
  • アイリッシュカイ ノ コペポーダ ノ エンチョク ブンプ ト ニッシュウ イド
  • I. <I>Pseudocalanus elongatus</I> (Boeck) と<I>Microcalanus pusillus</I> G. O. Sars
  • I. <I>Pseudocalanus elongatus</I> (Boeck) and<I>Microcalanus pusillus</I>G. O. Sars

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Abstract

The vertical distribution of plankton and hydrographic factors was studied at five stations within the Irish Sea, differing in depth, strength of tidal currents and location with respect to non-tidal currents. Neither the plankton nor the hydrographic factors showed vertical homogeneity at any station, even when there were strong tidal currents. The day depth of bothPseudocalanus elongatusandMicrocalanus pusillusvaried considerably at different stations and at different seasons at the same station.P. elongatusshowed diurnal migrations on some but not all occasions. No clear diurnal migration was shown by M. pusillus. Some of the vertical distributions of both species, both by day and over 24 h, could be correlated with physical or chemical factors. These included stratification involving differences in temperature or salinity, but in some cases only differences in nutrient concentration were detected. Although layers of seawater of similar density are unlikely to maintain their identity for very long periods they are probably more common than is generally realized and sufficiently persistent to have important effects on the distribution of plankton. The determination of nutrient concentrations provides a convenient and effective means of detecting such layers.

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