Variations in the Amount of Macroplankton by Day and Night
1. Twenty oblique hauls of a stramin ring-trawl, diameter of mouth 5 feet, were made during a period of 48 hours off Liverpool, Nova Scotia, i n May, 1932. 2. The common species were Thysanoëssa mschii, Th. inermis, Sagilta elegans, Calanus finmarchicus and C. hyperboreus . 3. All of the above occur...
| Published in: | Journal of the Marine Biological Association of the United Kingdom |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
1934
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/s0025315400046634 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400046634 |
| Summary: | 1. Twenty oblique hauls of a stramin ring-trawl, diameter of mouth 5 feet, were made during a period of 48 hours off Liverpool, Nova Scotia, i n May, 1932. 2. The common species were Thysanoëssa mschii, Th. inermis, Sagilta elegans, Calanus finmarchicus and C. hyperboreus . 3. All of the above occurred in the collections made during the night n i larger numbers than in those in the daytime. No such discrepancy appeared in the case of the Fish Ova. 4. The discrepancy is held to be due in each case to a proportion of the population sinking to depths greater than could be sampled by the net. |
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