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Seasonal switching in the nutritional requirements of Nitocra typica, a harpacticoid copepod from salt marsh aufwuchs communities
Lee, J.J.; Tietjen, J.H.; Garrison, J.R. (1976). Seasonal switching in the nutritional requirements of Nitocra typica, a harpacticoid copepod from salt marsh aufwuchs communities. Trans. Am. Microsc. Soc. 95(4): 628-637
In: Transactions of the American Microscopical Society. Blackwell Publishing: Lawrence, Kan., etc.,. ISSN 0003-0023; e-ISSN 2325-5145
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Nutritional requirements
Temporal variations > Periodic variations > Seasonal variations
Nitocra typica Boeck, 1865 [WoRMS]
Marien/Kust |
| Auteurs | | Top |
- Lee, J.J.
- Tietjen, J.H.
- Garrison, J.R.
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| Abstract |
The nutritional requirements of N.typica Boeck were studied in gnotobiotic cultures incubated at either 15 or 25°C. Both temp and food quality effected the growth rate and fecundity of the copepods. On adequate diets generation time at 15°C was 31-41 days, while at 25°C it was 13-24 days. Taken as a group, diatoms were better food sources than the chlorophytes tested. At 15°C nauplii hatched 2 days earlier from animals fed on diets of strains 709 and Bl-27 of Cylindrotheca closterium and C.fusiformis, respectively, than those raised on C.closterium (strains Bl-35 and 9), but they were less viable and matured more slowly. At 15°C the fastest maturity was reached on a diet of strain 9, but the total number of fertile female was only 17% of the number produced on a diet of strain 709. At 25°C the nutritional value of these strains was reversed. One sp of Nitzschia (Pb-7) was a good diet at both temps. Some spp of Chlamydomonas or Dunaliella were good foods at one or both temps for all the stages of the life cycle, while others were not. Phaeodactylum tricornutum and Amphora coffeaeformis acutiuscula are not good food sources. The animal has very complex and graded nutritional requirements which seem to flexibly adapt it to feed on different spp and strains of algae which are likely to occur in the community at different seasons. |
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