Feeding, metabolism, and growth of Cyclosalpa bakeri
Populations of Cyclosalpa bakeri occurred during late summer at station P in the subarctic Pacific in 1987 and 1988. Salps were collected by divers for measurement of rates of feeding, metabolism, growth, and reproduction. These parameters were used to create the first complete carbon and nitrogen b...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1992
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.556.1913 http://www.aslo.org/lo/toc/vol_37/issue_6/1236.pdf |
| Summary: | Populations of Cyclosalpa bakeri occurred during late summer at station P in the subarctic Pacific in 1987 and 1988. Salps were collected by divers for measurement of rates of feeding, metabolism, growth, and reproduction. These parameters were used to create the first complete carbon and nitrogen budget for a pelagic tunicatc. Egestion, ingestion, and filtration rates were determined from chlorophyll and pheopigment in the fecal material. Counts of diatoms in the guts indicated that pigment-based rates underestimated filtration by- 50%. Salps ranging in size from 10 to 100 mm filtered from 0.05 to 10.0 liters h I. Respiration rate was 0.22 pmol 0, (mg C)-I h-l, and NH, + excretion was 0.034 pmol (mg C) I h-l. Growth was measured on salps maintained in aquaria. A model growth curve based on size-specific rates of increase in length gave maximum growth rates of 2 % h-l and predicted a generation time of 24 d. Solitary generation salps would produce about 170 aggregate generation offspring during their lifetime, and each aggregate produces one solitary. Budgets for a 50-mm solitary salp indicate that daily rations of C and N were 6 1 and 54% of body C and N. Assimilation efficiency was 61 % for C and 71 % for N. Rates of filtration, metabolism, and growth were lower than those of some other salp species, but comparable, on a |
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