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- Title
Reproduction, grazing, and development of the large subarctic calanoid Eucalanus bungii: is the spring diatom bloom the key to controlling their recruitment?
- Authors
Takahashi, Kazutaka; Ide, Keiichiro
- Abstract
The response of large calanoid, Eucalanus bungii, to environmental fluctuation, particularly in relation to the spring diatom bloom in the Oyashio region, western subarctic Pacific Ocean, was examined by investigating egg production, grazing, development and starvation tolerance. Mean in situ egg production rate increased with ambient chlorophyll- a concentration, ranging from 0 to 47 eggs female d, while no diurnal synchronous spawning behavior was observed. Under the spring bloom condition, E. bungii showed prey preference for less mobile and larger-sized prey (≥30 μm ESD) and bloom-forming diatom Thalassiosira spp. accounted for >80% of ingested carbon. In the laboratory, E. bungii was successfully reared from newly hatched nauplii to adult with the diatom, Thalassiosira nordenskioldi, as a food resource. Nauplii newly hatched from eggs reached the adult stage in ca. 150 days (5°C) with a sigmoidal developmental pattern and no sexual difference in development pattern. Starvation experiments indicated that the starved copepodids (C1-C4) became more vulnerable to high temperature with the progression of developmental stage, suggesting that the post-bloom condition with low food availability and increased temperature is harsh for their copepodids. The results of this study in conjunction with previous findings suggest that E. bungii is well adapted to utilize large-sized phytoplankton, such as a bloom-forming diatoms and, therefore, their recruitment processes, including egg production, development and mortality would be strongly affected by the duration and intensity of the spring bloom.
- Subjects
PACIFIC Ocean; EUCALANUS; DIATOMS; OYASHIO Current; CHLOROPHYLL; COPEPODA
- Publication
Hydrobiologia, 2011, Vol 666, Issue 1, p99
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-010-0093-2