caa a22 4500 445894431 CHVBK 20180317145627.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-010-0093-2 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0093-2 Reproduction, grazing, and development of the large subarctic calanoid Eucalanus bungii [Elektronische Daten] is the spring diatom bloom the key to controlling their recruitment? [Kazutaka Takahashi, Keiichiro Ide] 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 47eggs female−1d−1, 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 (≥30μm 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. 150days (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. Springer Science+Business Media B.V., 2010 Copepoda nationallicence Egg production nationallicence Feeding nationallicence Growth nationallicence Starvation nationallicence Subarctic Pacific nationallicence Takahashi Kazutaka Tohoku National Fisheries Research Institute, 3-27-5 Shinhama-cho, 985-0001, Shiogama, Japan aut Ide Keiichiro Tohoku National Fisheries Research Institute, 3-27-5 Shinhama-cho, 985-0001, Shiogama, Japan aut Hydrobiologia Springer Netherlands 666/1(2011-05-01), 99-109 0018-8158 666:1<99 2011 666 10750 https://doi.org/10.1007/s10750-010-0093-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0093-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Takahashi Kazutaka Tohoku National Fisheries Research Institute, 3-27-5 Shinhama-cho, 985-0001, Shiogama, Japan aut NATIONALLICENCE 700 1- Ide Keiichiro Tohoku National Fisheries Research Institute, 3-27-5 Shinhama-cho, 985-0001, Shiogama, Japan aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 666/1(2011-05-01), 99-109 0018-8158 666:1<99 2011 666 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer