- 著者
- Kazutaka Takahashi Hiroshi Itoh Junya Hirai Kazuaki Tadokoro Koh Nishiuchi
- 出版者
- The Plankton Society of Japan, The Japanese Association of Benthology
- 雑誌
- Plankton and Benthos Research (ISSN:18808247)
- 巻号頁・発行日
- vol.17, no.4, pp.358-368, 2022-11-30 (Released:2022-11-30)
- 参考文献数
- 31
A new species of sapphirinid copepod, Sapphirina doliolettae n. sp. was described from the Kuroshio Extension region in the western North Pacific Ocean. The new species is similar to S. nigromaculata and S. scarlata with respect to the following characteristics: 5-segmented antennule, one inner marginal process on caudal rami, and slender endopods with two apical spines on leg 4. However, it can be distinguished from these congeners by a combination of the following characteristics: the relative length of each segment of the antennule and antenna in both sexes, the width of the fourth pedigerous somite in females, the shape of the anterolateral corner of the genital somite in males and terminal process length of 3rd endopodal segment of leg 2 in males. The mitochondrial cytochrome oxidase subunit I sequences of S. doliolettae showed high interspecific variabilities from other Sapphirina species, including S. nigromaculata (20.2%) and S. scarlata (21.6–21.8%).
1 0 0 0 OA Short-term variation in the Calanus sinicus ammonium excretion rate during the post-capture period
- 著者
- Taketoshi Kodama Kazutaka Takahashi Ken-ichi Nakamura Shinji Shimode Takafumi Yamaguchi Tadafumi Ichikawa
- 出版者
- 日本プランクトン学会、日本ベントス学会
- 雑誌
- Plankton and Benthos Research (ISSN:18808247)
- 巻号頁・発行日
- vol.10, no.1, pp.75-79, 2015-03-25 (Released:2015-03-20)
- 参考文献数
- 25
- 被引用文献数
- 1 4
Short-term variation in the ammonium excretion rate by Calanus sinicus during the post-capture period was evaluated in 1-h incubations. Incubation water volume (13 mL vs. 100 mL) did not significantly affect the excretion rate, and the overall mean excretion rate of C. sinicus was similar to reported values from congeneric species. However, the 24-h variations in the excretion rate denoted that acclimation stress decreased the excretion rates 1–2 h after introduction to a no-food condition. The effect of presence/absence of food was not significant up to 24 h after capture.