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Takashi?KamiyamaEmail author Mutsumi?Tsujino Yukihiko?Matsuyama Takuji?Uchida 《Marine Biology》2005,147(4):989-997
Growth and feeding activities of the tintinnid ciliate Favella taraikaensis fed the toxic dinoflagellate Alexandrium tamarense were examined in laboratory experiments. Both growth and ingestion rates of F. taraikaensis as a function of the A. tamarense concentration were fitted to a rectangular hyperbolic equation. The maximum growth and ingestion rates of F. taraikaensis were 1.0 day–1 and 2.8 cells ind. h–1 (carbon specific ingestion rates: 3.5 day–1), respectively, which are both included in the range of previous data reported for Favella spp. feeding on other algae. The gross growth efficiency (GGE) of F. taraikaensis ranged from 0.26 to 0.49 (mean value 0.40) at the concentration of 10–800 cells ml–1, which is within the range of previous data on Favella spp. Also, the growth and ingestion rates and GGE of F. taraikaensis on A. tamarense were not significantly different from the values on another non-toxic dinoflagellate (Heterocapsa triquetra) at two different prey concentrations. This indicates that the toxicity of A. tamarense probably did not influence the feeding and growth activities of F. taraikaensis at concentrations of less than ca. 800 cells ml–1. To evaluate the grazing by F. taraikaensis on A. tamarense blooms in the field, the population dynamics of A. tamarense were simulated based on the growth and ingestion parameters of F. taraikaensis. As a result, the grazing impact by F. taraikaensis was considered to potentially regulate the development of A. tamarense blooms. If the toxicity of A. tamarense does not influence the growth and feeding activities of F. taraikaensis, the occurrence of such grazer plankton are considered to be important for predicting the course of A. tamarense bloom dynamics under natural conditions.Communicated by T. Ikeda, Hakodate 相似文献
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Amemiya Takashi Denou Masato Enomoto Hiroshi Ito Takuya Kaibe Kenji Sawada Naomi Tomari Miyuki Matsumura Yukihiko 《Environmental science and pollution research international》2021,28(37):51060-51071
Environmental Science and Pollution Research - There is an abundance of woody biomass in Japan. However, its economic feasibility is limited. There have been several discussions on whether... 相似文献
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Yukari Suzuki Lina G. Kawaguchi Dulee T. Munidasa Yukihiko Toquenaga 《Behavioral ecology and sociobiology》2009,63(9):1353-1362
We proposed “foundress-max” hypothesis that a bumble bee foundress chooses her nest site to maximize her energy intake rate
from nectar. To examine the hypothesis, we estimated the maximum energy intake rate at each site in the study area and compared
the distribution of the maximum energy intake rates with those of actual nest sites. We also calculated rank correlations
of the maximum energy intake rate with the number of nest-searching foundresses at 54 sites. The nest locations supported
the foundress-max hypothesis, but the number of nest-searching foundresses did not. This could be attributed to the density
of food sites: many food sites may attract many foundresses. Therefore, we subsequently proposed “foundress-sum” hypothesis
that a foundress chooses her nest site to maximize the sum of energy intake rates. The nest locations supported the foundress-max
hypothesis more than the foundress-sum hypothesis. A profitable food site would affect foundresses’ nest site selection. 相似文献
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Koji Inoue Hiroshi Okano Yukihiko Yamagat Katsunori Muraok Yasutake Teraoka 《环境科学学报(英文版)》2011,23(1):139-144
The adsorption/plasma decomposition with the combination of adsorption honeycomb-sheets and a plasma element is a new
technology for small-sized apparatuses to decompose volatile organic compounds (VOCs) at concentrations lower than about 100 ppm.
The feasibility of the prototype adsorption/plasma decomposition apparatus was evaluated with the simulated exhausts containing one
VOC component and with real exhausts from a painting booth and an adhesion factory. The apparatus decomposed VOCs e ectively at
the painting booth exhaust but not always satisfactorily at the adhesion factory exhaust. The performance test results with real exhausts
were discussed with respect to the concentration and discharge pattern of the exhausts and the basic properties of the system such as
cooperation of adsorption and plasma reaction and the concentration dependence of the performance. 相似文献
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