著者

Sotaro Fujii Koichiro Kawai Yoshihiro Sambongi Satoshi Wakai

出版者

Japanese Society of Microbial Ecology / Japanese Society of Soil Microbiology / Taiwan Society of Microbial Ecology / Japanese Society of Plant Microbe Interactions / Japanese Society for Extremophiles

雑誌

Microbes and Environments (ISSN:13426311)

巻号頁・発行日

vol.38, no.6, pp.ME23029, 2023 (Released:2023-11-08)

参考文献数

30

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To obtain a more detailed understanding of organismal acid tolerance, the larval microbiomes of 11 Chironomus species collected from acidic or neutral pH areas in Japan and reared at pH 7–8 under laboratory conditions were systematically compared using an amplicon sequencing ana­lysis. Evenness values were lower for the larval microbiomes of acid-tolerant Chironomus cf. riparius, Chironomus fusciceps, and Chironomus sulfurosus than for eight acid-sensitive species based on an alpha diversity ana­lysis. The lower evenness observed suggested a biased abundance of microorganisms, which was consistent with the identification of Chironomus species-specific microorganisms (such as Agromyces mediolanus and Comamonas odontotermitis related bacteria) with high abundance in acid-tolerant larvae. The abundance of specific microorganisms was also high in the microbiome of acid-tolerant larvae of Chironomus acerbiphilus reared at pH 4, but not in that of acid-sensitive larvae. Based on a PICRUSt2 ana­lysis, genes involved in saccharide transport were less abundant in the microbiome of acid-tolerant larvae than in that of acid-sensitive larvae, indicating nutrient-poor acidic environments. Although these results were obtained from single datasets, acid-tolerant larvae appeared to establish Chironomus species-specific interactions with microorganisms independent of saccharides, in contrast to acid-sensitive larvae. The present study is the first step towards understanding organismal acid tolerance.

著者

HIROMICHI IMABAYASHI HIDETOSHI SAITO CHIAKI OHMASA KOICHIRO KAWAI

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

BENTHOS RESEARCH (ISSN:02894548)

巻号頁・発行日

vol.1996, no.50, pp.11-17, 1996-02-15 (Released:2009-08-07)

参考文献数

20

被引用文献数

1 9

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A unique foraging behavior of the carnivorous polychaete Halla okudai (Lysaretidae) is described in detail. Living bivalves, Ruditapes philippinarum were supplied to adult H. okudai, which were burrowing in sandy sediment in aquariums. The foraging behavior was divided into 4 stages ; responding, searching, handling, and feeding. Responding and searching were considered to be dependent on the olfactory sense, and searching was significantly responsible for the variation in total foraging time. Handling was performed by inhibiting the escape of the bivalve and then opening its shell while secreting a jelly-like material. Bivalve size (23.8-26.3mm shell length) showed a significant correlation to handling time, which ranged from 0.87 to 6.67hr. During feeding, the ploychaete continued to secrete the jelly-like material, which was different in hue from that secreted during handling.