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      저자 : Chihiro Katagiri (검색결과 2 건)
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      • KCI등재

        Heat coma temperature, relative contents of saturated/unsaturated fatty acids and reproductive maturation in the oceanic sea skaters Halobates micans

        Shiho Takenaka,Chihiro Katagiri,Vladimír Koštál,Tetsuo Harada 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3

        This study was performed to clarify how the relative volume of saturated/unsaturated lipid and reproductivematuration relate to resistance to high temperature in the oceanic sea skaters, Halobates micans. Heat comatemperature (HCT) was measured in H. micans adults collected from a fixed sampling location (12°00′N,135°00′E) in the western tropical Pacific Ocean. After measuring HCT, the specimen were dissected to measurethe testes size and to determine the presence and number of oocytes in females. Bodies of the specimen wereassessed by lipid analysis to evaluate saturated and unsaturated lipid content. A negative trendwas seen betweenheat coma temperature and percentage of a saturated fatty acid, myristic acid (ratio of carbon number to numberof double bonds = 14:0) (Pearson's correlation test: r = −0.520, p = 0.101). In contrast, a positive trend wasdetected between heat coma temperature and percentage of an unsaturated fatty acid, palmitoleic acid (16:1)(r = 478, p = 0.137). Young males with small testes showed lower heat coma temperatures, whereas femalesthat showed relatively high heat coma temperatures of 36–40 °C tended to have fewer mature oocytes in theirovaries than those that showed low heat coma temperatures of 30–34 °C. As Halobates appears to exhibitembryonic diapause rather than adult diapause, males of H. micans may develop both testes and resistance tohigh temperature in the parallel as they grow. In females, a trade-off may occur between heat tolerance functionand oogenesis in the oceanic sea skaters.

      • KCI등재

        Supercooling points and heat coma temperatures in four species of oceanic sea skaters of the genus Halobates (Heteroptera: Gerridae: Halobatinae)

        Tetsuo Harada,Shiho Takenaka,Kohki Iyota,Takashi Shiraki,Masatoshi Moku,Chihiro Katagiri,Vladimír Koštál 한국응용곤충학회 2013 Journal of Asia-Pacific Entomology Vol.16 No.3

        The only insects known to live in the open ocean are several species of sea skaters of the genus Halobates (Heteroptera: Gerridae). We have collected four species in the tropical western Pacific Ocean and measured heat coma temperature (HCT) and supercooling point (SCP) in 132 specimens. The SCPs were relatively low (ranging between −18 °C and −19 °C) and similar in all species. Significant inter-species differences were found in the level of HCT. The lowest HCT 32.9 °C was found in Halobates micans Eschscholtz, 1822, which is distributed in thermally stable tropical waters. The highest HCT levels of 36.6 °C and 36.0 °C were observed in Halobates sericeus Eschscholtz and Halobates germanus White, 1883, respectively, mostly occurring in thermallymore fluctuating habitats (subtropical and warm temperate waters, and coastal waters, respectively). A new species, H. sp. (under process of description) showed an intermediate HCT of 34.8 °C. In addition, we found significant negative statistical correlation between HCT and SCP values at the species and individual levels. We discuss our results in the light of putative relationship between thermal physiology of sea skaters and their distribution.

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