Long‐term changes in recruitment of age‐0 Pacific bluefin tuna (Thunnus orientalis) and environmental conditions around Japan          下载免费PDF全文

Yukimasa Ishida  Hiromu Fukuda  Ko Fujioka  Osamu Sakai  Yuko Hiraoka  Kazuhiro Oshima  Shuya Nakatsuka  Nobuaki Suzuki  Hiroyuki Shimada 《Fisheries Oceanography》2018,27(1):41-48

Recruitment of age‐0 Pacific bluefin tuna (Thunnus orientalis) from 1952 to 2014 was examined by a sequential regime shift detection method. The regime shifts in recruitment were detected in 1957, 1972, 1980, 1994 and 2009. The durations of regime shift ranged from 8–15 years and averaged 13.0 years. In both the total (1952–2014) and data rich (1980–2014) periods, negative relationships were found between recruitment and the Pacific Decadal Oscillation in autumn, and positive relationships were found between recruitment and sea surface temperature (SST) anomalies in the northern part of the East China Sea, in the southwestern part of the Sea of Japan, and in the waters off Shikoku and Tokai in summer and autumn. The 1994 and 2009 regime shifts in recruitment occurred in the same years as shifts in SST anomalies in the northern part of the East China Sea in summer. These results suggest that the ocean conditions in the northern part of the East China Sea are closely related to recruitment of Pacific bluefin tuna, and that the warmer conditions result in higher recruitment of the species.  相似文献   

Effect of hygrothermal treatment on wood properties: color changes and kinetic analysis using four softwood and seven hardwood species     

Miyuki U. Matsuo  Katsuya Mitsui  Isao Kobayashi  Mitsuhiro Kohara  Masato Yoshida  Hiroyuki Yamamoto 《Wood Science and Technology》2016,50(6):1145-1160

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Simultaneous selection for nutritive value and agronomic traits in timothy (Phleum pratense L.)     

Kazunori Ashikaga  Tsuneki Tanaka  Hiroki Fujii  Hiroyuki Tamaki  Koichi Sato 《Euphytica》2016,208(2):237-250

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Rhizoctonia blight of turnip green caused by Rhizoctonia solani AG-4 HG-III     

Hiroyuki Sekiguchi  Takeshi Toda  Erika Sato  Keisuke Tomioka  Hiroharu Murakami  Ryota Amemiya  Naoyuki Hirako  Masato Nakata  Mitsuro Hyakumachi  Seiya Tsushima 《Journal of General Plant Pathology》2015,81(6):454-456

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Phylogenetic study of Japanese Dickeya spp. and development of new rapid identification methods using PCR–RFLP     

Radix Suharjo  Hiroyuki Sawada  Yuichi Takikawa 《Journal of General Plant Pathology》2014,80(3):237-254

Forty-one representative Japanese Dickeya spp. (Erwinia chrysanthemi) strains isolated from 24 plants in Japan were investigated using multilocus sequence analysis of recA, dnaX, rpoD, gyrB and 16S rDNA; PCR–RFLP (restriction fragment length polymorphism) of recA, rpoD and gyrB genes; PCR genomic fingerprinting; and biochemical tests. Based on the recA, dnaX, rpoD, gyrB and 16S rDNA sequences and PCR genomic fingerprinting, the strains were essentially divided into six groups (I–VI). Group I corresponded to D. chrysanthemi, group II corresponded to D. dadantii, group III to D. dianthicola and group IV to D. zeae. Meanwhile, group V and group VI could not be assigned to any existing Dickeya species, and they were deduced to be two putative new species. The PCR–RFLP analysis of gyrB, rpoD and recA clearly differentiated the six groups of Dickeya strains. From the results of the biochemical tests, the strains were assigned to biovars 1, 3, 5, 8 and 9; only one strain (SUPP 2525) was not assignable to the existing biovars. We also showed that the PCR–RFLP analysis of rpoD, gyrB and recA can be used as a rapid technique to identify Japanese Dickeya strains.  相似文献   

Development of an adaptive marine ecosystem management and co-management plan at the Shiretoko World Natural Heritage Site     

Hiroyuki Matsuda  Mitsutaku Makino 《Biological conservation》2009,142(9):1937-1942

The Marine Management Plan for the Shiretoko World Natural Heritage Site, Japan, provides a case study for adaptive marine ecosystem management and co-management of coastal fisheries. Shiretoko was the third World Natural Heritage Site registered in Japan and earned this title because of its (i) formation of seasonal sea ice at some of the lowest latitudes in the world, (ii) high biodiversity, and (iii) many globally threatened species. The natural resource management plan of the Shiretoko site is characterized by transparency and consensus building, because (i) UNESCO and IUCN require that the plan be sustainable and (ii) the Government of Japan has guaranteed local fisheries that there will be no additional regulations included in the plan. The Marine Management Plan describes which species and factors are monitored, how these data are evaluated, and how the benchmarks specified by ecosystem management are determined. The plan will provide a valuable example for the establishment of “environment-friendly fisheries” in Japan and other countries, because it includes voluntary activities by resource users that are suitable for use in a local context, flexible to ecological/social fluctuations, and efficiently implemented through increased legitimacy and compliance. This approach is appropriate for coastal communities where a large number of small-scale fishers catch a variety of species using various types of gear. We develop a method to evaluate fisheries integrity by-catch and yield data.  相似文献   

Mercury distribution in tephra soil layers in Hokkaido, Japan, with reference to 34,000-year stratification     

Satoru HOBARA  Naoharu MIZUNO  Yoji AMANO  Hiroshi YOKOTA  Hiroyuki TANIYAMA 《Soil Science and Plant Nutrition》2009,55(4):582-589

Tephra from volcanic eruptions contains only small amounts of mercury (Hg) right after the eruption because the high temperature at eruption evaporates Hg in volcanic ash. Thus, accumulation of Hg in tephra soil layers during the dormant periods of the volcano may reflect Hg deposition while the layer was exposed to the atmosphere. To estimate sequential changes in Hg deposition, we measured the Hg content and accumulation in tephra layers from 6 sites in Hokkaido known to have many tephra layers derived from volcanic eruptions over a 34,000-year period. Mercury content and accumulation rate in the soil profiles varied widely depending on the tephra. In each tephra layer, the Hg content and accumulation rates increased principally at the upper soil horizons and decreased at the lower depths. The Hg deposition rates calculated from the amount of Hg accumulated in the tephra layers were similar within the same tephra. These characteristics of Hg distribution indicate that Hg deposition accumulated on the surface of each tephra layer during the period the tephra layer was exposed to the atmosphere. Although physicochemical processes such as leaching out, wind erosion, and volatilization might lead to over- and/or underestimation of the deposition rates, our estimated amounts of Hg were markedly higher in the tephra soils after 1,600 year BP than before that time. The results of this study suggest that tephra layers in Hokkaido offer important implications for understanding of the historical changes in atmospheric Hg deposition.  相似文献   

Novel SNP in 5' flanking region of EDG1 associated with marbling in Japanese Black beef cattle     

Takahisa YAMADA  Seiki SASAKI  Shin SUKEGAWA  Takeshi MIYAKE  Tatsuo FUJITA  Hiroyuki KOSE  Mitsuo MORITA  Youichi TAKAHAGI  Hiroshi MURAKAMI  Fumiki MORIMATSU  Yoshiyuki SASAKI 《Animal Science Journal》2009,80(4):486-489

Marbling, defined by the amount and distribution of intramuscular fat, is an economically important trait of beef cattle in Japan. The endothelial differentiation , sphingolipid G-protein-coupled receptor , 1 ( EDG1 ) gene has been considered as a positional functional candidate for the gene responsible for marbling. We have recently reported that 2 single nucleotide polymorphisms (SNPs), c.-312A > G in the 5' untranslated region (UTR) and c.*446G > A in the 3' UTR in EDG1 were associated with marbling in Japanese Black beef cattle, but this was not functional and a causal mutation for marbling. In the present study, we detected 2 novel SNPs, referred to as g.1475435G > A and g.1471620G > T , in the 5' flanking region of the EDG1 between low-marbled and high-marbled steer groups, which were previously shown to have EDG1 expression differences in musculus longissimus muscle. The g.1475435G > A SNP seemed not to segregate in Japanese Black beef cattle. The g.1471620G > T SNP was associated with the predicted breeding value for beef marbling standard number by the analyses using Japanese Black beef cattle population. Based on these findings, we hypothesized that the g.1471620G > T SNP might have an impact on EDG1 expression and also marbling.  相似文献   

Deformation induced by ethanol substitution in normal and tension wood of chestnut (Castanea sativa Mill.) and simarouba (Simarouba amara Aubl.)     

Shan Shan Chang  Bruno Clair  Joseph Gril  Hiroyuki Yamamoto  Françoise Quignard 《Wood Science and Technology》2009,43(7-8):703-712

Wood deformation in the longitudinal and tangential directions induced by ethanol substitution and oven-drying was measured in normal wood (NW) and tension wood (TW) of chestnut (Castanea sativa Mill.) (TW with G-fibres) and simarouba (Simarouba amara Aubl.) (TW without G-fibres). The results show that with increased concentration of ethanol solution TW tends to contract, regardless of the presence or absence of G-fibres. In contrast, both NW and opposite wood expand at different rates in the longitudinal direction. These results are discussed and explained by the role of stress state at cell wall level.  相似文献   

Effect of feeding rotifers enriched with taurine on the growth and survival of larval amberjack Seriola dumerili     

Hiroyuki Matsunari  Hiroshi Hashimoto  Takashi Iwasaki  Kentaro Oda  Yoshitsugu Masuda  Hitoshi Imaizumi  Kazuhisa Teruya  Hirofumi Furuita  Takeshi Yamamoto  Kazuhisa Hamada  Keiichi Mushiake 《Fisheries Science》2013,79(5):815-821

The effect of feeding rotifers enriched with taurine on the growth performance and survival of larval amberjack Seriola dumerili was investigated. Rotifers were enriched with a commercial taurine supplement at four levels (0, 200, 400, and 800 mg/l). The larvae were fed the enriched rotifers in triplicate from 3 days post-hatch for 7 days under static conditions. The average taurine contents of the rotifers were 1.5, 2.7, 4.2, and 7.2 mg/g dry matter, respectively. The growth of the fish fed rotifers enriched with the taurine supplement at 800 mg/l was significantly (P < 0.05) improved compared with that of the fish fed the rotifers without taurine enrichment. The survival rate improved proportionally up to a taurine supplement level of 400 mg/l, but no significant differences in survival were observed among treatments. The fraction of the larvae with inflated swim bladders did not vary significantly between treatments. Taurine content in the whole fish body increased with the taurine level in the rotifers. These results suggest that taurine enrichment of rotifers is an effective method of enhancing the growth of amberjack larvae.  相似文献