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Volume 63 (2012)
- Issue 4 Pages 245-
- Issue 3 Pages 195-
- Issue 2 Pages 95-
- Issue 1 Pages 1-
Volume 63, Issue 2
Displaying 1-5 of 5 articles from this issue
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Original Articles
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Yoshio TSUDA2012 Volume 63 Issue 2 Pages 95-101
Published: June 30, 2012
Released on J-STAGE: July 06, 2013
JOURNAL FREE ACCESSMosquito larvae occurred in catch basins in an urban park in Tokyo, Japan were collected by dipping in 3 consecutive mosquito seasons from May 2003 to December 2005. A total of 90 catch basins in the park were examined monthly, except for winter seasons, and presence of water in each catch basin was recorded. During the whole study period 16,452 larvae of 6 species in 4 genera were collected and the following 4 species were dominant; Culex pipien pallens, Aedes albopictus, Cx. sasai and Lutzia vorax. The presence/absence of water in catch basin showed a clear seasonal changes and the water retention rate was defined for each catch basin as a percentage of the number of observations with standing water to the total number of observations. Catch basins with >60% water retention rate composed of 24.4% of the total catch basins examined in this study. There was a significant positive correlation between the water retention rate and the mean density of larvae for Cx. pipiens pallens, Cx. sasai and Lt. vorax. Disproportionate production of mosquito larvae was found among catch basins with different water retention rate and the catch basins with >60% water retention rate contributed >80% of the total production of larvae.View full abstractDownload PDF (747K) -
Mizuho SHIMADA, Satoru KOMATSUMOTO, Masashi KIRINOKI, Yuichi CHIGUSA, ...2012 Volume 63 Issue 2 Pages 103-107
Published: June 30, 2012
Released on J-STAGE: July 06, 2013
JOURNAL FREE ACCESSCharacteristics of patients with either bee sting, centipede bite, or viper bite treated at Ashikaga Red Cross Hospital in Tochigi Prefecture, Japan between January 2009 and October 2011 were retrospectively investigated. Consequently 61 cases of bee sting, 42 of centipede bite, and 11 of viper bite were cited. Among these, male cases with bee sting or viper bite were more numerous than female cases, including severe cases, while more female than male cases with centipede bite consulted the emergency room (ER) during the night. A case of bee sting accompanied by anaphylactic shock was immediately treated by an ER doctor in an ambulance at the incident site. However, a shock case of viper bite occurred at the outpatient consultation room of our hospital more than two hours after the bite. The hand was the most commonly injured body part in sting and bite cases, while the head and arms were at greatest risk of bee sting. Bee sting and centipede bite occurred between April and October, and were most frequently encountered from July to September in the Ashikaga area. In this area, more attention is paid to viper bite from May to August than at any other time of the year.View full abstractDownload PDF (364K) -
Mamoru TAKAHASHI, Kenichi TAKAHASHI, Hitoko MISUMI2012 Volume 63 Issue 2 Pages 109-112
Published: June 30, 2012
Released on J-STAGE: July 06, 2013
JOURNAL FREE ACCESSNeotrombicula teuriensis n. sp. is described and illustrated. The type material was collected from the nesting grounds of the Rhinoceros Auklet Cerorhinca monocerata (Pallas, 1811) on Teuri Island, Hokkaido, Japan. This new species may be distinguished easily by a 2-pronged palpotibial claw (internal>external), sensillae flagelliform and a dorsal setae arrangement of 2–8–6–6–4–4–2.View full abstractDownload PDF (775K) -
Hiroshi YAMANISHI2012 Volume 63 Issue 2 Pages 113-122
Published: June 30, 2012
Released on J-STAGE: July 06, 2013
JOURNAL FREE ACCESSThe infection rate and characteristics of metacercaria of Paragonimus ohirai in the brackish water crab (Sesarma dehaani) was investigated in Kikuyashima, a sandbank located near the mouth of the Maruyama River in northern Hyogo Prefecture, between 2001 and 2009. The infection rate was 76.5% in 2001 and 76.1% in 2002, but increased to 87.0% in 2003. It remained high at 84.6% in 2004 and 92.1% in 2005, dropped to 80.4% in 2006, then increased again to over 90%, specifically 93.4% in 2007, 95.6% in 2008, and 91.5% in 2009. The rate of metacercaria infection remained high for several years. The largest number of metacercariae found in a single crab was 293 (2003). Regarding seasonal variation in the infection rate, there were years in which the rate tended to be low during from May to July, and others in which the rate was above 80% from May to October. On the shore opposite Kikuyashima, the rate of metacercaria infection in S. dehaani was about 40%, indicating spatial variation across short distances. On the shore area near Kinosaki-ohashi, where a high density of S. dehaani and a high rate of metacercaria infection had been reported in the 1950s, few S. dehaani were found, and no infecton by metacercaria was observed. The life cycle of P. ohirai had been affected by environmental changes.View full abstractDownload PDF (7369K) -
Thahsin FARJANA, Nobuko TUNO2012 Volume 63 Issue 2 Pages 123-131
Published: June 30, 2012
Released on J-STAGE: July 06, 2013
JOURNAL FREE ACCESSMultiple blood feeding (MBF) in a gonotrophic cycle in vector mosquitoes influences pathogen transmission by increasing host-vector contact. Multiple blood meals can be caused by malnutrition in the larval stage, a harsh environment in the adult stage, or interrupted feeding due to host defense. We focused on the effect of body size on MBF in two vector mosquitoes, Aedes aegypti (L.) and Aedes albopictus (Skuse), in the laboratory, using small and large adults of both species. Most females (94.3% of Ae. aegypti and 88.2% of Ae. albopictus) oviposited with the first blood meal. There was no relationship between body size and MBF proportion in either species. However, there was a negative relationship between body size and egg retention ratio in Ae. albopictus ovaries and between body size and the ratio of immature follicles in both species. Small Ae. albopictus laid some eggs but retained the rest in their ovaries, as did 5.3% of Ae. aegypti. Large Ae. albopictus developed 68.4–81.7% of follicles, whereas, small ones developed about 50%. Large Ae. aegypti developed 98.0–99.8% of follicles, whereas small females developed only 83.5–88.4%. These results suggest that oviposition was incomplete in small females with low energy reserves, and that females emerging under subpar-diet conditions may perform MBF to improve fecundity.View full abstractDownload PDF (432K)
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