著者
鈴木 あいり
出版者
酪農学園大学
巻号頁・発行日
pp.1-34, 2018

Endangered costal plants and insects inhabits in Lower Ishikari River, Hokkaido. However, non-native frog, Japanese toad (Bufo japonicus formosus) was introduced into Asahikawa city in 1980, and it was spread the distribution along Ishikari River Basin recently. The toad was firstly found at lower Ishikari River Estuary in 2005, and the established population was confirmed in 2011. Because this invasive toad preys on the above-ground insects in other areas of Hokkaido, it is believed that costal ecosystem of Ishikari Estuary is facing a serious ecological threaty. This study aims to assess the predation impacts of Bufo japonicus formosus by examining their diet composition. And the breeding season Bufo japonicus formosus capture method use large pitfalls and drift fence. Prey species obtained from stomach contents of Bufo japonicus formosus was classified into 16 families of 13 orders among 5 classes. We observed 291 prey species. Grasshoppers weevil families were the highest stomach content and ants and bees also were composed of stomach content at significant level.11 species of ants od which included seed disposal of costal flowers such as Viola grayi and Formica yessensis, were preyed by the toad. This result might show predation influence and impacts of long-term costal landscape and biodiversity. This study also harvested 1,067 Bufo japonicus formosus from April 16 of 2017 to May 22 with drift-fenced pitfall traps. And there were more harvesting at 2018 (from April 19 of 2018 to May 22) with 2,271 toads 1,445 toads were mark-recaptured; however, onlys 422 (29.2%) were recaptured. . . This 2 years research harvested total of 3,338 Bufo japonicus formosus, and more than 90 % were captured in the short period of time (May 1 May 5). Because this short peak, a breeding season of Bufo japonicus formosus at lower Ishikari River might be shorter than other areas. It's important to conduct continual disinfestation activity using a drift fence and pitfall trap and monitoring investigation in the Ishikari River estuary area where indirect effects on the coastal ecosystem are suggested, from now on and link it to the distribution spread, the number of individuals reduction and explosive increased prevention.
著者
本間 裕介
出版者
酪農学園大学
巻号頁・発行日
pp.1-47, 2017

[Objective] Since 2011, large-scale disasters beyond assumptions of governments have occurred frequently throughout Japan, and hazard maps are in the process of change with law amendment etc. Evacuation regime is being improved on the premise of evacuation in a wider area, and the hazard maps are being renewed to assume the maximum class natural disaster. On the other hand, safe areas on the hazard maps will be decreased, consequently residents will need to determine safe places at emergency in their own judgment and evacuate. In this study, conducted the current situation survey of creation and disclosure of flood hazard maps and whether the contents are compatible with wide area evacuation, then extracted issues and proposed to solve using GIS. [Method] First of all researched the current situation of the flood hazard map. The survey target was all municipalities in Hokkaido, and we researched the creation situation, the disclosure situation, and the contents of the flood hazard maps. Also conducted a hearing survey on the current situation and issues of the hazard maps to the Hokkaido Government Office. Based on the results of the current situation survey, extracted "issues related to maintenance" such as creating and disclosing hazard maps, and "design issues" such as contents and displays described on the hazard maps. The design issues were discussed mainly based on easiness of comparison of maps for wide-area evacuation, namely, unity. Furthermore, we evaluated the current situation of the flood hazard maps of all the municipalities in Hokkaido against the extracted 'design issues.' Finally, we proposed a flood hard map that solved the issues using GIS, and summarized the creation workflow. [Result] Based on the results of the current situation survey, it was found that the actual number of municipalities creating and publishing flood hazard maps exceeded the number of grasped by the Hokkaido Government Office and the Ministry of Land, Infrastructure and Transport. Meanwhile, revealed that there are municipalities that have not created even though flood hazard maps are necessary. In addition there were some municipalities that have issues concerning disclosure situation. Also, it turned out that the design of flood hazard maps have wide variation. When evaluated the current situation on three factors, "cardinal direction", "scale of background map", and "color coding of supposed flooding depth", the dispersion of cardinal direction was particularly large. On the other hand, related to color coding of supposed flooding depth, there were also places where the risk of misreading was predicted. Furthermore, indications such as evacuation places and supposed inundation areas had been divided in administrative districts. Created a sample map around the Oasa area in Ebetsu city as an example aimed to solve these problems. This sample map was created using free GIS software, and geoprocessing data released by the government. Then organized and wrote down the work flow as a manual. With this, strived for promote the creation of flood hazard map by municipalities and others. In addition, Added location information to this map file. Thereby made it possible to check the current position when referring the map on the mobile terminal. [Discussion] Can't assert that the proposed sample map to solve the problems is a perfect form of a flood hazard map, however if the way to create hazard map at low cost that isn't limited by administrative districts will spreads, It is considered to leading to mediate between of hazard maps of municipalities. Still, although the solution proposed in this study showed part of the solution concerning the creation and disclosure of a hazard map, it has not yet solved the issue related to public dissemination of the hazard maps that were released. It is considered as a future task to encourage residents' crisis consciousness not only to prepare hazard maps.
著者
Murase Mayumi Tajima Yuko Okamoto Minoru Matsuishi Takashi Yamada Tadasu K. Asakawa M
出版者
酪農学園大学
雑誌
Research of One Health (ROH)
巻号頁・発行日
vol.2014, pp.13-17, 2014-03

Postmortem examination was performed on a female western gray whale (Eschrichtius robustus) stranded at Tomakomai-shi, Hokkaido, Japan in August, 2007, and amphipod whale lice (Cyamus scammoni) and cirripedian epizoites (Cryptolepas rachianecti) were obtained. The histopathological investigation of the epizoites was given. 2007年8月、北海道苫小牧市の海岸でストランド(座礁)したコククジラ(Eschrichtius robustus) 雌1個体の外部寄生虫クジラジラミ類(Cyamus scammoni)と着生生物フジツボ類(Cryptolepas rachianecti)について、日本では千葉に続き二例目の記録をした。また、C. rachianectiの着生部位における組織病理学的検索も実施した。