著者

角田 裕志 満尾 世志人 千賀 裕太郎

出版者

日本生態学会

雑誌

保全生態学研究 (ISSN:13424327)

巻号頁・発行日

vol.16, no.2, pp.243-248, 2011-11-30

被引用文献数

1

---

We investigated the fish fauna in 50 irrigation ponds in Iwate prefecture, northeastern Japan. Four cases of new invasions of alien largemouth bass, Micropterus salmoides, into previously non-invaded ponds were observed during surveys from 2008 to 2009. Given the limitations of natural migration by largemouth bass, all of these cases were likely the result of illegal stocking. In three of the ponds, establishment of new populations of bass was successfully prevented by the removal of collected individuals during our survey. However, the population eradication in the remaining pond failed, and the recruitment of juveniles was observed in 2010 surveys. Our results suggest that the Invasive Alien Species Act was insufficient to prevent illegal stocking of largemouth bass and that further countermeasures such as monitoring surveys and patrolling are needed.

著者

角田 裕志

出版者

一般社団法人 日本生態学会

雑誌

日本生態学会誌 (ISSN:00215007)

巻号頁・発行日

vol.69, no.1, pp.37-44, 2019 (Released:2019-04-11)

参考文献数

56

被引用文献数

2

著者

角田 裕志

出版者

Association of Wildlife and Human Society

雑誌

野生生物と社会 (ISSN:24240877)

巻号頁・発行日

vol.5, no.1, pp.5-15, 2017 (Released:2017-12-08)

参考文献数

65

被引用文献数

4

---

Ponds are small waterbodies holding unique biota and relative-higher biodiversity than other freshwater ecosystems (i.e., rivers, lakes and streams). In Japan, irrigating farm ponds are typical lentic environments in Satoyama landscapes. Currently, however, there is growing concern for pond conservation because of declines and abandonments of ponds across the country. Japanese population number has started depopulating in 2011 and was estimated decreasing to about two-thirds in 2060. The social change in future Japan can affect agricultural landscapes, including farm ponds. In the paper, I reviewed and discussed ecological effects of pond abandonments on aquatic ecosystems, owing to the depopulation in future Japan. If farm ponds are abandoned, aquatic biodiversity drastically degrade and then most of aquatic species disappear, owing to vegetation succession. Although it needs maintaining operations (e.g., mowing and dredging) for conserving aquatic biota in farm ponds, it will be difficult in depopulated/abandoned settlements. I here suggested new systems and frameworks for conservation of pond ecosystems under the depopulating situation.

著者

角田 裕志 満尾 世志人 千賀 裕太郎

出版者

一般社団法人 日本生態学会

雑誌

保全生態学研究 (ISSN:13424327)

巻号頁・発行日

vol.16, no.2, pp.243-248, 2011-11-30 (Released:2017-08-01)

参考文献数

15

被引用文献数

4

---

We investigated the fish fauna in 50 irrigation ponds in Iwate prefecture, northeastern Japan. Four cases of new invasions of alien largemouth bass, Micropterus salmoides, into previously non-invaded ponds were observed during surveys from 2008 to 2009. Given the limitations of natural migration by largemouth bass, all of these cases were likely the result of illegal stocking. In three of the ponds, establishment of new populations of bass was successfully prevented by the removal of collected individuals during our survey. However, the population eradication in the remaining pond failed, and the recruitment of juveniles was observed in 2010 surveys. Our results suggest that the Invasive Alien Species Act was insufficient to prevent illegal stocking of largemouth bass and that further countermeasures such as monitoring surveys and patrolling are needed.

著者

角田 裕志 土井 真樹絵 大平 充 満尾 世志人 千賀 裕太郎

出版者

「野生生物と社会」学会

雑誌

野生生物保護 (ISSN:13418777)

巻号頁・発行日

vol.13, no.2, pp.59-66, 2012

参考文献数

26

---

We investigated fish fauna in the littoral areas of Lake Saiko and Shojiko, Yamanashi Prefecture, Central Japan and compared them with those in previous studies. Two species have newly appeared in each lake: <i>Oncorhynchus masou masou</i> (Salmonidae) and <i>Pseudogobio esocinus esocinus</i> (Cyprinidae) in Lake Saiko and two Gobiidae species, <i>Tridentiger brevispinis</i> and <i>Gymnogobius urotaenia</i>, in Lake Shojiko. Three of these fishes are non-indigenous Japanese fishes and may have been introduced unintentionally in recent years, whereas <i>O. masou masou</i> was stocked for fishing by fishery managers of Lake Saiko. In Lake Saiko, the fish species composition has greatly changed and a goby, <i>Rhinogobius</i> sp. OR, has been dominated by another goby, <i>T. brevispinis</i>, during the past decade. In Lake Shojiko, species composition and dominant species has not changed and a goby, <i>R.</i> sp. OR, was the dominant benthic fish in littoral areas. However, we found that <i>T. brevispinis</i> has also invaded Lake Shojiko recently and greatly increased in number during the study period. The results indicated that unintentional introduction of non-indigenous fish species may have frequently occurred with fish stocking in recent years.

著者

角田 裕志 和田 敏 安藤 正規

出版者

Association of Wildlife and Human Society

雑誌

野生生物と社会 (ISSN:24240877)

巻号頁・発行日

vol.4, no.2, pp.39-46, 2017 (Released:2017-06-17)

参考文献数

23

被引用文献数

2

---

It is concerned that intensive browsing by sika deer (Cervus nippon) has caused declines and disappearances of vegetations in forest floor, resulting in degradations of forest ecosystems across Japan. To determine the effects of deer browsing on forest ecosystems in Gifu Prefecture, we surveyed the decline of understory vegetation in deciduous hardwood forests in 376 forest stands using the shrub-layer decline rank (SDR), which was assessed by combining the coverage of the shrub-layer vegetation and the presence of signs of browsing by sika deer in each forest stand. We found that remarkable declines of vegetations (i.e., shrub-layer vegetation coverage was less than 38%) due to deer browsing were observed in 31.1% of the surveyed stands. We then estimated the spatial distribution of SDR in deciduous hardwood forests, based on sampled data, using a spatial interpolation method in the Geographic Information System. The results of the spatial estimation indicated that remarkable vegetation declines due to deer browsing could be occurred in 22.2% of the forests (1,133.5 km2), mainly distributed western and central areas of the prefecture. Moreover, our findings indicated that effects of deer browsing on forest ecosystem have started to expand northward and eastward of the prefecture. For conservation of forest ecosystem, we suggest reinforcing sika deer culling in the northern and eastern areas of Gifu Prefecture, where numbers of deer caught were relatively smaller than those in the western and central areas.

著者

大橋 春香 野場 啓 齊藤 正恵 角田 裕志 桑原 考史 閻 美芳 加藤 恵里 小池 伸介 星野 義延 戸田 浩人 梶 光一

出版者

植生学会

雑誌

植生学会誌 (ISSN:13422448)

巻号頁・発行日

vol.30, no.1, pp.37-49, 2013-06-25 (Released:2017-01-06)

参考文献数

26

被引用文献数

3

---

1. 栃木県南西部に位置する佐野市氷室地区において,耕作放棄地に成立する植物群落の違いに着目して集落周辺の環境を区分し,イノシシの生息痕跡の分布との関係を明らかにすることを目的とした. 2. 調査地域における86地点の耕作放棄地において植生調査を実施し,クラスター解析によって種組成を類型化したうえで,各類型を反映させた環境区分図を作成した.さらに,調査地域において約1km^2の調査区を設置し,2010年11月,2011年2月,5月,8月にイノシシの生息痕跡調査を実施した. 3. クラスター解析の結果,調査地域の耕作放棄地に成立する植物群落は管理の状態や土壌の乾湿を反映し,メヒシバ-オヒシバ群落(C1a),アキノエノコログサ-ハルジオン群落(C1b),イヌビエ-コブナグサ群落(C2),ヨモギ-ヘビイチゴ群落(C3a),ススキ-セイタカアワダチソウ群落(C3b),アズマネザサ群落(C4)の6つの類型に区分された. 4. イノシシの採餌痕跡は,C3a,C3b,C4において年間を通じて最も多く確認された.また,秋から冬にかけてはC1aおよびC1b,庭,果樹園において春から夏にかけてはC2,竹林,河川においてそれぞれイノシシの採餌痕跡が多く確認された.イノシシの休息痕跡は8月にC3bとC4で多く確認された. 5. 耕作放棄地に成立する植物群落のなかでも,遷移の進行したC3bやC4における刈り取りなどの植生管理はイノシシによる被害を抑制するうえでもっとも重要であると考えられた.

著者

井上 剛 須田 知樹 角田 裕志 桑原 康生 西川 真理

出版者

日本哺乳類学会

雑誌

哺乳類科学 (ISSN:0385437X)

巻号頁・発行日

vol.48, no.1, pp.179-184, 2008 (Released:2008-07-16)

参考文献数

14