2006年
Pattern of natural N-15 abundance in lakeside forest ecosystem affected by cormorant-derived nitrogen
Hydrobiologia
- ,
- ,
- ,
- ,
- 巻
- 567
- 号
- 開始ページ
- 69
- 終了ページ
- 86
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s10750-006-0052-0
- 出版者・発行元
- SPRINGER
Waterbirds are one of the most important groups of organisms inhabiting the land-water interface, especially with regard to mediating the transport of materials from the aquatic to the terrestrial environment. The great cormorant (Phalacrocorax carbo) is a colonial piscivorous bird that transports nutrients from fresh water to forest. We measured cormorant-derived nitrogen at two nesting colonies on the Isaki Peninsula and Chikubu Island at Lake Biwa, Japan, and analyzed the long-term effects of cormorant colonization on the forest nitrogen cycle, and the mechanisms of nitrogen retention. Three sites were examined in each colony: a currently occupied area, a previously occupied but now abandoned area, and a control area never colonized by cormorants. High nitrogen stable isotope ratios of cormorant excreta, the forest floor, mineral soil, and living plants showed cormorant-derived nitrogen in both occupied and abandoned areas. The relationship between delta N-15 and N content showed that the high delta N-15 of the excreta and N turnover in the soil were important at the occupied sites, whereas high delta N-15 of litter was important at the abandoned sites. Physiological changes of various organisms are also important for the N decomposition process. In conclusion, cormorant-derived nitrogen remains in the forest ecosystem as a result of two cormorant activities: heavy deposition of excreta and collection of nitrogen-rich nest material. Colony stage (occupied, abandoned, or never inhabited) and historical change of N decomposition process of an area can be identified from the relationship between delta N-15 and N content.
- リンク情報
- ID情報
-
- DOI : 10.1007/s10750-006-0052-0
- ISSN : 0018-8158
- ORCIDのPut Code : 35134148
- Web of Science ID : WOS:000239147500008