Year: 2012
Type: article
Abstract: Marine derived nutrient (MDN), which is carried to stream by anadromous animals, affects stream and riparian ecosystems at high latitudes. To clarify the consumer of salmon carcasses during early winter of Eastern Hokkaido, we carried out a field experiment on spreading out carcasses (ca. 800 kg) at a woodland stream. Almost all of carcasses were consumed during 10 days. Crows was dominant, and birds abundance including black kite and Steller's sea eagle occupied 96 % of photo-trapping data. Crows were thought as immigrant from ranches surrounding experimental watershed. From the photo-trapping data, although crows fed only if, at least, a part of carcass was exposed over the water surface, Steller's sea eagle fed carcass even if it submerged. It suggests that land use of surrounding the watershed, channel morphology or depth of stream would affect the composition of carcasses consumer. Because of unique behavior (e.g. migration distance, feeding pattern) by bird, spreading distance and amount of MDN would show different pattern against autumn in streams that salmon runs in early winter.
Authors: KAMAUCHI, Hiromitsu, SATO, Syuichi, HAYASHI, Daisuke, OKABE, Yoshihiko, KATSUYAMA, Tomonori, FUKUSHIMA, Keitaro, YOSHIOKA, Ayumu, SATO, Takuya, TOKUCHI, Naoko, NAKAOKA, Masahiro
Language: Japanese
Subfield: Ecology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7208143789