|| 要旨トップ | 目次 |||日本生態学会第62回全国大会 (2015年3月、鹿児島) 講演要旨
一般講演（口頭発表） G1-09 (Oral presentation)
We examined the effect of clear-cut and plantation of riparian forest (Japanese cedar) on stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) and radiocarbon natural abundances (Δ14C) of stream macroinvertebrates such as insect larvae. Macroinvertebrates and their potential food sources (periphytic algae and leaf litter of terrestrial plants) were collected from six headwater streams having similar geographic properties except for the stand age of riparian forest.
Both the δ13C values of periphytic algae and stream macroinvertebrates decreased with forest age. Except for grazers, most macroinvertebrates showed Δ14C values similar with those of terrestrial litter and modern atmospheric CO2. The Δ14C values of grazers (i.e., aquatic primary consumers) were significantly lower than those of modern atmospheric CO2 and other macroinvertebrates. Our results suggest that the forest rotation of clear-cut and plantation alters transfer pathway of energy and materials between terrestrial and aquatic ecosystems, but the impact on food web structure may be limited.