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Hydrobiologia

, Volume 779, Issue 1, pp 161–171 | Cite as

Coniferous needle litter acts as a stable food resource for stream detritivores

  • Masaru Sakai
  • Keitaro Fukushima
  • Risa S. Naito
  • Yosihiro Natuhara
  • Makoto Kato
Primary Research Paper

Abstract

We investigated the diets of stream detritivores in a coniferous plantation and a deciduous-coniferous mixed forest using stable isotope (δ13C and δ15N) mixing models. In summer, collector-gatherers (Ephemera japonica, McLachlan, and Paralichas sp.) and a shredder (Lepidostoma crassicorne, Ulmer) utilized coniferous needle litter but not broad-leaved deciduous litter as their food resource because coniferous litter was persistent and remained on the streambed in both the forests even in summer. In early spring, L. crassicorne in the mixed forest utilized both coniferous needle litter and broad-leaved deciduous litter because both were abundant and available. However, coniferous needle litter was the only dominant food source available for the shredder species in the plantation where deciduous trees were less abundant. E. japonica and a collector-filterer (Hydropsyche sp.) in the forest possibly utilized fine materials derived from coniferous needle litter but not those derived from broad-leaved deciduous litter as their food resource. Although previous studies have indicated that coniferous needle litter is less nutritious than broad-leaved deciduous litter, persistence of the coniferous needle litter provides a stable basal food resource for shredders, collector-gatherers, and collector-filterers in forested streams that receive litter inputs from neighboring conifers.

Keywords

Allochthonous organic matter Benthic macroinvertebrates Litter Cryptomeria japonica Periphyton Primary consumers 

Notes

Acknowledgments

We thank the staff of the Ashiu Forest Research Station for assistance and maintenance of field access. A portion of this study was supported by JSPS KAKENHI Grant Numbers 10J00142 and 26660127, and the River Fund in charge of the Foundation of River and Watershed Environment Management, Japan.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Masaru Sakai
    • 1
  • Keitaro Fukushima
    • 2
  • Risa S. Naito
    • 3
  • Yosihiro Natuhara
    • 4
  • Makoto Kato
    • 5
  1. 1.Faculty of Science and EngineeringChuo UniversityTokyoJapan
  2. 2.Graduate School of Urban Environmental SciencesTokyo Metropolitan UniversityHachiojiJapan
  3. 3.Graduate School of AgricultureTokyo University of Agriculture and TechnologyFuchuJapan
  4. 4.Graduate School of Environmental StudiesNagoya UniversityNagoyaJapan
  5. 5.Graduate School of Human and Environmental StudiesKyoto UniversityKyotoJapan

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