Coniferous needle litter acts as a stable food resource for stream detritivores
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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.
KeywordsAllochthonous organic matter Benthic macroinvertebrates Litter Cryptomeria japonica Periphyton Primary consumers
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.
- Bisson, P. A. & D. R. Montogomery, 2006. Valley segments, stream reaches, and channel units. In Hauer, F. R. & G. A. Lamberti (eds), Methods in Stream Ecology, 2nd ed. Academic Press, London: 23–49.Google Scholar
- Frazer, G. W., C. D. Canham & K. P. Lertzman, 1999. Gap Light Analyzer (GLA) Imaging Software to Extract Canopy Structure and Gap Light Transmittion Indices from True Colour Fisheye Photographs: User Manual and Program Documentation. Version 2.0. Simon Frazer University, Burnaby.Google Scholar
- Hisabae, M., S. Sone & M. Inoue, 2010. Breakdown and macroinvertebrate colonization of needle and leaf litter in conifer plantation streams in Shikoku, southwestern Japan. Journal of Forest Research 16: 106–115.Google Scholar
- Kawai, T. & K. Tanida, 2005. Aquatic Insects of Japan: Manual with Keys and Illustrations. Tokai University Press, Kanagawa.Google Scholar
- Merritt, R. W., K. W. Cummins & M. B. Berg, 2008. An Introduction to the Aquatic Insects of North America. Kendall/Hunt Publishing Company, Iowa.Google Scholar
- Ota, I., 2007. A forest owners’ cooperative in Japan: obtaining benefits of certification for small-scale forests. Unasylva 58: 64–66.Google Scholar
- Porra, R. J., W. A. Thompson & P. E. Kriedemann, 1989. Determination of accurate extinction coefficients and simultaneous equations for assaying chlorophylls a and b extracted with four different solvents; verification of the concentration of chlorophyll standards by atomic absorption spectroscopy. Biochemica et Biophysica Acta 975: 384–394.CrossRefGoogle Scholar
- Richardson, J. S. & R. J. Danehy, 2007. A synthesis of the ecology of headwater streams and their riparian zones in temperate forest. Forest Science 53: 131–147.Google Scholar
- Semmens, B. X. & J. W. Moore, 2008. MixSIR: A Bayesian Stable Isotope Mixing Model, Version 1.0. http://www.ecologybox.org.