Transport Dynamics of Organic Matter in Stream Ecosystems

With funding from a National Science Foundation grant, we have developed a technique for radioactively labeling (14C) tiny organic particles (seston) occurring in flowing waters. This has enabled us to initiate studies of the actual mechanisms involved in the suspension, deposition, and retention of seston in natural stream ecosystems and to determine the distances that organic particles are transported under a variety of conditions. The findings should lead to important refinements in basic lotic ecosystem concepts (i.e. river continuum and spiraling concepts) and in the determination of stream organic matter budgets.

1993. Fine particulate organic matter transport dynamics in two Idaho streams. (C. E. Cushing, J. D. Newbold, and G. W. Minshall) Limnology and Oceanography. 38:1101-1115.

2000. Physical factors influencing fine organic particle transport and deposition in streams.  Journal North American Benthological Society 19:1-16.   (G. W. Minshall, S. A. Thomas, J. D. Newbold, M. T. Monaghan, and C. E. Cushing).

2001. The influence of filter-feeding benthic macroinvertebrates on the transport and deposition of particulate organic matter and diatoms in two streams. Limnology Oceanography 46:1091-1099. (M. T. Monaghan, S. A. Thomas, G. Wayne Minshall, J. D. Newbold, and C. E. Cushing).

2001. The influence of particle size on seston deposition in streams. Limnology Oceanography 46:1415-1424. (S. A. Thomas, J. D. Newbold, M. T. Monaghan, G. W. Minshall, T. Georgian, and C. E. Cushing).

2005. Deposition, benthic residence, and resuspension of fine organic particles in a mountain stream. Limnology and Oceanography 50(5):1571-1580. (Newbold, J.D., S.A. Thomas, G.W. Minshall, C.E. Cushing, and T. Georgian).