The Influence of Stream Order and Selected Stream Bed Parameters on Fish Diversity in Raystown Branch, Susquehanna River Drainage, Pennsylvania

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Abstract
Consistent relationships among certain physical parameters with stream order have been shown (summarized in Platt 1974). These parameters in combination are significant in influencing fish population densities and species diversity. Diversity of fishes in Raystown Branch was correlated most highly with stream order; other physical data were significantly correlated with both diversity and stream order. Data from Raystown Branch support the hypothesis that stream order represents a multidimensional network of the physical parameters which comprise it and, as such, can be used as a satisfactory composite index.