Linking channel geomorphic characteristics to spatial patterns of spawning activity and discharge use by Atlantic salmon (Salmo salar L.)

摘要: This paper relates spatial patterns of spawning by Atlantic salmon (Salmo salar L.) to channel geomorphic and hydrologic characteristics in two upland Scottish streams. The full length each stream was surveyed classified using a process-based typology. precise locations 845 events were mapped over 3 successive years. These reach type, location-specific discharge calculated for event. Fish used ‘response’ types (pool-riffle transitional pool-riffle/plane bed) preferentially, avoiding ‘transport’ (plane bed step pool). distribution contrasted markedly between the streams, as consequence, activity differed. In stream, fish utilised relatively high flows with almost all occurring at discharges greater than median annual flows, while optimum (defined those where values use most exceeded availability) three times flows. occurred flow range response transport types, primarily result higher maximum former. Because classification procedure is process based (and therefore transferable other geographic areas), present study suggests that type may be predict within catchment. Since data indicate reach-type specific, results also suggest morphology should considered when identifying environmental requirements.