USE OF RIVER HABITAT SURVEY TO DETERMINE THE SPAWNING HABITAT CHARACTERISTICS OF TWAITE SHAD (ALOSA FALLAX FALLAX).
The spawning habitat of twaite shad comprises a fast-flowing shallow area of unconsolidated gravel/pebble and/or cobble substrate. The River Habitat Survey flow types « smooth flow », « rippled flow » and « unbroken standing waves » were significantly (P < 0.05) associated with the presence or absence of shad eggs. The presence of eggs was significantly associated with the higher energy flow types « rippled flow » and « unbroken standing waves », and the absence of eggs was significantly associated with the lower energy flow type « smooth flow ».
Auteurs du document :
P. A. CASWELL, M. W. APRAHAMIAN
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Mots clés :
Alosa fallax fallax, spawning habitat, River Habitat Survey, Alosa fallax fallax, habitat de ponte, « River Habitat Survey »