Larval Fish Distribution and Microhabitat Use in Free-Flowing and Regulated Rivers

L'habitat à l'échelle locale : distribution multiparamètre des poissons d'eau courante

“…The availability of gradually sloping shoreline waters with débris and végétation may be important for providing nursery habitat in rivers without extensive backwaters and off-channel habitats. The detailed findings reported by SCHEIDEGGER and BAIN (1995) are the first quantitative and statistically-based analysis of larval fish microhabitat use in rivers, but this study did not fully employ the study approach found effective for comprehensively analysing habitat use in juvénile and adult fish. Better designed studies of larval fish microhabitats are needed to advance our knowledge of this ecologically distinct life stage.…”

Spatial and temporal distribution of native fish larvae in seasonal and perennial tributaries of the Sacramento River, CA, USA

“…Although Mud Creek receives agricultural run-off, has several water diversions, and is constrained by levees along some of its lower reaches, it lacks dams, large-scale water diversions, and in-stream flood control structures like the other creeks sampled in 2004. Scheidegger and Bain (1995) found that larval abundances were lower and family assemblages were different in flow-regulated rivers compared to unregulated rivers. Thus, the differences observed in larval abundances and diversity of species among streams may be explained by the limited upstream movements of migrating adults and flow modifications.…”

“…Seasonal inundation significantly increases the total amount of available aquatic habitat and provides greater habitat heterogeneity than is found in the main channel (Power et al 1995;Sommer et al 2002Sommer et al , 2004. Furthermore, the seasonal habitats generally offer slower, shallower, and warmer water (Turner et al 1994;Scheidegger and Bain 1995) than the mainstem.…”

Les peuplements de poissons de l'année de quelques types d'annexes fluviales dans la plaine de la Bassée (Seine)

“…L'anthropisation croissante des hydrosystèmes, qui débute souvent par la régulation et la chenalisation du fleuve, tend à réduire voire supprimer les connexions latérales du chenal avec ses milieux annexes et annihile leur rôle (HOLCIK, 1990 ;SCHIEMER et WAIDBACHER, 1992 ;PATTON et HUBERT, 1993 ;SCHEIDEGGER et BAIN, 1995). Néanmoins, quelques études semblent indiquer que de nouveaux milieux artificiels générés par les aménagements peuvent se substituer aux annexes naturelles pour remplir un rôle comparable vis-à-vis de la reproduction des espèces piscicoles (SABO et KELSO, 1991 ;POIZAT, 1993).…”