The effect of littoral complexity on the diel distribution of early juvenile fish communities in temperate freshwater reservoirs

0583571 - BC 2024 RIV US eng J - Článek v odborném periodiku
Sajdlová, Zuzana - Jůza, Tomáš - Draštík, Vladislav - Seďa, Jaromír - Čech, Martin
The effect of littoral complexity on the diel distribution of early juvenile fish communities in temperate freshwater reservoirs.
Ecology of Freshwater Fish. Roč. 32, č. 4 (2023), s. 783-794. ISSN 0906-6691. E-ISSN 1600-0633
Grant CEP: GA MZe(CZ) QK23020002; GA MŠMT(CZ) EF16_025/0007417
Grant ostatní: AV ČR(CZ) StrategieAV21/20
Program: StrategieAV
Institucionální podpora: RVO:60077344
Klíčová slova: perch perca-fluviatilis * horizontal migration * longitudinal profile * spatial-distribution * vertical migrations * sockeye-salmon * predation risk * aquatic macrophytes * European perch
Obor OECD: Ecology
Impakt faktor: 1.8, rok: 2022
Způsob publikování: Open access
https://doi.org/10.1111/eff.12740

The diel distribution of early juvenile fish communities from two temperate freshwater reservoirs that differed in cover of submerged aquatic vegetation was investigated. In the daytime, about 99.9% of the juvenile fish community from the plant-rich Zlutice Reservoir was found in the nearshore belt of submerged aquatic vegetation reaching an average abundance of similar to 7982 inds. 1000 m(-3). In contrast, in the pelagic habitat, few fish were found at day. In the plant-poor Rimov Reservoir, 98.9% of juveniles occupied the pelagic habitat during daytime and reached an average abundance of similar to 333 inds. 1000 m(-3). Vertical distribution of fish in the pelagic habitat in both water bodies was affected by steep thermal and oxygen stratification and no individuals occurred below 6 m depth. At night, 88.8% of the juvenile fish community from the plant-rich Zlutice Reservoir was in the pelagic habitat with an average abundance of similar to 1423 inds. 1000 m(-3). Their diel horizontal shifts were much more pronounced compared to the community from the Rimov Reservoir that reached an average nighttime pelagic abundance of similar to 523 inds. 1000 m(-3). Only 1.1% of the juvenile fish community in the Rimov Reservoir was found in the littoral during the daytime and 0.7% at night reaching an average daytime abundance of similar to 1688 inds. 1000 m(-3) and average nighttime time abundance of similar to 1664 inds. 1000 m(-3). This study indicates that if a well-developed littoral zone with abundant aquatic vegetation is present, early juvenile fish will perform diel horizontal movement in temperate stratified reservoirs.
Trvalý link: https://hdl.handle.net/11104/0351577