An inundated Salix stand provides spawning and nursery habitat for native fish in a periodically flooded reservoir zone

Azami, Kazuhiro; Higuchi, Takaya; Konishi, Chisato; Hashimoto, H.; Osugi, Tomonori; Asaedea, Takashi; Nakai, Katsuki

doi:10.1127/rs/2015/0090

Cited by 4 publications

(3 citation statements)

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“…Muška et al, 2013, for adult fishes) since almost all the juvenile fish community stayed in the pelagic zone both during daytime (98.9%) and at nighttime (99.3%) (Table 2). The inundated belt of nearshore semi-terrestrial vegetation can provide fishes with new refuges as was registered by Kahl et al (2008) who revealed a positive correlation between abundance of juvenile roach and inundated semi-terrestrial vegetation in the Saidenbach Reservoir (Germany) or Azami et al (2015) who found inundated willows an important refuge for juvenile silver crucian carp in the Miharu Reservoir (Japan). In the Římov Reservoir (this study), however, the preferred semi-terrestrial plants included mostly soft-leaved vegetation while dense submerged bushes seemed to be avoided as a sterile, dark and relatively cold habitat (M. Čech, V. Draštík, Z. Sajdlová, pers.…”

Section: Habitatmentioning

confidence: 79%

“…However, typical canyonshaped reservoirs, such as the Římov Reservoir, lack the broad and well-established littoral zone; thus, the diel horizontal shifts of early juvenile fish communities have rarely been observed, including in this study. The areas of nearshore semi-terrestrial vegetation could provide fishes with refuge areas as shown by Kahl et al (2008) in Germany and Azami et al (2015) in Japan; however, the semiterrestrial plants in the Římov Reservoir were often dense submerged bushes that seemed to be not a preferred habitat (Figure 2a) (Čech M., Sajdlová Z., Jůza T., Draštík V., Pers. obs.).…”

Section: Habitatmentioning

confidence: 99%

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

Sajdlová

Jůza

Draštík

et al. 2023

Ecology of Freshwater Fish

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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 Žlutice Reservoir was found in the nearshore belt of submerged aquatic vegetation reaching an average abundance of ~7982 inds. 1000 m−3. In contrast, in the pelagic habitat, few fish were found at day. In the plant‐poor Římov Reservoir, 98.9% of juveniles occupied the pelagic habitat during daytime and reached an average abundance of ~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 Žlutice Reservoir was in the pelagic habitat with an average abundance of ~1423 inds. 1000 m−3. Their diel horizontal shifts were much more pronounced compared to the community from the Římov Reservoir that reached an average nighttime pelagic abundance of ~523 inds. 1000 m−3. Only 1.1% of the juvenile fish community in the Římov Reservoir was found in the littoral during the daytime and 0.7% at night reaching an average daytime abundance of ~1688 inds. 1000 m−3 and average nighttime time abundance of ~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.

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Section: Habitatmentioning

confidence: 79%

Section: Habitatmentioning

confidence: 99%

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

Sajdlová

Jůza

Draštík

et al. 2023

Ecology of Freshwater Fish

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“…The profitable effects of water level variation have been described in other studies (Meals and Miranda, ; Paller, ; Nagid et al ., ). On such occasion, the increase in abundance after refilling was primarily addressed to the development of vegetation in exposed areas, providing structures for fish shelter and reproduction (for details, see the example of Azami et al ., ). However, the low‐water period due to the collapse of the gate in Salto Osório was not long enough to allow a significant development of marginal vegetation and associated fauna that could be further flooded.…”

Section: Discussionmentioning

confidence: 97%

The Effects of Rapid Water Level Changes on Fish Assemblages: The Case of a Spillway Gate Collapse in a Neotropical Reservoir

Baumgartner

Gomes

2016

River Research & Apps

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River damming and associated reservoir causes intense and dramatic changes that create new environments, with particular structure and functioning. In these systems, flow control and artificial variations in water level are important determinants of the structure of fish assemblages. Planned reduction in water level (drawdown) is used to manage productivity in reservoirs. However, the effects of non‐planned reductions, such as those related to the collapse of spillway gates, are rarely studied. The objective of this study was to evaluate the effects of a rapid reservoir drawdown, because of the collapse of a gate, on the structure of fish assemblage in a Neotropical reservoir, in Southern Brazil, operated as run‐of‐the‐river. Water level variation because of the collapse reached up to 20 m. A canonical analysis of principal coordinates (CAP) was used to summarize the structure of fish assemblage. Spearman rank correlations were performed between each CAP axes retained for interpretation and fish species abundances, to assess the ones that most contributed to observed patterns. The first CAP axis identified strong variations in the spatial scale, while the third axis identified variations in the time scale (before and after the collapse). The most notable negative effect was the loss of several fish that perished during the reservoir drawdown, probably because of adverse limnological conditions. Results showed significant benefits of water level variation on the entire fish assemblage, and we suggest that, observed some peculiarities, this variation can be used to manage reservoirs, as a tool to enhance fish abundances. Copyright © 2016 John Wiley & Sons, Ltd.

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Changes in the osprey Pandion haliaetus hunting grounds caused by water level fluctuations and the importance of shallow water areas in dam environment

2021

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An inundated Salix stand provides spawning and nursery habitat for native fish in a periodically flooded reservoir zone

Cited by 4 publications

References 0 publications

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

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

The Effects of Rapid Water Level Changes on Fish Assemblages: The Case of a Spillway Gate Collapse in a Neotropical Reservoir

Changes in the osprey Pandion haliaetus hunting grounds caused by water level fluctuations and the importance of shallow water areas in dam environment

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