Habitat suitability curves for brown trout (Salmo trutta fario L.) in the River Adda, Northern Italy: comparing univariate and multivariate approaches

Vismara, R.; Azzellino, Arianna; Bosi, Roberto; Crosa, Giuseppe; Gentili, Gaetano

doi:10.1002/1099-1646(200101/02)17:1<37::aid-rrr606>3.0.co;2-q

Cited by 92 publications

(70 citation statements)

References 8 publications

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“…This composition corresponded to a substrate preference curve that has been reported by Valentin (1996) and Vismara et al (2001) for juvenile brown trout. Preliminary tests on this loose substrate showed that during hydropeaking some juveniles hid in the spaces between the coarse gravel that were near the channel wall where velocities were somewhat lower.…”

Section: Experimental Configuration and Test Refuge Entrance Configursupporting

confidence: 66%

“…The highest number of entries occurred in the shear layers between the inflowing and outflowing water, where the most frequent velocities ranged between 0 and 0.2 m/s, reaching values up to 0.3 m/s. The distribution of the preferred velocities for the entry of the fish into the refuge corresponded to the distribution that has been observed for juvenile brown trout in rivers (Souchon et al 1989;Vismara et al 2001;Ayllón et al 2009). …”

Section: Location Of Fish Entries Into the Refugementioning

confidence: 99%

“…and 1?) from Vismara et al (2001). The base discharge of 10 l/s for mean flow velocities of approximately 0.1 m/s occurred in the flume, resulting in a favorable preference index above 0.9 (see Fig.…”

Section: Conditions For Fish Experimentsmentioning

confidence: 99%

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Attractiveness of a lateral shelter in a channel as a refuge for juvenile brown trout during hydropeaking

et al. 2014

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Peak power production in hydroelectric storage power plants results in frequent and intense flow variations in the rivers downstream of the plants. Fish populations can be negatively impacted when subjected to these so-called hydropeaking phenomena. In researching mitigation solutions, shelters in the riverbanks of channelized rivers have been identified as a means of protecting fish from excessive flow velocities. These shelters were studied systematically using juvenile brown trout (Salmo trutta fario) in an experimental configuration in which a straight channel was equipped with a lateral embayment. The purpose of the experiments was to generate hydrodynamic hydropeaking conditions in the channel that are undesirable for juvenile trout, thereby causing them to enter the shelter. The flow velocity distribution in the intersection plane between the main channel and the lateral shelter was found to be a significant parameter for attracting fish to the shelter. The utilization rate of trout in the shelter was used as a performance indicator. Using a basic rectangular shelter configuration without forced water exchange between the shelter and the channel, the utilization rate was only 35 %. This rate was more than doubled by introducing a deviation groyne to force water exchange between the channel and the shelter. The position and orientation angle of this groyne were systematically varied to maximize the utilization rate. Maximum utilization rates approaching 90 % were obtained for an optimum configuration in which an island-type groyne was placed in the shelter. The results of the systematic channel tests showed the potential of the shelter to attract fish. Such a shelter could be used in channelized rivers both for morphological revitalization and to improve fish habitats. As a next step in this research, prototype shelters will be built on a natural river and monitored for 2-3 years under a hydropeaking flow regime.

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Section: Experimental Configuration and Test Refuge Entrance Configursupporting

confidence: 66%

Section: Location Of Fish Entries Into the Refugementioning

confidence: 99%

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Attractiveness of a lateral shelter in a channel as a refuge for juvenile brown trout during hydropeaking

et al. 2014

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“…The relationships among the density of brown trout and environmental variables have been deeply studied in freshwater ecosystems (Armstrong et al, 2003;Ayllón et al, 2009;Vismara et al, 2001;Winkle et al, 1998). Macroinvertebrates are rarely used in habitat-based methods because of the high heterogeneity of the density response along environmental gradients.…”

Section: Introductionmentioning

confidence: 62%

“…In many studies (Muñoz-Mas et al, 2012;Strakosh et al, 2003;Vismara et al, 2001) water depth plays an important role in the definition of habitat suitability for brown trout, our results shows that this effect could be enhanced by the fact that higher depth make new refugia available and also by the fact that deep pool habitat is the preferred mesohabitat.…”

Section: Habitat Suitability Modelsmentioning

confidence: 99%