Fulfilling spawning flow requirements for potamodromous cyprinids in a restored river segment

Boavida, Isabel; Jesus, Joaquim; Pereira, Vítor; Santos, Cátia; Lopes, Marisa; Cortes, Rui

doi:10.1016/j.scitotenv.2018.04.167

Cited by 36 publications

(9 citation statements)

References 42 publications

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“…They are often used in a series along with other bank stabilization measures or riparian restoration projects, as they are beneficial for adding in-stream fish habitat in river reaches where it is challenging to add habitat by other means, also improving instream habitat conditions by providing a sanctuary for fish [27]. LUNKERS are also useful for habitat improving for nonsalmonid species, where cyprinid species, typically of lower swimming performance compared to salmonids [29], can find refuge under harsh flow conditions [30,31]. These structures have been also used for providing cover and shade along channel banks where riparian vegetation has been eliminated, which can also be referred to as bankhides [26].…”

Section: Introductionmentioning

confidence: 99%

Cover or Velocity: What Triggers Iberian Barbel (Luciobarbus Bocagei) Refuge Selection under Experimental Hydropeaking Conditions?

Moreira

Costa

Valbuena-Castro

et al. 2020

Water

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The rapid river flow variations due to hydropower production during peak demand periods, known as hydropeaking, causes several ecological impacts. In this study, we assessed the potential of an overhead cover and velocity-refuge structure in an indoor flume as an indirect hydropeaking mitigation measure for the cyprinid species Iberian barbel (Luciobarbus bocagei). We designed a lab-scale LUNKERS-type structure using two different materials which were used separately: Wood (opaque) and acrylic (transparent), tested under hydropeaking and base-flow events. Physiological (glucose and lactate) and behavioral (structure use) responses were quantified. The structure use (inside and in the vicinity) and the individual and schooling behavior was assessed. Although there was no evidence that the hydropeaking event triggered a physiological response, the wood structure use was significantly higher than the acrylic one, where the metrics of use increased in the hydropeaking event. Differences between individual and group behavior were only higher for the entrances in the wood structure. The higher frequency of wood structure use under hydropeaking conditions suggests that the visual stimulus conferred by this shaded refuge enables fish to easily find it. The results suggest that the use of overhead and velocity-refuge structures may act as an effective hydropeaking flow-refuge mitigation measure.

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Section: Introductionmentioning

confidence: 99%

Cover or Velocity: What Triggers Iberian Barbel (Luciobarbus Bocagei) Refuge Selection under Experimental Hydropeaking Conditions?

Moreira

Costa

Valbuena-Castro

et al. 2020

Water

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“…The importance of distance to the SHP tailrace, also contributed to species distribution, highlighting the effect of peak flows in fish habitat selection. The importance of substrate has been pointed out in different studies focused on riverine cyprinids [24], namely during the spawning season [74]. In particular, substrate has been correlated to P. duriense distribution, together with cover and shading [58].…”

Section: Discussionmentioning

confidence: 99%

Habitat Use by Pseudochondrostoma duriense and Squalius carolitertii Downstream of a Small-Scale Hydropower Plant

Boavida

Ambrósio

Costa

et al. 2020

Water

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Downstream of small-scale hydropower plants (SHPs), the intensity, frequency and persistence of hydropeaking events often cause an intolerable stress on fish of all life stages. Rapid increases in flow velocity result in fish avoiding unstable habitats and seeking refuge to reduce energy expenditure. To understand fish movements and the habitat use of native Iberian cyprinids in a high-gradient peaking river, 77 individuals were PIT tagged downstream of Bragado SHP in the North of Portugal. Tagged fish species included Pseudochondrostoma duriense and Squalius carolitertii. Fish positions were recorded manually on two different occasions: during hydropeaking events (HP) and without hydropeaking events (NHP). From the 77 tagged fish, we were able to record habitat use for 33 individuals (20 P. duriense and 13 S. carolitertii) in a total of 125 relocations. Fish species were distributed along the river reach with high density in the upstream area in the vicinity of the SHP tailrace, in particular during HP. Fish locations were associated with velocity for P. duriense and S. carolitertii. The latter tended to use faster flowing waters than P. duriense. Our findings on the habitat use in peaking rivers are a valuable tool to help in the selection and design of mitigation measures.

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“…Notwithstanding, the highest velocity of community change was found in a small watershed (Vilariça) that does not drain into the Baixo Sabor reservoirs. This watershed is affected by a number of anthropogenic pressures, draining into another large dam downstream of Baixo Sabor, flowing through an area of intensive agriculture and being subject to habitat management interventions (Boavida et al., 2018), all of which may have contributed to fast community changes. Overall, the spatially continuous mapping of temporal community dynamics provided a visual representation of the type and spatial extent of anthropogenic impacts on stream fish communities, which would have been more difficult to perceive otherwise.…”

Section: Discussionmentioning

confidence: 99%

Spatial modelling of temporal dynamics in stream fish communities under anthropogenic change

Mota‐Ferreira

Filipe

Magalhães

et al. 2020

Diversity and Distributions

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Aim: Understanding temporal changes in aquatic communities is essential to address the freshwater biodiversity crisis. In particular, it is important to understand the patterns and drivers of spatial variation in local community dynamics, generalizing temporal trends from discrete locations to entire landscapes that are the main focus of management. Here, we present a framework for producing spatially continuous views of community dynamics, focusing on stream fish affected by hydropower development. Location: River Sabor, NE Portugal. Methods: We sampled stream fish at thirty sites between 2012 and 2019. Community trajectory analysis was used to quantify the directionality and velocity of community change, and the geometric resemblance of community trajectories between sites. Geostatistical models for stream networks were used to relate metrics describing community dynamics to environmental variables, while controlling for Euclidean and hydrologic spatial dependencies, and to map spatial variation in community dynamics across the watershed. Results: Trajectories in multivariate space underlined strong temporal dynamics, with local communities deviating and returning to previous states, but without evidence for directional changes. Accordingly, directionality values were low and not consistently affected by environmental variables. The velocity of community change varied markedly across the watershed and it was strongly affected by stream order and elevation, with faster changes observed in lowland streams draining into hydroelectric reservoirs and with a high proportion of exotic species. Pairwise distances between community trajectories were strongly related to hydrologic and environmental distances between sites. Main conclusions: Local stream fish communities were in a loose equilibrium across the watershed, but they fluctuated at a faster rate closer to a hydroelectric reservoir. Integrating community trajectory analysis and geostatistical modelling provides a relatively simple framework to understand how, where and why temporal community dynamics vary across dendritic stream networks and to visualize spatial patterns of community change over time in relation to anthropogenic impacts. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Fulfilling spawning flow requirements for potamodromous cyprinids in a restored river segment

Cited by 36 publications

References 42 publications

Cover or Velocity: What Triggers Iberian Barbel (Luciobarbus Bocagei) Refuge Selection under Experimental Hydropeaking Conditions?

Cover or Velocity: What Triggers Iberian Barbel (Luciobarbus Bocagei) Refuge Selection under Experimental Hydropeaking Conditions?

Habitat Use by Pseudochondrostoma duriense and Squalius carolitertii Downstream of a Small-Scale Hydropower Plant

Spatial modelling of temporal dynamics in stream fish communities under anthropogenic change

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