Next Article in Journal
13 Years of Storms: An Analysis of the Effects of Storms on Lake Physics on the Atlantic Fringe of Europe
Next Article in Special Issue
Head Losses of Horizontal Bar Racks as Fish Guidance Structures
Previous Article in Journal
Analysis of Free and Combined Chlorine Concentrations in Swimming Pool Water and an Attempt to Determine a Reliable Water Sampling Point
Previous Article in Special Issue
Velocity Fields at Horizontal Bar Racks as Fish Guidance Structures
Open AccessArticle

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

1
CERIS–Civil Engineering Research and Innovation for Sustainability, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
2
Applied Ecohydraulics Group, E.T.S.II.AA., University of Valladolid, Av. de Madrid 44, 34004 Palencia, Spain
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 317; https://doi.org/10.3390/w12020317
Received: 26 November 2019 / Revised: 6 January 2020 / Accepted: 16 January 2020 / Published: 21 January 2020
(This article belongs to the Special Issue Fish in Hydropower Affected Rivers)
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. View Full-Text
Keywords: pulsed flows; fish behavior; flow-refuge; physiology; visual stimulus; cyprinids pulsed flows; fish behavior; flow-refuge; physiology; visual stimulus; cyprinids
Show Figures

Figure 1

MDPI and ACS Style

Moreira, M.; Costa, M.J.; Valbuena-Castro, J.; Pinheiro, A.N.; Boavida, I. Cover or Velocity: What Triggers Iberian Barbel (Luciobarbus Bocagei) Refuge Selection under Experimental Hydropeaking Conditions? Water 2020, 12, 317.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop