Impact of groundwater abstraction on physical habitat of brown trout (Salmo trutta) in a small Danish stream

2009 ◽  
Vol 40 (4) ◽  
pp. 394-405 ◽  
Author(s):  
M. Olsen ◽  
E. Boegh ◽  
S. Pedersen ◽  
M. F. Pedersen
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Reference Conditions ◽  
Habitat Model ◽  
Physical Habitat ◽  
Habitat Conditions ◽  
Groundwater Abstraction ◽  
Stream Discharge ◽  
Brown Trout Salmo Trutta ◽  
The Impact

The purpose of this study was to assess the impact of groundwater abstraction on stream discharge and physical habitat conditions for brown trout (Salmo trutta) in a small Danish stream. Stream discharge was simulated using a lumped hydrological model (NAM) and a scenario was set up for stream discharge reference conditions. Stream physical habitat conditions (WUA) were simulated for four life stages of trout using a hydraulic habitat model (RHYHABSIM). The impact of groundwater abstraction on WUA for trout was assessed by combined simulations from the NAM model and the RHYHABSIM model. The model predicted that groundwater abstraction reduced median annual discharge by 37% and mean annual 90th percentile discharge by 82%. Summer discharge was relatively most affected by groundwater abstraction and WUA was therefore particularly affected by groundwater abstraction during summer. WUA for adult trout was mainly controlled by suitable water depths (>40 cm) even under conditions without abstraction. On an annual basis WUA for fry and juvenile trout was most affected by abstraction. Future modelling should consider improving simulation of low discharges and preferably not use general hydrological models.

scholarly journals The Impact of Hydropeaking on Juvenile Brown Trout (Salmo trutta) in a Norwegian Regulated River

2020 ◽  
Vol 12 (20) ◽  
pp. 8670
Author(s):  
Svein Jakob Saltveit ◽  
Åge Brabrand ◽  
Ana Juárez ◽  
Morten Stickler ◽  
Bjørn Otto Dønnum
Keyword(s):  
Power Plant ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Water Levels ◽  
Regulated River ◽  
Low Flow ◽  
High Survival ◽  
Power Station ◽  
Brown Trout Salmo Trutta ◽  
The Impact

The Norwegian electrical energy supply system is based on hydropower. The now deregulated energy market has led to increased use of hydropeaking production, leading to greater fluctuations in discharge and water levels below hydropower stations. The power station HOL 1, with an outlet to the Storåne River, is a large hydropeaking facility. With over 300 rapid flow increases and decreases per year since 2012, it is a river subjected to frequent hydropeaking. To quantify the stranding risk downstream of the power plant, the effect of a series of different turbine shutdown scenarios was simulated in an earlier study. The residual flow of 6 m3·s−1 and a full production of 66 m3·s−1 were considered as the baselines for the calculation of dewatered areas. A three-year study of juvenile fish density both upstream as a reference and downstream of the power plant was undertaken. There were very low densities or even an absence of brown trout (Salmo trutta) older than young-of-the-year (YoY) below the outlet of the power station, despite high densities of YoY in previous years. This is probably due to the large and rapid changes in flow below the power station. Hydropeaking has less impact on the earliest life stages of brown trout during spring and summer, as well as on spawning and egg development during winter. This is attributed spawning in late autumn occurring at a low flow seldom reached during hydropeaking. The high survival of YoY during the first summer and early autumn is likely due to a lower frequency of hydropeaking and higher residual flows, leaving a larger wetted area.

The impact of introduced pike (Esox lucius L.) on allopatric brown trout (Salmo trutta L.) in a small stream

Hydrobiologia ◽  
2014 ◽  
Vol 744 (1) ◽  
pp. 223-233 ◽  
Author(s):  
Trygve Hesthagen ◽  
Odd T. Sandlund ◽  
Anders G. Finstad ◽  
Bjørn O. Johnsen
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Esox Lucius ◽  
Small Stream ◽  
Pike Esox Lucius ◽  
Brown Trout Salmo Trutta ◽  
The Impact

scholarly journals Erratum to: Assessing the impact of climate change on brown trout (Salmo trutta fario) recruitment

Hydrobiologia ◽  
2015 ◽  
Vol 751 (1) ◽  
pp. 23-24
Author(s):  
Julian Junker ◽  
Florian U. M. Heimann ◽  
Christoph Hauer ◽  
Jens M. Turowski ◽  
Dieter Rickenmann ◽  
...  
Keyword(s):  
Climate Change ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Impact Of Climate Change ◽  
Brown Trout Salmo Trutta ◽  
The Impact ◽  
Salmo Trutta Fario

scholarly journals Temperature affects growth allometry and development patterns in brown trout (Salmo trutta) fry: a multitrait approach

2018 ◽  
Vol 75 (5) ◽  
pp. 714-722 ◽  
Author(s):  
Emilie Réalis-Doyelle ◽  
Enric Gisbert ◽  
Carles Alcaraz ◽  
Fabrice Teletchea ◽  
Alain Pasquet
Keyword(s):  
Brown Trout ◽  
Growth Phase ◽  
Salmo Trutta ◽  
Developmental Stages ◽  
Growth Patterns ◽  
Second Growth ◽  
Brown Trout Salmo Trutta ◽  
Allometric Analysis ◽  
The Impact ◽  
Skeletal Mineralization

To study the influence of temperature (4, 6, and 12 °C) on the development of brown trout (Salmo trutta) from hatching to the end of metamorphosis, an analysis of allometric growth patterns was conducted to identify two different groups of individuals, namely developmental phases at total lengths (TL) ranging from 2.72 cm at 4 °C to 2.22 cm at 12 °C. Then, a multitrait approach considering different variables like the survival rate, development time, morphometric characteristics, energetic value, and skeletal mineralization was conducted on these two groups. Results indicated that the first growth phase was slower at 4 °C, whereas the second was also slower at this temperature, even though swimming behavior was already present. However, at 12 °C, fry showed a delay in their development (i.e., lower levels of skeletal mineralization and energetic content) during the first growth phase, but they compensated during the second growth phase, reaching the same size in TL when compared with the other temperatures (4 and 6 °C); fry at 12 C° showed low energy reserves. Our study demonstrated that the use of an allometric analysis to identify different developmental stages coupled with a multitrait approach was more efficient than a classical distinction between biological stages (hatching, emergence, first food intake, and exogenous feeding), and this procedure is of interest when evaluating the impact of rearing conditions on early development in fish.

scholarly journals Differences in brain morphology of brown trout across stream, lake, and hatchery environment

2021 ◽  
Author(s):  
Libor Závorka ◽  
J. Koene ◽  
Tiffany Armstrong ◽  
Lena Fehlinger ◽  
Colin Adams
Keyword(s):  
Brown Trout ◽  
Habitat Complexity ◽  
Salmo Trutta ◽  
Brain Size ◽  
Cognitive Capacity ◽  
Brain Morphology ◽  
Physical Habitat ◽  
Omega 3 ◽  
Brown Trout Salmo Trutta ◽  
Size And Morphology

The trade-off between cognitive capacity and developmental costs drive brain size and morphology across fish species, but this pattern is less explored at intraspecific level. Physical habitat complexity has been proposed as a selection pressure on cognitive capacity that shapes brain morphology of fishes, but development of brain is also inherently linked to supply of energy and nutrients, particularly of omega-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA). In this study, we compared brain morphology of brown trout Salmo trutta from stream, lake, and hatchery environments, which differ in physical complexity and availably of dietary n-3 LC-PUFA ranging from low habitat complexity and high n-3 LC-PUFA availability in hatchery to high habitat complexity and low n-3 LC-PUFA availability in streams. We found that brain size, and size of optic tectum and telencephalon differed across the three habitats, being largest in lake fish. We suggest that these differences appeared to associate with diet quality and habitat specific behavioural adaptations rather than physical habitat complexity.

Modelling of thermal habitat loss of brown trout (Salmo trutta) due to the impact of climate warming

2019 ◽  
Vol 19 (1) ◽  
pp. 167-177 ◽  
Author(s):  
Mahdi Sedighkia ◽  
Asghar Abdoli ◽  
Seyed Ali Ayyoubzadeh ◽  
Amirabas Ahmadi
Keyword(s):  
Habitat Loss ◽  
Brown Trout ◽  
Climate Warming ◽  
Salmo Trutta ◽  
Thermal Habitat ◽  
Brown Trout Salmo Trutta ◽  
The Impact

scholarly journals A Dense Brown Trout (Salmo trutta) Linkage Map Reveals Recent Chromosomal Rearrangements in theSalmoGenus and the Impact of Selection on Linked Neutral Diversity

2017 ◽  
Vol 7 (4) ◽  
pp. 1365-1376 ◽  
Author(s):  
Maeva Leitwein ◽  
Bruno Guinand ◽  
Juliette Pouzadoux ◽  
Erick Desmarais ◽  
Patrick Berrebi ◽  
...  
Keyword(s):  
Linkage Map ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Chromosomal Rearrangements ◽  
Brown Trout Salmo Trutta ◽  
The Impact

Numerical changes in stream-resident brown trout (Salmo trutta): uncovering the roles of density-dependent and density-independent factors across space and time

2007 ◽  
Vol 64 (10) ◽  
pp. 1429-1447 ◽  
Author(s):  
Javier Lobón-Cerviá
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Census Data ◽  
Density Dependent ◽  
Stream Discharge ◽  
Space And Time ◽  
Two Factors ◽  
Brown Trout Salmo Trutta ◽  
Northwestern Spain ◽  
Spatial Habitat

The objective was to uncover the roles of environmental, density-independent, and intrinsic, density-dependent factors as drivers of population size in stream-resident brown trout (Salmo trutta) across space and time. The study was based on census data and environmental variables collected every fourth month over 1986–2006 at 12 sites selected along four Rio Esva tributaries (northwestern Spain). Density-dependent hypotheses involving the operation of current and lagged densities on recruitment and subsequent spawner density were analyzed at three increasingly larger geographical scales (site, stream, and river drainage). No evidence supported these hypotheses, suggesting an overall lack of negative feedbacks among year classes. Stream discharge in March when trout emerge and site depth explained substantial amounts of spatiotemporal variation in recruitment. The effects of these two factors on recruitment were sufficiently strong to be detected in year-class mortality and subsequent spawner density. Discharge and site depth determine the amount of spatial habitat suitable for sized individuals during their lifetime and, hence, the maximum number of individuals across space and time. Recruitment dependence, as a delayed density-dependent factor, adjusts the numbers in excess to the numbers established by spatial habitat. These findings differ markedly from the prediction of the most recent theories of population dynamics and are discussed in this context.

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