Niche overlap between young brown trout (Salmo trutta) and Siberian sculpin (Cottus poecilopus) in a subalpine Norwegian river

2004 ◽  
pp. 117-125 ◽  
Author(s):  
Trygve Hesthagen ◽  
Randi Saksgård ◽  
Ola Hegge ◽  
Bøne K. Dervo ◽  
Jostein Skurdal
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Niche Overlap ◽  
Brown Trout Salmo Trutta ◽  
Cottus Poecilopus

Niche overlap between young brown trout (Salmo trutta) and Siberian sculpin (Cottus poecilopus) in a subalpine Norwegian river

Hydrobiologia ◽  
2004 ◽  
Vol 521 (1-3) ◽  
pp. 117-125 ◽  
Author(s):  
Trygve Hesthagen ◽  
Randi Saksgård ◽  
Ola Hegge ◽  
Børre K. Dervo ◽  
Jostein Skurdal
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Niche Overlap ◽  
Brown Trout Salmo Trutta ◽  
Cottus Poecilopus

Stable isotope niche convergence in coexisting native and non-native salmonids across age classes

2020 ◽  
Vol 77 (8) ◽  
pp. 1359-1365 ◽  
Author(s):  
Julien Cucherousset ◽  
Libor Závorka ◽  
Sergine Ponsard ◽  
Régis Céréghino ◽  
Frédéric Santoul
Keyword(s):  
Stable Isotope ◽  
Brown Trout ◽  
Brook Trout ◽  
Native Species ◽  
Salmo Trutta ◽  
Niche Overlap ◽  
Age Classes ◽  
Terrestrial Invertebrates ◽  
Brown Trout Salmo Trutta ◽  
Native Salmonids

Niche divergence resulting from coevolution is commonly believed to favour coexistence among competing species; however, recent investigations have demonstrated that an unexpected niche convergence can occur when native and non-native species coexist. Yet, our understanding of the ontogenetic characteristics of this niche convergence remains limited. In the present study, we quantified the stable isotope niche of native brown trout (Salmo trutta) in allopatry and sympatry with non-native brook trout (Salvelinus fontinalis) across four age classes. Our results demonstrated that brown trout displayed a stable isotope niche closer to brook trout in sympatry than in allopatry, which was likely driven by an increased consumption of terrestrial invertebrates by sympatric brown trout. Stable isotope niche overlap was the strongest for young-of-the-year individuals and the intensity of overlap between sympatric native brown trout and non-native brook trout decreased during ontogeny. These findings indicate that niche convergence between the species occur at the earliest age class of the native species and are maintained across ontogeny.

Age and growth of Siberian sculpin (Cottus poecilopus) and young brown trout (Salmo trutta) in a subalpine Norwegian river

Hydrobiologia ◽  
2004 ◽  
Vol 521 (1-3) ◽  
pp. 107-115 ◽  
Author(s):  
Trygve Hesthagen ◽  
Ola Hegge ◽  
Jostein Skurdal ◽  
Børre K. Dervo
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Age And Growth ◽  
Brown Trout Salmo Trutta ◽  
Cottus Poecilopus

Resistance of erythrocytes from Brown trout (Salmo trutta m. trutta L.) affected by ulcerative dermal necrosis syndrome

2011 ◽  
Vol 14 (3) ◽  
pp. 443-448 ◽  
Author(s):  
N. Kurhalyuk ◽  
H. Tkachenko ◽  
K. Pałczyńska
Keyword(s):  
Oxidative Stress ◽  
Lipid Peroxidation ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Thiobarbituric Acid ◽  
Control Group ◽  
Thiobarbituric Acid Reactive Substance ◽  
Tbars Level ◽  
Reactive Substance ◽  
Brown Trout Salmo Trutta

Resistance of erythrocytes from Brown trout (Salmo trutta m. trutta L.) affected by ulcerative dermal necrosis syndrome In the present work we evaluated the effect of ulcerative dermal necrosis (UDN) syndrome on resistance of erythrocytes to haemolytic agents and lipid peroxidation level in the blood from brown trout (Salmo trutta m. trutta L.). Results showed that lipid peroxidation increased in erythrocytes, as evidenced by high thiobarbituric acid reactive substance (TBARS) levels. Compared to control group, the resistance of erythrocytes to haemolytic agents was significantly lower in UDN-positive fish. Besides, UDN increased the percent of hemolysated erythrocytes subjected to the hydrochloric acid, urea and hydrogen peroxide. Results showed that UDN led to an oxidative stress in erythrocytes able to induce enhanced lipid peroxidation level, as suggested by TBARS level and decrease of erythrocytes resistance to haemolytic agents.

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