Spatial and temporal effects of interspecific competition between Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) in winter

2001 ◽  
Vol 58 (6) ◽  
pp. 1133-1140 ◽  
Author(s):  
A J Harwood ◽  
N B Metcalfe ◽  
J D Armstrong ◽  
S W Griffiths

Previous work has shown that juvenile stream-dwelling salmonids become predominantly nocturnal during winter by emerging from daytime refuges to feed, with several species having been shown to prefer slow-flowing water while active at night. We used seminatural stream channels, landscaped to provide a choice of water depths, and hence velocities, to test whether Atlantic salmon, Salmo salar, and brown trout, Salmo trutta, show similar habitat preferences during winter. We also tested whether there was any spatial or temporal displacement of Atlantic salmon when in sympatry with brown trout. Nighttime observations revealed that Atlantic salmon did have a preference for slow-flowing water. However, when in direct competition with trout, salmon either remained predominantly nocturnal but occupied shallower water, or became significantly less nocturnal, spending more time active during the day than when in allopatry. These results, which were especially marked in relatively larger fish, indicate that competition between the two species for food and resources is not restricted to the summer months and may affect both the short- and long-term growth and survival of overwintering wild Atlantic salmon.

2011 ◽  
Vol 20 (4) ◽  
pp. 548-557 ◽  
Author(s):  
Linnea Lans ◽  
Larry A. Greenberg ◽  
Jens Karlsson ◽  
Olle Calles ◽  
Monika Schmitz ◽  
...  

2002 ◽  
Vol 293 (2) ◽  
pp. 106-118 ◽  
Author(s):  
Christian K�lb�k Tipsmark ◽  
Steffen S�ndergaard Madsen ◽  
Michel Seidelin ◽  
Akim Stypinsky Christensen ◽  
Christopher Paul Cutler ◽  
...  

Genome ◽  
2000 ◽  
Vol 43 (1) ◽  
pp. 185-190 ◽  
Author(s):  
J Perez ◽  
P Moran ◽  
E Garcia-Vazquez

This work describes the isolation, characterization, and physical location of the methionine tRNA in the genome of Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.). An Atlantic salmon genomic library was screened using a tRNAMet probe from Xenopus laevis. Two cosmid clones containing the Atlantic salmon tRNAMet gene were isolated, subcloned and sequenced. The tRNAMet was mapped to metaphase chromosomes by fluorescence in situ hybridization (FISH). Chromosomal data indicated that the tDNA of methionine is tandemly repeated in a single locus in both species. Analysis of genomic DNA by Southern hybridization confirmed the tandem organization of this gene. Key words: cosmids, cloning, in situ hybridization, tRNAMet.


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