Growth and food of young-of-the-year brook charr,Salvelinus fontinalis, in lake and creek environments

1993 ◽  
Vol 37 (2) ◽  
pp. 131-138 ◽  
Author(s):  
R. Allen Curry ◽  
Stephanie Allen ◽  
Michael G. Fox ◽  
George E. Morgan
Keyword(s):  
Salvelinus Fontinalis ◽  
Brook Charr ◽  
Young Of The Year

Movers and Stayers: Foraging Tactics of Young-of-the-Year Brook Charr, Salvelinus fontinalis

10.2307/4962 ◽  
1987 ◽  
Vol 56 (3) ◽  
pp. 1001 ◽  
Author(s):  
James W. A. Grant ◽  
David L. G. Noakes
Keyword(s):  
Salvelinus Fontinalis ◽  
Brook Charr ◽  
Foraging Tactics ◽  
Young Of The Year

Quantitative field investigations of feeding and territorial behaviour of young-of-the-year brook charr, Salvelinus fontinalis

1985 ◽  
Vol 12 (3) ◽  
pp. 219-229 ◽  
Author(s):  
Richard E. McNicol ◽  
Eberhard Scherer ◽  
Elaine J. Murkin
Keyword(s):  
Salvelinus Fontinalis ◽  
Territorial Behaviour ◽  
Brook Charr ◽  
Field Investigations ◽  
Young Of The Year

Individual Variation in Foraging Movements in a Lake Population of Young-of-the-Year Brook Charr (Salvelinus Fontinalis)

Behaviour ◽  
1995 ◽  
Vol 132 (1-2) ◽  
pp. 57-74 ◽  
Author(s):  
Mark S. Ridgway ◽  
Peter A. Biro
Keyword(s):  
Environmental Factors ◽  
Littoral Zone ◽  
Salvelinus Fontinalis ◽  
Ingestion Rate ◽  
Brook Charr ◽  
Near Shore ◽  
General Variation ◽  
Young Of The Year ◽  
Pattern Of Variation ◽  
Foraging Movements

AbstractWe examined the variation in foraging movements in a population of young-of-the-year (YOY) brook charr living in the near-shore littoral zone of a lake. By repeating the methodology of an earlier stream study, we made direct comparisons between data from lake and stream populations. In general, the pattern of variation in foraging movements was similar between the two sites with greater variability and activity observed in the lake population. The dichotomous nature of the proportion of time spent moving in the stream was also observed in the lake population but in a reversal of the stream pattern. Charr that moved constantly while foraging represented the largest movement category in the lake. In general, variation in foraging movements were more strongly related to the rate of prey rejection, whereas environmental factors, such as distance from shore, submerged objects, and the amount of overhead riparian cover, were more strongly related to prey ingestion. This last finding directly contrasts with that found in the stream literature for YOY charr in still water where ingestion rate, as estimated using feeding attempt rate, increases with the mobility of YOY charr.

Aggressiveness and the Foraging Behaviour of Young-of-the-Year Brook Charr (Salvelinus fontinalis)

1990 ◽  
Vol 47 (5) ◽  
pp. 915-920 ◽  
Author(s):  
James W. A. Grant
Keyword(s):  
Body Size ◽  
Feeding Rate ◽  
Salvelinus Fontinalis ◽  
Analysis Of Covariance ◽  
Brook Charr ◽  
Size Number ◽  
Foraging Site ◽  
Young Of The Year ◽  
Foraging Radius

Individual young-of-the-year brook charr (Salvelinus fontinalis) were observed in the field to relate their aggressiveness to their body size, the size and quality of their foraging site, and their feeding rate. Aggressive charr were 13% larger than nonaggressive conspecifics observed on the same day in the same area. Aggressive fish had a lateral foraging radius 29% larger than nonaggressive fish and a 45% greater mean distance to neighbours, even when the effect of body size was removed by analysis of covariance. Aggressive fish of two size categories (20–29 and 40–99 mm) made 70 and 55% more feeding attempts per unit time, respectively, than nonaggressive fish of the same size. Number of prey items in stomachs was significantly and positively correlated with feeding attempt rate. In addition, aggressive fish appeared to occupy more preferred sites, since their sites were significantly more likely to be reoccupied after their removal than were sites occupied by nonaggressive fish. These results are consistent with the hypothesis that defence of a foraging site is a better tactic than ignoring conspecifics.

Aggressiveness and foraging mode of young-of-the-year brook charr, Salvelinus fontinalis (Pisces, Salmonidae)

1988 ◽  
Vol 22 (6) ◽  
pp. 435-445 ◽  
Author(s):  
James W. A. Grant ◽  
David L. G. Noakes
Keyword(s):  
Salvelinus Fontinalis ◽  
Brook Charr ◽  
Foraging Mode ◽  
Young Of The Year

Bénéfices à court terme des mouvements anadromes saisonniers pour une population d'omble de fontaine (Salvelinus fontinalis) du Nouveau Québec

1991 ◽  
Vol 48 (11) ◽  
pp. 2212-2222 ◽  
Author(s):  
Jean-François Doyon ◽  
Christiane Hudon ◽  
Roderick Morin ◽  
F. G. Whoriskey Jr.
Keyword(s):  
Water Level ◽  
Egg Size ◽  
Salvelinus Fontinalis ◽  
Condition Factor ◽  
Size At Maturity ◽  
Brook Charr ◽  
Tissue Water Content ◽  
Tissue Water ◽  
Single Population ◽  
Energetic Reserves

This study characterizes the seasonal anadromous movements of a brook charr population and compares its biological and energetic characteristics with charr spending summer in freshwaters. Downstream movements monitored at a counting fence over 3 yr were most intense in spring but occurred until fall and were positively correlated with rapid increases of water level. The timing of movements varied from year to year. Smaller charr were most subject to being swept downstream compared with freshwater residents, and most trout were concentrated near the mouth of the river. These patterns suggest that the downstream movements of charr in this system are passive. Upstream migrants had a higher condition factor and a lower tissue water content than freshwater residents, indicating that downstream movements result in a faster accumulation of energetic reserves during summer. However, the fortuitous character of anadromous migrations as well as the absence of differences in the biological characteristics (growth, size at maturity, fecundity, egg size) suggests that anadromous and resident fish belong to a single population whose yearly migrant component could be randomly determined.

Hydrography and population genetic structure in brook charr (Salvelinus fontinalis, Mitchill) from eastern Canada

2000 ◽  
Vol 9 (7) ◽  
pp. 971-982 ◽  
Author(s):  
C. Hebert ◽  
R. G. Danzman ◽  
M. W. Jones ◽  
L. Bernatchez
Keyword(s):  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Salvelinus Fontinalis ◽  
Brook Charr ◽  
Eastern Canada

scholarly journals Foraging behaviour and brain morphology in recently emerged brook charr, Salvelinus fontinalis

2010 ◽  
Vol 64 (11) ◽  
pp. 1905-1914 ◽  
Author(s):  
Alexander D. M. Wilson ◽  
Robert L. McLaughlin
Keyword(s):  
Foraging Behaviour ◽  
Salvelinus Fontinalis ◽  
Brain Morphology ◽  
Brook Charr

Mechanisms responsible for the niche shift of brook charr, Salvelinus fontinalis Mitchill, when living sympatrically with creek chub, Semotilus atromaculatus Mitchill

1984 ◽  
Vol 62 (8) ◽  
pp. 1548-1555 ◽  
Author(s):  
Pierre Magnan ◽  
Gérard J. FitzGerald
Keyword(s):  
Laboratory Experiments ◽  
Salvelinus Fontinalis ◽  
Niche Shift ◽  
Intraspecific Aggression ◽  
Brook Charr ◽  
Semotilus Atromaculatus ◽  
High Level ◽  
Gill Raker ◽  
Creek Chub ◽  
Study Laboratory

When brook charr, Salvelinus fontinalis Mitchill, are in allopatry in oligotrophic Québec lakes, they feed largely on macrobenthic invertebrates. However, when brook charr cooccur with creek chub, Semotilus atromaculatus Mitchill, they feed largely on zooplankton. In the present study, laboratory experiments showed that creek chub were more effective than brook charr in searching for hidden, patchily distributed prey. The searching efficiency of an individual chub feeding in a group was improved through social facilitation. In contrast, the high level of intraspecific aggression observed in brook charr prevents the formation of such feeding groups. In the laboratory, brook charr were able to displace creek chub from the food source because of interspecific aggression. Data are presented showing that chub are morphologically better adapted than charr to feed on benthos (subterminal orientation of the mouth and protrusible premaxillae), while the charr are better adapted than chub to feed on zooplankton (gill raker structure). Differences in feeding behaviour, morphology, and relative abundance between these species appear to be important in the observed niche shift of brook charr in nature.

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