The origins and persistence of anadromy in brook charr

The origins and persistence of anadromy in brook charr We synthesized the results of a coordinated study examining the spatial and temporal movements, genetic structure, and physiological characteristics of sympatric populations of resident and sea-run brook charr across eastern Canada. Our goal was to critically evaluate three working hypotheses that may explain anadromous behaviour in brook charr: (1) resident and anadromous forms have different phylogenic origins; (2) anadromy emerges from freshwater residents; and (3) freshwater residency emerges from anadromous individuals. Our synthesis is consistent with the conclusion that freshwater residency emerging from anadromous individuals is most probable. Overall, anadromy in brook charr is poorly developed and the tactic of sea-running may be described as partial, facultative anadromy if the species must be described in terms of anadromy. The sea-run tactic most probably results from the species’ propensity to move and disperse, the over-production of juveniles, an archetypical physiological ability to tolerate saline environments, and the persistence of critical habitats. When the spatial and temporal physical environments permit, the anadromous behaviour is expressed. The tactic creates an apparent fitness advantages related to growth, but it is not necessarily the only evolutionary stable strategy for a river. Most populations with sea-run forms are declining and successful conservation of sea-run forms will depend on managing harvests and more importantly, protection of the temporally and spatially complexity of critical habitats. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

The origins and persistence of anadromy in brook charr

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Publisher
Springer Netherlands
Copyright
Copyright © 2010 by Springer Science+Business Media B.V.
Subject
Life Sciences; Zoology ; Freshwater & Marine Ecology
ISSN
0960-3166
eISSN
1573-5184
D.O.I.
10.1007/s11160-010-9160-z
Publisher site
See Article on Publisher Site

Abstract

We synthesized the results of a coordinated study examining the spatial and temporal movements, genetic structure, and physiological characteristics of sympatric populations of resident and sea-run brook charr across eastern Canada. Our goal was to critically evaluate three working hypotheses that may explain anadromous behaviour in brook charr: (1) resident and anadromous forms have different phylogenic origins; (2) anadromy emerges from freshwater residents; and (3) freshwater residency emerges from anadromous individuals. Our synthesis is consistent with the conclusion that freshwater residency emerging from anadromous individuals is most probable. Overall, anadromy in brook charr is poorly developed and the tactic of sea-running may be described as partial, facultative anadromy if the species must be described in terms of anadromy. The sea-run tactic most probably results from the species’ propensity to move and disperse, the over-production of juveniles, an archetypical physiological ability to tolerate saline environments, and the persistence of critical habitats. When the spatial and temporal physical environments permit, the anadromous behaviour is expressed. The tactic creates an apparent fitness advantages related to growth, but it is not necessarily the only evolutionary stable strategy for a river. Most populations with sea-run forms are declining and successful conservation of sea-run forms will depend on managing harvests and more importantly, protection of the temporally and spatially complexity of critical habitats.

Journal

Reviews in Fish Biology and FisheriesSpringer Journals

Published: Feb 27, 2010

References

  • Influence of individual body size and variable thresholds on the incidence of a sneaker male reproductive tactic in Atlantic salmon
    Aubin-Horth, N; Dodson, JJ
  • The cost of peripheral males in a brook trout mating system
    Blanchfield, PJ; Ridgway, MS
  • Breeding success of male brook trout (Salvelinus fontinalis) in the wild
    Blanchfield, PJ; Ridgway, MS; Wilson, CC
  • The rise and fall of isolation by distance in the anadromous brook charr (Salvelinus fontinalis Mitchill)
    Castric, V; Bernatchez, L
  • Seasonal changes in the hypo-osmoregulatory ability of brook charr: the role of environmental factors
    Claireaux, G; Audet, C

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