TITLE

Morphometric and genetic analyses of two sympatric morphs of Arctic char (Salvelinus alpinus) in the Canadian High Arctic

AUTHOR(S)
Arbour, J. H.; Hardie, D. C.; Hutchings, J. A.
PUB. DATE
January 2011
SOURCE
Canadian Journal of Zoology;Jan2011, Vol. 89 Issue 1, p19
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Multivariate morphometric analyses were used to examine variation in head, body, and fin shape between two sympatric morphotypes of Arctic char (Salvelinus alpinus (L., 1758)) from Lake Hazen, Ellesmere Island, Nunavut, Canada. Population structure of the Lake Hazen Arctic char was examined using five microsatellite loci. The 'small' morph was found to have a larger (primarily deeper) head, larger and more elongate fins, and a deeper lateral profile than the 'large' morph. The morphs also differed in allometric growth patterns. The large and small morphs do not appear to represent genetically distinct populations. The head morphology of the Lake Hazen small and large morphs exhibited similarities to benthic and pelagic morphs (respectively) from other lakes. We hypothesize that the large morph may be adapted to high-efficiency swimming and that the small morph may be adapted to low-efficiency, high-acceleration swimming. Such functional trade-offs are not uncommon among fish specializing in dispersed or mobile prey (fish and plankton) and benthic prey, respectively. The lack of apparent genetic differentiation between the morphs may suggest that the morphological differences result, to some extent, from phenotypic plasticity. Based on these results and previous analyses, it seems reasonable to conclude that Lake Hazen Arctic char represent a resource polymorphism. Des analyses morphom�triques multidimensionnelles nous ont servi � �tudier la variation de la forme de la t�te, du corps et des nageoires chez deux morphotypes sympatriques de l'omble chevalier (Salvelinus alpinus (L., 1758)) du lac Hazen, �le d'Ellesmere, Nunavut, Canada. Nous avons d�termin� la structure de population des ombles chevaliers du lac Hazen par l'examen de cinq locus microsatellites. Le morphotype � petit � poss�de une t�te plus grosse (surtout plus haute), des nageoires plus grandes et plus allong�es et un profil lat�ral plus �lev� que le morphotype � grand �. Les morphotypes diff�rent aussi par leurs patrons de croissance allom�trique. Les morphotypes petit et grand ne semblent pas repr�senter des populations g�n�tiquement distinctes. La morphologie de la t�te des morphotypes petit et grand du lac Hazen rappelle les morphotypes (respectivement) benthique et p�lagique d�crits dans d'autres lacs. Nous �mettons l'hypoth�se selon laquelle le grand morphotype peut �tre adapt� � la nage de grande efficacit� et le petit morphotype l'est � la nage de faible efficacit�, mais d'acc�l�ration rapide. De tels compromis fonctionnels ne sont pas rares chez les poissons qui se sp�cialisent respectivement pour les proies dispers�es ou mobiles (poissons et plancton) et pour les proies benthiques. L'absence apparente de diff�renciation g�n�tique entre les morphotypes peut laisser croire que les diff�rences morphologiques proviennent, dans une certaine mesure, de la plasticit� ph�notypique. D'apr�s nos r�sultats et des analyses ant�rieures, il semble raisonnable de conclure que les ombles chevaliers du lac Hazen pr�sentent un polymorphisme bas� sur les ressources.
ACCESSION #
56630734

 

Related Articles

  • Inter-annual growth of Arctic charr (Salvelinus alpinus, L.) in relation to climate variation. Kristensen, David M; Jørgensen, Thomas R; Larsen, Rasmus K; Forchhammer, Mads C; Christoffersen, Kirsten S // BMC Ecology;2006, Vol. 6, p1 

    Background: Major changes in climate have been observed in the Arctic and climate models predict further amplification of the enhanced greenhouse effect at high-latitudes leading to increased warming. We propose that warming in the Arctic may affect the annual growth conditions of the cold...

  • High lacustrine gillnet catchability of anadromous Arctic charr. Borgstrøm, Reidar; Ebne, Ingrid; Svenning, Martin-A. // Hydrobiologia;Aug2010, Vol. 650 Issue 1, p203 

    Arctic charr is the only freshwater fish in most of the High Arctic, with both resident, anadromous, and landlocked populations present. The anadromous Arctic charr is particularly highly sought-after, and has been an important food source for people living in Arctic regions. A recent decline in...

  • Dwarfs and cannibals in the Arctic: production of Arctic char ( Salvelinus alpinus (L.)) at two trophic levels. Berg, Ole K.; Finstad, Anders G.; Olsen, Per H.; Arnekleiv, Jo Vegar; Nilssen, Kjell // Hydrobiologia;Sep2010, Vol. 652 Issue 1, p337 

    Due to extensive cannibalism, Arctic char ( Salvelinus alpinus (L.)) often represent the two highest trophic levels in Arctic freshwater ecosystem where Arctic char often is the only freshwater fish present. There is a general lack of char stock size and production estimates from Arctic lakes...

  • FISHING FOR DINNER.  // National Wildlife (World Edition);Feb/Mar2008, Vol. 46 Issue 2, p10 

    The article discusses the food behavior of polar bears in the Arctic. Polar bears mainly subsist on a diet of seals, which they catch on sea ice. Global warming is causing the ice to shrink forcing the bears to seek food elsewhere. A study published in the journal "Polar Biology" reports that...

  • Contaminant loading in remote Arctic lakes affects cellular stress-related proteins expression in feral charr. Wiseman, Steve; Jørgensen, Even H.; Maule, Alec G.; Vijayan, Mathilakath M. // Polar Biology;Jun2011, Vol. 34 Issue 6, p933 

    The remote Arctic lakes on Bjørnøya Island, Norway, offer a unique opportunity to study possible affect of lifelong contaminant exposure in wild populations of landlocked Arctic charr ( Salvelinus alpinus). This is because Lake Ellasjøen has persistent organic pollutant (POP) levels...

  • An Overview of Effects of Climate Change on Selected Arctic Freshwater and Anadromous Fishes. Reist, James D.; Wrona, Frederick J.; Prowse, Terry D.; Power, Michael; Dempson, J. Brian; King, Jacquelynne R.; Beamish, Richard J. // AMBIO - A Journal of the Human Environment;Nov2006, Vol. 35 Issue 7, p381 

    Arctic freshwater and diadromous fish species will respond to the various effects of climate change in many ways. For wide-ranging species, many of which are key components of northern aquatic ecosystems and fisheries, there is a large range of possible responses due to inter-and intra-specific...

  • The Effect of Anadromous Arctic Charr (Salvelinus alpinus) on Food Web Structure and Contaminant Concentrations in Coastal Arctic Lakes. Swanson, Heidi K. // Arctic;Dec2007, Vol. 60 Issue 4, p452 

    The article focuses on the effect of anadromous arctic charr or Salvelinus alpinus on food web structure and the contaminant concentrations in coastal Arctic Lakes. It discusses the life cycle of anadromous arctic charr in freshwater lakes including their migration in the area, the food they eat...

  • Swimming upstream: Arctic char should net a larger audience. Fabricant, Florence // Nation's Restaurant News;6/17/96, Vol. 30 Issue 24, p29 

    Focuses on the growing popularity of arctic char used as a delicacy in the United States. Wild anadromous fish as the best arctic char; Arctic char served at the Beaver Club in Montreal, Quebec; Preferred size for cooking; Ways of preparing arctic char.

  • Far off the beaten track. Robinson, Jerome B. // Field & Stream;Mar1993, Vol. 97 Issue 11, p50 

    Discusses char fishing in the icy rivers along the arctic coast of Quebec in Canada. Changing tides and the waters of Ungava Bay; Description of the arctic char; Dependability of the char fishery; The Inuit people; Char returning to freshwater rivers to prepare for spawning; Snagging fish...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics