Latitudinal variation in growth among Arctic charr in eastern North America: evidence for countergradient variation?

Chavarie, Louise; Dempson, J. Brian; Schwarz, Carl; Reist, James D.; Power, G.; Power, Michael

doi:10.1007/s10750-009-0043-z

Cited by 42 publications

(46 citation statements)

References 64 publications

(103 reference statements)

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“…As anticipated L F10 was negatively correlated with latitude (r = −0.34, F = 6.40, n = 52, p = 0.01) with growth rates decreasing to the north (Fig. 8); this also was observed by Chavarie et al (2010) for char but is a common feature of fish populations (Scott and Crossman, 1998). Amadjuak Lake anadromous char had low growth rates for their latitude (65°N); this lake discharges into Nettilling Lake and char migrating seaward have a long migration route which may reduce their net energy gain when compared to char inhabiting similar latitudes where the migration route is shorter.…”

Section: Factors Affecting Spatial Variation In Anadromous Char Hg Cosupporting

confidence: 77%

Anadromous char as an alternate food choice to marine animals: A synthesis of Hg concentrations, population features and other influencing factors

Evans

Muir

Keating

et al. 2015

Science of The Total Environment

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Section: Factors Affecting Spatial Variation In Anadromous Char Hg Cosupporting

confidence: 77%

Anadromous char as an alternate food choice to marine animals: A synthesis of Hg concentrations, population features and other influencing factors

Evans

Muir

Keating

et al. 2015

Science of The Total Environment

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“…For example, in the northern hemisphere, many organisms at northern latitudes have larger body sizes, increased longevity and delayed sexual maturation and these traits typically scale with declining latitude [100], [101]. These patterns are rarely examined at microgeographic scales in poikilothermic animals (but see [14], [102]–[104].…”

Section: Discussionmentioning

confidence: 99%

Rapid Life-History Diversification of an Introduced Fish Species across a Localized Thermal Gradient

et al. 2014

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Climatic variations are known to engender life-history diversification of species and populations at large spatial scales. However, the extent to which microgeographic variations in climate (e.g., those occurring within a single large ecosystem) can also drive life-history divergence is generally poorly documented. We exploited a spatial gradient in water temperatures at three sites across a large montane lake in southwest China (Lake Erhai) to examine the extent to which life histories of a short-lived fish species (icefish, Neosalanx taihuensis) diversified in response to thermal regime following introduction 25 y prior. In general, warmwater icefish variants grew faster, had larger adult body size and higher condition and fecundity, but matured at smaller sizes. Conversely, coldwater variants had smaller adult body size and lower condition, but matured at larger sizes and had larger eggs. These life-history differences strongly suggest that key ecological trade-offs exist for icefish populations exposed to different thermal regimes, and these trade-offs have driven relatively rapid diversification in the life histories of icefish within Lake Erhai. Results are surprisingly concordant with current knowledge on life-history evolution at macroecological scales, and suggest that improved conservation management might be possible by focusing on patterns operating at microgeographical, including, within-ecosystem scales.

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“…An increasingly popular (but less rigorous) alternative is to test for CGG by observing growth in the field, correcting for the thermal opportunity for growth, and then regressing corrected growth against latitude (e.g., Power and McKinley 1997;Conover et al 2009;Chavarie et al 2010). A positive relationship is considered evidence for CGG.…”

Section: Introductionmentioning

confidence: 99%

Fish growth and degree-days II: selecting a base temperature for an among-population study

Chezik

Lester

Venturelli

2014

Can. J. Fish. Aquat. Sci.

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The degree-day (DD) is a method of describing the thermal opportunity for growth and development and is becoming increasingly popular when comparing fish growth over large spatial scales (e.g., counter-gradient growth). Temperatures too cold to permit growth are excluded in the DD equation by incorporating a lower temperature threshold (T o ). However, there is no convention for choosing T o , and unknown is the effect of an incorrect T o on how growth is perceived. We simulate data to demonstrate how an incorrect T o may lead to differences in temperature-corrected growth rates among populations. These differences increase with the error in T o and the thermal range among simulated populations. We then show the same relationships in an analysis of length-at-age data from 81 walleye (Sander vitreus) populations in North America. Together, our results demonstrate that differences in temperature-corrected growth rates among populations can be a statistical artifact rather than a biological phenomenon, especially when populations are distributed over a large thermal gradient. Résumé :La méthode des degrés-jour (DJ), utilisée pour décrire les possibilités de croissance et de développement selon la température, est de plus en plus employée pour comparer la croissance des poissons sur de grandes étendues (p. ex. croissance à contre-gradient). Les températures trop basses pour permettre la croissance sont exclues de l'équation des DJ en incorporant un seuil de température minimum (T o ). Il n'existe toutefois aucune convention sur le choix de la valeur de T o , et l'effet d'une T o incorrecte sur la perception de la croissance est inconnu. Nous simulons des données afin de démontrer comment une T o incorrecte peut mener à des différences entre populations sur le plan des taux de croissance corrigés pour la température. Plus l'erreur associée à T o et la fourchette de températures pour les populations simulées sont grandes, plus ces différences sont importantes. Nous démontrons ensuite l'existence des mêmes relations dans une analyse de données de longueur selon l'âge pour 81 populations de dorés jaunes (Sander vitreus) en Amérique du Nord. Collectivement, nos résultats démontrent que des différences entre populations sur le plan des taux de croissance corrigés pour la température peuvent être des artefacts statistiques plutôt que le produit d'un phénomène biologique, particulièrement dans le cas de populations réparties le long d'un important gradient thermique. [Traduit par la Rédaction]

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Latitudinal variation in growth among Arctic charr in eastern North America: evidence for countergradient variation?

Cited by 42 publications

References 64 publications

Anadromous char as an alternate food choice to marine animals: A synthesis of Hg concentrations, population features and other influencing factors

Anadromous char as an alternate food choice to marine animals: A synthesis of Hg concentrations, population features and other influencing factors

Rapid Life-History Diversification of an Introduced Fish Species across a Localized Thermal Gradient

Fish growth and degree-days II: selecting a base temperature for an among-population study

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