Morphometric analysis of two ecologically distinct forms of Arctic charr, <i>Salvelinus alpinus</i> (L.), in Loch Rannoch, Scotland

Gardner, Alex; Walker, Andrew; Greer, R. B.

doi:10.1111/j.1095-8649.1988.tb05433.x

Cited by 36 publications

(25 citation statements)

References 10 publications

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“…Head shape has a high level of functional significance and is critical in the detection, capture and consumption of prey items. It has been shown to be correlated strongly with diet (Gardner et al, 1988;Adams and Huntingford, 2002 (Thompson et al, 2008), but this study used non-selected microsatellite markers and cannot be used as evidence of selection. Lastly, plastic effects following translocation of fish species have often been described (Loch, 1974;Shields and Underhill, 1993;Lema and Nevitt, 2006), and cannot be ruled out as a major mechanism causing the differences between the populations in this study.…”

Section: Discussionmentioning

confidence: 92%

Morphological and ecological responses to a conservation translocation of powan (Coregonus lavaretus) in Scotland

Etheridge

Bean

Maitland

et al. 2010

Aquatic Conservation

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ABSTRACT1. The establishment of refuge populations has become a common management tool for threatened fish species in recent years, yet the effects of translocation are not fully understood in a conservation context.2. This paper examines the hypothesis that phenotypic changes have occurred during the formation of two refuge populations of the nationally rare powan (a freshwater fish species) which were established in Loch Sloy and Carron Valley Reservoir in Scotland.3. Significant differences in head morphology, size and growth between the founder and refuge populations and between the two refuge populations were demonstrated. These changes are probably due to a combination of founder effects, intense selection and phenotypic plasticity. These changes can undermine the rationale behind the establishment of refuge populations.4. The results call into question the usefulness of translocation as a conservation measure; however, there are times when this is the only viable management option available. The future of translocation and the validity of establishing refuge populations for powan conservation are discussed.

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Section: Discussionmentioning

confidence: 92%

Morphological and ecological responses to a conservation translocation of powan (Coregonus lavaretus) in Scotland

Etheridge

Bean

Maitland

et al. 2010

Aquatic Conservation

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“…It has been concluded that the occurrence of charr variants, both between and within localities, expresses the outcome of adaptive radiation (Jonsson & Jonsson 2001), a phenomenon usually regarded as a first phase of speciation process (Skú lason & Smith 1995;Skarstein et al 2005). So far, comparative morphological studies conducted on Arctic charr have usually concentrated on coexisting (sympatric) morphs (e.g., Gardner et al 1988;Gíslason et al 1999;Adams & Huntingford 2002). So far, comparative morphological studies conducted on Arctic charr have usually concentrated on coexisting (sympatric) morphs (e.g., Gardner et al 1988;Gíslason et al 1999;Adams & Huntingford 2002).…”

Section: Introductionmentioning

confidence: 99%

Morphological variability among three geographically distinct Arctic charr (Salvelinus alpinus L.) populations reared in a common hatchery environment

Janhunen

Peuhkuri²,

Piironen³

2009

Ecology of Freshwater Fish

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Janhunen M, Peuhkuri N, Piironen J. Morphological variability among three geographically distinct Arctic charr (Salvelinus alpinus L.) populations reared in a common hatchery environment.Abstract -The morphology of three lake-resident Arctic charr, Salvelinus alpinus, populations was studied at two life-history stages in a commongarden experiment. The fish of the same year class were reared under standard hatchery conditions, and 27 morphometric variables (a truss network) were measured from the sampled individuals. Most of the total variation was explained by the overall body robustness, dimensions of the head and caudal peduncle length. After controlling for a body size, significant heterogeneity in body shape was found among populations at both ages. Independent of age, the populations were morphologically highly distinct, although some integration of characters could be found as the fish reached sexual maturity. Sexual divergence accounted for a large part of the within-population shape variation, the mature males having more robust bodies, larger head dimensions and longer pectoral fins compared with the mature females ⁄ immature fish. Although the cultured fish may not be totally representative of their wild counterparts, it is reasonable to expect that the observed morphological differences have a genetic basis, presumably reflecting adaptation to local environmental conditions experienced by the charr in their original habitat.

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“…For example, in Loch Rannoch, Scotland, there are two ecologically distinct morphs, one pelagic and one benthic. These two morphs show differences in head size, head shape, colour, parr marks and diet (Gardner et al ., 1988; Walker et al ., 1988). There are also genetic differences between the two morphs (Hartley et al ., 1992), which are believed to be reproductively isolated with different spawning sites and seasons (Gardner et al ., 1988).…”

Section: Discussionmentioning

confidence: 99%

Spawning colouration, parasites and habitat selection in Salvelinus alpinus: initiating speciation by sexual selection?

Skarstein

Folstad

Rønning

2005

Journal of Fish Biology

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The relationship between parasite infection and breeding ornamentation in an Arctic charr Salvelinus alpinus population was examined. Interrelationships between the intensities of parasites with different dietary transmission routes suggested that hosts were segregated by habitat and diet preferences. That is, intensities of parasites transmitted through intermediate hosts that share habitat were, in both sexes, positively interrelated. Negative interrelationships in the intensities of parasites transmitted through different hosts were found only in females. The intensity of breeding colouration was positively correlated with intensities of amphipod-transmitted parasites in both sexes. Intensities of parasites transmitted through copepods showed no relationship to morphological or ornamental characters. Seen in the context of morphology and ornaments of previously described sympatric populations of Arctic charr, these relationships suggested that individual variation in niche background may provide a source for the initial variation in morphology and secondary sexual traits leading to sympatric speciation through sexual selection. # 2005 The Fisheries Society of the British Isles

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Morphometric analysis of two ecologically distinct forms of Arctic charr, Salvelinus alpinus (L.), in Loch Rannoch, Scotland

Cited by 36 publications

References 10 publications

Morphological and ecological responses to a conservation translocation of powan (Coregonus lavaretus) in Scotland

Morphological and ecological responses to a conservation translocation of powan (Coregonus lavaretus) in Scotland

Morphological variability among three geographically distinct Arctic charr (Salvelinus alpinus L.) populations reared in a common hatchery environment

Spawning colouration, parasites and habitat selection in Salvelinus alpinus: initiating speciation by sexual selection?

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