Use of otolith microchemistry and stable isotopes to investigate the ecology and anadromous migrations of Northern Dolly Varden from the Egegik River, Bristol Bay, Alaska

Hart, Lindsay M.; Bond, Morgan H.; May-McNally, Shannan L.; Miller, Jessica A.; Quinn, Thomas P.

doi:10.1007/s10641-015-0389-1

Cited by 18 publications

(10 citation statements)

References 54 publications

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“…Dolly Varden (e.g. Armstrong, 1974;Bond et al, 2014;Hart, Bond, May-McNally, Miller, & Quinn, 2015) and Arctic charr Salvelinus alpinus (e.g. Klementsen et al, 2003) exhibit a vast array of life histories, which differ in duration of freshwater and/or marine rearing, age at maturation and incidence of repeat spawning etc.…”

Section: Discussionmentioning

confidence: 99%

Parr dispersal between streams via a marine environment: A novel mechanism behind straying for anadromous brown trout?

Taal

Rohtla

Saks

et al. 2017

Ecology of Freshwater Fish

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Otolith Sr:Ca profiles demonstrated that juvenile anadromous brown trout (ABT) Salmo trutta may descend to the brackish waters of the Baltic Sea from their natal streams as parr or fry and then migrate into non-natal streams before transforming into smolt. To our knowledge, no such published documentation exists for ABT. The ecological significance of this life-history strategy is presently not clear. However, stream shifting through the marine environment should to be considered with regard to stock management and the assessment and restoration of salmonid populations and their potential habitats. K E Y W O R D Slife history, otolith microchemistry, parr migration, salmonids

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Section: Discussionmentioning

confidence: 99%

Parr dispersal between streams via a marine environment: A novel mechanism behind straying for anadromous brown trout?

Taal

Rohtla

Saks

et al. 2017

Ecology of Freshwater Fish

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“…2008 and Hart et al. 2015 for details). Learning samples of Arctic char and Dolly Varden were assigned to species using a combination of morphology, biogeography, and diagnostic microsatellite markers (see below).…”

Section: Methodsmentioning

confidence: 99%

“…Tests for departures from Hardy-Weinberg equilibrium (HWE) for each locus-locality combination were performed with GENEPOP ver 4.2 (Raymond and Rousset 1995) using an exact test in which probability values were determined using a Markov chain method (P) controlling for multiple tests as per Narum (2006). To obtain a general assessment of the number and distinction of genetic groups in Lake Aleknagik and Lake Nerka without a priori assignment to taxon, we conducted a factorial correspondence analysis (FCA) in GE-NETIX (Belkhir et al 2001) on allele frequencies across all loci of Lake Aleknagik and Lake Nerka char alone, and with reference populations of allopatric Arctic char from the central Canadian Arctic (N = 43) and a reference sample Dolly Varden (N = 29) from the Egegik fishing district located south of Dillingham and Bristol Bay, Alaska, at the outflow of Becharof Lake (see Taylor et al 2008 andHart et al 2015 for details). Learning samples of Arctic char and Dolly Varden were assigned to species using a combination of morphology, biogeography, and diagnostic microsatellite markers (see below).…”

Section: Statistical Analysis Of Microsatellite Dnamentioning

confidence: 99%

Low levels of hybridization between sympatricArctic char (Salvelinus alpinus) andDollyVarden char (Salvelinus malma) highlights their genetic distinctiveness and ecological segregation

May-McNally

Quinn

Taylor

2015

Ecology and Evolution

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Understanding the extent of interspecific hybridization and how ecological segregation may influence hybridization requires comprehensively sampling different habitats over a range of life history stages. Arctic char (Salvelinus alpinus) and Dolly Varden (S. malma) are recently diverged salmonid fishes that come into contact in several areas of the North Pacific where they occasionally hybridize. To better quantify the degree of hybridization and ecological segregation between these taxa, we sampled over 700 fish from multiple lake (littoral and profundal) and stream sites in two large, interconnected southwestern Alaskan lakes. Individuals were genotyped at 12 microsatellite markers, and genetic admixture (Q) values generated through Bayesian-based clustering revealed hybridization levels generally lower than reported in a previous study (<0.6% to 5% of samples classified as late-generation hybrids). Dolly Varden and Arctic char tended to make different use of stream habitats with the latter apparently abandoning streams for lake habitats after 2–3 years of age. Our results support the distinct biological species status of Dolly Varden and Arctic char and suggest that ecological segregation may be an important factor limiting opportunities for hybridization and/or the ecological performance of hybrid char.

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“…Given the complete separation between the migratory histories of these samples, selected "blind" with respect to any information on their parents, it seems likely that the Dolly Varden in this system, or at least the females, are primarily anadromous (cf. Hart et al 2015), and the Arctic char are primarily resident. This conclusion is consistent with the results of other forms of sampling with beach seines, gill nets, and hook and line (Taylor et al 2008;May-McNally et al 2015a), all of which can produce large-bodied Arctic char throughout the summer in this system, whereas adult-sized Dolly Varden are seldom encountered until the fall during what is presumably their upstream migration from the sea.…”

Section: Differences In Migratory Life Historymentioning

confidence: 99%

Trophic biology and migratory patterns of sympatric Dolly Varden (Salvelinusmalma) and Arctic char (Salvelinusalpinus)

et al. 2016

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The trophic ecology (diet and head morphology) and migration patterns of two closely related salmonid fishes, Arctic char (Salvelinus alpinus (L., 1758)) and Dolly Varden (Salvelinus malma (Walbaum, 1792)), were examined in tributaries of Lake Aleknagik, southwestern Alaska, to test for differentiation between species. Schoener’s index of proportional overlap and multivariate analyses of diets suggested that these species had significantly different trophic niches. Arctic char and the largest individuals of both species had the most diverse diets, and sockeye salmon (Oncorhynchus nerka (Walbaum, 1792)) eggs dominated the diet of both species, especially Arctic char. Arctic char had larger jaws and wider heads than Dolly Varden of similar body length, which may contribute to interspecific diet difference. The species also differed in migration patterns; otolith microchemistry indicated that juvenile Arctic char were produced by nonanadromous mothers, whereas the mothers of the Dolly Varden had been to sea in the season prior to spawning. The species also segregate in spawning habitat (Arctic char in the lakes and Dolly Varden in streams), as well as in juvenile rearing habitat. Our study provides the first evidence of divergent feeding and migratory ecology between sympatric juvenile Arctic char and Dolly Varden, differences that may constrain hybridization and introgression between them.

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Use of otolith microchemistry and stable isotopes to investigate the ecology and anadromous migrations of Northern Dolly Varden from the Egegik River, Bristol Bay, Alaska

Cited by 18 publications

References 54 publications

Parr dispersal between streams via a marine environment: A novel mechanism behind straying for anadromous brown trout?

Parr dispersal between streams via a marine environment: A novel mechanism behind straying for anadromous brown trout?

Low levels of hybridization between sympatricArctic char (Salvelinus alpinus) andDollyVarden char (Salvelinus malma) highlights their genetic distinctiveness and ecological segregation

Trophic biology and migratory patterns of sympatric Dolly Varden (Salvelinusmalma) and Arctic char (Salvelinusalpinus)

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