picture of Anthony Gharrett

Anthony Gharrett

Professor Emeritus

Fish and Fisheries Genetics
Fisheries Conservation
Fisheries Systematics
Fisheries Division 325 Lena Point bldg.
17101 Point Lena Loop Rd
Juneau, AK 99801-8344
(907) 796-5445
(907) 796-5447
  • Patrick Barry
  • Wei Cheng
  • Christopher Manhard
  • Katie Palof
  • Noel Sme
M. Garvin, C. Kondzela, P. Martin, B. Finney, J. Guyon, W. Templin, N. DeCovich, S. Gilk-Baumer and A. Gharrett. 2013. Recent physical connections may explain weak genetic structure in western Alaskan chum salmon (Oncorhynchus keta) populations Ecology and Evolution. 3:23622377. doi: 10.1002/ece3.628

D. S. Oxman, W. W. Smoker and A. J. Gharrett. 2013. Developmental progression of gill rakers as a post-hatch developmental marker in pink salmon, Oncorhynchus gorbuscha Environmental Biology of Fishes. 96(5):677-689.

R. P. Kovach, A. J. Gharrett and D. A. Tallmon. 2013. Temporal patterns of genetic variation in a salmon population undergoing rapid change in migration timing Evolutionary Applications. 6(5):795-807.

L. Kamin, K. Palof, J. Heifetz and A. Gharrett. 2013. Interannual and spatial variation in the population genetic composition of young-of-the-year Pacific ocean perch (Sebastes alutus) in the Gulf of Alaska Fisheries Oceanography. doi: 10.1111/fog.12038 doi: 10.1111/fog.12038

A. Gharrett, J. Joyce and W. Smoker. 2013. Fine-scale temporal adaptation within a salmonid population: Mechanism and consequences Molecular Ecology Resources. 22:4457-4469.

D. S. Oxman, W. W. Smoker and A. J. Gharrett. 2012. Developmental progression of gill rakers as a post-hatch developmental marker in pink salmon, Oncorhynchus gorbuscha Environmental Biology of Fishes. 0:13-Jan. doi: 10.1007/s10641-012-0058-6

R. P. Kovach, A. J. Gharrett and D. A. Tallmon. 2012. Genetic change for earlier migration timing in a pink salmon population Proceedings of the Royal Society B-Biological Sciences. 279(1743):3870-3878.

A. J. Gharrett, R. J. Riley and P. D. Spencer. 2012. Genetic Analysis Reveals Restricted Dispersal of Northern Rockfish along the Continental Margin of the Bering Sea and Aleutian Islands Transactions of the American Fisheries Society. 141(2):370-382.

K. J. Palof, J. Heifetz and A. J. Gharrett. 2011. Geographic structure in Alaskan Pacific ocean perch (Sebastes alutus) indicates limited lifetime dispersal Marine Biology. 158(4):779-792.

M. R. Garvin, J. P. Bielawski and A. J. Gharrett. 2011. Positive Darwinian Selection in the Piston That Powers Proton Pumps in Complex I of the Mitochondria of Pacific Salmon Plos One. 6(9)

M. R. Garvin, R. W. Marcotte, K. J. Palof, R. J. Riley, L. M. Kamin and A. J. Gharrett. 2011. Diagnostic single nucleotide polymorphisms (SNPs) identify Pacific ocean perch and delineate blackspotted and rougheye rockfish. Transaction of the American Fisheries Society. 140:984--988. doi: DOI: 10.1080/00028487.2011.603984

M. R. Garvin, K. Saitoh, D. Y. Churikov, V. A. Brykov and A. J. Gharrett. 2010. Single nucleotide polymorphisms in chum salmon (Oncorhynchus keta) mitochondrial DNA derived from restriction site haplotype information Genome. 53(7):501-507. doi: 10.1139/g10-026 <Go to ISI>://000280731300001

M. R. Garvin and A. J. Gharrett. 2010. Application of single nucleotide polymorphism markers to chum salmon Oncorhynchus keta: discovery, genotyping and linkage phase resolution Journal of Fish Biology. 77(9):2137-2162. doi: 10.1111/j.1095-8649.2010.02828.x <Go to ISI>://000285010200007

M. R. Garvin, K. Saitoh and A. J. Gharrett. 2010. Application of single nucleotide polymorphisms to non-model species: a technical review Molecular Ecology Resources. 10(6):915-934. doi: 10.1111/j.1755-0998.2010.02891.x <Go to ISI>://000282876300001

T. H. Dann, W. W. Smoker, J. J. Hard and A. J. Gharrett. 2010. Outbreeding Depression after Two Generations of Hybridizing Southeast Alaska Coho Salmon Populations? Transactions of the American Fisheries Society. 139(4-Jan):1292-1305. doi: 10.1577/t09-203.1 <Go to ISI>://000282594000004

A. R. Whiteley, S. M. Gende, A. J. Gharrett and D. A. Tallmon. 2009. Background matching and color-change plasticity in colonizing freshwater sculpin populations following rapid deglaciation Evolution. 63(15191529)

C. Kondzela, M. Garvin, E. Riley, J. Murphy, J. Moss, S. A. Fuller and A. J. Gharrett. 2009. Preliminary genetic analysis of juvenile chum salmon from the Chukchi Sea and Bering Strait North Pacific Anadromous Fish Commission Bulletin . 5:25-27.

N. Y. Shpigalskaya, V. A. Brykov, A. J. Gharrett, A. D. Kukhlevsky, R. A. Shaporev and N. V. Varnavskaya. 2008. Variation of mitochondrial DNA in chinook salmon Oncorhynchus tschawytscha Walbaum populations from Kamchatka Russian Journal of Genetics. 44(7):849-858. doi: Doi 10.1134/S1022795408070132 <Go to ISI>://000258290300013

  • population genetics of salmon and rockfish
Research Overview
Genetics is important in both the management and culture of fishes as well as for understanding their biology and evolution. Populations are molded by the environments, or series of environments, to which they are exposed. Natural selection favors traits that optimize their survival and production; and, consequently, populations become "locally adapted" and tend to diverge genetically from other populations. Divergence often increases over geographic distance. One consequence of local adaptation is that translocations and hatchery strays may jeopardize locally pre-adapted populations. Our research has examined the effect on survival and other "fitness" characteristics of hybridizing genetically distinct populations. We have documented "outbreeding depression" in hybrids between spatially separated pink salmon populations and are now looking at seasonally separated populations. The geographic distribution of genetic variation in species provides a means to track the recent (evolutionary scale) post-Pleistocene colonization of salmon and even marine species. We have conducted phylogeographic studies of both salmon and rockfish species. Moreover, persistence of geographically-based genetic structure under geographic or oceanographic conditions in which one would expect wide dispersal of pelagic larvae and juveniles or long-lived adults is evidence of limited dispersal. That geographic scale of that structure should provide managers with guidance for management area size. Managing at larger scales risks local depletions. Unique heritable characteristics may define a population or group of populations in a geographic region. Recently, western Alaskan chum salmon returns have declined. At the same time, global climate change has affected both freshwater and marine habitats in Alaska, the pollock fishery has captured incidentally large numbers of chum salmon and many Asian chum salmon migrate through the eastern Bering Sea. To understand the causes(s) of the decline, the origins of salmon intercepted in marine waters must be determined. We are currently participating in developing species-wide genetic information on chum salmon populations that can provide markers needed to determine natal origins. Recent advances in DNA technology have introduced new, powerful techniques for resolving genetic differences in mitochondrial DNA and nuclear DNA sequences. We are currently developing methods and markers to improve DNA sequence-based methods to investigate salmon and rockfish population and evolutionary genetics.
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