Page Banner

United States Department of Agriculture

Agricultural Research Service

John F. Gaskin

Supervisory Research Biologist


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
First Report of Rhizoctonia spp. causing a root rot of the invasive rangeland weed Lepidium draba in North America. - (Peer Reviewed Journal)
Caesar, A.J., Lartey, R.T., Caesar, T., Gaskin, J.F. 2014. First report of Rhizoctonia spp. causing a root rot of the invasive rangeland weed Lepidium draba in North America. Plant Disease Notes. 98(9):1278. DOI: 10.1094/PDIS-03-14-0300-PDN.
Soil-aggregating bacterial community as affected by irrigation, tillage, and cropping system in the Northern Great Plains - (Peer Reviewed Journal) - (28-Mar-14)
Soil-aggregating bacterial community as affected by irrigation, tillage, and cropping system in the Northern Great Plains Reprint Icon - (Peer Reviewed Journal)
Caesar, T., Stevens, W.B., Sainju, U.M., Caesar, A.J., West, M.S., Gaskin, J.F. 2014. Soil-aggregating bacterial community as affected by irrigation, tillage, and cropping system in the Northern Great Plains. Soil Science. 179(1):11-20.
Extreme differences in population structure and genetic diversity for three invasive congeners: knotweeds in western North America - (Peer Reviewed Journal)
Gaskin, J.F., Schwarzlaender, M., Grevstad, F., Haverhals, M., Bourchier, R., Miller, T. 2014. Extreme differences in population structure and genetic diversity for three invasive congeners: knotweeds in western North America. Biological Invasions. 16(10):2127–2136. DOI: 10.1007/s10530-014-0652-y.
Hybridization of an invasive shrub affects tolerance and resistance to defoliation by a biological control agent Reprint Icon - (Peer Reviewed Journal)
Williams, W., Friedman, J., Gaskin, J.F., Norton, A. 2014. Hybridization of an invasive shrub affects tolerance and resistance to defoliation by a biological control agent. Evolutionary Applications. 7(3):381-393.
Propagule pressure, genetic structure, and geographic origins of Chondrilla juncea (Asteraceae): An apomictic invader on three continents Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Schwarzlaender, M., Kinter, L., Smith, J., Novak, S. 2013. Propagule pressure, genetic structure, and geographic origins of Chondrilla juncea (Asteraceae): An apomictic invader on three continents. American Journal of Botany. 100(9):1871–1882.
Use of wheat SSRs to assess genetic diversity in medusahead (Taenintherum caput-medusae) - (Peer Reviewed Journal)
Rector, B.G., Ashley, M.C., Gaskin, J.F., Longland, W.S. 2013. Use of wheat SSRs to assess genetic diversity in medusahead (Taenintherum caput-medusae). Invasive Plant Science and Management. 6:352-361.
Effects of agaricus lilaceps fairy rings on soil aggregation and microbial community structure in relation to growth stimulation of western wheatgrass (pascopyrum smithii) in Eastern Montana rangeland Reprint Icon - (Peer Reviewed Journal)
Caesar, T., Espeland, E.K., Caesar, A.J., Sainju, U.M., Lartey, R.T., Gaskin, J.F. 2013. Effects of agaricus lilaceps fairy rings on soil aggregation and microbial community structure in relation to growth stimulation of western wheatgrass (pascopyrum smithii) in Eastern Montana rangeland. Microbial Ecology. 66(1): 120-131.
Genetic identity and diversity of perennial pepperweed (Lepidium latifolium) in its native and invaded ranges Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Schwartzlander, M., Hinz, H., Williams III, L.H., Gerber, E., Rector, B.G., Zhang, D. 2013. Genetic identity and diversity of perennial pepperweed (Lepidium latifolium) in its native and invaded ranges. Journal of Invasive Plant Science and Management. 6(2):268–280.
The genetics of Tamarix - (Book / Chapter)
Gaskin, J.F. 2013. The genetics of Tamarix. In: Sher, A. and Quigley, M.F. A Case Study of Ecological Change in the American West: Tamarix. New York, NY: Oxford University Press. p. 21-28.
Molecular genetic and hybridization studies of Diorhabda spp. released for biological control of tamarix Reprint Icon - (Peer Reviewed Journal)
Bean, D., Kazmer, D.J., Gardner, K., Thompson, D., Reynolds, B., Keller, J.C., Gaskin, J.F. 2013. Molecular genetic and hybridization studies of Diorhabda spp. released for biological control of tamarix. Journal of Invasive Plant Science and Management. 6(1): 1-15.
Effects of biodegradable plastics on the predominant culturable bacteria associated with soil aggregate formation and stability after 9 months of incubation in natural soil - (Abstract Only) - (04-Apr-12)
Minimal genetic diversity in the facultatively outcrossing perennial pepperweed (Lepidium latifolium) invasion Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Schwarzlaender, M., Williams, L., Gerber, E., Hinz, H. 2012. Minimal genetic diversity in the facultatively outcrossing perennial pepperweed (Lepidium latifolium) invasion. Biological Invasions. 14:1797–1807. Available: DOI.10.1007/s10530-012-0190-4.
Bootstrap estimation and comparison of an index of phylogenetic correlation - (Proceedings) - (04-Jan-12)
Levels of novel hybridization in the saltcedar invasion compared over seven decades Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Birken, A.S., Cooper, D.J. 2012. Levels of novel hybridization in the saltcedar invasion compared over seven decades. Biological Invasions. 14(3):693–699.
How many species of Salsola tumbleweeds (Russian thistle) occur in the Western USA? - (Abstract Only) - (11-Sep-11)
Relationships of host plant phylogeny, chemistry and host plant specificity of several agents of yellow starthistle - (Abstract Only) - (11-Sep-11)
Breeding system and its consequence on fruit set of a rare sand dune shrub Eremosparton songoricum (Fabaceae: Papilionoideae): implications for conservation Reprint Icon - (Peer Reviewed Journal)
Zhang, D., Shi, X., Wang, J., Liu, H., Gaskin, J.F. 2011. Breeding system and its consequence on fruit set of a rare sand dune shrub Eremosparton songoricum (Fabaceae: Papilionoideae): implications for conservation. Journal of Arid Land. 3(4):231-239.
Russian olive – a suitable target for classical biological control in North America? - (Abstract Only)
Delaney, K.J., Espeland, E.K., Norton, A., Sing, S., Keever, K., Baker, J., Cristofaro, M., Jashenko, R., Gaskin, J.F., Schaffner, U. 2011. Russian olive – a suitable target for classical biological control in North America? In: Y. Wu., T. Johnson, S. Sing, S. Raghu, G. Wheeler, P. Pratt, K. Warner, T. Center, J. Goolsby, R. Reardon, editors. Proceedings of the XIII International Symposium on Biological Control of Weeds, September 11–16, 2011, Waikaloa, Hawaii. USA. USDA-FS-FHTET, USA, p. 352.
Applying molecular-based approaches to classical biological control of weeds Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Bon, M.C., Cock, M.J.W., Cristofaro, M., De Biase, A., De Clerck-Floate, R., Ellison, C.A., Hinz, H., Hufbauer, R., Julien, M., and Sforza, R. 2011. Applying molecular-based approaches to classical biological control of weeds. Biological Control. 58:1–21.
Reevaluating establishment and potential hybridization of different biotypes of the biological control agent Longitarsus jacobaeae using molecular tools Reprint Icon - (Peer Reviewed Journal)
Szucs, M., Swarzlaender, M., Gaskin, J.F. 2011. Reevaluating establishment and potential hybridization of different biotypes of the biological control agent Longitarsus jacobaeae using molecular tools. Biological Control. 58:44-52.
Pollen source and resource limitation to fruit production in the rare species Eremosparton songoricum (Fabaceae) Reprint Icon - (Peer Reviewed Journal)
Shi, X., Wang, J., Dao-Yuan, Z., Gaskin, J.F., Pan, B. 2010. Pollen source and resource limitation to fruit production in the rare species Eremosparton songoricum (Fabaceae). Nordic Journal of Botany. 28: 438-444.
Six Species of Salsola tumbleweeds (Russian thistle) in the Western USA and Prospects for their Control - (Abstract Only)
Smith, L., Hrusa, G., Gaskin, J.F., Bruckart, W.L., Berner, D.K., Cristofaro, M. 2010. Six Species of Salsola tumbleweeds (Russian thistle) in the Western USA and Prospects for their Control. Weed Science Society of America Meeting Abstracts.
Pollination ecology of the rare desert species Eremosparton songoricum (Fabaceae Reprint Icon - (Peer Reviewed Journal)
Shi, X., Wang, J., Zhang, D., Gaskin, J.F., Pan, B. 2010. Pollination ecology of the rare desert species Eremosparton songoricum (Fabaceae. Australian Journal of Botany. 58(1): 35–41.
Ecology and management of Sheoak (Casuarina spp.), an invader of coastal Florida, U.S.A. Reprint Icon - (Peer Reviewed Journal)
Wheeler, G.S., Taylor, G.S., Gaskin, J.F., Purcell, M. 2011. Ecology and management of Australian pine (Casuarina spp.), an invader of coastal Florida, USA. Journal of Coastal Research. 27(3):485-492.
Effects of tillage on microbial populations associated to soil aggregates under dryland spring wheat system Reprint Icon - (Peer Reviewed Journal)
Caesar, T., Lenssen, A.W., Caesar, A.J., Sainju, U.M., Gaskin, J.F. 2010. Effects of tillage on microbial populations associated to soil aggregates under dryland spring wheat system. European Journal of Soil Biology. 46:119-127.
Evolution and Pesticide Resistance: Examining Quantitative Trends Visually - (Book / Chapter)
Braude, S., Gaskin, J.F. 2010. Evolution and Pesticide Resistance: Examining Quantitative Trends Visually. In: Bradue, S. and Low, B.S., editors. An Introduction to Methods and Models in Ecology, Evolution, and Conservation Biology. Princeton, NJ: Princeton University Press. p. 3-11.
Rush Skeletonweed (Chondrilla Juncea) Management Plan for the Western United States - (Book / Chapter)
Gaskin, J.F. 2009. Rush Skeletonweed (Chondrilla Juncea) Management Plan for the Western United States. In: Rachel, W., Schwarzlander, M., Gaskin, J.F., Crabtree, C., editors. 1st Edition. Fort Collins, CO: Forest Health Technology Enterprise Team. pp. 117.
Molecular evidence of hybridization in Florida's sheoak (Casuarina spp.) invasion Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Wheeler, G.S., Purcell, M., Taylor, G. 2009. Molecular evidence of hybridization in Florida's sheoak (Casuarina spp.) invasion. Molecular Ecology. 18(15):3216-3226.
Genotypic diversity of Beauveria bassiana isolates in Acridids from the Northern Plains of the United States - (Abstract Only) - (01-May-09)
Species of Salsola (Russian thistle) in the Western USA and Prospects for Biological Control - (Abstract Only) - (31-Dec-08)
Morphological variation and chromosome studies of Calligonum mongolicum and C. pumilum (polygonaceae) Reprint Icon - (Peer Reviewed Journal)
Shi, W., Pan, B., Gaskin, J.F., Kang, X. 2009. Morphological Variation and Chromosome Studies of Calligonum mongolicum and C. pumilum (Polygonaceae). Nordic Journal of Botany. 27(2):81-85.
Latitudinal variation in cold hardiness in introduced Tamarix and native Populus Reprint Icon - (Peer Reviewed Journal)
Friedman, J., Rolle, J., Gaskin, J.F., Pepper, A., Manhart, J. 2008. Latitudinal variation in cold hardiness in introduced Tamarix and native Populus. Evolutionary Applications. 1(4):598-607.
Effects of Polyacrylamide and Organic Matter on Microbes associated to Soil Aggregation of Norfolk Loamy Sand Reprint Icon - (Peer Reviewed Journal)
Caesar, T., Busscher, W.J., Novak, J.M., Gaskin, J.F., Kim, Y. 2008. Effects of Polyacrylamide and Organic Matter on Microbes associated to Soil Aggregation of Norfolk Loamy Sand. Applied Soil Ecology. 40(2):240-249.
The Salsola tragus Complex in California (Chenopodiaceae): Characterization and Status of Salsola australis and the Autochthonous Allopolyploid Salsola ryanii Sp. Nov Reprint Icon - (Peer Reviewed Journal)
Hrusa, F., Gaskin, J.F. 2008. The Salsola tragus Complex in California (Chenopodiaceae): Characterization and Status of Salsola australis and the Autochthonous Allopolyploid Salsola ryanii Sp. Nov. Madrono. 55(2):113-131.
Lepidium in Flora of North America Reprint Icon - (Book / Chapter)
Al-Shehbaz, I., Gaskin, J.F. 2010. Lepidium. In: Boufford, D., Freeman, C., Gandhi, K., Hill, M., Kiger, R., Poole, J., Schmidt, H., Shultz, L., Strother, J. and Zarucchi, J., editors. Flora of North America. New York, New York, Oxford University Press, Inc. 7:570-595.
Especies del género Tamarix (Tamaricaceae) invadiendo ambientes naturales y seminaturales en Argentina - (Peer Reviewed Journal)
Natale, E.S., Gaskin, J.F., Zalba, S.M., Celballos, M., Reinoso, H.E. 2008. Especies del género Tamarix (Tamaricaceae) invadiendo ambientes naturales y seminaturales en Argentina. Boletín de la Sociedad Argentina de Botánica. 43(1-2):1-9.
Tumbleweed (Salsola, secion Kali) species and speciation in California Reprint Icon - (Peer Reviewed Journal)
Ayres, D., Ryan, F.J., Grotkopp, E., Bailey, J., Gaskin, J.F. 2008. Tumbleweed (Salsola, secion Kali) Species and Speciation in California. Biological Invasions. 11(5):1175-1187.
Introgression between saltcedars (Tamarix chinensis and T. ramosissima) in the USA invasion Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Kazmer, D.J. 2009. Introgression between saltcedars (Tamarix chinensis and T. ramosissima) in the USA invasion. Biological Invasions. 11(5):1121-1130.
Ecological genetics of plant invasion: What do we know? Reprint Icon - (Peer Reviewed Journal)
Ward, S., Gaskin, J.F., Wilson, L. 2008. Ecological genetics of plant invasion: What do we know? Journal of Invasive Plant Science and Management. 1:98-109.
Ecology and function of culturable microbes in soil aggregation - (Book / Chapter)
Caesar, T., Caesar, A.J., Gaskin, J.F., Sainju, U.M., Stevens, W.B. 2008. Ecology and function of culturable microbes in soil aggregation. In: Tian-Xiao Liu, editor. Soil Ecology Research Developments. Hauppauge, NY:2007 Science Publishers, Inc. p. 121-138.
Does phylogeny explain the host choice behaviour of potential biological control agents for Brassicaceae weeds? - (Proceedings)
Hinz, H.L., Schwarzlander, M., Gaskin, J.F. 2008. Does Phylogeny Explain the Host -Choice Behaviour of Potential Biological Control Agents for Brassicaceae Weeds? Biological Control Symposium Proceedings. p. 410-417.
Double trouble for grasshopper molecular systematics: intra-individual heterogeneity of both mitochondrial 12S-valine-16S and nuclear internal transcribed spacer ribosomal DNA sequences in Hesperotettix viridis Reprint Icon - (Peer Reviewed Journal)
Sword, G.A., Senior, L., Gaskin, J.F., Joern, A. 2007. Double trouble for grasshopper molecular systematics: intra-individual heterogeneity of both mitochondrial 12S-valine-16S and nuclear internal transcribed spacer ribosomal DNA sequences in Hesperotettix viridis (Orthoptera: Acrididae). Systematic Entomology. 32(3):420-428.
Tamaricaeceae Reprint Icon - (Book / Chapter)
Qiner, Y., Gaskin, J.F. 2006. Tamaricaeceae. In: Zhengyi, W., Raven, P.H., Deyuan, H., editors. Flora of China. Beijing: Science Press. 13:58-69.
Taxonomic diversity of predominant culturable bacteria associated with microaggregates from two different agroecosystems and their ability to aggregate soil in vitro Reprint Icon - (Peer Reviewed Journal)
Caesar, T., Caesar, A.J., Gaskin, J.F., Sainju, U.M., Busscher, W.J. 2007. Taxonomic diversity of predominant culturable bacteria associated with microaggregates from two different agroecosystems and their ability to aggregate soil in vitro. Applied Soil Ecology. 36(1):10–21.
Invasion of tamarisk (Tamarix spp.) in a southern California salt marsh Reprint Icon - (Peer Reviewed Journal)
Whitcraft, C.R., Talley, D.M., Crooks, J.A., Boland, J., Gaskin, J.F. 2007. Invasion of tamarisk (Tamarix spp.) in a southern California salt marsh. Biological Invasions. 9(7):875-879.
Phylogenetic Relationships among Native and Naturalized Hieracium (Asteraceae) in Canada and the United States Based on Plastid DNA Sequences Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Wilson, L.M. 2007. Phylogenetic relationships among native and naturalized hieracium (asteraceae) in Canada and the United States based on plastid DNA sequences. Systematic Botany. 32(2):478-485.
Comparison of ornamental and invasive saltcedar in the USA northern Great Plains using chloroplast and nuclear DNA sequence markers Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Kazmer, D.J. 2006. Comparison of ornamental and invasive saltcedar in the USA northern Great Plains using chloroplast and nuclear DNA sequence markers. Wetlands. 26(4):939-950.
Taxonomic diversity of predominant bacteria associated with microaggregates from two different agroecosystems and their ability to aggregate soil in vitro - (Abstract Only) - (20-Jun-06)
Isolation and characterization of ten polymorphic microsatellites in saltcedars (Tamarix chinensis and T. ramosissima) Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Pepper, A., Manhart, J. 2006. Isolation and characterization of ten polymorphic microsatellites in saltcedars (Tamarix chinensis and T. ramosissima). Molecular Ecology Notes. 6(4):1147-1149.
Tamaricaceae - (Book / Chapter) - (22-Feb-06)
Tamaricaceae - (Book / Chapter)
Gaskin, J.F. 2012. Tamaricaceae. In: Baldwin, B.G., Goldman, D.H., Keil, DJ, Patterson, R., Rosatti, T.J., Wilken, Dieter, D.H., editors. The Jepson Manual: Vascular Plants of California, Second Edition. Berkeley, CA: University of California Press. pp. 1259-1261.
Systematics position of Myrtama Ovcz. and Kinz. based on mophological and nr DNA ITS sequence evidence Reprint Icon - (Peer Reviewed Journal)
Zhang, D., Zhang, Y., Gaskin, J.F., Chen, Z. 2006. Systematics position of Myrtama Ovcz. and Kinz. based on mophological and nr DNA ITS sequence evidence. Chinese Science Bulletin. 51:117-123.
Clonal Structure of Invasive Hoary Cress (Lepidium Draba) Infestations Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F. 2006. Clonal structure of invasive hoary cress (lepidium draba) infestations. Weed Science. 54(3):428-434.
Smilacaceae in Flora of the Venezuelan Guayana - (Book / Chapter)
Gaskin, J.F. and P.E. Berry. 2005. Smilacaceae in Flora of the Venezuelan Guayana, J.A.Steyermark, P.E. Berry, K. Yatskievych and B.K. Holst (eds.). Missouri Botanical Garden Press, St. Louis, USA. P. 184-193.
Genotype Diversity of Salsola Tragus and Potential Origins of a Previously Unidentified Invasive Salsola from California and Arizona Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Ryan, F.J., Hrusa, G.F. 2006. Genotype diversity of salsola tragus and potential origins of a previously unidentified invasive salsola from california and arizona. Madrono. 53:246-253.
Invasion of Lepidium Draba (Brassicaceae) in the Western Usa: Distributions and Origins of Cpdna Haplotypes Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Zhang, D., Bon, M. 2005. Invasion of Lepidium draba (Brassicaceae) in the western United States: distributions and origins of chloroplast DNA haplotypes. Molecular Ecology. 14(8):2331-2341.
Polymorphic Microstaellite Markers in Polyploid Lepidium Draba L. Ssp. Draba (Brassicaceae) and Cross-Species Amplification in Closely Related Taxa Reprint Icon - (Peer Reviewed Journal)
Bon, M., Hurard, C., Gaskin, J.F., Risterucci, A. 2005. Polymorphic microstaellite markers in polyploid Lepidium draba L. ssp. draba (Brassicaceae) and cross-species amplification in closely related taxa. Molecular Ecology Notes. 5(1):68-70.
Hybridization of Invasive Saltcedars (Tamarix Ramosissima, T. Chinensis) and Athel (T. Aphylla) in the Southwestern Usa, Determined from Morphology and DNA Sequence Data Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F., Shafroth, P.B. 2005. Hybridization of Tamarix ramosissima, T. chinensis (saltcedars) with T. aphylla (athel)(family Tamaricaceae) in the southwestern USA determined from DNA sequence data. Madrono. 52:1-10.
Morphological Studies Toward An Improved Classification of Campanulaceae S. STR.1 - (Peer Reviewed Journal)
Shulkina, T., J. Gaskin, and W. Eddie. 2003. Morphological studies toward an improved classification of Campanulaceae s. str. Ann. Missouri Bot. Gard. 90: 576-591.
Phylogeny of Campanulaceae S. Str. Inferred from Its Sequences of Nuclear Ribosomal DNA - (Peer Reviewed Journal)
Eddie, W.M.M.,T. Shulkina, J. Gaskin, R.C. Haberle, and R.K. Jansen. 2003. Phylogeny of Campanulaceae s. str. inferred from ITS sequences of nuclear ribosomal DNA. Ann. Missouri Bot. Gard. 90: 554-575.
Phylogeography, Haplotype Trees, and Invasive Plant Species - (Peer Reviewed Journal)
SCHAAL, B., CAICEDO, A., GASKIN, J.F. PHYLOGEOGRAPHY, HAPLOTYPE TREES, AND INVASIVE PLANT SPECIES. J. HEREDITY. 2003. V. 94(3). P. 197-204.
Molecular systematics and the control of invasive plants: A case study of Tamarix (Tamaricaceae) Reprint Icon - (Peer Reviewed Journal)
Gaskin, J.F. 2003. Molecular systematics and the control of invasive plants: A case study of Tamarix (Tamaricaceae). Botanical Garden Annals Missouri. 90(1): 109-118.
Molecular Phylogenetic Investigation of Invasive Tamarix in the U.S.A. - (Peer Reviewed Journal)
GASKIN, J.F., SCHAAL, B.A. MOLECULAR PHYLOGENETIC INVESTIGATION OF INVASIVE TAMARIX IN THE U.S.A. SYSTEMATIC BOTANY. SYSTEMATIC BOTANY. 2003. V. 28(1). P. 86-95.
Tamaricaceae in the Families and Genera of Vascular Plants - (Book / Chapter)
Gaskin, J.F. Tamaricaceae in the families and genera of vascular plants. Springer Verlag. Kubitzki, K., Bayer, C., editors. Springer-Verlag, Berlin. The Families and Genera of Vascular Plants. 2003. v. 5. p. 363-368.
Hybrid Tamarix Widespread in U.S. Invasion and Undetected in Native Asian Range - (Peer Reviewed Journal)
GASKIN, J.F., SCHAAL, B.A. HYBRID TAMARIX WIDESPREAD IN U.S. INVASION AND UNDETECTED IN NATIVE ASIAN RANGE. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES. 2002. V. 99(17). P. 11256-11259.
Last Modified: 7/23/2014