University of Guam, Western Pacific Tropical Research Center - Research for Guam's Future
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Thomas E Marler


PhD University of Florida 
MSc Mississippi State University 
BSc Mississippi State University

Research Interests

• Environmental physiology of terrestrial plants
• Horticultural practices on Guam

His research program at the University of Guam is based on two general areas of research: environmental physiology of terrestrial plants and horticultural practices on Guam. The major focus of the environmental physiology research is targeted at understanding the responses of plants to the typical abiotic stresses of the Mariana Islands. This work is primarily whole plant physiology. The horticultural research aims at improving production practices of tropical fruit species and native woody perennial tree species.

Contact Information:

Telephone: 671-735-2130
Cell Phone: 671-000-0000
Fax: 671-734-4600
Contact Thomas E Marler via email

Thomas E Marler is currently involved in the following Fields of Study:

Articles about Thomas E Marler:

Publications by Thomas E Marler:

Marler, T.E., N. Dongol, and G.N. Cruz. 2016. Plastic responses mediated by identity recognition in below-ground competition in Cycas micronesica K.D. Hill. Tropical Conservation Science 9:648-657.

Marler, T.E. and J.H. Lawrence. 2015. Leaf and Soil Nutrient Relations of Elaeocarpus joga Merr. in Oceanic Island Calcareous Soils. HortScience 50 (11):1644–1649. 2015.

Marler, T.E. and U.F. Ferreras. 2015. Disruption of Leaf Nutrient Remobilization in Coastal Cycas Trees by Tropical Cyclone Damage. J Geogr Nat Disast 2015, 5:2

Marler, T.E. and C. Musser. 2015. Potential stressors leading to seedling mortality in the endemic Håyun lågu tree (Serianthes nelsonii Merr.) in the island of Guam. Tropical Conservation Science Vol.8 (3): 738-744. 

Marler, P.N. and T.E. Marler. 2015. An assessment of Red List data for the Cycadales. Tropical Conservation Science Vol.8 (4): 1114-1125.

Hamada, T., I. Terry, T. E. Marler. 2015. Habitats, Trade Winds, and Pollination of the Endangered Cycas micronesica: Is There a Role for Wind as Pollen Vector on the Island of Guam? International Journal of Plant Sciences, 176 (6): 525-543, ISSN: 10585893.

Marler, T.E. and A.J. Lindström. 2015. Carbohydrates, pollinators, and cycads. Communicative & Integrative Biology 8:e10171621-10171623.

Marler, T.E. 2015. Promoting the confluence of tropical cyclone research. Communicative & Integrative Biology 8:e1017651-10171653.

Marler, T.E. and A.J. Lindström. 2014.The value of research to selling the conservation of threatened species: the case of Cycas micronesica. Journal of Threatened Taxa 6:6523-6528.

Marler, T.E. 2014. Growth and ionic relations of soursop seedlings as influenced by substrate pH. Acta Horticulturae 1024:257-260.

Marler, T.E. 2014. Water transfer in a papaya-corn culture system. Acta Horticulturae 1022:105-109.

Marler, T.E. and O. Terral. 2014. It is what it is, but it shouldn’t be: the science of ambiguity. HortScience 49:1234–1236.

Marler, T.E. and A.J. Lindström. 2014. Free sugar profile in cycads. Frontiers in Plant Science 5:526. doi: 10.3389/fpls.2014.00526.

Marler, T.E. 2014. Pacific island tropical cyclones are more frequent and globally relevant, yet less studied. Frontiers in Environmental Science 2:42. doi: 10.3389/fenvs.2014.00042.

Gorelick, R. and T.E. Marler. 2014. Kin recognition by roots occurs in cycads and probably in conifers. Communicative & Integrative Biology 7:e280091-280092.

Watson, G.W. and T.E. Marler. 2014. Does cycad aulacaspis scale (Aulacaspis yasumatsui, Hemiptera: Diaspididae) play a direct role in causing soil phytotoxicity?. Communicative & Integrative Biology 7:e278811-278813.

Marler, T.E. and U. F. Ferreras. 2014. Differential leaflet mortality may influence biogeochemical cycling following tropical cyclones. Communicative & Integrative Biology 7:e279241-279243.

Marler, T.E. 2013. The intersection of a military culture and indigenous peoples in conservation issues. Communicative & Integrative Biology 6:e266651-266653.

Marler, T.E. 2013. Vertical stratification in arthropod distribution research. Communicative & Integrative Biology 6:e257491-247493.

Marler, T.E. and R. del Moral. 2013. Primary succession in Mount Pinatubo: habitat availability and ordination analysis. Communicative & Integrative Biology 6:e259241-2592417.

Marler, T.E. 2013. Kin recognition alters root and whole plant growth of split-root Cycas edentata seedlings. HortScience 48:1266-1269.

Marler, T.E. and J.H. Lawrence. 2013. Phytophagous insects reduce cycad resistance to tropical cyclone winds and impair storm recovery. HortScience 48:1224-1226.

Marler, T.E. 2013. Temporal variations in leaf miner, butterfly, and stem borer infestations of Cycas micronesica in relation to Aulacaspis yasumatsui incidence. HortScience 48:1334-1338.

Marler, T.E. and N. Dongol. 2013. Do phytotoxic compounds in soils after scale-infested Cycas micronesica litter deposits explain reduced plant growth? HortScience 48:1571-1573.

Shaw, C.A., Marler, T.E. 2013. Aluminum and the human diet revisited. Communicative & Integrative Biology 6:e263691-263693.

Roemer, R.B., L.I. Terry, and T.E. Marler. 2013. Cone thermogenesis and its limits in the tropical Cycas micronesica (Cycadaceae): association with cone growth, dehiscence, and post-dehiscence phases. Amer. J. Botany 100:1981–1990.

Marler, T.E. and J. Yang. 2013. Risk of aluminum exposure from noni (Morinda citrifolia L.) leaf products. Economic Botany 67:203-209.

Marler, T.E. 2013. Military ecology more fitting than warfare ecology. Environmental Conservation 40:207-208.

Marler, T.E., R. Miller, and A. Moore. 2013. Vertical stratification of predation on Aulacaspis yasumatsui infesting Cycas micronesica seedlings. HortScience 48:60–62.

Marler, T.E. 2013. Salinity and physiology of Passiflora edulis. Acta Horticulturae 975:293-298.

Marler T.E. 2013. Increased threat of island endemic tree’s extirpation via invasion-induced decline of intrinsic resistance to recurring tropical cyclones. Communicative & Integrative Biology 6:e223611-e223616

Marler T.E. and J.H. Lawrence. 2013. Canopy and knowledge gaps when invasive alien insects remove foundation species. Communicative & Integrative Biology 6:e223311-e223315

Cave, R.D., J.T. Chao, B. Kumashiro, T. Marler, J. Miles, A. Moore, R. Muniappan, and G.W. Watson. 2013. Status and biological control of cycad aulacaspis scale. Biocontrol News Information 34(1):1-4.


Marler, T.E. 2012. Boomeranging in structural defense: Phytophagous insect uses cycad trichomes to defend against entomophagy. Plant Signaling & Behavior 7:1484 –1487.

Marler, T.E., Lindström, and L.I. Terry. 2012. Chilades pandava damage among 85 Cycas species in a common garden setting. HortScience 47:1832-1836.

Terry, I., W. Tang, and T.E. Marler. 2012. Pollination systems of island cycads: Predictions based on island biogeography. Memoirs New York Botanical Garden 106:102-132.

Roemer, R., I. Terry, G. Walter, and T.E. Marler. 2012. Comparison of experimental measurements and predictions from biophysical models of thermogenic events in cones of Macrozamia lucida, M. macleayi and Cycas micronesica. Memoirs New York Botanical Garden 106:302-317.

Yarowsky, P., K.A. McDowell, W.-B. Shen, J.M.B. Wilson, R. Cruz-Aguado, T. E. Marler, and C.A. Shaw. 2012. Cycad-induced neurodegeneration is different in rat and mouse models of ALS-PDC. Memoirs New York Botanical Garden 106:279-294.

Marler, T.E. 2012. Cycad aulacaspis scale invades the Mariana Islands. Memoirs New York Botanical Garden 106:20-35.

Marler, T.E., A. Lindström, L.I. Terry. 2012. Information-based or resource-based systems may mediate Cycas herbivore interactions. Plant Signaling & Behavior 7:760-762.

Gorelick, R. and T.E. Marler. 2012. Evolutionary developmental biology in cycad phenology. Communicative & Integrative Biology 5:272-274.

Marler, T.E., G. Wiecko and A. Moore. 2012. Application of game theory to the interface between militarization and environmental stewardship in the Mariana Islands. Communicative and Integrative Biology 5:193-195.

Marler, T.E. and J.H. Lawrence. 2012. Demography of Cycas micronesica on Guam following introduction of the armoured scale Aulacaspis yasumatsui. Journal of Tropical Ecology 28:233–242. pdf

Marler, T.E. and I. Terry. 2011. Arthropod invasion disrupts Cycas micronesica seedling recruitment. Communicative and Integrative Biology 4:778-780 pdf.

Marler, T.E. 2011. The Aeta – Pinatubo Loop. Communicative & Integrative Biology 4:788-790 pdf.

Marler, T.E., L.S. Yudin, and A. Moore. 2011. Schedorhinotermes longirostris (Isoptera: Rhinotermitidae) on Guam adds to assault on the endemic Cycas micronesica. Florida Entomologist 94:699-700. pdf

Marler, T.E. 2011. Leaf gas exchange of pineapple as influenced by fruit. Acta Horticulturae 902:239-243. pdf

Marler, T.E. 2011. Partitioning of dry matter in fruiting and vegetative pineapple plants of homogeneous age. Acta Horticulturae 902:253-256. pdf

Marler, T.E. 2011. Recovering plant biodiversity: Mount Pinatubo lessons to learn. Plant Signaling & Behavior 6:1380-1382.

Marler, T.E. and A. Moore. 2011. Military threats to terrestrial resources not restricted to wartime: a case study from Guam. J. Environmental Engineering 5:1198-1214. pdf

Marler, T.E. 2011. Growth responses to wind differ among papaya roots, leaves, and stems. HortScience 46:1105-1109.

Cibrian-Jaramillo, A. and T.E. Marler. 2011. Novel tools for an old lineage. Communicative & Integrative Biology 4:466-468.

Marler, T. E. and N. Dongol. 2011. Models to describe Cycas micronesica leaf and strobili development. HortScience 46: 1333-1337.

Marler, T.E. and K. Niklas. 2011. Reproductive effort and success of Cycas micronesica K.D. Hill are affected by habitat. International J. Plant Sciences 172:700-706.

Snyder, L.R. and T.E. Marler. 2011. Rethinking cycad metabolite research. Communicative & Integrative Biology 4(1):86-88.

Marler, T.E. and R. del Moral. 2011. Primary succession along an elevation gradient 15 years after the eruption of Mount Pinatubo, Luzon, Philippines. Pacific Science 65:157-173. pdf.

Marler, T.E. 2010. Time-size trade-offs in responses of cycads to male cone herbivory. Communicative & Integrative Biology 3(6):602-603.

Marler, T.E., A. Lindström, and J.B. Fisher. 2010. Stem tissue dimensions correlate with ease of horticultural management for six Cycas species. HortScience 45:1293-1296.  

Marler, T. E., Snyder L. R., Shaw, C. A. 2010. Cycas Micronesica (Cycadales) plants devoid of endophytic cynobacteria increase in ß-methylamino-L-alanine. Toxicon. doi: 10.1016/j.toxicon.2010.05.15.

Cbrian-Jaramillo, A., A.C. Daly, E. Brenner, R. DeSalle, and T.E. Marler. 2010. When North and South don’t mix: genetic connectivity of a recently endangered oceanic cycad,Cycas micronesica, in Guam using EST-microsatellites. Molecular Ecology 19:2364-2379.

Marler, T.E. 2010. Cycad mutualist offers more than pollen transport. Amer. J. Botany 97:841-845.

Marler, T.E. and A. Moore. 2010. Cryptic Scale Infestations on Cycas revoluta Facilitate Scale Invasions. HortScience 45:837-839.

Altaner, C.M., M.C. Jarvis, J.B. Fisher and T.E. Marler. 2010. Molecular xylem cell wall structure of an inclined Cycas micronesica stem, a tropical gymnosperm. IAWA Journal 31(1): 3-11.

Marler, T.E. and C.A. Shaw. 2010. Distribution of free and glycosylated sterols within Cycas micronesica plants. Scientia Horticulturae 123:537-542.

Fisher, J.B., A. Lindström, and T. Marler . 2009. Tissue responses and solution movement after stem wounding in six Cycas species. HortScience 44:848-851.

Marler, T.E. and C.A. Shaw. 2009. Phenotypic characteristics as predictors of phytosterols in mature Cycas micronesica seeds. HortScience 44:725-729

Marler, T.E. and S.T. Smith. 2009. Respecting the complexity of cultural differences in multicultural horticulture instruction. Acta Horticulturae 832:131-136

Terry, I., M. Roe, W. Tang, T.E. Marler. 2009. Cone insects and putative pollen vectors of the endangered cycad, Cycas micronesicaMicronesica 41:83-99.

Marler, T.E. and C.A. Shaw. 2009. Free and glycosylated sterol bioaccumulation in developing Cycas micronesica seeds. Food Chemistry 115: 615-619.

Niklas, K.J. and T.E. Marler. 2008. Sex and population differences in the allometry of an endangered cycad species, Cycas micronesica (Cycadales). International J. Plant Science 169:659-665.

Cibrián-Jaramillo, A., T.E. Marler, R. DeSalle, and E.D. Brenner. 2008. Development of EST-microsatellites from the cycad Cycas rumphii, and their use in the recently endangered Cycas micronesica. Conservation Genomics 9:1051-1054.

Marler, T.E., V. Lee, and C.A. Shaw. 2007. Habitat Heterogeneity of Cycas micronesica Seed Chemistry in Guam's Forest. Micronesica 39:297-314.

Marler, T.E., V. Lee, and C.A. Shaw. 2007. Storage does not influence steryl glucosides in Cycas micronesica seeds. HortScience 42:626-628.

Marler, T.E. 2007. Papaya seed germination and seedling emergence are not influenced by solution pH. Acta Horticulturae 740:203-207.

Niklas, K.J. and T.E. Marler. 2007. Carica papaya: a case study into the effects of domestication on plant vegetative growth and reproduction. American J. Botany 94:999-1002.

Shaw, C.A., J.M.B. Wilson, R. Cruz-Aguado, S. Singh, E.L. Hawkes, V. Lee, and T. Marler. 2007. Cycad-Induced Neurodegeneration in a Mouse Model of ALS-PDC: Is the Culprit Really BMAA or Is a Novel Toxin to Blame? Memoirs New York Botanical Garden 97:286-307.

Marler, T.E. 2007. Age influences photosynthetic capacity of Cycas micronesica leaves. Memoirs New York Botanical Garden 97:193-203.

Fisher, J.B. and T.E. Marler. 2006. Eccentric growth but no compression wood in a horizontal stem of Cycas micronesica (Cycadales). IAWA J. 27:377-382.

Marler, T.E., V. Lee, J. Chung, and CA. Shaw. 2006. Steryl glucoside concentration declines with Cycas micronesica seed age. Functional Plant Biology 33:857-862.

Marler, T.E. and R. Munippan. 2006. Pests of Cycas micronesica Leaf, Stem, and Male Reproductive Tissues with Notes on Current Threat Status. Micronesica 39:1-9.

Niklas, K.J., E.D. Cobb, and T. Marler. 2006. A comparison between the record height-to-stem diameter allometries of pachycaulis and leptocaulis species. Annals of Botany97:79-83.

Marler, T.E. and H.S. Clemente. 2006. Papaya seedling growth response to wind and water deficit is additive. HortScience 41:96-98.

Marler, T.E., V. Lee, and C.A. Shaw. 2005. Cycad toxins and Neurological Diseases in Guam: Defining Theoretical and Experimental Standards for Correlating Human Disease with Environmental Toxins. HortScience 40:1598-1606.

Marler, T.E., V. Lee, and C.A. Shaw. 2005. Spatial variation of steryl glucosides in Cycas micronesica plants: within- and among-plant sampling procedures. HortScience 40:1607-1611.

Marler, T.E. 2004. Leaf physiology of shade-grown Cycas micronesica leaves following removal of shade. The Botanical Review 70:63-71.

Marler,T.E. and J.H. Lawrence. 2004. Chemical Limitations of Yoga Root Growth in an Acid Soil. Micronesica 37:157-161.

Hirsh, H. and T. Marler. 2002. Damage and recovery of Cycas micronesica after Typhoon Paka. Biotropica 34:598-602.

Muniappan, R., T.E. Marler, and J.H. Lawrence. 2002. Pests of Elaeocarpus joga in Guam. Micronesica 34:109-111.

Marler, T.E., R. dela Cruz, and A.L. Blas. 2002. Iron deficiency-induced changes in iron reductase activity in papaya roots. J. Amer. Soc. Hort. Sci. 127:184-187.

Marler, T.E. 2002. Conservation of local genotypes when planting native plants on Guam. Micronesica Suppl. 6:55-60.

Marler, T.E. and R. dela Cruz. 2001. Chemical factors enhancing papaya root growth in a tropical volcanic acid subsoil. HortScience36:1037-1038.

Clemente, H.S. and T.E. Marler. 2001. Trade winds reduce growth and influence gas exchange patterns in papaya seedlings. Annals of Botany 88:379-385.

Marler, T.E. 2001. Tropical cyclones and perennial species in the Mariana Islands. HortScience 36:264-268.

Marler, T. E. and B. Wood. 2001. Recovery dynamics of perennial species following tropical cyclone damage. HortScience 36:240-242.

Muniappan, R., J.H. Lawrence, and T.E. Marler. 2000. Greenhouse and red banded thrips and two of their natural enemies on Elaeocarpus joga in Guam. J. Hawaiian Pacific Agric. 11:61-63.

Muniappan, R., T. Marler, and H. Hirsh. 2000. Trioza suavis galls on leaves of Elaeocarpus joga. Micronesica 33:165-167.

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