Andreas Hamann's personal website
Selected publications | All publications by date | All publications by topic | All publications by citations
All Publications by Date
2023
Sang, Z., Hamann, A., Rweyongeza, D. 2023. Adapting reforestation programs to observed and projected climate change. Mitigation and Adaptation Strategies for Global Change 28: 14. doi: 10.1007/s11027-023-10050-z.
Sang, Z., Hamann, A. 2023. A record-setting 2021 heat wave in western Canada had a significant temporary impact on greenness of the world’s largest protected temperate rainforest. Remote Sensing 15: 2162. doi: 10.3390/rs15082162.
Purdy, L. M., Sang, Z., Beaubien, E., Hamann, A. 2023. Validating remotely sensed land surface phenology with leaf out records from a citizen science network. International Journal of Applied Earth Observations and Geoinformation 116: 103148. doi: 10.1016/j.jag.2022.103148
Sprengel, L., Hamann, A., Wu, S., Spiecker, H. 2023.
Carbon sequestration potential of eight economically important tree species in Northeast China under climate change. Forest Ecology and Management 545: 121299. doi: 10.1016/j.foreco.2023.121299.
Bello-Rodríguez, V., Hamann, A., Martín-Esquivel, J.L.,
Cubas, J., Del Arco, M.J., Gonzalez-Mancebo, J.M. 2023. Habitat loss and biotic velocity response to climate change for alpine plant species in Atlantic oceanic islands. Diversity 15: 864. doi: 10.3390/d15070864.
2022
Sang, Z., Hamann, A. 2022. Climatic limiting factors of North American ecosystems: a remote-sensing based vulnerability analysis. Environmental Research Letters 17: 094011. doi: 10.1088/1748-9326/ac8608
Casmey, M., Hamann, A., Hacke, U. 2022. Adaptation of white spruce to climatic risk environments in spring: implications for assisted migration. Forest Ecology and Management 525: 120555. doi: 10.1016/j.foreco.2022.120555
Mahoney, C.R., Wang, T., Hamann, A., Cannon, A.J. 2022. A CMIP6 ensemble for downscaled monthly climate normals over North America. International Journal of Climatology 42: 5871-5891.
Theis, S., Castellanos-Acuna, D., Hamann, A., Poesch, M. 2022. Exploring the potential of habitat banking in preserving freshwater biodiversity and imperiled species. Biological Conservation 237: 109700. doi: 10.1016/j.biocon.2022.109700.
Theis, S., Castellanos-Acuna, D., Hamann, A., Poesch, M. 2022. Small-bodied fish species from the western United States will be under severe water stress by 2040. Conservation Science and Practice 5: e12856. doi: 10.1111/csp2.12856.
Levesque, K., Hamann, A. 2022. Identifying western North American tree populations vulnerable to drought under observed and projected climate change. Climate 10: 114. doi: 10.3390/cli10080114.
Hossain, K., Hamann, A., Comeau, S.N. 2022. Competitive hierarchy processes support mixed species regeneration in strip-cuts in the British Columbia interior. Forests 13: 379. doi: 10.3390/f13030379.
2021
Sang, Z., Hamann, A., Aitken, S.N. 2021. Assisted migration poleward rather than upward in elevation minimizes frost risks in plantations. Climate Risk Management 34: 100380. doi: 10.1016/j.crm.2021.100380.
2020
Marchi, M., Castellanos-Acuna, D., Hamann, A., Wang, T., Ray, D. Menzel, A. 2020. ClimateEU, scale-free climate normals, historical time series, and future projections for Europe. Scientific Data 7: 428. doi: 10.1038/s41597-020-00763-0.
Li, J., Beaubien, E.and Hamann, A. 2020. Outlier detection methods to improve the quality of citizen science data. International Journal of Bioclimatology 64: 1825-1833. doi: 10.1007/s00484-020-01968-z.
Menzel, A., Yuan, Y., Hamann, A., Ohl, U., Matiu, M. 2020. Chilling and forcing from cut twigs - how to simplify phenological experiments for citizen science. Frontiers in Plant Science 11: 208. doi: 10.3389/fpls.2020.561413.
Ghada, W., Bech, J., Estrella, N., Hamann, A. Menzel, A. 2020. Weather types affect rain microstructure: implications for estimating rain rate. Remote Sensing 12: 3572. doi:10.3390/rs12213572.
Sebastian-Azcona, J., Hacke, U.G., Hamann, A. 2020. Xylem anomalies as indicators of maladaptation to climate in forest trees: implications for assisted migration. Frontiers in Plant Science 11: 208. doi: 10.3389/fpls.2020.00208.
Hynes, A., Hamann, A. 2020. Moisture deficits limit growth of white spruce in the west-central boreal
forest of North America. Forest Ecology and Management 461: 117944. doi: 10.1016/j.foreco.2020.117944.
Castellanos-Acuña, D., Hamann, A. 2020. A cross-checked global monthly weather station database for
precipitation covering the period 1901-2010. Geoscience Data Journal 7: 27-37. doi: 10.1002/gdj3.88.
Benowicz, A., Stoehr, M., Hamann, A., Yanchuk, A.D. 2020. Estimation of the F2 generation segregation variance and relationships among growth, frost damage, and bud break in coastal Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) wide-crosses. Annals of Forest Science 77: 28. doi: 10.1007/s13595-020-0925-9.
Ding, C., Hamann, A., Yang, R.-C., Brouard, J.S. 2017. Genetic parameters of growth and adaptive traits in aspen (Populus tremuloides): implications for tree breeding in a warming world. PLoS One 15: e0229225. doi: 10.1371/journal.
pone.0229225
2019
Sang, Z., Sebastian-Azcona, J., Hamann, A., Menzel, A., Hacke, U.G. 2019. Adaptive limitations of white spruce populations to drought imply vulnerability to climate change in its western range. Evolutionary Applications 12: 1850–1860.
Chechina, M., Hamann, A. 2019. Climatic drivers of dipterocarp mass flowering in Southeast Asia. Journal of Tropical Ecology 35: 108-117.
Davidson, D., Rollins, C., Lefsrud, L., Anders, S., Hamann, A. 2019. Just don't call it climate change: Climate-skeptic farmer adoption of climate mitigative practices. Environmental Research Letters 14: 034015. doi: 10.1088/1748-9326/aafa30.
Sebastian-Azcona, J., Hamann, A., Hacke, U.G., Rweyongeza, D. 2019. Survival, growth and cold hardiness tradeoffs in white spruce populations: Implications for assisted migration. Forest Ecology and Management 433: 544–552.
Zeb, A., Hamann, A., Armstrong, G.W., Acuna-Castellanos, D. 2019. Identifying local actors of deforestation and forest degradation in the Kalasha valleys of Pakistan. Forest Policy and Economics 104: 56–64.
Zeb, A., Armstrong, G.W., Hamann, A. 2019. Forest conversion by the indigenous Kalasha of Pakistan: A household level analysis of socioeconomic drivers. Global Environmental Change 59: 102004. doi: 10.1016/j.gloenvcha.2019.102004
2018
Montwé, D., Isaac-Renton, M.G., Hamann, A., Spiecker, H. 2018. Cold adaptation recorded in tree rings highlights risks associated with climate change and assisted
migration. Nature Communications 9: 1574. doi: 10.1038/s41467-018-04039-5.
Isaac-Renton, M.G., Montwé, D., Hamann, A., Spiecker, H., Cherubini, P., Treydte, K. 2018. Northern forest tree populations are physiologically maladapted to drought. Nature Communications 9: 5254. doi: 10.1038/s41467-018-07701-0.
Castellanos-Acuña, D., Vance-Borland, K.W., St. Clair, J.B., Hamann, A., López-Upton, J., Gómez-Pineda, E., Ortega-Rodríguez, J.M., Sáenz-Romero, C., 2018. Climate-based seed zones for Mexico: guiding reforestation under observed and projected climate change. New Forests 49: 297-309.
Sebastian-Azcona, J., Hacke, U.G., Hamann, A. 2018. Adaptations of white spruce to climate: strong intraspecific differences in cold hardiness linked to survival. Ecology and Evolution 8: 1758–1768.
Chechina, M., Neveux, Y., Parkins, J.R., Hamann, A. 2018. Balancing conservation and livelihoods: A study of forest-dependent communities in the Philippines. Conservation and Society 16: 420–430.
Dezsi S., Mindrescu, M., Petrea, D., Rai, P.K., Hamann, A., Nistor, M.M. 2018. High-resolution projections of evapotranspiration and water availability for Europe under climate change. International Journal of Climatology 38: 3832–3841.
2017
Carroll, C., Roberts, D. R., Michalak, J. L., Lawler, J. J., Nielsen, S. E., Stralberg, D., Hamann, A., Mcrae, B. H. and Wang, T. 2017, Scale-dependent complementarity of climatic velocity and environmental diversity for identifying priority areas for conservation under climate change. Global Change Biology 23: 4508–4520.
Stralberg D., Matsuoka S.M., Handel C.M., Schmiegelow F.K.A., Hamann A. and Bayne E.M. 2017. Biogeography of boreal passerine range dynamics in western North America: past, present, and future. Ecography 40: 1050–1066.
Ding, C., Schreiber, S.G., Roberts, D.R., Hamann, A. and Brouard, J.S. 2017. Post-glacial biogeography of trembling aspen inferred from habitat models and genetic variance in quantitative traits. Scientific Reports 7: 4672. doi: 10.1038/s41598-017-04871-7.
MacLachlan, I.R., Wang, T., Hamann, A., Smets, P., Aitken, S.N. 2017. Selective breeding of lodgepole pine increases growth and maintains climatic adaptation. Forest Ecology and Management 391: 404–416.
van der Maaten, E. Hamann, A., van der Maaten-Theunissen, M., Bergsma, A., Hengeveld, G., van Lammeren, R., Mohren, F., Nabuurs, G.-J., Terhürne, R., and Sterck, F. 2017, Species distribution models predict temporal but not spatial variation in forest growth. Ecology and Evolution 7: 2585–2594.
Strangler, D.F., Hamann, A., Kahle, H.P. and Spiecker, H. 2017. A heat wave during leaf expansion severely reduces productivity and modifies seasonal growth patterns in a northern hardwood forest. Tree Physiology 37: 47–59.
Docherty, C., Ruppert, J., Rudolfsen, T., Hamann, A., Poesch, M.S. 2017. Assessing the spread and potential impact of Prussian Carp Carassius gibelio (Bloch, 1782) to freshwater fishes in western North America. BioInvasions Records 6: 291–296.
2016
Yeaman, S., Hodgins, K.A., Lotterhos, K.E., Suren, H., Nadeau, S., Degner, J.C., Nurkowski, K.A., Smets, P., Wang, T., Gray, L.K., Liepe, K.J., Hamann, A., Holliday, J.A., Whitlock, M.C., Rieseberg, L.H. & Aitken, S.N. 2016. Convergent local adaptation to climate in distantly related conifers. Science 353:1431–1433.
Science Perspectives companion piece: Hancock, A. M. 2016. How conifers adapt to the cold. Science 353: 1362-1363.
Montwé, D., Isaac-Renton, M.G., Hamann, A. and Spiecker, H. 2016. Drought tolerance and growth in populations of a wide-ranging tree species indicate climate change risks for the boreal north. Global Change Biology 22: 806–815.
Roberts, D.R. and Hamann, A. 2016. Climate refugia and migration requirements in complex landscapes. Ecography 39: 1238–1246.
Liepe, K. J., Hamann, A., Smets, P., Fitzpatrick, C.R. and Aitken, S.N. 2016. Adaptation of lodgepole pine and interior spruce to climate: implications for reforestation in a warming world. Evolutionary Applications 9: 409–419.
Gray, L. K., Hamann, A., John, S., Rweyongeza, D., Barnhardt, L. and Thomas, B.R. 2016. Climate change risk management in tree improvement programs: selection and movement of genotypes. Tree Genetics & Genomes 12: 23. doi: 10.1007/s11295-016-0983-1.
Gray, L. K., Rweyongeza, D., Hamann, A., John, S. and Thomas, B.R. 2016. Developing management strategies for tree improvement programs under climate change: insights gained from long-term field trials with lodgepole pine. Forest Ecology and Management 377: 128–138
Wang, T., Hamann, A. Spittlehouse, D.L. and Carroll, C. 2016. Locally downscaled and spatially customizable climate data for historical and future periods for North America. PLoS One 11: e0156720.
Barber, Q.E., Nielsen, S.E. and Hamann, A. 2016. Assessing the vulnerability of rare plants using climate change velocity, habitat connectivity, and dispersal ability: a case study in Alberta, Canada. Regional Environmental Change 16: 1433–1441.
Ivkovic, M, Hamann, A., Gapare, W.J., Jovanovic, T. and Yanchuk, A. 2016. A framework for testing radiata pine under projected climate change in Australia and New Zealand. New Forests 47: 209–222.
2015
Roberts, D.R. and Hamann, A. 2015. Glacial refugia and modern genetic diversity of 22 western North American tree species. Proceedings of the Royal Society B: Biological Sciences 282: article 20142903.
Hamann, A., Roberts, D.R., Barber, Q.E., Carroll, C. and Nielsen, S.E. 2015. Velocity of climate change algorithms for guiding conservation
and management. Global Change Biology 21: 997–1004.
Carroll, C., Lawler, J.J., Roberts, D.R., Hamann, A. 2015. Biotic and climatic velocity identify contrasting areas of vulnerability to climate change. PLoS One 10: e0140486.
Stralberg, D., Matsuoka, S.M., Hamann, A., Bayne, E.M., Solymos, P., Schmiegelow, F., Wang, X., Cumming, S.G., Song S.J. 2015. Projecting boreal bird responses to climate change: the signal exceeds the noise. Ecological Applications 25: 52–69
Schreiber, S.G., Hacke, U.G. and Hamann, A. 2015. Variation of xylem vessel diameters across a climate gradient: insight from a reciprocal transplant experiment with a widespread boreal tree. Functional Ecology 29: 1392-1401.
Montwé, D., Spiecker, H. and Hamann, A. 2015. Five decades of growth in a genetic field trial of Douglas-fir reveal
trade-offs between productivity and drought tolerance. Tree Genetics & Genomes 11: article 29.
Montwé, D., Isaac-Renton, M.G., Spiecker, H. and Hamann, A. 2015. Using steam to reduce artifacts in micro sections prepared with corn starch. Dendrochronologia 35: 87-90.
Chechina, M. and Hamann, A. 2015. Choosing species for reforestation in diverse forest communities: social preference versus ecological suitability. Ecosphere 6: article240.
Gapare, W.J., Ivkovic, M, Liepe, K.J., Hamann, A. and Low, C.B. 2015. Drivers of genotype by environment interaction in radiata pine as indicated by multivariate regression trees. Forest Ecology and Management 353: 21-29.
2014
Isaac-Renton, M.G., Roberts, D.R. Hamann, A. and Spiecker, H. 2014. Douglas-fir plantations in Europe: a retrospective test of assisted migration to address climate change. Global Change Biology 20: 2607–2617.
Montwé, M.G., Spiecker, H., and Hamann, A. 2014. An experimentally controlled extreme drought in a Norway spruce forest reveals fast hydraulic response and subsequent recovery of growth rates. Trees – Structure and Function 28: 891–900.
2013
Hamann, A. and Wang, T., Spittlehouse, D.L., and Murdock, T.Q. 2013. A comprehensive, high-resolution database of historical and projected climate surfaces for western North America. Bulletin of the American Meteorological Society 94: 1307–1309.
Hamann, A. and Aitken, S.N. 2013. Conservation planning under climate change: accounting for adaptive potential and migration capacity in species distribution models. Diversity and Distributions 19: 268–280
Gray, L. K. and Hamann, A. 2013. Tracking suitable habitat for tree populations under climate change in western North America. Climatic Change 117: 289–303.
Schreiber, S.G., Hamann, A., Hacke, U.G. and Thomas, B.R. 2013. Sixteen years of winter stress: an assessment of cold hardiness, growth performance and survival of hybrid poplar clones at a boreal planting site. Plant Cell & Environment 36: 419–428.
Schreiber, S.G., Ding, C., Hamann, A., Hacke, U.G., Thomas, B.R. and Brouard, J.S. 2013. Frost hardiness vs. growth performance in trembling aspen: an experimental test of assisted migration. Journal of Applied Ecology 50: 939–949.
Worrall, J.J., Rehfeldt, G.E., Hamann, A., Hogg, E.H., Marchettia, S.B., Michaelian, M., Gray, L.K. 2013. Recent declines of Populus tremuloides in North America linked to climate. Forest Ecology and Management 299: 35–51.
Leblon, B., Spiecker, H., Neuvonen, J., Möttönen, M., Hamann, A. Karlsson, A., Cahalan, C., Stadler, M., Drummond, A. and Valinger, E. 2013. TRANSFOR-M: A unique transatlantic forestry Master program leading to a dual European and Canadian degree. Foresty Chronicle 89: 205–210
2012
Roberts, D. R. and Hamann, A. 2012. Predicting potential climate change impacts with bioclimate envelope models: a palaeoecological perspective. Global Ecology and Biogeography 21: 121–133
Roberts, D. R. and Hamann, A. 2012. Method selection for species distribution modelling: are temporally or spatially independent evaluations necessary? Ecography 35: 792–802.
Solarik, K.A., Volney, W.J.A., Lieffers, V.J., Spence1, J.R. and Hamann, A. 2012. Factors affecting white spruce and aspen survival after partial harvest. Journal of Applied Ecology 49: 145–154.
Wang, T., Hamann, A. Spittlehouse, D.L. and Murdock, T.Q. 2012. ClimateWNA – High-resolution spatial climate data for western North America. Journal of Applied Meteorology and Climatology. 51: 16-29.
Gylander, T., Hamann, A. Brouard, J. S. and Thomas, B. R. 2012. The potential of aspen clonal forestry in Alberta: breeding regions and estimates of genetic gain from selection. PLoS One 7: e44303.
Wang, X., Hamann, A. and Cumming, S. G. 2012. Measuring boreal forest fragmentation after fire: Which configuration metrics are best? Ecological Indicators. 13: 189–195.
2011
Beaubien, E. and Hamann, A. 2011. Plant phenology networks of citizen scientists: recommendations
from two decades of experience in Canada. International Journal of Bioclimatology 55: 833–841.
Gray, L. K. and Hamann, A. 2011. Strategies for reforestation under uncertain future climates: guidelines for Alberta, Canada. PLoS One 6: e22977.
Schreiber, S.G., Hacke, U.G., Hamann, A. and Thomas, B.R. 2011. Genetic variation of hydraulic and wood anatomical traits in hybrid poplar and trembling aspen. New Phytologist 190: 150–160.
2010
Mbogga, M. S., Wang, X. and Hamann, A. 2010. Bioclimate envelope model predictions for natural
resource management: dealing with uncertainty. Journal of Applied Ecology. 47: 731–740.
Schroeder, T. A.., Hamann, A., Wang, T. and Coops, N.C. 2010. Occurrence and dominance of six Pacific Northwest conifer species. Journal of Vegetation Science. 21: 586–596.
Mbogga, M. S., Hansen, C., Wang, T. and Hamann, A. 2010. A comprehensive set of interpolated climate data for Alberta. Government of Alberta, Publication Number: Ref. T/235. ISBN: 978-0-7785-9184-9 (on-line edition), 978-0-7785-9183-2 (print edition).
2009
Mbogga, M. S., Hamann, A. and T. L. Wang. 2009. Historical and projected climate data for natural resource management in western Canada. Agricultural and Forest Meteorology 149: 881-890.
Schneider, R.R., Hamann, A., Farr, D., Wang, X., and S. Boutin, A. 2009. Potential effects of climate change on ecosystem distribution in Alberta. Can. J. For. Res. 39: 1001--1010.
Chourmouzis, C., A. D. Yanchuk, A. Hamann, P. Smets, and S. N. Aitken. 2009. Forest tree genetic conservation status report 1: In situ conservation status of all indigenous British Columbia species. B.C. Min. For. Range, Victoria, B.C. Tech. Rep. 53. ISBN: 978-0-7726-6181-4.
Krakowski, J., C. Chourmouzis, A.D. Yanchuk, D. Kolotelo, A. Hamann, and S.N. Aitken. 2009. Forest tree genetic conservation status report 2: genetic conservation status of operational tree species. B.C. Min. For. Range, Victoria, B.C. Tech. Rep. 54. ISBN: 978-0-7726-6225-5.
2008
O'Neill, G., Hamann, A. and T. L. Wang. 2008. Accounting for population variation improves estimates
of the impact of climate change on species’ growth and distribution. Journal of Applied Ecology 45: 1040-1049.
2007
AFGRC 2007. Climate Change and Genetic Resources: Alberta Forest Genetics Resources Council Fact Sheet [Extension Publication]
2006
Hamann, A., and T. L. Wang. 2006. Potential effects of climate change on tree species and ecosystem distribution in British Columbia. Ecology 87: 2773-2786.
Spittlehouse, D. 2006. ClimateBC: Your Access to Interpolated Climate Data for BC. Streamline Watershed Management Bulletin 9: 16-21. [Extension Publication]
Wang, T., Hamann, A., Spittlehouse, D.L. and S.N. Aitken. 2006. Development of scale-free climate data for western Canada for use in resource management. International Journal of Climatology 26: 383-397.
Wang, T., Hamann, A., Yanchuk, A., O'Neill, G.A. and S.N. Aitken. 2006. Use of response functions in selecting lodgepole pine populations for future climates. Global Change Biology 12: 2404-2416.
2005
Hamann, A., Smets, P., Yanchuk, A.D., and S.N. Aitken. 2005. An ecogeographic framework for in situ conservation of forest trees in British Columbia. Can. J. For. Res. 35: 2553-2561.
Hamann, A. and T.L. Wang. 2005. Models of climatic normals for genecology and climate change studies in British Columbia.. Agricultural and Forest Meteorology 128: 211-221.
CICS 2005. Climate BC Software. Canadian Institute for Climate Studies, The Climate Network 10: 3-4. [Extension Publication]
Woods, A., Coates, K. D., and Hamann, A. 2005. Is an unprecedented Dothistroma needle blight epidemic related to climate change? Bioscience 55: 761-769.
Prior 2005 (grad & undergrad studies)
Hamann, A. 2004. Flowering and fruiting phenology of a Philippine
submontane rain forest: climatic factors as proximate
and ultimate causes. Journal of Ecology 92: 24-31.
Hamann, A. 2002. The North Negros Forest Reserve A Biodiversity Hotspot at Risk. Silliman Journal 43: 84-89.
Hamann, A., G. Namkoong, and M. P. Koshy. 2002. Improving precision of breeding values by removing spatially autocorrelated variation in forestry field experiments. Silvae Genetica 51: 210-215.
Curio, E., and Hamann, A. 2001. A plea for total commercial logging ban bill. Philippine Endemic Species Conservation Project. Philippine Courier, February 12, 2001. [Extension Publication].
Hamann, A. 2001. Utilization and management of red alder genetic resources in British Columbia. Forestry Chronicle 77: 705--712.
Hamann, A., Namkoong, G., and M.P. Koshy. 2001. Multiple population breeding for uncertain climatic futures with Alnus rubra: ecological genetics and selection experiments. Pp. 321-331 in Muller-Starck, G. and Schubert, R. (eds.). Genetic Response of Forest Systems to Changing Environmental Conditions. Kluwer Academic Publishers, Dortecht, Netherlands.
Hamann, A., Koshy, M.P., Namkoong, G., and C.C. Ying. 2000. Genotype x environment interactions in Alnus rubra: developing seed zones and seed-transfer guidelines with spatial statistics and GIS. Forest Ecology and Management 136: 107-119.
Hamann, A., Barbon, E.B., Curio, E., and D.A. Madulid. 1999. A botanical inventory of a submontane tropical rainforest on Negors Island, Philippines. Biodiversity and Conservation 8: 1017-1031.
Hamann, A. and Curio, C. 1999. Interactions between frugivores and fleshy fruit trees in a
Philippine submontane rainforest. Conservation Biology 13: 766-773.
Hamann, A. 1999. Utilization and management of red alder genetic resources in British Columbia. PhD Thesis. Department of Forest Science, Faculty of Forestry, University of British Columbia, Vancouver, BC..
Hamann, A., El-Kassaby, Y.A., Koshy, M.P. and Namkoong, G. 1998. Multivariate analysis of allozymic and quantitative trait variation in Alnus rubra: geographic patterns and evolutionary implications. Canadian Journal of Forest Research 28: 1557-1565.
Hamann, A. 1998. Adventitious root formation in cuttings of loblolly pine (Pinus taeda L .):
developmental sequence and effects of maturation. Trees - Structure and Function 12: 175-180.
Curio, E., Hamann, A., and L.L. Lastimoza. 1997. The appearance and status of Writhed-billed Hornbill Aceros waldeni on Panay. OBC Bulletin 23: 18--20.
Curio, E., Hamann, A. , Heubilschl, and L.L. Lastimoza. 1996. Hornbill research and conservation in the Philippines. EEP Hornbill Taxon Advisory Group Newsletter 2: 25-26.
Hamann, A. 1995. Effects of Hedging on Maturation in Loblolly Pine: Rooting Capacity and Root Formation. MSc Thesis. State University of New York, College of Environmental Science and Forestry, Syracuse, NY.
Hamann, A. 1993. An analytical key to the families of flowering plants. [The taxonomy used is somewhat dated, but the key still works well. Check for modern synonyms of plant family names]