William F. Morris

Professor of Biology

Office: 
254 Biological Sciences Building
Campus Box: 
90338
Phone: 
(919) 684-5257
Fax: 
919-660-7293

Research Interests: 

Bill Morris studies the population ecology of plants and insects (both herbivores and pollinators). Current projects include: the population dynamic consequences of constitutive and inducible resistance in plants, the maintenance of mutualistic interactions between flowering plants and nectar-robbing pollinators, the use of population-level attributes to detect biotic responses to ongoing environmental changes, and the use of mathematical models to assess viability of threatened and endangered populations. The common thread uniting these projects is that they combine field experiments and mathematical models to study population dynamics in natural and managed systems.

Bill Morris studies the population ecology of plants and
insects (both herbivores and pollinators). Current
projects include: the population dynamic consequences
of constitutive and inducible resistance in plants, the
maintenance of mutualistic interactions between
flowering plants and nectar-robbing pollinators, the use
of population-level attributes to detect biotic responses
to ongoing environmental changes, and the use of
mathematical models to assess viability of threatened
and endangered populations. The common thread uniting
these projects is that they combine field experiments
and mathematical models to study population dynamics
in natural and managed systems.

Education

  • Ph.D. 1990, University of Washington

  • B.S. 1983, Cornell University

Papers Published

Ecological and evolutionary impacts of changing climatic variability., 2, 2017
Vázquez, DP; Gianoli, E; Morris, WF; Bozinovic, F, Biological Reviews. 92 vol. (1); pp. 22-42

Demography and population growth rate of the tree Prosopis flexuosa with contrasting grazing regimes in the Central Monte Desert, 6, 2016
Aschero, V; Morris, WF; Vázquez, DP; Alvarez, JA; Villagra, PE, Forest Ecology and Management. 369 pp. 184-190

Advancing environmentally explicit structured population models of plants, 3, 2016
Ehrlén, J; Morris, WF; von Euler, T; Dahlgren, JP, Journal of Ecology. 104 vol. (2); pp. 292-305

Habitat restoration alters adult butterfly morphology and potential fecundity through effects on host plant quality, 11, 2016
Sivakoff, FS; Morris, WF; Aschehoug, ET; Hudgens, BR; Haddad, NM, Ecosphere. 7 vol. (11); pp. e01522-e01522

Female and male life tables for seven wild primate species., 1, 2016
Bronikowski, AM; Cords, M; Alberts, SC; Altmann, J; Brockman, DK; Fedigan, LM; Pusey, A; Stoinski, T; Strier, KB; Morris, WF, Scientific Data. 3 pp. 160006

Habitat restoration affects immature stages of a wetland butterfly through indirect effects on predation., 7, 2015
Aschehoug, ET; Sivakoff, FS; Cayton, HL; Morris, WF; Haddad, NM, Ecology. 96 vol. (7); pp. 1761-1767

Do geographic, climatic or historical ranges differentiate the performance of central versus peripheral populations?, 6, 2015
Pironon, S; Villellas, J; Morris, WF; Doak, DF; García, MB, Global Ecology. 24 vol. (6); pp. 611-620

Recommendations for Improving Recovery Criteria under the US Endangered Species Act, 2, 2015
Doak, DF; Himes Boor, GK; Bakker, VJ; Morris, WF; Louthan, A; Morrison, SA; Stanley, A; Crowder, LB, BioScience (BioOne). 65 vol. (2); pp. 189-199

The demographic consequences of mutualism: ants increase host-plant fruit production but not population growth., 10, 2015
Ford, KR; Ness, JH; Bronstein, JL; Morris, WF, Oecologia. 179 vol. (2); pp. 435-446

Predicting changes in the distribution and abundance of species under environmental change, 1, 2015
Ehrlén, J; Morris, WF, Ecology Letters. 18 vol. (3); pp. 303-314

Demographic compensation among populations: What is it, how does it arise and what are its implications?, 0, 2015
Villellas, J; Doak, DF; García, MB; Morris, WF, Ecology Letters. 18 vol. (11); pp. 1139-1152

Defining and evaluating the umbrella species concept for conserving and restoring landscape connectivity., 12, 2014
Breckheimer, I; Haddad, NM; Morris, WF; Trainor, AM; Fields, WR; Jobe, RT; Hudgens, BR; Moody, A; Walters, JR, Conservation Biology. 28 vol. (6); pp. 1584-1593

Defining and Evaluating the Umbrella Species Concept for Conserving and Restoring Landscape Connectivity, 1, 2014
Breckheimer, I; Haddad, NM; Morris, WF; Trainor, AM; Fields, WR; Jobe, RT; Hudgens, BR; Moody, A; Walters, JR, Conservation Biology. 28 vol. (6); pp. 1584-1593

Reproductive aging patterns in primates reveal that humans are distinct., 8, 2013
Alberts, SC; Altmann, J; Brockman, DK; Cords, M; Fedigan, LM; Pusey, A; Stoinski, TS; Strier, KB; Morris, WF; Bronikowski, AM, Proceedings of the National Academy of Sciences of USA. 110 vol. (33); pp. 13440-13445

Empirical estimation of dispersal resistance surfaces: a case study with red-cockaded woodpeckers, 4, 2013
Trainor, AM; Walters, JR; Morris, WF; Sexton, J; Moody, A, Landscape Ecology. 28 vol. (4); pp. 755-767

Ability of matrix models to explain the past and predict the future of plant populations, 0, 2013
Crone, EE; Ellis, MM; Morris, WF; Stanley, A; Bell, T; Bierzychudek, P; Ehrlén, J; Kaye, TN; Knight, TM; Lesica, P; Oostermeijer, G; Quintana-Ascencio, PF; Ticktin, T; Valverde, T; Williams, JL; Doak, DF; Ganesan, R; Mceachern, K; Thorpe, AS; Menges, ES, Conservation Biology. 27 vol. (5); pp. 968-978

Variation in stochastic demography between and within central and peripheral regions in a widespread short-lived herb, 0, 2013
Villellas, J; Morris, WF; Garcia, MB, Ecology. 94 vol. (6); pp. 1378-1388

Ability of Matrix Models to Explain the Past and Predict the Future of Plant Populations, 0, 2013
Crone, EE; Ellis, MM; Morris, WF; Stanley, A; Bell, T; Bierzychudek, P; Ehrlén, J; Kaye, TN; Knight, TM; Lesica, P; al, E, Conservation Biology.

How complex do models need to be to predict dispersal of threatened species through matrix habitats?, 0, 2012
Hudgens, BR; Morris, WF; Haddad, NM; Fields, WR; Wilson, JW; Kuefler, D; Jobe, T, Ecological Applications. 22 vol. (5); pp. 1701-1710

The geography of demography: Long-term demographic studies and species distribution models reveal a species border limited by adaptation, 0, 2011
Eckhart, VM; Geber, MA; Morris, WF; Fabio, ES; Tiffin, P; Moeller, DA, American Naturalist. 178 vol. (SUPPL. 1); pp. S26-S43

Aging in the natural world: Comparative data reveal similar mortality patterns across primates, 0, 2011
Bronikowski, AM; Altmann, J; Brockman, DK; Cords, M; Fedigan, LM; Pusey, A; Stoinski, T; Morris, WF; Strier, KB; Alberts, SC, Science. 331 vol. (6022); pp. 1325-1328

The Primate Life History Database: a unique shared ecological data resource, 6, 2010
Strier, KB; Altmann, J; Brockman, DK; Bronikowski, AM; Cords, M; Fedigan, LM; Lapp, H; Liu, X; Morris, WF; Pusey, AE; Stoinski, TS; Alberts, SC, Methods in Ecology and Evolution. 1 vol. (2); pp. 199-211

Benefit and cost curves for typical pollination mutualisms., 5, 2010
Morris, WF; Vázquez, DP; Chacoff, NP, Ecology. 91 vol. (5); pp. 1276-1285

The conflicting role of matrix habitats as conduits and barriers for dispersal, 0, 2010
Daniel, K; Brian, H; Haddad, NM; And, WFM; Nicole, T, Ecology. 91 vol. (4); pp. 944-950

Demographic compensation and tipping points in climate-induced range shifts, 0, 2010
Doak, DF; Morris, WF, Nature. 467 vol. (7318); pp. 959-962

For ant-protected plants, the best defense is a hungry offense, 2009
Ness, JH; Morris, WF; Bronstein, JL, Ecology. (2009) 90 vol. (10); pp. 2823-2831

Simultaneous effects of food limitation and inducible resistance on herbivore population dynamics, 2008
Abbott, KC; Morris, WF; Gross, K, Theoretical Population Biology. (2008) 73 vol. (1); pp. 63-78

Allee dynamics generated by protection mutualisms can drive oscillations in trophic cascades, 2008
Morales, MA; Morris, WF; Wilson, WG, Theoretical Ecology. (2008) 1 vol. (2); pp. 77-88

Longevity determines sensitivity of plant and animal populations to changing climatic variability, 2008
Morris, WF; Pfister, CA; Tuljapurkar, S; Haridas, CV; Boggs, C; Boyce, MS; Bruna, EM; Church, DR; Coulson, T; Doak, DF; Forsyth, S; Gaillard, JM; Horvitz, CC; Kalisz, S; Kendall, BE; Knight, TM; Lee, CT; Menges, ES, Ecology. (2008) 89 vol. (1); pp. 19-25

Longevity can buffer plant and animal populations against changing climatic variability, 0, 2008
Morris, WF; Pfister, CA; Tuljapurkar, S; Haridas, CV; Boggs, CL; Boyce, MS; Bruna, EM; Church, DR; Coulson, T; Doak, DF; Forsyth, S; Gaillard, J-M; Horvitz, CC; Kalisz, S; Kendall, BE; Knight, TM; Lee, CT; Menges, ES, Ecology. 89 vol. (1); pp. 19-25

Direct and interactive effects of enemies and mutualists on plant performance: a meta-analysis., 2007
Morris, WF; Hufbauer, RA; Agrawal, AA; Bever, JD; Borowicz, VA; Gilbert, GS; Maron, JL; Mitchell, CE; Parker, IM; Power, AG; Torchin, ME; Vázquez, DP, Ecology. (2007) 88 vol. (4); pp. 1021-1029

CO2-enrichment and nutrient availability alter ectomycorrhizal fungal communities., 9, 2006
Parrent, JL; Morris, WF; Vilgalys, R, Ecology. 87 vol. (9); pp. 2278-2287

Integrating quality and quantity of mutualistic service to contrast ant species protecting Ferocactus wislizeni, 2006
Ness, JH; Morris, WF; Bronstein, JL, Ecology. (2006) 87 vol. (4); pp. 912-921

Sensitivity of the population growth rate to demographic variability within and between phases of the disturbance cycle, 0, 2006
Morris, WF; Tuljapurkar, S; Haridas, CV; Menges, ES; Horvitz, CC; Pfister, CA, Ecology Letters. 9 vol. (12); pp. 1331-1341

Effects of a CO2 – enriched atmosphere on community composition and diversity of ectomycorrhizal fungi, 0, 2006
Parrent, JL; Morris, WF; Vilgalys, R, Ecology. 87 vol. (9); pp. 2278-2287

Beyond enemy release: biotic interactions and plant invasions, 0, 2006
Mitchell, CE; Agrawal, AA; Bever, JD; Gilbert, GS; Hufbauer, RA; Klironomos, JN; Maron, JL; Morris, WF; Parker, IM; Power, AG; Seabloom, EW; Torchin, ME; Vázquez, DP, Ecology Letters. 9 vol. (6); pp. 726-740

CO<sub>2</sub>-enrichment and nutrient availability alter ectomycorrhizal fungal communities, 0, 2006
Parrent, JL; Morris, WF; Vilgalys, R, Ecology. 87 vol. (9); pp. 2278-2287

On testing for a tradeoff between constitutive and induced resistance, 2006
Morris, WF; Traw, MB; Bergelson, J, Oikos. (2006) 112 vol. (1); pp. 102-110

Biotic interactions and plant invasions, 0, 2006
Mitchell, CE; Agrawal, AA; Bever, JD; Gilbert, GS; Hufbauer, RA; Klironomos, JN; Maron, JL; Morris, WF; Parker, IM; Power, AG; Seabloom, EW; Torchin, ME; Vázquez, DP, Ecology Letters. 9 vol. (6); pp. 726-740

Resource-dependent dispersal and the speed of biological invasions, 2006
Dwyer, G; Morris, WF, American Naturalist. (2006) 167 vol. (2); pp. 165-176

Modeling vital rates improves estimation of population projection matrices, 2006
Gross, K; Morris, WF; Wolosin, MS; Doak, DF, Population Ecology. (2006) 48 vol. (1); pp. 79-89

Demography in an increasingly variable world, 2006
Boyce, MS; Haridas, CV; Lee, CT; Boggs, CL; Bruna, EM; Coulson, T; Doak, D; Drake, JM; Gaillard, J-M; Horvitz, CC; Kalisz, S; Kendall, BE; Knight, T; Mastrandrea, M; Menges, ES; Morris, WF; Pfister, CA; Tuljapurkar, SD, Trends in Ecology & Evolution. (2006) 21 vol. (3); pp. 141-148

Environmental forcing and the competitive dynamics of a guild of cactus-tending ant mutualists, 0, 2005
Morris, WF; Wilson, WG; Bronstein, JL; Ness, JH, Ecology. 86 vol. (12); pp. 3190-3199

Correctly estimating how environmental stochasticity influences fitness and population growth., 0, 2005
Doak, DF; Morris, WF; Pfister, C; Kendall, BE; Bruna, EM, American Naturalist. 166 vol. (1); pp. E14-E21

Interaction frequency as a surrogate for the total effect of animal mutualists on plants, 0, 2005
Vázquez, DP; Morris, WF; Jordano, P, Ecology Letters. 8 vol. (10); pp. 1088-1094

Understanding and predicting the effects of sparse data on demographic analyses, 2005
Doak, DF; Gross, K; Morris, WF, Ecology. (2005) 86 vol. (5); pp. 1154-1163

How general are the determinants of the stochastic population growth rate across nearby sites?, 2005
Morris, WF; Doak, DF, Ecological Monographs. (2005) 75 vol. (1); pp. 119-137

Buffering of life histories against environmental stochasticity: accounting for a spurious correlation between the variabilities of vital rates and their contributions to fitness., 4, 2004
Morris, WF; Doak, DF, American Naturalist. 163 vol. (4); pp. 579-590

When can two plant species facilitate each other's pollination?, 0, 2004
Feldman, TS; Morris, WF; Wilson, WG, Oikos. 105 vol. (1); pp. 197-207

Three-way coexistence in obligate mutualist-exploiter interactions: the potential role of competition., 6, 2003
Morris, WF; Bronstein, JL; Wilson, WG, American Naturalist. 161 vol. (6); pp. 860-875

Conservation genetics in the recovery of endangered animal species: A review of US endangered species recovery plans (1977-1998), 0, 2003
Moyle, LC; Stinchcombe, JR; Hudgens, BR; Morris, WF, Animal Biodiversity and Conservation. 26 vol. (2); pp. 85-95

Coexistence of mutualists and exploiters on spatial landscapes, 0, 2003
Wilson, WG; Morris, WF; Bronstein, JL, Ecological Monographs. 73 vol. (3); pp. 397-413

Ecological Dynamics of Mutualist/Antagonist Communities, 0, 2003
Bronstein, JL; Wilson, WG; Morris, WF, American Naturalist. 162 vol. (4 SUPPL.); pp. S24-S39

Which mutualists are most essential?: buffering of plant reproduction against the extinction of pollinators, 0, 2003
W.F. Morris,

Population viability analysis in endangered species recovery plans: Past use and future improvements, 0, 2002
Morris, WF; Bloch, PL; Hudgens, BR; Moyle, LC; Stinchcombe, JR, Ecological Applications. 12 vol. (3); pp. 708-712

The influence of the academic conservation biology literature on endangered species recovery planning, 0, 2002
Stinchcombe, J; Moyle, LC; Hudgens, BR; Bloch, PL; Chinnadurai, S; Morris, WF, Conservation Ecology. 6 vol. (2); pp. 15

Population viability analysis in endangered species recovery planning: Past use and recommendations for future improvement, 0, 2002
Morris, WF; Bloch, PL; Hudgens, BR; Moyle, LC; Stinchcombe, JR, Ecological Applications.

The influence of the academic conservation biology literature on endangered species recovery planning, 0, 2002
Stinchcombe, J; Moyle, LC; Hudgens, BR; Bloch, PL; Chinnadurai, S; Morris, WF, Ecology and Society. 6 vol. (2);

Induced resistance to Mexican bean beetles in soybean: Variation among genotypes and lack of correlation with constitutive resistance, 0, 2000
Underwood, N; Morris, W; Gross, K; III, JRL, Oecologia. 122 vol. (1); pp. 83-89

Herbivory, 0, 2000
W.F. Morris,

Detecting population-level consequences of ongoing environmental change without long-term monitoring, 1999
Doak, DF; Morris, W, Ecology. (1999) 80 vol. (5); pp. 1537-1551

. 1999. Detecting population-level consequences of ongoing environmental change without long-term monitoring, 0, 1999
Doak, DF; Morris, WF, Ecology. 80 pp. 1537-1551

Life history of the long-lived gynodioecious cushion plant Silene acaulis (Caryophyllaceae), inferred from size-based population projection matrices, 0, 1998
Morris, WF; Doak, DF, American journal of botany. 85 vol. (6); pp. 784-793

Modeling controlled burning and trampling reduction for conservation of Hudsonia montana, 0, 1998
Gross, K; III, JRL; Frost, CC; Morris, WF, Conservation Biology. 12 vol. (6); pp. 1291-1301

Disentangling effects of induced plant defenses and food quantity on herbivores by fitting nonlinear models., 9, 1997
Morris, WF, American Naturalist. 150 vol. (3); pp. 299-327

Population consequences of constitutive and inducible plant resistance: herbivore spatial spread., 6, 1997
Morris, WF; Dwyer, G, American Naturalist. 149 vol. (6); pp. 1071-1090

Mutualism denied? Nectar-robbing bumble bees do not reduce female or male success of bluebells, 0, 1996
Morris, WF, Ecology. 77 vol. (5); pp. 1451-1462

Mechanisms of pollen deposition by insect pollinators, 0, 1995
Morris, WF; Mangel, M; Adler, FR, Evolutionary Ecology. 9 vol. (3); pp. 304-317

Systematic increase in pollen carryover and its consequences for geitonogamy in plant populations, 0, 1994
Morris, WF; Price, MV; Waser, NM; Thomson, JD; Thomson, B; Stratton, DA, Oikos. 71 vol. (3); pp. 431-440

Do barren zones and pollen traps reduce gene escape from transgenic crops?, 0, 1994
Morris, WF; Kareiva, PM; Raymer, PL, Ecological Applications. 4 vol. (1); pp. 157-165

A general test for interaction modification, 0, 1994
Adler, FR; Morris, WF, Ecology. 75 vol. (6); pp. 1552-1559

Predicting the consequences of plant spacing and biased movement for pollen dispersal by honey bees, 0, 1993
Morris, WF, Ecology. 74 vol. (2); pp. 493-500

Causes and consequences of spatial aggregation in the phytophagous beetle Altica tombacina, 0, 1992
Morris, WF; Wiser, SD; Klepetka, B, Journal of Animal Ecology. 61 vol. (1); pp. 49-58

The effects of natural enemies, competition, and host plant water availability on an aphid population, 0, 1992
Morris, WF, Oecologia. 90 vol. (3); pp. 359-365

Ecological constraints to seedling establishment on the Pumice Plains, Mount St Helens, Washington, 0, 1990
Wood, DM; Morris, WF, American Journal of Botany. 77 vol. (11); pp. 1411-1418

Problems in detecting chaotic behavior in natural populations by fitting simple discrete models, 0, 1990
Morris, WF, Ecology. 71 vol. (5); pp. 1849-1862

The role of lupine in succession on Mount St. Helens: facilitation or inhibition, 0, 1989
Morris, WF; Wood, DM, Ecology. 70 vol. (3); pp. 697-703

Seed dispersal and seedling emergence in an old field community in central New York (USA), 0, 1986
Morris, WF; Marks, PL; Mohler, CL; Rappaport, NR; Wesley, FR; Moran, MA, Oecologia. 70 vol. (1); pp. 92-99

Book Chapters:

Life History in S.A. Levin, Ed., Guide to Ecology. Princeton University Press, Princeton, 2009
W.F. Morris

Quantitative Conservation Biology: Theory and Practice of Population Viability Analysis in , 0, 2002
W.F. Morris and D.F. Doak

A Practical Handbook for Population Viability Analysis in , 0, 1999
W.F. Morris, M. Groom, D. Doak, P. Kareiva, J. Fieberg, L. Gerber, P. Murphy, and D. Thomson

Awards

  • 2008 Traditional Fulbright Scholarship, Council for International Exchange of Scholars