Haddad Lab Publications

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2020

2019

Haddad, N.M. The Last Butterflies: A Scientist’s Quest to Save a Rare and Vanishing Creature. Princeton University Press. To be published June, 2019. Available Now

Damschen, E.I., Brudvig, L.A., Burt, M.A., Fletcher, R.J., Haddad, N.M., Levey, D.J., Orrock, J.L., Resasco, J. and Tewksbury, J.J. 2019. Ongoing accumulation of plant diversity through habitat connectivity in an 18-year experiment. Science, 365:1478-1480.

Chaplin-Kramer, R., R. P. Sharp, C. Weil, E. M. Bennett, U. Pascual, K. K. Arkema, K. A. Brauman, B. P. Bryant, A. D. Guerry, N. M. Haddad, M. Hamann, P. Hamel, J. A. Johnson, L. Mandle, H. M. Pereira, S. Polasky, M. Ruckelshaus, M. R. Shaw, J. M. Silver, A. L. Vogl, and G. C. Daily. 2019. Global modeling of nature’s contributions to people. Science 366:255-258. [visit website]

Wepprich T, Adrion JR, Ries L, Wiedmann J, Haddad NM (2019) Butterfly abundance declines over 20 years of systematic monitoring in Ohio, USA. PLoS ONE 14(7): e0216270. https://doi.org/10.1371/journal.pone.0216270

Schultz, C. B., N. M. Haddad, E. H. Henry, and E. E. Crone. 2019. Movement and Demography of At-Risk Butterflies: Building Blocks for Conservation. Annual Review of Entomology 64:167-184 [view e-print] doi:10.1146/annurev-ento-011118-112204

Helms, Jackson A., Selassie E. Ijelu, and Nick M. Haddad. 2019. Range expansion in an introduced social parasite-host species pair. Biological Invasions 21: 2751-2759. [visit website]

Caughlin, T. T., E. I. Damschen, N. M. Haddad, D. J. Levey, C. Warneke, and L. A. Brudvig. 2019. Landscape heterogeneity is key to forecasting outcomes of plant reintroduction. Ecological Applications 29(2):e01850. doi:10.1002/eap.1850

2018

Hawn, C. L., Herrmann, J. D., Griffin, S. R. and Haddad, N. M. 2018. Connectivity increases trophic subsidies in fragmented landscapes. Ecology Letters 21: 1620-1628. [PDF reprint] doi:10.1111/ele.12958

Fletcher, R. J., R. K. Didham, C. Banks-Leite, J. Barlow, R. M. Ewers, J. Rosindell, R. D. Holt, A. Gonzalez, R. Pardini, E. I. Damschen, F. P. L. Melo, L. Ries, J. A. Prevedello, T. Tscharntke, W. F. Laurance, T. Lovejoy, and N. M. Haddad. 2018. Is habitat fragmentation good for biodiversity? Biological Conservation 226:9-15. [PDF reprint]

Cayton, H., and N.M. Haddad. 2018. Water Availability Coincides with Population Declines for an Endangered Butterfly. Diversity 10:94. doi:10.3390/d10030094 [open online]

Haddad N.M. 2018. Resurrection and resilience of the rarest butterflies. PLoS Biology 16(2): e2003488. doi:10.1371/journal.pbio.2003488  [open online]

Herrmann, J. D., N. M. Haddad, and D. J. Levey.  2018. Mean body size predicts colony performance in the common eastern bumble bee (Bombus impatiens). Ecological Entomology 43: 458-462. 10.1111/een.12517 [open online] 

2017

Haddad, N. M., R. D. Holt, R. J. Jr Fletcher, M. Loreau, and J. Clobert. 2017. Connecting models, data, and concepts to understand fragmentation’s ecosystem-wide effects. Ecography 40:1-8. [PDF reprint]

Haddad, N. M., Gonzalez, A., Brudvig, L. A., Burt, M. A., Levey, D. J. and Damschen, E. I. 2017. Experimental evidence does not support the Habitat Amount Hypothesis. Ecography 40:48-55. doi:10.1111/ecog.02535 [PDF reprint] 

Resasco, J., Bruna, E., Haddad, N., Banks‐Leite, C., & Margules, C. 2017. The contribution of theory and experiments to conservation in fragmented landscapes. Ecography 40:109-118 doi:10.1111/ecog.02546 [PDF reprint]

Herrmann, J.D., N.M. Haddad, and D.J. Levey. 2017. Testing the relative importance of local resources and landscape connectivity on Bombus impatiens (Hymenoptera, Apidae) colonies. Apidologie DOI: 10.1007/s13592-017-0499-1. [PDF reprint]

Haddad, N. and D. Wagner. 2017. Persistent decline in the abundance and diversity of Lepidoptera. News of the Lepidopterists’ Society 59:94-95, 101. [PDF reprint]

2016

Sivakoff, F. S., W. F. Morris, E. T. Aschehoug, B. R. Hudgens, and N. M. Haddad. 2016. Habitat restoration alters adult butterfly morphology and potential fecundity through effects on host plant quality. Ecosphere 7(11):e01522.10.1002/ecs2.1522 [PDF reprint]

Herrmann, J.D., T.A. Carlo, L.A. Brudvig, E.I. Damschen, N.M. Haddad, D.J. Levey, J.L. Orrock, and J.J. Tewksbury.  2016.  Connectivity from a different perspective: comparing seed dispersal kernels in connected vs. unfragmented landscapes.  Ecology 1274-1282 [PDF reprint]

Levey, D.J., Caughlin, T.T., Brudvig, L.A., Haddad, N.M., Damschen, E.I., Tewksbury, J.J., Evans, D.M. 2016. Disentangling fragmentation effects on herbivory in understory plants of longleaf pine savanna.  Ecology 97:2248-2258 [PDF reprint]

2015

Haddad, N.M. 2015. Corridors for nature, Corridors for people: How can the environmental impacts of roads be reduced? Science 350:1166-1167. [PDF reprint] [html text] [summary]

Chaplin-Kramer, R., I. Ramler, R. Sharp, N.M. Haddad, J.S. Gerber, P. West, L. Mandle, P.C. Engstrom, A. Baccini, S. Sim, C. Mueller, and H. King. 2015.  Degradation in carbon stocks near tropical forest edges.  Nature Communications 6:10158 | DOI:10.1038/ncomms10158 [PDF reprint]

Brudvig, L.A., E.I. Damschen, N.M. Haddad, D.J. Levey, and  J.J. Tewksbury. 2015. The influence of habitat fragmentation on multiple plant-animal interactions and plant reproduction.  Ecology 96:2669-2678.  [PDF reprint]

Aschehoug, E.T., F.S. Sivakoff, H.L. Cayton, W.F. Morris, and N.M. Haddad. 2015. Habitat restoration affects immature stages of a wetland butterfly through indirect effects on predation. Ecology 96:1761-1767. [PDF reprint]

Cayton, H., N.M. Haddad, K. Gross, S.E. Diamond, and L. Ries. 2015. Do growing degree days predict phenology across butterfly species? Ecology 96:1473-1479. [PDF reprint]

Cayton, H., N.M. Haddad, B. Ball, E. Henry, and E. Aschehoug. 2015. Habitat restoration as a recovery tool for a disturbance-dependent butterfly, the endangered St. Francis’ Satyr.  Pages 147-159 in Daniels, J.C. (editor) Butterfly Conservation in North America.  [PDF reprint]

Haddad, N.M., L.A. Brudvig, J. Clobert, K.F. Davies, A. Gonzalez, R.D. Holt, T.E. Lovejoy, J.O. Sexton, M.P. Austin, C.D. Collins, W.M. Cook, E.I. Damschen, R.M. Ewers, B.L. Foster, C.N. Jenkins, A.J. King, W.F. Laurance, D.J. Levey, C.R. Margules, B.A. Melbourne, A.O. Nicholls, J.L. Orrock, D.-X. Song, and J.R. Townshend. 2015. Habitat fragmentation and its lasting impact on Earth’s ecosystems. Science Advances 1, e1500052.  [PDF reprint]

Henry, E.H., N.M. Haddad, J. Wilson, P. Hughes, and B. Gardner. 2015. Point-count methods to monitor butterfly populations when traditional methods fail: a case study with Miami blue butterfly. Journal of Insect Conservation 19:519-529. [PDF reprint]

Haddad, N.M. 2015. Conservation and restoration for the endangered St. Francis’ Satyr. News of the Lepidopterists’ Society 57:33-35. [PDF reprint]

Diamond, S.E., R.R. Dunn, S.D. Frank, N.M. Haddad, and R.A. Martin. 2015. Shared and unique responses of insects to the interaction of urbanization and background climate. Current Opinion in Insect Science 11:71-77. [PDF reprint]

2014

Breckheimer, I, N.M. Haddad, W.F. Morris, A.M. Trainor, W.R. Fields, R.T. Jobe, B.R. Hudgens, A. Moody, and J.R. Walters. 2014.  Defining and evaluating the umbrella species concept for conserving and restoring landscape connectivity. Conservation Biology 28:1584-1593. [PDF reprint]

Damschen, E.I., D.V. Baker, G. Bohrer, R. Nathan, J.L. Orrock, J.R. Turner, L.A. Brudvig, N.M. Haddad, D.J. Levey, and J.J. Tewksbury. 2014. How fragmentation and corridors affect wind dynamics and seed dispersal in open habitats. Proceedings of the National Academy of Sciences 111:3484-3489. [PDF reprint]

Resasco, J. N.M. Haddad, J.L. Orrock, D. Shoemaker, L.A. Bruvig, E.I. Damschen, J.J. Tewksbury, and D.J. Levey.  2014.  Landscape corridors can increase invasion by an exotic species and reduce diversity of native species.  Ecology 95:233-239. [PDF reprint]

Haddad, N.M., L.A. Brudvig, E.I. Damschen, D.M. Evans, B.L. Johnson, D.J. Levey, J.L. Orrock, J. Resasco, L.L. Sullivan, J.J. Tewskbury, S.A. Wagner, and A.J. Weldon.  2014. Potential negative ecological effects of corridors.  Conservation Biology 28:1178-1187. [PDF reprint]

Diamond, S.E., H. Cayton, T. Wepprich, C.N. Jenkins, R.R. Dunn, N.M. Haddad, L. Ries. 2014. Unexpected phenological responses of butterflies to the interaction of urbanization and geographic temperature.  Ecology 95:2613-2621. [PDF reprint]

Adrion, J.R., A. Kousathanas, M. Pascual, H.J. Burrack, N.M. Haddad, A.O. Bergland, H. Machado, T.B. Sackton, T.A. Schlenke, M. Watada, D. Wegmann, and N.D. Singh.  2014. Drosophila suzukii: the genetic footprint of a recent, world-wide invasion. Molecular Biology and Evolution 31:3148-3163. [PDF reprint]

2013

Wilson, J.W., J.O. Sexton,  R.T. Jobe, and N.M. Haddad.  2013.  The relative contribution of terrain, land cover, and vegetation structure indices to species distribution models.  Biological Conservation 164:170–176. [PDF reprint]

Mata, T.M., N.M. Haddad, and M. Holyoak.  2013.  How invader traits interact with resident communities and resource availability to determine invasion success.  Oikos 122: 149–160 [PDF reprint]

2012

Haddad, N.M.  2012.  Connecting ecology and conservation through experiment.  Nature Methods 794-795.  [PDF reprint]

Dinnage, R., M.W. Cadotte, N.M. Haddad, G.M. Crutsinger, and D. Tilman.  2012.  Diversity of plant evolutionary lineages promotes arthropod diversity.  Ecology Letters 15:1308-1317. [PDF reprint]

Hudgens, B.R., W.F. Morris, N.M. Haddad. W. Fields, J. Wilson, D.C. Kuefler, and R.T. Jobe.  2012.  How complex do models need to be to predict dispersal of threatened species through matrix habitats?  Ecological Applications 22:1701-1710.  [PDF reprint]

Milko, L.V., N.M. Haddad, and S.L. Lance.  2012.  Dispersal via stream corridors structures populations of the endangered St. Francis’ satyr butterfly (Neonympha mitchellii francisci).  Journal of Insect Conservation 16:263-273.  [PDF reprint]

2011

Leidner, A.K. and N.M. Haddad.  2011.  Combining measures of dispersal measures to identify conservation strategies in fragmented landscapes.  Conservation Biology 25:1022-1031.  [PDF reprint]

Johnson, B.L., and N.M. Haddad. 2011. Edge effects, not connectivity, determine the incidence and development of a foliar fungal plant disease. Ecology 92:1551-1558. [PDF reprint]

Sullivan, L.L., B.L. Johnson, L.A. Brudvig, and N. Haddad. 2011. Can dispersal mode predict corridor effects on plant parasites? Ecology 92:1559-1564. [PDF reprint]

Haddad, N.M., G.M. Crutsinger, K. Gross, J. Haarstad, and D. Tilman. 2011.  Plant diversity and the stability of foodwebs.  Ecology Letters 14:42-46.  [PDF reprint]

Haddad, N.M., B. Hudgens, E.I. Damschen, D.J. Levey, J.L. Orrock, J.J. Tewksbury, and A.J. Weldon.  2011.  Assessing positive and negative ecological effects of corridors.  Pages 475-503 in J. Liu, V. Hull, A.T. Morzillo, and J.A. Wiens, Sources, sinks, and sustainability, Cambridge University Press, Cambridge, UK [PDF reprint]

2010

Bartel, R.A., N.M. Haddad, J.P. Wright.  2010.  Ecosystem engineers maintain rare species and increase biodiversity.   Oikos 119:883-890.  [PDF reprint]

Krosby, M., J. Tewksbury, N.M. Haddad, and J. Hoesktra.  2010.  Landscape connectivity for a changing climate.  Conservation Biology 24:1686-1689.  [PDF reprint]

Kuefler, D., B. Hudgens, N.M. Haddad, W.F. Morris, and N. Thurgate. 2010.  The conflicting role of matrix habitats as conduits and barriers for dispersal.  Ecology 91:944-950. [PDF reprint]

Leidner, A.K. and N.M. Haddad.  2010.  Natural, not urban, barriers limit dispersal of a coastal endemic butterfly.  Conservation Genetics 11:2311-2320. [PDF reprint]

Leidner, A.K., Haddad, N.M., and Lovejoy, T.E.  2010.  Does tropical forest fragmentation increase long-term variability of butterfly communities?  PLoS ONE 5(3):e9534. doi:10.1371/journal.pone.0009534 [PDF reprint]

2009

Brudvig, L.A., E.I. Damschen, J.J. Tewksbury, N.M. Haddad, and D.J. Levey.  2009.  Corridors promote biodiversity spillover into adjacent habitat.  Proceedings of the National Academy of Sciences 106:9328-9332  [PDF reprint]

Haddad, N.M., G.M. Crutsinger, K. Gross, J. Haarstad, J.M.H. Knops, and D. Tilman.  2009.  Plant species loss decreases arthropod diversity and shifts trophic structure.   Ecology Letters 12:1029-1039 [PDF reprint]  [Supplementary text]

Haddad, N.M.  2009.  Principles of reserve design.  Pages 529-537 in S. Levin, editor, Princeton Guide to Ecology.  Princeton University Press, New Jersey

Wells, C.N., R.S. Williams, G.L. Walker, and N.M. Haddad.  2009.  Effects of habitat connectivity on genetic variation of the buckeye butterfly (Junonia coenia) in a landscape experiment.  Southeastern Naturalist 8:709-722 [PDF reprint]

2008

Damschen, E.I., L.A. Brudvig, N.M. Haddad, D.J. Levey, J.L. Orrock, and J.J. Tewksbury.  2008.  The movement ecology and dynamics of plant communities in fragmented landscapes.  Proceedings of the National Academy of Sciences 105:19078-19083.  [PDF reprint]

Haddad N.M.  2008.  Finding the corridor more traveled.  Proceedings of the National Academy of Sciences 105:19569-19570. [PDF reprint]

Haddad, N.M., B. Hudgens, C. Damiani, K. Gross, D. Kuefler, and K. Pollock.  2008.  Determining optimal monitoring for rare butterfly populations.  Conservation Biology 22:929-940.  [PDF reprint]

Haddad, N.M., M. Holyoak, T.M. Mata, K.F. Davies, B.A. Melbourne, and K. Preston.  2008.  Species’ traits predict the effects of disturbance and productivity on diversity.  Ecology Letters 11:348-356.  [PDF reprint][Supplementary text] 

Kuefler, D., N.M. Haddad, S. Hall, B. Hudgens, B. Bartel, and E. Hoffman.  2008.  Distribution, population structure, and habitat use of the endangered St. Francis’ satyr butterfly, Neonympha mitchellii francisci.  American Midland Naturalist  159:298-320.  [PDF reprint]

2007

Gross, K., E.J. Kalendra, B.R. Hudgens, and N.M. Haddad.  2007.  Robustness and uncertainty in estimates of butterfly abundance from transect counts.  Population Ecology 49:191-200.  [PDF reprint]

2006

Damschen, E.I., N.M. Haddad, J.L. Orrock, J.J. Tewksbury, and D.J. Levey.  2006.  Corridors increase plant species richness at large scales.  Science 313:1284-1286.  [PDF reprint]

Haddad, N.M. and J.J. Tewksbury.  2006.  Impacts of corridors on populations and communities.  Pages 390-415 in K. Crooks and M. Sanjayan, editors, Connectivity Conservation, Cambridge University Press, Cambridge, England. [PDF reprint]

Kuefler, D. and N.M. Haddad.  2006.  Local versus landscape determinants of butterfly movement behaviors. Ecography 29:549-560. [PDF reprint]

2005

Brinkerhoff, R.J., N.M. Haddad, and J.L. Orrock.  2005.  Corridors and olfactory predator cues affect small mammal behavior.  Journal of Mammalogy 86:662-669. [PDF reprint]

Damschen, E.I., K.M. Rosenfeld, M. Wyer, D. Murphy-Medley, T.R. Wentworth, and N.M. Haddad.  2005. Visibility matters: increasing knowledge of women’s contributions to ecology.  Frontiers in Ecology and the Environment 3:212-219.  [PDF reprint]

Haddad, N.M. 2005. Butterflies of the Savannah River Site. Pp. 175-184. In J. Kilgo and J. Blake, eds, Ecology and Management of a Forested Landscape, Island Press, Washington, DC.

Haddad, N.M. and J.J. Tewksbury.  2005.  Low quality habitat corridors as movement conduits for two butterfly species.  Ecological Applications 15:250-257.  [PDF reprint]

Levey, D.J., B.M. Bolker, J.J. Tewksbury, S. Sargent, and N.M. Haddad.  2005.  Effects of landscape corridors on seed dispersal by birds.  Science 309:146-148.   [PDF reprint]  [review article in Science]

Levey, D.J., B.M. Bolker, J.J. Tewksbury, S. Sargent, and N.M. Haddad.  2005.  Landscape corridors: Possible dangers? (response).  Science 310:779-783.  [PDF reprint]

Weldon, A.J. and N.M. Haddad.  2005.  The effects of patch shape on Indigo Buntings: evidence for an ecological trap.  Ecology 86:1422-1431. [PDF reprint]

2003

Bradley, K.L., E.I. Damschen, L.M. Young, D. Kuefler, S. Went, G. Wray, N.M. Haddad, J.M.H. Knops, and S.M. Louda.  2003.  Spatial heterogeneity, not visitation bias, dominates variation in herbivory. Ecology 84:2214-2221. [PDF reprint]

Haddad, N.M., D.R. Bowne, A. Cunningham, B. Danielson, D. Levey, S. Sargent, and T. Spira.  2003.  Corridor use by diverse taxa.  Ecology 84:609-615. [PDF reprint]

Hudgens, B.R. and N.M. Haddad.  2003.  Predicting which species will benefit from corridors in fragmented landscapes from population growth models.  The American Naturalist 161:808-820.  [PDF reprint]

2002

Haddad, N.M., D. Tilman, and J.M.H. Knops.  2002.  Long-term oscillations in grassland productivity induced by drought.  Ecology Letters 5:110-120. [PDF reprint]

Sisk, T.D., and N.M. Haddad.  2002.  Incorporating the effects of habitat edges into landscape models:  Effective area models for management.  Pp. 208-240 in J. Liu and W.W. Taylor, Integrating landscape ecology into natural resource management, Cambridge University Press, Cambridge, UK.

Tewksbury, J.J., D.J. Levey, N.M. Haddad, S. Sargent, J.L. Orrock, A. Weldon, B.J. Danielson, J. Brinkerhoff, E.I. Damschen, and P. Townsend.  2002.  Corridors affect plants, animals, and their interactions in fragmented landscapes. Proceedings of the National Academy of Sciences 99:12923-12926.  Outstanding Paper Award in Landscape Ecology [PDF reprint]

2001

Haddad, N.M., D. Tilman, J. Haarstad, M. Ritchie, and J. Knops.  2001.  Contrasting effects of plant richness and composition on insect communities: a field experiment.  The American Naturalist 158:17-35. [PDF reprint]

2000

Haddad, N.M. 2000. Corridor length and patch colonization by a butterfly, Junonia coenia. Conservation Biology 14:738-745. [PDF reprint]

Haddad, N.M., D.K. Rosenberg, and B.R. Noon. 2000. On experimentation and the study of corridors.  Conservation Biology 14:1543-1545. [PDF reprint]

Haddad, N.M., J. Haarstad, and D. Tilman. 2000. The effects of long-term nutrient loading on grassland insect communities. Oecologia 124:73-84. [PDF reprint]

Haddad, N.M. and W.M. Hicks. 2000. Host pubescence and the behavior and performance of a butterfly, Papilio troilus (Lepidoptera). Environmental Entomology 29:299-303.  [PDF reprint]

1999

Haddad, N.M. 1999. Corridor use predicted from behaviors at habitat boundaries. The American Naturalist 153:215-227. [PDF reprint]

Haddad, N.M. 1999. Corridor and distance effects on interpatch movements: a landscape experiment with butterflies. Ecological Applications 9:612-622.  [PDF reprint]

Haddad, N.M. and K. Baum. 1999. An experimental test of corridor effects on butterfly densities. Ecological Applications 9:623-633.  [PDF reprint]

Knops, J.M.H., D. Tilman, N.M. Haddad, S. Naeem, C.E. Mitchell, J. Haarstad, M.E. Ritchie, K.M. Howe, P.B. Reich, E. Siemann, and J. Groth. 1999.  Cascading effects of plant diversity on invasions, diseases, and insects. Ecology Letters 2:286-293. [PDF reprint]

pre-1999

Sisk, T.D., N.M. Haddad, and P.R. Ehrlich. 1997. Bird assemblages in patchy woodlands: modeling the effects of edge and matrix habitats.  Ecological Applications 7:1170-1180.  [PDF reprint]

Austin, G.T., N.M. Haddad, C.A. Mendez, A.E. Launer, and P.R. Ehrlich. 1996. Annotated checklist of the butterflies of the Tikal National Park area of Guatemala. Tropical Lepidoptera 7:21-37. [PDF reprint]

Mendez, C.A., T.D. Sisk, and N.M. Haddad.  1995.  Beyond birds: multitaxonomic monitoring programs provide a broad measure of tropical diversity. Pages 451-456 in J.A. Bissonette and P.R. Krausman, eds. Integrating people and wildlife for a sustainable future. Proceedings of the First International Wildlife Management Congress. The Wildlife Society, Bethesda, MD.

Pulliam, H.R. and N.M. Haddad. 1994. Human population growth and the carrying capacity concept. Bulletin of the Ecological Society of America. 75:141-157. [PDF reprint]

Daily, G.C., P.R. Ehrlich, and N.M. Haddad. 1993. Double keystone bird in a keystone species complex. Proceedings of the National Academy of Sciences 90:592-594.  [PDF reprint]