Publications   [Google Scholar Citations]

McDermott, M. T., P. Doak, C. M. Handel, G.A. Breed, C.P.H. Mulder. 2018. Willow drives changes in arthropod communities across tundra-shrub gradients of northwestern Alaska: Ecological implications of shrub expansion. In Revision.

Eisaguirre, J. M., M. Auger-Méthé, C. P. Barger, S. B. Lewis, C. L. McIntyre, T. L. Booms, and G. A. Breed. 2018. Complex stopover and migratory behavior revealed using mechanistic movement models with environmentally driven dynamic parameters. In Review: Oecologia

Eisaguirre, J. M., T. L. Booms , C. P. Barger , C. L. McIntyre , S. B. Lewis, and G. A. Breed. 2018. Local meteorological conditions reroute a migration. In Press: Proc. Roy. Soc. B.

Johns, M.E., P. Warzybok, R.W. Bradley, J. Jahncke, M. Lindberg and G.A. Breed. 2018. Extreme reproductive investment associated with greater survival in a long-lived seabird, the Cassin’s auklet. Proc. Roy. Soc. B. 285:20181464 [pdf]

Smith, J., S Karpovich, G. A. Breed, and D M O’Brien. 2018. Morphological characteristics of harbor seal (Phoca vitulina) whiskers and their use in dietary reconstruction using stable isotope ratios. In Press: Canadian J. Zoology.

Cameron, M.D., K. Joly, G. A. Breed, L.S. Parrett, and K Kielland. 2018. Movement-based methods to infer parturition events in migratory ungulates. In Press: Canadian J. Zoology.

Severns, P. M. and G. A. Breed. 2018. Male harassment influences female movements and genetic architecture in a fragmented metapopulation network. In Press: Ecography.

Breed, G.A., M.F. Cameron, J.M. Ver Hoef, P.L. Boveng, A. Whiting, and K.J. Frost. 2018. Seasonal sea ice dynamics drive movement and migration of juvenile bearded seals (Erignathus barbatus) Mar. Ecol. Prog. Ser. 600:223-237 [pdf]

Beltran, R.S., J.M. Burns, and G.A. Breed. 2018. Convergence of biannual molting strategies across endothermic vertebrates. Proc. Roy. Soc. B 285:20180318. [pdf]

Cameron, M.F., K. J. Frost, J. M. Ver Hoef, G. A. Breed, A. V. Whiting, J. Goodwin and P. L. Boveng. 2018. Habitat selection and seasonal movements of young bearded seals (Erignathus barbatus) in the Bering Sea. Plos one 13(2):e0192743. [pdf]


Breed, G. A., C. J. D. Matthews, M. Marcoux, J. W. Higdon, B. LeBlanc, S. D. Petersen, J. Orr, N. R. Reinhart, and S. H. Ferguson. 2017. Sustained disruption of narwhal habitat use and behavior in the presence of Arctic killer whales. Proceedings of the National Acedemy of Sciences 114(10): 2628-2633. [pdf]

Johns, M. E., P. Warzybok, R. W. Bradley, J. Jahncke, M. Lindberg, Breed, G. A. 2017. Age, timing, and a variable environment affect double brooding attempts of a long-lived seabird. Mar. Ecol. Prog. Ser. 564: 187-197. [pdf]

Brown, L. M., G. A. Breed, P. M. Severns, E. E. Crone. 2017. Implications of a novel host plant for herbivore population dynamics. Oecologia 183(2): 441-453. [pdf]

Breed, G. A., E. A. Golson and M. T. Tinker. 2017. Predicting animal home-range structure and transitions using a multistate Ornstein-Uhlenbeck correlated random walk. Ecology 98(1): 32-47. [pdf]


Sexson, M. G., M. R. Petersen, G. A. Breed, and A. N. Powell. 2016. Shifts in the distribution of molting Spectacled Eiders (Somateria fischeri) as an indicator of ecosystem change in the Arctic.  Condor 118(3):463-476. [pdf]

Demars, C., G. A. Breed, J. R. Potts, and S. Boutin. 2016. Spatial patterning of prey at reproduction to reduce predation risk: what drives dispersion from groups?  Am. Nat. 187(5):678-687.[pdf]


Breed, G. A. and P. M. Severns. 2015. Unexpectedly high precision of consumer-grade GPS units for small-scale animal movement studies.  PeerJ  3e:1205. [pdf]

Breed, G. A., P. M. Severns, and A. M. Edwards. 2015. Apparent power-law step length distributions can arise from intraspecific interactions. J. Roy. Soc. Interface 12:20140927. [pdf]


Luque, S. P. , S. H. Ferguson and G. A. Breed*. 2014. Spatial behaviour of a keystone Arctic marine predator and implications of climate warming in Hudson Bay. J. Exp. Mar. Bio. Ecol. 461:504-515. [pdf] *Corresponding author

Severns, P. M. and G. A. Breed. 2014. Behavioral consequences of exotic host plant adoption and the differing roles of male harassment on female movement in two checkerspot butterflies. Behavioral Ecology and Sociobiology 68 (5), 805-814. [pdf]


Maxwell, S. M., E. L. Hazen, S. J. Bograd, B. S. Halpern, B. Nickel, G. A. Breed, B. A. Block, H. Bailey, M. A. Kappes and D. P. Costa. 2013. Pelagic predator distributions and impacts: implications for effective spatial management of the oceans. Nature Communications 4:2688. [pdf]

Breed, G. A., W. Don Bowen and M. L. Leonard. 2013.  Behavioral signature of intraspecific competition and density-dependence in colony breeding marine predators.  Ecology and Evolution, DOI: 10.1002/ece3.754. [pdf]

Fagan, W. F., M. A. Lewis, M. Auger-Méthé, T. Avgar, S. Benhamou, G. A. Breed, L. LaDage, U. Schlaegel, W. Tang, Y. Papastamatiou, J. Forester, and T. Mueller. 2013. Spatial memory and animal movement. Ecology Letters 16(10):1316-1329. [pdf]

Breed, G. A.,  S. Stitcher and E. E. Crone. 2013. Climate-driven changes in northeastern US butterfly communities.  Nature Climate Change 3: 142-145. [pdf]

Breed, G. A. and S. Stichter. 2013. Shifting North: Warmer climates are changing the ranges of just about everything. American Butterflies 20 (3/4): 4-15. [pdf]


Edwards, A. M., M. P. Freeman, G. A. Breed, and I. D. Jonsen. 2012. Incorrect likelihood methods were used to infer scaling laws of marine predator search behaviour. Plos One 7(10): e45174. [pdf]

Costa, D. P., G. A. Breed, and P. W. Robinson. 2012. New insights into pelagic migrations: ecology and conservation.  Annu. Rev. Ecol. Evol. Syst. 43:73-96. [pdf]

Harvey, V., M.O. Hammill, D.P. Swain, G. A. Breed, C. Lydersen and K.M. Kovacs. 2012. Winter foraging by a top predator, the grey seal, in relation to the distribution of prey. Mar. Eco. Prog. Ser.  462:273-286. [pdf]

Breed, G. A., , D. P. Costa, P.W. Robinson, I. D. Jonsen J. Mills-Flemming. 2012. State-space methods for better inference of behavioral dynamics in tracked animals.  Ecological Modelling  235-236:49-58. [pdf]

Maxwell S. M., J. J. Frank, G. A. Breed, P. W. Robinson, S. A. Simmons, D. E. Crocker, J. P. Gallo- Reynoso, D. P. Costa. 2012. Benthic foraging on seamounts by a deep diving marine mammal. Mar. Mamm. Sci. 28(3): e333-e344. [pdf]


Benoıt, H. P., D. P. Swain, W. D. Bowen, G. A. Breed, M. O. Hammill, and V. Harvey. 2011. Can predation by grey seals explain elevated natural mortality in three fish species in the southern Gulf of St. Lawrence? Mar. Eco. Prog. Ser. 442:149-167. [pdf]

Maxwell, S. M., G. A. Breed, B. J. Godley, R. J. Parnell, J. Makanga-Bahouna, E. Pemo-Makaya, S. Ngouessono, B. Nickel, A. Formia, D. P. Costa and M. S. Coyne. Internesting behavior and movements of olive ridley sea turtles (Lepidochelys olivacea) in Gabon, Africa. 2011. Plos One 6(5):e19905. [pdf]

Breed, G. A., W. D. Bowen, and M. L. Leonard. 2011. Development of foraging strategies with age in a long-lived marine predator. Mar. Eco. Prog. Ser. 431: 267–279. [pdf]

Block, B., I. Jonsen, S. Jorgensen, A. Winship, S. Shaffer, S. Bograd, E. Hazen, D. Foley, G. A. Breed, A.-L. Harrison, J. Ganong, A. Swithenbank, M. Castleton, H. Dewar, B. Mate, G. L. Shillinger, K. M. Schaefer, S. R. Benson, M. J. Weise, R. W. Henry and D. Costa. 2011. Tagging of Pacific Pelagics: Tracking apex marine predator movements in a dynamic ocean. Nature 475: 86-90. [pdf]

Breed, G. A., D. P. Costa., M. E. Goebel and P. W. Robinson. (2011) Electronic tracking tag programming is critical to data collection for behavioral time-series analysis. Ecosphere , 2:art10. [pdf]


Breed, G. A., I. D. Jonsen, R. A. Myers, W. D. Bowen, and M. L. Leonard. 2009. Sex-specific, seasonal foraging tactics of adult grey seals (Halichoerus grypus) revealed by state-space analysis. Ecology 90:3209-3221 [pdf].


Green, R. E., G. A. Breed, M. J. Dagg, and T. S. Bianchi. 2008. Modelling ecosystem responses to changing nutrients in the Mississippi River Plume. Cont. Shelf Res. 28:1451-1465 [pdf].


Breed, G. A., W. D. Bowen, J. I. McMillan, and M. L. Leonard. 2006. Sexual segregation of seasonal foraging habitats in a non-migratory marine mammal. Proc. R. Soc. B 273:2319-2326 [pdf].

Green, R. E., T. S. Bianchi, M. J. Dagg, N. D. Walker, and G. A. Breed. 2006. An organic carbon budget for the Mississippi River turbidity plume and plume contributions to air-sea CO2 fluxes and bottom water hypoxia. Estuaries and Coasts. 29:579-597 [pdf].


Dagg, M. J., T. S. Bianchi, G. A. Breed, W.-J. Cai., S. Duan, H. Liu, B. M. McKee, R. T. Powell, and M. Stewart. 2005. Biogeochemical characteristics of the lower Mississippi River, USA, during June 2003. Estuaries and Coasts 28:664-674 [pdf].


Breed, G. A., G. A. Jackson, and T. L. Richardson. 2004. Sedimentation, carbon export, and food web structure in the Mississippi River plume described by inverse analysis. Mar. Eco. Prog. Ser. 278:35-51 [pdf].


Dagg, M. J., and G. A. Breed. 2003. Biological effects of Mississippi River nitrogen on the Northern Gulf of Mexico: A Review and Synthesis. J. Mar. Sys. 43:133-152 [pdf].

Buck, T. L., G. A. Breed, S. C. Pennings, M. E. Chase, M. Zimmer, and T. H. Carefoot. 2003. Diet choice in an omnivorous salt marsh crab: Different food types, claw allometry, and habitat complexity. J. Exp. Mar. Bio. Ecol. 292:103-116 [pdf].

Selected Papers In Progress

Breed, G. A., D. Goodsman, and M. A. Lewis. 201X. Male harassment, density-dependent emigration, and stability in butterfly metapopulation networks. Target: American Naturalist.

Golson, E. A., G. A. Breed, M. T. Tinker, and J. T. Harvey. 201X. Mechanistically modelling sea otter movement to predict the impacts of oil spills. Target: Ecological Applications.

Breed, G. A. and M. A. Lewis. 201X. Optimal exploration of habitat by animals. Target: American Naturalist.


Breed, G.A. 2002. Carbon flow and ecosystem dynamics in the Mississippi River plume described by inverse analysis. M.S. thesis.  Texas A&M University, College Station, TX, USA. [ pdf ]

Breed, G.A. 2008. State-space analyses indicate experience, prey availability, competition, and reproductive status drive foraging behaviour in a top marine predator.  Ph.D. thesis.  Dalhousie University, Halifax, NS, Canada. [ pdf ]

Last update June 2018