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Peter Bloom

Peter Bloom


I am a southern California biologist who has been doing independent research on a wide variety of ecological and conservation oriented topics related to raptors and their habitats.

Bloom Biological, Inc.
13611 Hewes Avenue  
Santa Ana,  CA  92705  United States
Phone: 714-544-6147 Fax: 714-832-4414
Email: petebloom@bloombiological.com

   Research Interests

Habitat and home range use, natal dispersal, breeding dispersal, territory and mate fidelity, survivorship, migration, food habits, population ecology, reproductive success, status, habitat conservation, lead poisoning, urban populations, wind farms, etc.
I am also have a research interest in owls, including Barn Owl, Great Horned Owl, Long-eared Owl, Short-eared Owl, and Western Screech-owl.

Species of Interest: 
  • Barn Owl
  • Great Horned Owl
  • Western Screech-owl
  • Long-eared Owl
  • Short-eared Owl
  • American Kestrel
  • California Condor
  • Cooper's Hawk
  • Golden Eagle
  • Red-shouldered Hawk
  • Red-tailed Hawk
  • Rough-legged Hawk
  • Swainson's Hawk
  • Turkey Vulture


Chiang, S.N., P.H. Bloom, A.M. Bartuszevige, and S.E. Thomas. 2012. Home range and habitat use of Cooper's Hawks in urban and natural areas. In C.A. Lepczyx and P.S. Warren (eds.), Urban bird ecology and conservation. Studies in Avian Biology No. 45. University of California of California Press. www.ucpress.edu/go/sab

Bloom, P.H. 2011. Vagrancy, natal dispersal, and migrations of Red-tailed Hawks and Red-shouldered Hawks banded in the Pacific Flyway. Ph.D. dissertation, University of Idaho, Moscow, ID. 131 pgs.

Bloom, P.H., J.M. Scott, J.M. Papp, S.E. Thomas, and J.W. Kidd. 2011. Vagrant Western Red-shouldered Hawks: origins, natal dispersal patterns, and survival. Condor 113:538-546.        pdf

Kelly, T.R., P.H. Bloom, S.G. Torres, Y.Z. Hernandez, R.H. Poppenga, W.M. Boyce, and C.K. Johnson. 2011. Impact of California lead ammunition ban on reducing lead exposure in Golden Eagles and Turkey Vultures. PLoS ONE 6(4):e17656. doi:10.1371/journal.pone.0017656        pdf

Muralidharan, S., V. Dhananjayan, R. Risebrough, V. Prakash, R. Jayakumar, and P.H. Bloom. 2008. Persistent organochlorine pesticide residues in tissues and eggs of White-backed Vulture, Gyps bengalensis from different locations in India. Bulletin of Environmental Contamination and Toxicology 81:561-565. DOI:10.1007/s.00128-008-9529-z.        pdf

Pagel, J.E., J. Linthicum, and P.H. Bloom. 2008. Brian James Walton, 1951-2006. Journal of Raptor Research 42:75-76.

Bloom, P.H., W.S. Clark, and J.W. Kidd. 2007. Capture techniques. Pp. 193-219 in D.M. Bird and K.L. Bildstein (eds.), Raptor research and management techniques. Hancock House Publishers, Surrey, British Columbia.

Lincer, J.L., and P.H. Bloom. 2007. The status of the Burrowing Owl in San Diego County, California. Pp. 90-102 in Proceedings of the California Burrowing Owl Symposium. Institute for Bird Populations.       pdf

Bennett, J.R., and P.H. Bloom. 2005. Home range and habitat use by Great Horned Owls (Bubo virginianus) in southern California. Journal of Raptor Research 39:119-126.       pdf

Clark, W. S. and P. H. Bloom. 2005. Basic II and Basic III plumages of Rough-legged Hawks. Journal of Field Ornithology 76: 83-89.

Houston, C. S. and P. H. Bloom. 2005. Turkey Vulture marking history: the switch from leg bands to patagial tags. North American Bird Bander 30: 59-64.

Bloom, P. H. 2001. Molt and sequence of plumages of Golden Eagles and a technique for in-hand ageing. North American Bird Bander 26: 97-116.

Hull, B., and P. Bloom. 2001. The North American bander's manual for raptor banding techniques. North American Banding Council, Point Reyes Station, CA. 22 pp.

Collins, C.T., and P.H. Bloom. 2000. The status of Harlan's Hawk in southern California. Western Birds 31:200-202.       pdf

Goldstein, M.I., P.H. Bloom, J.H. Sarasola, and T.E. Lacher. 1999. Post-migration weight gain of Swainson's Hawks in Argentina. Wilson Bulletin 111:428-432.       pdf

Bloom, P. H. 1998. (Review of) The raptors of Arizona, edited by Richard Glinski. Journal of Raptor Research 32:349.

Hall, L. S., M. L. Morrison, and P. H. Bloom. 1997. Population status of the endangered Hawaiian Hawk. Journal of Raptor Research 31: 11-15.       pdf

Tietje, W.D., P.H. Bloom, and J.K. Vreeland. 1997. Characteristics of Red-tailed Hawk nest sites in oak woodlands of central California. Pacific Southwest Forest and Range Experiment Station, General Technical Report PSW-160:365-372.       pdf

Bloom, P.H. and M.D. McCrary. 1996. The urban buteo: Red-shouldered Hawks in southern California. Pp. 31-39 in D.M. Bird, D.E. Varland, and J.J. Negro (eds.), Raptors in human landscapes. Academic Press and Raptor Research Foundation, San Diego, CA.

Bloom, P. H. 1995. (Review of) A photographic guide to North American raptors, Bryan K. Wheeler and Willam S. Clark. Journal of Raptor Research 29:286.

Schmutz, J.K., P.H. Bloom, and S.J. Hawks. 1995. (Abstract) Sexual and geographical color variation among Swainson's Hawks. Journal of Raptor Research 29:51.

Woodbridge, B., K. Finley, and P.H. Bloom. 1995.(Abstract) Annual turnover and reproductive success of marked adult Swainson's Hawks in the Butte Valley, California. Journal of Raptor Research 29:51-52.

Woodbridge, B., K. K. Finley, and P. H. Bloom. 1995. Reproductive performance, age structure, and natal dispersal of Swainson's Hawks in the Butte Valley, California. Journal of Raptor Research 29: 187-192.       pdf

Bloom, P.H. 1994. The biology and current status of the Long-eared Owl in coastal southern California. Bulletin of the Southern California Academy of Sciences 93:1-12.

Bloom, P.H., M.D. McCrary, and M.J. Gibson. 1993. Red-shouldered Hawk home range and habitat use in southern California. Journal of Wildlife Management 57:258-265.

Garrison, B. A. and P. H. Bloom. 1993. Natal origins and winter site fidelity of Rough-legged Hawks wintering in California. Journal of Raptor Research 27: 116-118.       pdf

Bloom, P. H., J. L. Henckel, E. H. Henckel, J. K. Schmutz, B. Woodbridge, J. R. Bryan, R. L. Anderson, P. J. Detrich, T. L. Maechtle, J. O. McKinley, M. D. McCrary, K. Titus, and P. F. Schempf. 1992. The dho-Gaza with Great Horned Owl lure: an analysis of its effectiveness in capturing raptors. Journal of Raptor Research 26: 167-178.       pdf

McCrary, M.D., P.H. Bloom, and M.J. Gibson. 1992. Observations of the behavior of surplus adults in a Red-shouldered Hawk population. Journal of Raptor Research 26: 10-12.       pdf

Bloom, P. H. 1991. (Review of) Hawks, eagles, and falcons of North America, by P. A. Johnsgard. Auk 108:740-741.

Bloom, P.H. 1991. An analysis of the potential hazards of diurnal raptors to aircraft at Long Beach Airport. Unpublished report prepared for Long Beach Airport. Long Beach City Airport, Long Beach, CA.

Pattee, O. H., P. H. Bloom, J. M. Scott, and M. R. Smith. 1990. Lead hazards within the range of the California Condor. Condor 92: 931-937.       pdf

Risebrough, R.W., A.M. Springer, S.A. Temple, C.M. White, J.L.B. Albuquerque, P.H. Bloom, R.W. Fyfe, M.N. Kirven, B.A. Luscombe, D.G. Roseneau, M. Sander, N.J. Schmitt, C.G. Thelander, W.G. Vasina, and W. Walker II. 1990. [Observations of the Peregrine Falcon, Falco peregrinus subspecies, in South America]. Revista Brasileira de Biologia 50: 563-574. (In Portuguese with English summary)

Bloom, P. H. 1989. Red-shouldered Hawk home range and habitat use in southern California. M.Sc. thesis, California State University, Long Beach, CA.

Bloom, P. H. J. M. Scott, O. H. Pattee, and M. R. Smith. 1989. Lead contamination of Golden Eagles Aquila chrysaetos within the range of the California Condor Gymnogyps californianus. Pp. 481-482 in: Meyburg, B.-U. and R. D. Chancellor (eds.), Raptors in the modern world. World Working Group on Birds of Prey and Owls, Berlin, Germany.

Clark, W. S. and P. H. Bloom, and L. W. Oliphant. 1989. Aplomado Falcon steals prey from Little Blue Heron. Journal of Field Ornithology 60: 380-381.       pdf

Harlow, D. L. and P. H. Bloom. 1989. Buteos and the Golden Eagle. Proceedings of the Western Raptor Management Symposium and Workshop, 26-28 October 1987, Boise, Idaho. National Wildlife Federation Scientific and Technical Series 12:102-110.

Risebrough, R.W., R.W. Schlorff, P.H. Bloom, and E.E. Littrell. 1989. Investigations of the decline of Swainson's Hawk populations in California. Journal of Raptor Research 23:63-71.

Bloom, P. H. 1988. [Arrivederci, condor]. Uccelli 23:8-11. (In Italian)

Wiemeyer, S.N., J.M. Scott, M.P. Anderson, P.H. Bloom, and C.J. Stafford. 1988. Environment contaminants in California Condors. Journal of Wildlife Management 52:238-247.

Bloom, P. H. 1987. Capturing and handling raptors. Pp. 99-123 in: B.G. Pendleton, B.A. Millsap, K.W. Cline, and D.M. Bird (eds.), Raptor management techniques manual. National Wildlife Federation, Washington, D.C.

Bloom, P. H. 1985. Raptor movements in California. Pp. 313-323 in: Harwood, M. (ed.), Proceedings of Hawk Migration Conference IV. Hawk Migration Association of North America, Rochester, NY.

Bloom, P. H., S. J. Hawks, M. D. McCrary, and B. J. Walton. 1987. (Abstract) Movements of raptors in California: an update. P. 3 in Program of the Western Raptor Migration Symposium.

Bloom, P. H., S. J. Hawks, S. W. Jankes, R. W. Risebrough, and B. Woodbridge. 1985. (Abstract) The status of the Swainson's Hawk (Buteo swainsoni) in California outside the central valley. Raptor Research Foundation Symposium on the Management of Birds of Prey: International Meeting, Abstracts of papers, 2.

Bloom, P. H., S. B. Kimple, G. D. Sanders, L. Riopeele, and M. P. Wallace. 1985. (Abstract) The pit trap: its effectiveness on cathartid vultures and eagles. Raptor Research Foundation Symposium on the Management of Birds of Prey: International Meeting, Abstracts of papers, 2.

McCrary, M. D. and P. H. Bloom. 1984. Lethal effects of introduced grasses on Red-shouldered Hawks. Journal of Wildlife Management 48: 1005-1008.

Bloom, P.H. G.R. Stewart, and B.J. Walton. 1985. Status of the Northern Goshawk in California, 1981-1983. California Department of Fish and Game Wildlife Management Branch Administrative Report 85-1:1-29.       pdf

McCrary, M. D. and P. H. Bloom. 1984. Observations on female promiscuity in the Red-shouldered Hawk. Condor 86: 486.       pdf

Bloom, P.H. 1983. Notes on the distribution and biology of the Flammulated Owl in California. Western Birds 14:49-52.       pdf

Bloom, P. H. and S. J. Hawks. 1983. Nest box use and reprductive biology of the American Kestrel in Lassen County, California. Raptor Research 17: 9-14.       pdf

Schlorff, R.W., and P.H. Bloom. 1983. Importance of riparian systems to nesting Swainson's Hawks in the Central Valley of California. Pp. 612-618 in R.E. Warner and K.M. Hendrix (eds.), California riparian systems. University of California, Berkeley, CA.

Barrows, C.W., P.H. Bloom, and C.T. Collins. 1982. Sexual differences in the tail barring of Spotted Owls. North American Bird Bander 7:138-139.       pdf

Bloom, P.H. and S.J. Hawks. 1982. Food habits of nesting Golden Eagles in north-east California and north-west Nevada. Raptor Research 16: 110-115.       pdf

Bloom, P.H. 1980. The raptorial birds of Camp Pendleton Marine Corps Base, San Diego County, California. Unpublished report to Camp Pendleton Marine Corps Base, Natural Resources Office. 33 pp.

Collins, C. T. and P. H. Bloom. 1975. Aid to eagle banders. Western Bird Bander 50.

Bloom, P. 1974. Some precautions to be used in banding studies of nesting raptors. Western Bird Bander 49: 4-5.

Bloom, P. H. 1973. Seasonal variation in body weight of Sparrow Hawks in California. Western Bird Bander 48: 17-20.

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