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Richard (Rick) Gerhardt
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Richard (Rick) Gerhardt

   Biography


Sage Science, Inc.
319 SE Woodside Ct.  
Madras,  Oregon  97741  United States
Phone: 541-475-4330
Email: tramperorico@hotmail.com


   Research Interests

Natural history and ecology of owls, kites, falcons, hawks and eagles, especially in the Neotropics.

Migration of raptors.


Species of Interest: 
  • Strix albitarsus
  • Strix huhula
  • Strix occidentalis
  • Strix nebulosa
  • Strix ciccaba
  • Strix virgata
  • Strix nigrolineata
  • Buteogallus urubitinga
  • Elanoides forficatus


   Publications

Hull, J.M., J.J. Keane, W.K. Savage, S.A. Godwin, J.A. Shafer, E.P. Jepsen,E.P., R. Gerhardt, C. Stermer, and H.B. Ernest. 2010. Range-wide genetic differentiation among North American Great Gray Owls (Strix nebulosa) reveals a distinct linege restricted to the Sierra Nevada, California. Molecular Phylogenetics and Evolution 56:212-221.

Anthony, R.G., E.D. Forsman, A.B. Franklin, D.R. Anderson, K.P. Burnham, G.C. White, C.J. Schwarz, J.E. Nichols, G.S. Olson, S.H. Ackers, L.S. Andrews, B.L. Biswell, P.C. Carlson, L.V. Diller, K.M. Dugger, K.E. Fehring, T.L. Fleming, R.P. Gerhardt, S.A. Gremel, R.J. Gutiérrez, P.J. Happe, D. Herter J.M. Higley, R.B. Horn, L.L. Irwin, P.J. Loschl, J.A. Reid, and S.G. Sovern. 2006. Status and trends in demography in Northern Spotted Owls, 1985-2003. Wildlife Monographs 163:1-48.

Gerhardt, R. P. 2004. Cavity nesting in raptors in Tikal National Park and vicinity, Petén, Guatemala. Ornitologia Neotropical 15: 477-483.

Gerhardt, R. P., D. M. Gerhardt, and M. A. Vásquez. 2004. Food delivered to nests of Swallow-tailed Kites in Tikal National Park, Guatemala. Condor 106: 177-181.       pdf

Frey, G.G., and R.P. Gerhardt. 2003. Northern Saw-whet Owl (Aegolius acadicus) migration in the Pacific Northwest. Western North American Naturalist 63:353-357.       pdf

Seavy, N. E., and R. P. Gerhardt. 1998. Breeding biology and nestling diet of the Great Black-hawk. Journal of Raptor Research 32: 175-177.

Gerhardt, R. P., D. M. Gerhardt, and M. A. Vásquez. 1997. Siblicide in Swallow-tailed Kites. Wilson Bulletin 109: 112-120.

Gerhardt, R. P., N. E. Seavy, and M. A. Vasquez. 1997. (Abstract) Ecology of Plumbeous Kites (Ictinia plumbea) and Swallow-tailed Kites (Elanoides forficatus) in northern Guatemala. P. 19 in Rpator Research Foundation 1997 Annual Meeting. Raptor Research Foundation, Savannah, GA.

Gerhardt, R. P., D. M. Gerhardt, C. J. Flatten, and N. B. González. 1994. The food habits of sympatric Ciccaba owls in northern Guatemala. Journal of Field Ornithology 65: 258-264.

Gerhardt, R. P., N. Bonilla G., D. M. Gerhardt, and C. J. Flatten. 1994. Breeding biology and home range of two Ciccaba owls. Wilson Bulletin 106: 629-639.

Gerhardt, R. P., D. M. Gerhardt, N. B. González, and C. J. Flatten. 1993. (Abstract) The food habits, home range and breeding of two sympatric Ciccaba owls. Raptor Research 27: 70.

Gerhardt, R. P. 1993. Food habits of nesting Great Black Hawks in Tikal National Park, Guatemala. Biotropica 25: 349-352.

Gerhardt, R. P., P. M. Harris, and M. A. Vasquez-Marroquin. 1992. (Abstract) Observations and food habits of nesting Black Hawks in Tikal National Park, Guatemala. Journal of Raptor Research 27: 70.

Gerhardt, R. P. 1991. Response of Mottled Owls of broadcast conspecific call. Journal of Field Ornithology 62: 239-244.

Gerhardt, R. P. 1991. Mottled Owls (Ciccaba virgata): response to calls, breeding biology, home range, and food habits. M.Sc. thesis, Boise State University, Boise, ID.

Gerhardt, R. P., and N. Bonilla G. 1991. Nest descriptions, food habits, and home range size of Black-and-white Owls (Ciccaba nigrolineata). Pp. 149-157 in Whitacre, D. F., W. A. Burnham, and J. P. Jenny (eds.), Progress report IV, 1991: Maya Project: use of raptors and other fauna as environmental indicators for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Gerhardt, R. P., N. Bonilla G., and D. M. Gerhardt. 1991. Reproductive biology, food habits, and home range size of Mottled Owl (Ciccaba virgata). Pp. 145-148 in Whitacre, D. F., W. A. Burnham, and J. P. Jenny (eds.), Progress report IV, 1991: Maya Project: use of raptors and other fauna as environmental indicators for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Harris, P. M., R. P. Gerhardt, and M. A. Vásquez M. 1991. Observations on food habits of nesting Great Black Hawk (Buteogallus urubitinga ridgwayi Gurney). Pp. 83-91 in Whitacre, D. F., W. A. Burnham, and J. P. Jenny (eds.), Progress report, 1991: Maya Project: use of raptors and other fauna as environmental indicators for design and management of protected areas and for building lcoal capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Gerhardt, D. M., M . A. Vasquez, and R. P. Gerhardt. 1990. Swallow-tailed Kite (Elanoides forficatus). Pp. 121-128 in W. A. Burnham, D. F. Whitacre, and J. P. Jenny (eds.), Progress report III, 1990: Maya Project: use of raptors as environmental indices for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Gerhardt, R. P., M. A. Vasquez, and D. M. Gerhardt. 1991. Breeding biology, food habits, and siblicide of Swallow-tailed Kites (Elanoides forficatus). Pp. 65-72 in Whitacre, D. F., W. A. Burnham, and J. P. Jenny (eds.), Progress report IV, 1991: Maya Project: use of raptors and other fauna as environmental indicators for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Flatten, C. J., and R. P. Gerhardt. Nest description, home range, and food habits of the Black-and-white Owl (Ciccaba nigrolineata). 1989. Pp. 61-68 in Burnham, W. A., J. P. Jenny, and C. W. Turley (eds.), Progress report II, 1989: Maya Project: use of raptors as environmental indices for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Gerhardt, R. P., and D. M. Gerhardt. 1990. Mottled Owl (Ciccaba virgata). Pp. 109-120 in W. A. Burnham, D. F. Whitacre, and J. P. Jenny (eds.), Progress report III, 1990: Maya Project: use of raptors as environmental indices for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Flatten, C. J., J. A. Madrid M., A. E. Hernández C., and R. P. Gerhardt. 1989. Observations at a nest of an Ornate Hawk-eagle (Spizaetus ornatus). Pp. 69-80 in W. A. Burnham, J. P. Jenny, and C. W. Turley (eds.), Progress report II, 1989: Maya Project: use of raptors as environmental indices for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Gerhardt, R. P. 1989. Response of Mottled Owl (Ciccaba virgata) to broadcast of conspecific call. Pp. 37-44 in Burnham, W. A., J. P. Jenny, and C. W. Turley (eds.), Project report II, 1989: Maya Project: use of raptors as environemental indices for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.

Gerhardt, R. P., and R. K. Thorstrom. 1989. Identification of raptors by voice print analysis. Pp. 45-48 in Burnham, W. A., J. P. Jenny, and C. W. Turley (eds.), Progress report II, 1989: Maya Project: use of raptors as environmental indices for design and management of protected areas and for building local capacity for conservation in Latin America. The Peregrine Fund, Boise, ID.



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