Image Image Image Image Image


Oikonos investigates conservation issues related to terrestrial and oceanic ecosystems, threatened species, and stressors on native wildlife. With over 60 peer-reviewed publications and numerous reports, the Oikonos Nest works to answer critical questions to protect and restore imperiled ecosystems.

Año Nuevo Island, California: Oikonos manages the seabird data time-series from this unique research station.


Annual Report

Read about Oikonos’ accomplishments. Together with you and all our partners, we are making meaningful progress towards protecting and restoring imperiled ecosystems.

English | Spanish

Peer-reviewed Publications

2020 – 2021:

Orben, R.A., Adams, J., Hester, M., Shaffer, S.A., Suryan, R., Deguchi, T., Ozaki, K., Sato, F., Young, L.C., Clatterbuck, C., Conners, M.G., Kroodsma, D.A., Torress, L.G. 2021. Journal of Applied Ecology.

Global political responsibility for the conservation of albatrosses and large petrels.

Beal, M., Dias, M. P., Phillips, R.A., Oppel, S., Hazin, C., Pearmain, E.J., Adams, et al. 2021. Science Advances 7(10): eabd7225.

Assessment of plastic ingestion by pole-caught pelagic predatory fish from O’ahu, Hawaii.

Hyrenbach, D.K., McGinnis, Z. Page, K., Rapp, D., Horgan, D.F., Lynch, J. 2020. Aquatic Conservation Marine and Freshwater Ecosystems (2020): 1-12.

Inter-annual variability in forage fish population size structure: Comparison of selectivity of traditional vs. non-traditional sampling devices.

Thayer, J.A., Burr, Z., Field, J.C., Carle, R.D., Warzybok, P. 2020. Fisheries Research 234 (2021): 105801.

Seasonal variation of Pacific Northern Fulmar bycatch: Implications for age and sex-specific mortality.

Beck, J., Michael, P., Hester, M., Nevins, H., Donnelly-Greenan, E., Gibble, C., Phillips, E., Young, C., Fitzgerald, S. 2020. Fisheries Oceanography (2020): 1-11. DOI: 10.1111/fog.12518.

Geolocator tagging link distributions in the non-breeding season to population genetic structure in a sentinel North Pacific seabird.

Hipfner, M., Prill, M., Studholme, K., Domalik, A., Tucker, S., Jardine, C., Maftei, M., Wright, K., Beck, J., Bradley, R., Carle, R., Good, T., Hatch, S., Hodum, P., Ito, M., Pearson, S., Rojek, N., Slater, L., Watanuki, Y., Will, A., Bindoff, A., Crossin, G., Drever, M., Burg, M. 2020. PLoS One: 1-28. DOI:

Genetic analysis of the diet of red-footed boobies (Sula sula) provisioning chicks at Ulupa’u Crater, Oahu.

Donahue, S., Adams, J., Renshaw, M., Hyrenbach, D. 2020. Aquatic Conservation: Marine and Freshwater Ecosystems (2020): 1-16. DOI:

Alien Mammal Assemblage Effects on Burrow Occupancy and Hatching Success of the Vulnerable Pink-Footed Shearwater in Chile

García-Díaz, P. Hodum, P., Colodro, V., Hester, Carle, R. 2020. Environmental Conservation: 1-9.

Assessing light pollution impacts on seabirds in Chile: Diagnosis and Proposal

Silva., R, Tejeda, I., Medrano, F., Teran, D. 2020. Neotropical Ornithology 31: 13-24.

Cassin’s Auklet (Ptychoramphus aleuticus) Population Size, Reproduction, and Habitat Management on a Recently Colonized Island in California, USA.

Carle, R., Hester, M., Colletta, E., Beck, J. 2020. Waterbirds 42(4): 366-379.

Direct In Vivo Evidence for Accumulation of Plastic Derived Chemicals in Seabird Tissue.

Tanaka, Kosuke and Watanuki, Yutaka and takada, Hideshige and Ishizuka, Mayumi and Yamashita, Rei and Kazama, Mami and Hiki, Nagako and Mizukawa, Kaoruko and Mizukawa, Hazuki and Hyrenbach, David and Hester, Michelle and Ikenaka, Yoshinori and Nakayama, Shouta M. M., 2019. Direct In Vivo Evidence for Accumulation of Plastic Derived Chemicals in Seabird Tissue. Current Biology 30: 1-6. 



Vokhshoori, N., McCarthy M.D., Collins, P.W., Etneir, M.A., Torben, R., Eda, M., Beck, J., Newsome, S.D. 2019. Marine Ecology Press Series 610: 1-13. doi:

Holmes, N., Spatz, D., Oppel, S., et al. 2019. PLoS ONE 14(3): e0212128.

Morra, K.E., Chikaraishi, Y., Gandhi, H., James, H.F., Rossman, S., Wiley, A.E., Raine, A.F., Beck, J., and Ostrom, P.H. 2019. Oecologia, 189: 395–406.

Rodriguez, A., Arcos, J., Bretagnolle, V., Dias, M., Holmes, N., Louzao, M., Provencher, J., Raine, A., Ramirez, F., Rodriguez, B., Ronconi, R., Taylor, R., Bonnaud, E., Borrelle, S., Cortes, V., Descamps, S., Friesen, V., Genovart, M., Hedd, A., Hodum, P., Humphries, G., Corre, M., Lebarbenchon, C., Martin, R., Melvin, E., Montevecchi, W., Pinet, P., Pollet, I., Ramos, R., Russell, J., Ryan, P., Sanz-Aguilar, A., Spatz, D., Travers, M., Votier, S., Wanless, R., Woehler, E., Chiaradia, A. 2019. Frontiers in Marine Science 6(94)doi: 10.3389/fmars.2019.00094

Felis, J., Adams, J., Hodum, P., González, A., Carle, R., Colodro, V. 2019. Endangered Species Research 39: 269-282.

Carle, R., Felis, J., Vega, R., Beck, J., Adams, J., Lopez, V., Hodum, P., González, A., Colodro, V., Varela, T. 2019. The Condor.

Gutiérrez-Guzmán, H., Ziller, S.R., and M. de S. Dechoum. 2019. Conservation Evidence 16: 27-32.

Vokhshoori, N.L., M.D. McCarthy, P.W. Collins, M.A. Etnier, T. Rick, M. Eda, J. Beck, and S.D. Newsome.  2019. Marine Ecological Progress Series 610: 1-13.

Morra, K.C., Chikaraishi, Y., Gandhi, H., James, H.F., Rossman, S., Wiley, A.E., Raine, A.F., Beck, J., & P.H. Ostrom. 2019. Oecologia 189: 395-406.

Adams, J., Felis, J.J., Czapanskiy, M., Carle, R.D., & Hodum, P.J. 2019. Marine Ornithology 47: 17-24


Nevins, H.M., Beck, J., Michael, P.E., Hester, M., Peschon, J., Donnelly-Greenan, E., & Fitzgerald, S. 2018. Marine Ornithology, 46: 187–196.

Youngren, S.M., Rapp, D.C., Hyrenbach, K.D. 2018. Marine Pollution Bulletin, 128: 369–378. doi:10.1016/j.marpolbul.2018.01.053

Warzybok, P., Santora, J.A., Ainley, D.G., Bradley, R.W., Field, J.C., Capitolo, P.J., Carle, R.D., Elliot, M., Beck, J.N., McChesney, G.J., Hester, M.M., Jahncke, J. 2018. Journal of Marine Systems, 185: 25–39. doi:10.1016/j.jmarsys.2018.04.009

Donnelly-Greenan, E., Hyrenbach, D., Beck, J., Fitzgerald, S., Nevins, H., & Hester, M. 2018. Marine Ornithology, 46: 79–84.

Gibble, C., Duerr, R., Bodenstein, B., Lindquist, K., Lindsey, J., Beck, J., Henkel, L., Roletto, J., Harvey, J., Kudela, R. 2018. Journal of Wildlife Diseases, 54(3) doi:10.7589/2017-07-179

Ainely, D.G., Santora, J.A., Capitolo, P.J., Field, J.C., Beck, J.N., Carle, R.D., Donnelly-Greenan, E., McChesney, G.J., Elliot, M., Bradley, R.W., Lindquist, K., nelson, P., Roletto. J., Warzybok, P., Hester, M., Jahncke, J. 2018. Biological Conservation, 217: 407-418.

Sáez, F., San Martín, V.L., Meza, J., Leiva, I., France, A., Barra, L., Baeriswy, F., Silva, C., Hodum, P., & Edgington, S. 2017. Biodiversidata, 5

Reyes-Cabrera, G., Colodro, V., Herrera, J., Astete, F., Varela, T., Millalén, B., Gajardo, A., López, V., & Hodum, P. 2017. Biodiversidata, 5

Hyrenbach, K.D., Hester, M.M., Adams, J., Titmus, A.J., Michael, P., Wahl, T., Chang, C., Marie, A., Vanderlip, C. 2017. Marine Ornithology, 45: 225-236.

Rapp, D.C, Youngren, S.M., Hartzell, P., Hyrenbach, K.D. 2017. Marine Pollution Bulletin, 123: 269-278. doi:10.1016/j.marpolbul.2017.08.047

Rodríguez, A., Holmes, N. D., Ryan, P. G., Wilson, K.-J., Faulquier, L., Murillo, Y., Raine, A. F., Penniman, J. F., Neves, V., Rodríguez, B., Negro, J. J., Chiaradia, A., Dann, P., Anderson, T., Metzger, B., Shirai, M., Deppe, L., Wheeler, J., Hodum, P., Gouveia, C., Carmo, V., Carreira, G. P., Delgado-Alburqueque, L., Guerra-Correa, C., Couzi, F.-X., Travers, M. and Corre, M. L. 2017. Conservation Biology 31: 986–1001. doi:10.1111/cobi.12900

Carle, R.D., Calleri, D.M., Beck, J.N., Halbert, P. & Hester, M.M. 2017. Marine Ornithology 45: 149-157.

Patton, R.T., Goodenough, K.S., De La Cruz, S.E.W., Nevins, H., Cole, R., Bodenstein, B., Shearn-Bochsler, V., Collins, B., Beck, J., Sadowski, M., Takekawa, J.Y. 2017. Journal of Wildlife Diseases 53(4) DOI: 10.7589/2016-11-258

Vizentin-Bugoni, J., Sonne, J., Hodum, P., Hagen, E. and Cordeiro, J. 2017. Journal of Ornithology DOI 10.1007/s10336-017-1431-1


Carle R., Beck J., Colodro V., and Hodum P. 2016. Revista Chilena de Ornitología 22 (2): 184-193.

Carle R., Beck J., Calleri D., and Hester M. 2015. Journal of Marine Systems 146:99-108.


Overlap of North Pacific Albatrosses with the U.S. West Coast Groundfish and Shrimp Fisheries

Guy T., Jennings S., Suryan R., Melvin E., Bellman M., Balance L., Blackie B., Croll D., Deguchi T., Geernaert T., Henry R., Hester M., Hyrenbach D., Jahncke J., Kappesf M., Ozaki K., Roletto J., Sato F., Sydeman W., Zamon J. 2013. Fisheries Research (147):222-234.

 Ambassadors: Ocean Literacy Through the Eyes of Albatross

Marrero M., Hester M., Hyrenbach D., Michael P., Adams J., Keiper C., Stock J., Collins A., Vanderlip C., Alvarez T., Webb S. 2013. Current: The Journal of Marine Education 28(2):26-30.

First Evidence of Plastic Ingestion by White-Tailed Tropicbirds from O’ahu, Hawai’i

Hyrenbach D., Hester M., Johnson J., Lyday S., Bingham S., Pawloski J. 2013. Marine Ornithology(41):167–169.


Nest site use in sympatric petrels of the Juan Fernández Archipelago, Chile: Juan Fernández petrel (Pterodroma externa) and Stejneger’s petrel (Pterodroma longirostris)

Reyes, R., P.J. Hodum and R.P. Schlatter. 2012. Ornitología Neotropical 23 (1), 73–82.

The Nest Predator Assemblage for Songbirds in Mono Lake Basin Riparian Habitats

Latif Q., Heath S., Ballard G. 2012. Western North American Naturalist (72):276.

Effects of Parents and Brown-Headed Cowbirds (Molothrusater) on Nest Predation Risk for a Songbird

Latif Q., Heath S., Rotenberry J. 2012. Ecology and Evolution 2(12):3079–3097.

Seabird Islands Ecology Invasion Restoration

Social Dimension - Public Involvement in Seabird Island Restoration

Jones H.P., Aguirre-Munoz A., Kress S.W., Hodum P.J., Burbidge A.A., Saunders A. 2011. In Seabird Islands: Ecology, Invasion, and Restoration. Oxford University Press. ISBN 978-0-19-973569-3.

Albatross and Giant-Petrel Distribution Across the World’s Tuna and Swordfish Fisheries

Alderman R., Anderson D., Arata J., Catry P., Cuthbert R., Deppe L., Elliot G., Gales R., Gonzales J., Granadeiro1 J., Hester M., Huin N., Hyrenbach D., Layton K., Nicholls D., Ozak K., Peterson S., Phillips R., Quintana F., Balogh G., Robertson C., Robertson G., Sagar P., Sato F., Shaffer S., Small C., Stahl J., Suryan R., Taylor P., Thompson D., Walker K., Wanless R., Waugh S., Weimerskirch H. 2011. The Third Joint Tuna RFMOs Meeting; La Jolla.

The Ecotoxicology of Marine Debris

Brander S., Fontana R., Mata T., Gravem S., Hettinger A., Bean J., Szoboszlai A., Keiper C., Marrero M. 2011. The American Biology Teacher 73(8):474-478.

The Rakiura Tītī Islands Restoration Project: Community Action to Eradicate Rattus rattus and Rattus exulans for Ecological Restoration and Cultural Wellbeing

McClelland J., Coote R., Trow M., Hutchins P., Nevins H., Adams J., Newman J., Moller H. 2011. In Island Invasives:Eradication and Management. IUCN, Gland, Switzerland. Pages 451-454


Ainley D., Hyrenbach D. 2010. Progress in Oceanography 84(3-4):242-254.

Hagen E., Bakker J., Gara R. 2010. Environmental Entomology 39(4):1159-1164.

Tomasevic J., HodumCP., EstadeS C. 2010. Ornithologia Neotropical 21(4):535-543.

Phillips E., Nevins H., Hatch S., Ramey A., Miller M., Harvey J. 2010. Marine Ornithology (38):111–117.

Latif Q. 2009. UC Riverside Electronic Theses and Dissertations.

Nevins H., Adams J., Moller H., Newman J., Hester M., Hyrenbach D. 2009. Journal of the Royal Society of New Zealand 39(4):183–185; 1175-8899(Online); 0303-6758 (Print)/09/3904–0183.

Hyrenbach D., Nevins H., Hester M., Keiper C., Webb S., Harvey J. 2009. Marine Debris in Alaska: Coordinating our Efforts. pp.57-61.


Hyrenbach D., Keiper C., Allen S., Anderson D., Ainley D. 2006. Fisheries Oceanography 15(2):95-103.

Karnovsky N., Spear L., Carter H., Ainley D., Amey K., Ballance L., Briggs K., Ford R., Hunt G., Keiper C., Mason J., Morgan K., Pitman R., Tynan C. 2006. Marine Ornithology 33:89–104.

Hyrenbach D. 2008. In: De Roi, T., Jones, M., Fitter, J. (Eds). Albatross: their world, their ways. Firefly Books, Buffalo, NY. Pp. 118-120.

Nevins H., Keiper C., Hyrenbach D., Stock J., Hester M., Harvey J. 2005. Rivers to Sea Conference Proceedings

Keiper C., Ainley D., Allen S., Harvey J. 2005. Marine Ecology Progress Series (289):285–306.

Spear L., Ainley D., Webb S. 2005. Ornithological Society of New Zealand Notornis:88–105.

Hester M., Allen S., Adams D., Nevins H. 2005. Point Reyes National Seashore.

Ford R., Ainley D., Casey J., Keiper C., Spear L., Ballance L. 2004. Marine Ornithology (32):77-96.

Spear L., Ainley D., Hardesty B., Howell S., Webb S. 2004. Marine Ornithology (32):147–157.

Photo by Denny Henry
Our plastic trash found in the stomach of one albatross chick: Oikonos tracks the amount of marine debris eaten by top ocean predators such as seabirds and tunas.