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Use of social attraction to restore Ashy Storm-Petrels Oceanodroma homochroa at Orizaba Rock, Santa Cruz Island, California



1US Fish and Wildlife Service, Arcata Fish and Wildlife Office, 1655 Heindon Road, Arcata, CA 95521, USA (bill_mciver@fws.gov)
2Carter Biological Consulting, 1015 Hampshire Road, Victoria, BC V8S 4S8, Canada
3Montrose Settlements Restoration Program, National Park Service, Channel Islands National Park, 1901 Spinnaker Drive, Ventura, CA 93001, USA
4Environment International, Ltd., 233 NE 60th Avenue, Portland, OR 97213, USA
5Humboldt State University, Department of Wildlife, 1 Harpst Street, Arcata, CA 95521, USA
6Current address: Sutil Conservation Ecology, 1622 P Street, Eureka, CA 95501, USA

Received 14 July 2015, accepted 17 February 2016

Date Published: 2016/04/15
Date Online: 2017/02/28

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Appendix 1
Appendix 2


McIVER, W.R, CARTER, H.R., HARVEY, A.L., MAZURKIEWICZ, D.M. & MASON, J.W. 2016. Use of social attraction to restore Ashy Storm-Petrels Oceanodroma homochroa at Orizaba Rock, Santa Cruz Island, California. Marine Ornithology 44: 99-112.

Key words: artificial nest sites, Ashy Storm-Petrel, Cave of the Birds' Eggs, Oceanodroma homochroa, Orizaba Rock, restoration, Santa Cruz Island, social attraction, vocalization broadcasting


In 2008-2011, social attraction (i.e. provision of artificial nests and nocturnal vocalization broadcasting) was used to restore a small colony of Ashy Storm-Petrels Oceanodroma homochroa at Orizaba Rock off Santa Cruz Island, California, United States. This colony had declined 74.1% from 27 nests (1996) to 7 (2005), or -17.5% per year (1995-2004) using a colony size index. In contrast, a nearby reference colony, Cave of the Birds' Eggs, increased 72.7% from 11 (1995) to 19 nests (2005) but colony size index trend (1995-2004) was non-significant. With social attraction, number of nests at Orizaba Rock almost tripled from the baseline mean of 12 (2005-2007) to 33 (2011), reflecting increases of 22.4% per year using the colony size index (2005-2011) or 26.5% per year based on colony size (2005-2011). In 2008, four eggs were laid in artificial nests; by 2011, petrels laid eggs at 11 of 30 (36.7%) artificial nests and visited nine more (30.0%). In comparison, reference colony size increased from the baseline mean of 22 nests (2005-2007) to 24 nests (2011) or 9.3% per year using the colony size index (1995-2011). Relatively high breeding success at both colonies in 2005-2011 apparently reflected reduced organochlorine pollutants, adequate prey resources, relatively low avian predation, and low or no impacts from squid-fishing lights. In 2010, Common Ravens Corvus corax discovered and dismantled 12 artificial nests; modifications were made in 2011 to prevent raven access. Social attraction resulted in restoration of the Orizaba Rock colony to its 1996 size, demonstrating the technique's effectiveness in increasing colony size and encouraging storm-petrel use of artificial sites.


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