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Annual Marbled Murrelet Abundance and Productivity Surveys Off Central California (Zone 6), 1999-2021 (ver. 4.0, May 2022)

Dates

Publication Date
Start Date
1999
End Date
2021
Revision
2019-03-14
Revision
2020-03-12
Last Revision
2022-05-10

Citation

Felis, J.J., Adams, J., Peery, M.Z., Henry, R.W., Henkel, L.A., Becker, B.H., and Halbert, P., 2022, Annual marbled murrelet abundance and productivity surveys off central California (Zone 6), 1999-2021 (ver. 4.0, May 2022): U.S. Geological Survey data release, https://doi.org/10.5066/F75B01RW.

Summary

Since 2017, U.S. Geological Survey, Western Ecological Research Center (USGS WERC) partnered with California State Parks to continue long-term, annual at-sea surveys to estimate at-sea abundance and juvenile (i.e. hatch-year) productivity of Marbled Murrelets (Brachyramphus marmoratus) in U.S. Fish and Wildlife Service Conservation Zone 6 (central California: San Francisco Bay to Monterey Bay). Marbled Murrelets have been listed as Endangered by the State of California and Threatened by the U.S. Fish and Wildlife Service since 1992. Marbled Murrelets have been surveyed at sea off central California since 1995 (Becker et al. 1997), and standardized surveys to estimate abundance and productivity have been conducted since 1999 (excluding [...]

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Attached Files

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AllSpeciesObs_1999_2021_Final.zip 1.35 MB application/zip
Routes_1999-2021_Final.zip 53.87 KB application/zip
SurveyMetadata1999-2021_Final.zip 17.62 KB application/zip
Tracks_2007-2021_Final.zip 7.94 MB application/zip
2022ScienceBaseRevisions.docx 15.33 KB application/vnd.openxmlformats-officedocument.wordprocessingml.document

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Purpose

The Marbled Murrelet (Brachyramphus marmoratus) is a small, compact wing-propelled, diving seabird of the Family Alcidae. Marbled Murrelets have been listed as Endangered by the State of California and Threatened by the U.S. Fish and Wildlife Service (USFWS) since 1992. Abundance of Marbled Murrelets have been estimated at-sea off central California since 1999 (excluding 2004-2006; Henkel and Peery 2008, Peery et al. 2008, Peery and Henry 2010, Henry et al. 2012, Henry 2017, Henry and Tyler 2017). Information regarding Marbled Murrelet abundance, distribution, population trends, and habitat associations is critical for risk assessment, effective management and evaluation of conservation efficacy, and ultimately to meet federal- and state-mandated recovery efforts for this species in U.S. Fish and Wildlife Service Conservation Zone 6 (central California: San Francisco Bay to Monterey Bay). Standardized at-sea surveys in central California are designed to assess abundance and productivity for two main purposes: (1) to maintain efforts to quantify the status of Marbled Murrelets in central California (USFWS Conservation Zone 6) and (2) to help evaluate potential benefits and Marbled Murrelet response to ongoing corvid control in coastal California State Parks. Additionally, Marbled Murrelet distribution data at-sea will help resource managers designate critical at-sea habitat for the species.

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  • USGS Data Release Products
  • USGS Western Ecological Research Center

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Revision 4.0 by Erika Sanchez-Chopitea on May 10,2022. To review changes that were made, see "2022ScienceBaseRevisions.docx" in the attached files section.

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DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/F75B01RW

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