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Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California

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  • معلومة اضافية
    • Subject Terms:
    • Author-Supplied Keywords:
      Butterfly
      Citizen-science
      Diversity
      Fisher’s alpha
      Life history
      Monitoring
    • NAICS/Industry Codes:
      541910 Marketing Research and Public Opinion Polling
    • Abstract:
      Abstract: The butterfly fauna at Willow Slough, Yolo County, California has been censused for 32years as part of a participatory citizen-science project, the Fourth of July Butterfly Count. While the utility of a once-a-year census as a monitoring tool is potentially compromised by lack of standardization in counting protocols and variation in observer skill, at Willow Slough these issues have been minimized. We examined the Willow Slough count data for trends in both faunal diversity and the probability of presence of individual species. During the study, the number of species observed at a visit declined by 39%. Regressions of per-visit species counts against time did not detect a statistically significant decline until year 24. In contrast, Fisher’s α, a statistic designed to reduce sample-size bias, detected the decline as early as year 13. Twelve of the 24 species analyzed showed significant declines in probability of occurrence; a further nine exhibited negative but non-significant trends. Butterflies that overwinter as eggs or larvae were more likely to decline than those that overwinter as pupae or adults. Many species in decline at Willow Slough have also been observed less frequently at nearby sites which are monitored year-round, supporting the value of once-a-year monitoring. Although correlations with climatic data have been identified, they are too weak to account for the observed faunal decline. We suspect broader patterns of land use and habitat continuity are implicated in butterfly declines across the region. We conclude that once-a-year sampling, if properly and rigorously done, is in fact useful as a monitoring tool for butterfly faunas, and that Fisher’s α is well suited to early detection of trends in repeated diversity sampling. [Copyright &y& Elsevier]
    • Abstract:
      Copyright of Biological Conservation is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
    • Author Affiliations:
      1Department of Environmental Science and Policy, University of California, Davis, 1 Shields Ave., Davis, CA 95616, USA
      2Department of Ecology and Evolutionary Biology, University of Arizona, Tuscon, AZ 85721, USA
      3Center for Population Biology, University of California, Davis, CA 95616, USA
    • ISSN:
      0006-3207
    • Accession Number:
      10.1016/j.biocon.2011.04.023
    • Accession Number:
      61176650
  • Citations
    • ABNT:
      O, B. J. M. et al. Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California. Biological Conservation, [s. l.], v. 144, n. 7, p. 2012–2019, 2011. DOI 10.1016/j.biocon.2011.04.023. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=61176650&custid=s8280428. Acesso em: 15 jul. 2020.
    • AMA:
      O BJM, Thorne JH, Rosenzweig ML, Shapiro AM. Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California. Biological Conservation. 2011;144(7):2012-2019. doi:10.1016/j.biocon.2011.04.023.
    • AMA11:
      O BJM, Thorne JH, Rosenzweig ML, Shapiro AM. Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California. Biological Conservation. 2011;144(7):2012-2019. doi:10.1016/j.biocon.2011.04.023
    • APA:
      O, B. J. M., Thorne, J. H., Rosenzweig, M. L., & Shapiro, A. M. (2011). Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California. Biological Conservation, 144(7), 2012–2019. https://doi.org/10.1016/j.biocon.2011.04.023
    • Chicago/Turabian: Author-Date:
      O, Brien, Joshua M., James H. Thorne, Michael L. Rosenzweig, and Arthur M. Shapiro. 2011. “Once-Yearly Sampling for the Detection of Trends in Biodiversity: The Case of Willow Slough, California.” Biological Conservation 144 (7): 2012–19. doi:10.1016/j.biocon.2011.04.023.
    • Harvard:
      O, B. J. M. et al. (2011) ‘Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California’, Biological Conservation, 144(7), pp. 2012–2019. doi: 10.1016/j.biocon.2011.04.023.
    • Harvard: Australian:
      O, BJM, Thorne, JH, Rosenzweig, ML & Shapiro, AM 2011, ‘Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California’, Biological Conservation, vol. 144, no. 7, pp. 2012–2019, viewed 15 July 2020, .
    • MLA:
      O, Brien, Joshua M., et al. “Once-Yearly Sampling for the Detection of Trends in Biodiversity: The Case of Willow Slough, California.” Biological Conservation, vol. 144, no. 7, July 2011, pp. 2012–2019. EBSCOhost, doi:10.1016/j.biocon.2011.04.023.
    • Chicago/Turabian: Humanities:
      O, Brien, Joshua M., James H. Thorne, Michael L. Rosenzweig, and Arthur M. Shapiro. “Once-Yearly Sampling for the Detection of Trends in Biodiversity: The Case of Willow Slough, California.” Biological Conservation 144, no. 7 (July 2011): 2012–19. doi:10.1016/j.biocon.2011.04.023.
    • Vancouver/ICMJE:
      O BJM, Thorne JH, Rosenzweig ML, Shapiro AM. Once-yearly sampling for the detection of trends in biodiversity: The case of Willow Slough, California. Biological Conservation [Internet]. 2011 Jul [cited 2020 Jul 15];144(7):2012–9. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=61176650&custid=s8280428