Line Transect Surveys Underdetect Terrestrial Mammals: Implications for the Sustainability of Subsistence Hunting Public Deposited

http://ir.library.oregonstate.edu/concern/articles/9z9031635

This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by the Public Library of Science. The published article can be found at:  http://www.plosone.org/

Data Availability Statement: Data not provided includes village names, hunters, and hunting details due to ethical human rights concerns linked to indigenous peoples of the area. Agreements with indigenous people limit data to use by our research group. All other relevant data are within the paper and its Supporting Information files.

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  • Conservation of Neotropical game species must take into account the livelihood and food security needs of local human populations. Hunting management decisions should therefore rely on abundance and distribution data that are as representative as possible of true population sizes and dynamics. We simultaneously applied a commonly used encounter-based method and an infrequently used sign-based method to estimate hunted vertebrate abundance in a 48,000-km² indigenous landscape in southern Guyana. Diurnal direct encounter data collected during three years along 216, four-kilometer -long transects consistently under-detected many diurnal and nocturnal mammal species readily detected through sign. Of 32 species analyzed, 31 were detected by both methods; however, encounters did not detect one and under-detected another 12 of the most heavily hunted species relative to sign, while sign under-detected 12 never or rarely collected species relative to encounters. The six most important game animals in the region, all ungulates, were not encountered at 11–40% of village and control sites or on 29–72% of transects where they were detected by sign. Using the sign methodology, we find that tapirs, one of the terrestrial vertebrates considered most sensitive to overexploitation, are present at many sites where they were never visually detected during distance sampling. We find that this is true for many other species as well. These high rates of under-detection suggest that behavioral changes in hunted populations may affect apparent occurrence and abundance of these populations. Accumulation curves (detection of species on transects) were much steeper for sign for 12 of 16 hunted species than for encounters, but that pattern was reversed for 12 of 16 species unhunted in our area. We conclude that collection of sign data is an efficient and effective method of monitoring hunted vertebrate populations that complements encounter and camera-trapping methods in areas impacted by hunting. Sign surveys may be the most viable method for large-scale, management-oriented studies in remote areas, particularly those focused on community-based wildlife management.
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  • Fragoso, J. M., Levi, T., Oliveira, L. F., Luzar, J. B., Overman, H., Read, J. M., & Silvius, K. M. (2016). Line Transect Surveys Underdetect Terrestrial Mammals: Implications for the Sustainability of Subsistence Hunting. PLoS ONE, 11(4), e0152659. doi:10.1371/journal.pone.0152659
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-06-21T14:42:48Z (GMT) No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) FragosoLineTransectSurveys.PDF: 1592536 bytes, checksum: 09fe7db671f67effc6048f9619e1e8ed (MD5) FragosoLineTransectSurveysS1Table.pdf: 91870 bytes, checksum: 34e8e8eea48a61e0f29cd79c7c947b11 (MD5)
  • description.provenance : Made available in DSpace on 2016-06-21T14:42:48Z (GMT). No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) FragosoLineTransectSurveys.PDF: 1592536 bytes, checksum: 09fe7db671f67effc6048f9619e1e8ed (MD5) FragosoLineTransectSurveysS1Table.pdf: 91870 bytes, checksum: 34e8e8eea48a61e0f29cd79c7c947b11 (MD5) Previous issue date: 2016-04-13
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-06-21T14:42:07Z No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) FragosoLineTransectSurveys.PDF: 1592536 bytes, checksum: 09fe7db671f67effc6048f9619e1e8ed (MD5) FragosoLineTransectSurveysS1Table.pdf: 91870 bytes, checksum: 34e8e8eea48a61e0f29cd79c7c947b11 (MD5)

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