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Electronic Resource

Population Viability Analysis (1992)

Boyce, M S

Palo Alto, Calif. : Annual Reviews

Annual Review of Ecology, Evolution, and Systematics 23 (1992), S. 481-497

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ISSN: 0066-4162

Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff

Topics: Biology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1146/annurev.es.23.110192.002405

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Line transect sampling of Karner blue butterflies ( Lycaeides melissa samuelis) (1998)

Brown, J. A. ; Boyce, M. S.

Springer

Environmental and ecological statistics 5 (1998), S. 81-91

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ISSN: 1573-3009

Keywords: density estimation ; distance sampling ; detection function ; monitoring ; Pollard-Yates

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract Line transect sampling is an effective survey method for estimating butterfly densities because it provides unbiased estimates of site-density (provided key assumptions are met), and estimates are comparable among sites. For monitoring Karner blue butterflies in Wisconsin, USA, comparable estimates are required because each year a different selection of sites will be monitored. Annual state-wide indices of species abundance can be derived from the site-surveys and compared to previous year's indices to monitor trends. We advocate that line transect sampling is preferable to Pollard-Yates transects as a survey technique for monitoring Karner blue butter- flies. The Pollard-Yates surveys do not adjust for diferences in site detectability. As a consequence, estimates of among-site from Pollard-Yates surveys can be biased. © Rapid Science 1998