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<p class=MsoNormal><span style='font-size:11.0pt'>HYRENBACH, K.D., HENRY, M.F.,
MORGAN, K.H., WELCH, D.W. &amp; SYDEMAN, W.J. 2007. Optimizing the width of
strip transects for seabird surveys from vessels of opportunity. <i>Marine
Ornithology</i></span><span style='font-size:11.0pt'> 35: 29-37.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt'><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt'>We present a study to
determine the most appropriate strip width for conducting at-sea surveys of marine
bird populations from novel platforms of opportunity.<span style="mso-spacerun:
yes">&nbsp; </span>We surveyed seabirds during two seasonal (summer, fall) cruises
across the North Pacific in 2002.<span style="mso-spacerun: yes">&nbsp;
</span>We used these observations to quantify potential biases associated with varying
the survey strip width.<span style="mso-spacerun: yes">&nbsp; </span>More
specifically, we compared the proportion of the sighted birds that were
identified to species level, and the observed and expected apparent densities
(number km<sup>-2</sup>) of different taxa from 100m, 200m, and 400m strip
transects.<span style="mso-spacerun: yes">&nbsp; </span>We also examined the
effects of weather (Beaufort sea state, cloud cover) and bird behavior (sitting
versus flying) on species-specific identification rates and density estimates.<span
style="mso-spacerun: yes">&nbsp; </span>While different taxa showed distinct
detection curves, we conducted a community-level analysis to determine the most
effective strip transect for surveying the entire avifauna.<span
style="mso-spacerun: yes">&nbsp; </span>Based on these results, we determined
that a 400m strip width was most appropriate for our large and high-speed survey
platform, the bulk-cargo carrier <i>Skaubryn</i></span><span style='font-size:
11.0pt'>.<span style="mso-spacerun: yes">&nbsp; </span>We offer some
suggestions to select the most suitable strip width for seabird surveys from
vessels of opportunity.<span style="mso-spacerun: yes">&nbsp; </span>We urge
marine ornithologists using novel survey platforms to test the underlying
assumptions of at-sea survey techniques and to determine the methods best
suited for their specific survey conditions.<o:p></o:p></span></p>

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<p class=MsoNormal style='margin-left:.5in;text-indent:-.5in'><span
style='font-size:11.0pt'>Key words:<span style="mso-spacerun: yes">&nbsp;
</span>at-sea surveys, distance sampling methods, platforms of opportunity,
population surveys, seabirds, strip transects, survey biases, survey methods<i><o:p></o:p></i></span></p>

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