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<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=FR style='mso-ansi-language:FR'>LAVERS, J.L. &amp; JONES, I.L. 2007. </span>Impacts
of intraspecific kleptoparasitism and diet shifts on Razorbill productivity at
the Gannet Islands, Labrador. <i>Marine Ornithology</i><span style='font-style:
normal'> 35: 1-7.</span></p>

<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></p>

<p class=MsoNormal>Intraspecific kleptoparasitism, the stealing of food from
members of the same species, has received widespread but mostly superficial attention
in the scientific literature.<span style="mso-spacerun: yes">&nbsp;
</span>However, the effects of such behavior can be significant.<span
style="mso-spacerun: yes">&nbsp; </span>Here we report on high rates of
intraspecific kleptoparasitism in the Razorbill (<i>Alca torda</i><span
style='font-style:normal'>) at the Gannet Islands, a behavior which appears to
be<span style='color:black'> colony specific</span>.<span style="mso-spacerun:
yes">&nbsp; </span>Razorbills carry their prey conspicuously in their bill
making them vulnerable to kleptoparasitic attacks from neighboring birds.<span
style="mso-spacerun: yes">&nbsp; </span>We examined the relationship between
the frequency of kleptoparasitic attacks and the prey species carried by
breeding adults.<span style="mso-spacerun: yes">&nbsp; </span>During 2003-2006,
sixty nine percent of all Razorbills carrying food to their chick were attacked
(n = 182) and of these attacks, 18% (n = 22) were successful.<span
style="mso-spacerun: yes">&nbsp; </span>Group attacks (two or more
kleptoparasites) were more successful numerically (<span style='color:black'>27%</span>,
n = 71), however only one member of the group ever received the reward.<span
style="mso-spacerun: yes">&nbsp; </span>The frequency of kleptoparasitism
observed by Razorbills at the Gannet Islands is one of the highest reported for
any seabird including many specialist kleptoparasites such as
frigatebirds.<span style="mso-spacerun: yes">&nbsp; </span>This combined with
the lowest observed Razorbill productivity (overall success = 0.40, n = 222)
for the Gannet Islands and drastic shifts in <span style='color:black'>diet</span>
may indicate decreased food availability.<span style="mso-spacerun: yes">&nbsp;
</span><o:p></o:p></span></p>

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<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph;
mso-layout-grid-align:none;text-autospace:none'>Key words: <i>Alca torda</i><span
style='font-style:normal'>, diet, kleptoparasitism, Razorbill, reproductive
success</span><span style='font-size:10.0pt'><o:p></o:p></span></p>

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