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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I have ver 12 (2016) of the guidelines, where it says “in many cases a grid size of 2 km (cell area 4 km²) is an appropriate scale. ... For most cases we recommend a scale of 4-km² cells as the reference
scale” (p.47)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">This is what I have used as a standard for assessing the Egyptian fauna.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Francis<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dr Francis Gilbert<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Emeritus Professor, School of Life Sciences, University of Nottingham, Nottingham NG72RD, UK<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">website:
<a href="https://www-web.nottingham.ac.uk/~plzfg/">https://www-web.nottingham.ac.uk/~plzfg/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif">From:</span></b><span style="font-family:"Calibri",sans-serif"> Syrphidae <syrphidae-bounces@lists.nottingham.ac.uk>
<b>On Behalf Of </b>wout.opdekamp@gmail.com<br>
<b>Sent:</b> 06 November 2026 10:59<br>
<b>To:</b> Syrphidae@lists.nottingham.ac.uk<br>
<b>Subject:</b> [Syrphidae] IUCN Red list Hoverflies: calculation AOO<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I'm trying to find more detailed information on how the Area of Occupancy has been assessed in the IUCN Red List. Unless I misread this information is lacking. In Version 3.1 of the IUCN RED LIST CATEGORIES AND CRITERIA attention is drawn
to the fact that assesment scale impacts the outcome but without giving general guidelines.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">More specifically I would like to know which AOO would be attributed to a species known from for instance 10 fragmented (>5km distance between patches) patches of suitable habitat. Let's say individual patch vary in size but never exceed
5ha.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Could anyone clarify this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Wout<o:p></o:p></p>
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