<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Aptos;
panose-1:0 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:12.0pt;
font-family:"Aptos",serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#467886;
text-decoration:underline;}
span.E-mailStijl20
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=NL link="#467886" vlink="#96607D" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Hi Wout,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>The IUCN red list frame work consists of many papers and guidelines. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>In the attached mapping standards 1.16 (2018) the IUCN explicitly states in 7.2 (pages 21 and 22) that you should use 2x2 km squares for the AOO.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Also in the 2024 IUCN Red List Guidelines this is stated in 4.10 (page 54). <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Cheers,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Wouter<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Van:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Syrphidae <syrphidae-bounces@lists.nottingham.ac.uk> <b>Namens </b>Francis Gilbert<br><b>Verzonden:</b> vrijdag 6 november 2026 12:54<br><b>Aan:</b> wout.opdekamp@gmail.com; Syrphidae@lists.nottingham.ac.uk<br><b>Onderwerp:</b> Re: [Syrphidae] IUCN Red list Hoverflies: calculation AOO<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB 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 lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB 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 lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'>Francis<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial",sans-serif'>Dr Francis Gilbert<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB 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 lang=EN-GB 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 lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm;font-size:pt'><p class=MsoNormal><b><span lang=EN-GB style='font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-GB style='font-family:"Calibri",sans-serif'> Syrphidae <<a href="mailto:syrphidae-bounces@lists.nottingham.ac.uk">syrphidae-bounces@lists.nottingham.ac.uk</a>> <b>On Behalf Of </b><a href="mailto:wout.opdekamp@gmail.com">wout.opdekamp@gmail.com</a><br><b>Sent:</b> 06 November 2026 10:59<br><b>To:</b> <a href="mailto:Syrphidae@lists.nottingham.ac.uk">Syrphidae@lists.nottingham.ac.uk</a><br><b>Subject:</b> [Syrphidae] IUCN Red list Hoverflies: calculation AOO<o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Hi,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>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></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>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></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Could anyone clarify this?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Wout<o:p></o:p></span></p></div></body></html>