Previously overlooked expansions of the 'bles' in the blesbok (Damaliscus pygargus phillipsi), signifying full maturity, beyond adulthood

Many photos of the blesbok (Damaliscus pygargus phillipsi) show individuals in which

This spreading of the facial bleeze - which I have not seen mentioned in the literature - may possibly be a sign of age (exceeding ten years). This is indicated by the fact that many of the photos concerned are of captive specimens.

The ultimate result is seen in https://www.inaturalist.org/observations/70027286.

Most of the photos below refer to females, but males also show this pattern (e.g. https://www.inaturalist.org/observations/141372682 and https://www.inaturalist.org/observations/32952125 and https://www.flickr.com/photos/holtphoto/11667853505/in/photolist-iM3Nm2-6TeDse-29Yu8yw-GQHdeu-QzVdjX-e6MgFY-2gjCi6T-H9VkFH-5oDPzj-ASgX6y-H7BJzh-pi4vHm-eYXy2U-5f8mw4-bFbjtX-YaJrFP-pHAQwC-24MnFrZ-71RcCB-csqwjA-3yg1Bw-4GLgxP-6UtPYS-5QZpnc-6DNMdK-37BsTy-dM3YJg-2nbqYFY-275Jw9t-C55EVf-apLdKb-rDKi6z-qtrvU-2nidniQ-o3mr2c-2jjUxYq-2hsDGV3-2hsGrgp-2iGfCyR-HfX4Cz-qtwsg8-ApjDMc-2jfZf6T-zEj283-qpGt6C-bt1qDP-dcWPMW-nQmxok-qFeiSy-2bW3UGB).

We now know of at least three aspects of the colouration of the blesbok that show particular depigmentation, compared to the bontebok (Damaliscus pygargus pygargus), viz.

The pattern on the cheeks, described here, occurs also in the bontebok (https://www.inaturalist.org/observations/27251980). However, it is faint and uncommon in that subspecies.

https://www.dreamstime.com/herd-blesbuck-antelope-standing-dried-out-long-grass-field-landscape-south-african-bushveld-blesbok-antelopes-rocky-dull-image182816487

https://www.dreamstime.com/blesbok-antelope-damaliscus-pygargus-standing-grass-blesbok-antelope-damaliscus-pygargus-standing-grass-pilsen-czech-image181373022

https://www.dreamstime.com/blesbok-lying-grass-blesbok-image265633507

https://www.flickr.com/photos/holtphoto/11667853505/in/photolist-iM3Nm2-6TeDse-29Yu8yw-GQHdeu-QzVdjX-e6MgFY-2gjCi6T-H9VkFH-5oDPzj-ASgX6y-H7BJzh-pi4vHm-eYXy2U-5f8mw4-bFbjtX-YaJrFP-pHAQwC-24MnFrZ-71RcCB-csqwjA-3yg1Bw-4GLgxP-6UtPYS-5QZpnc-6DNMdK-37BsTy-dM3YJg-2nbqYFY-275Jw9t-C55EVf-apLdKb-rDKi6z-qtrvU-2nidniQ-o3mr2c-2jjUxYq-2hsDGV3-2hsGrgp-2iGfCyR-HfX4Cz-qtwsg8-ApjDMc-2jfZf6T-zEj283-qpGt6C-bt1qDP-dcWPMW-nQmxok-qFeiSy-2bW3UGB

https://www.inaturalist.org/observations/128960710

https://www.gettyimages.pt/detail/foto/lonely-african-blesbok-antelope-imagem-royalty-free/93047550?adppopup=true

https://www.inaturalist.org/observations/77675104

https://www.shutterstock.com/it/image-photo/antelope-wild-blesbok-blesbuck-lying-down-2223739221

https://www.superstock.com/asset/blesbok-damaliscus-pygargus-phillipsi-standing-mlilwane-wildlife-sanctuary-swaziland-africa/1566-12911195

https://www.istockphoto.com/photo/blesbuck-in-mlilwane-wildlife-sanctuary-swaziland-gm1182434638-332026999?phrase=blesbok%20male

https://www.shutterstock.com/it/image-photo/blesbok-antelope-damaliscus-pygargus-standing-grass-1329980801

https://www.euro-t-guide.com/See_Photo/Denmark/JUT-M_Grenaa/Ree_Park_Ebeltoft-2008-14.jpg

https://depositphotos.com/635653818/stock-photo-blesbok-blesbuck-damaliscus-pygargus-phillipsi.html

https://www.shutterstock.com/it/image-photo/blesbok-latin-name-damaliskus-dorcas-phillipsi-360070883

https://www.shutterstock.com/it/image-photo/group-blesbuck-mlilwane-wildlife-sanctuary-scenery-1536515885

https://www.shutterstock.com/it/image-photo/blesbok-latin-name-damaliskus-dorcas-phillipsi-290826794

https://www.shutterstock.com/it/image-photo/blesbuck-grazing-on-green-grass-1275827710

https://dewetswild.com/2016/06/23/blesbok/#jp-carousel-52456

https://www.istockphoto.com/photo/blesbuck-in-mlilwane-wildlife-sanctuary-swaziland-gm1182437686-332029264?phrase=blesbok%20male

https://www.inaturalist.org/observations/35368437

https://www.inaturalist.org/observations/124183870

https://www.dreamstime.com/stock-image-blesbok-close-up-antelope-eating-image30613991 and https://www.dreamstime.com/stock-images-blesbok-close-up-antelope-image30613954

Please note the extremely long horns, indicating advanced age, in the central figure in https://www.inaturalist.org/observations/34887688

Also see https://www.inaturalist.org/journal/milewski/75748-adaptive-colouration-in-the-blesbok-damaliscus-pygargus-phillipsi# and https://www.inaturalist.org/posts/78685-the-overlooked-complexity-of-facial-markings-in-genus-damaliscus#.

For an index to my many Posts about the genus Damaliscus, please see https://www.inaturalist.org/journal/milewski/78238-an-index-to-my-posts-on-genus-damaliscus#.

Posted on 01 March, 2023 21:23 by milewski milewski

Comments

The following adult male individual, which is territorial judging from the glandular staining on the facial bleeze, seems to show the beginning of an expansion of pale on the sides of the face:

https://www.inaturalist.org/observations/21052176

Posted by milewski over 1 year ago

The following is possibly the clearest illustration I have ever seen of multi-facetted extension of the facial bleeze in adult males of the blesbok:

https://www.inaturalist.org/observations/175192441

Posted by milewski 12 months ago

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