Subtleties of adaptive colouration in Alcelaphus cokii and Alcelaphus caama

Please see https://www.inaturalist.org/journal/milewski/71135-structure-and-function-of-the-tail-show-that-the-red-hartebeest-alcelaphus-caama-is-a-different-species-from-coke-s-hartebeest-alcelaphus-cokii#.

BLEEZE

The following show that, in Alcelaphus cokii, the bleeze can function even when the animals are lying down:

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COLOURATION OF INFANTS

Alcelaphus caama including infant:

https://www.dreamstime.com/stock-image-baby-red-hartebeest-antelope-image13753251

https://stock.adobe.com/search?k=hartebeest&asset_id=18118174

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Alcelaphus cokii including infant:

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https://stock.adobe.com/search?k=hartebeest&asset_id=348547283

https://www.gettyimages.co.uk/detail/photo/side-view-of-deer-standing-on-grassy-field-royalty-free-image/1353500618?phrase=cokes%20hartebeest&adppopup=true

https://www.gettyimages.co.uk/detail/photo/female-coke-hartebeest-nuzzles-baby-in-savannah-royalty-free-image/1331905621?phrase=cokes%20hartebeest&adppopup=true

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CAUDAL FLAG

The following shows what is presumably routine swishing of the tail, in A. cokii. My interpretation is that this does not qualify as activation of the caudal flag:

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The following shows the activation of the caudal flag during running (including stotting) in infants of Alcelaphus caama:

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ONTOGENETIC DEVELOPMENT

The following shows that, in Alcelaphus caama, the pale part of the bleeze on the hindquarters appears as soon as the horns appear:

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The same seems true for A. cokii:

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However, in A. caama, the darkness of the tail-tassel is present already at birth:

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The following shows that the tail-tassel is not dark at birth in A. cokii:

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The following shows activation of the caudal flag in young juveniles of A. caama:

https://www.alamy.com/young-red-hartebeest-alcelaphus-buselaphus-running-in-grassland-mountain-zebra-national-park-south-africa-image472233605.html?imageid=AB82AC72-0091-4A2F-803B-421A23B37322&p=70019&pn=1&searchId=5a9d18d908b9a4c9c188c881e40a80e9&searchtype=0

BUCCAL SEMET

The following are excellent illustrations of the buccal semet:

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https://www.pond5.com/stock-footage/item/201046473-red-hartebeest-veld

The following show typical situations in which a buccal semet would work:

Alcelaphus cokii:

https://www.alamy.com/stock-photo-family-of-hartebeests-alcelaphus-buselaphus-with-the-calf-resting-76975047.html?imageid=ECF3E342-4610-4AB0-9F78-3855FC382297&p=152806&pn=1&searchId=117090b506a345aef9af2c02d8c3a2c8&searchtype=0

Alcelaphus caama:

https://www.canstockphoto.com/blue-wildebeest-oryx-and-red-hartebeest-85532395.html

https://stock.adobe.com/fi/search?k=%22red+hartebeest%22&asset_id=381575350

https://www.alamy.com/group-of-red-hartebeest-laying-down-in-the-grass-in-the-etosha-national-park-namibia-image333967711.html

The two spp. have a similar buccal semet, despite their many other differences in colouration.

Alcelaphus cokii:

https://www.shutterstock.com/image-photo/closeup-portrait-red-hartebeest-antelope-ngorongoro-61003108

https://www.dreamstime.com/coke-s-hartebeest-kongoni-antelope-native-to-kenya-tanzania-can-breed-lelwel-produce-hybrid-known-as-image243431831

https://www.dreamstime.com/stock-images-closeup-portrait-hartebeest-antelope-image16104934

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https://www.gettyimages.co.uk/detail/photo/side-view-of-deer-standing-on-field-tanzania-royalty-free-image/1408086147?phrase=cokes%20hartebeest&adppopup=true

Alcelaphus caama:

https://stock.adobe.com/fi/search?filters%5Bcontent_type%3Aphoto%5D=1&filters%5Bcontent_type%3Aillustration%5D=1&filters%5Bcontent_type%3Azip_vector%5D=1&filters%5Bcontent_type%3Avideo%5D=1&filters%5Bcontent_type%3Atemplate%5D=1&filters%5Bcontent_type%3A3d%5D=1&filters%5Bcontent_type%3Aaudio%5D=0&filters%5Binclude_stock_enterprise%5D=0&filters%5Bis_editorial%5D=0&filters%5Bfree_collection%5D=0&filters%5Bcontent_type%3Aimage%5D=1&k=%22red+hartebeest%22&order=relevance&safe_search=1&limit=100&search_page=2&get_facets=0&search_type=pagination&asset_id=490956084

https://www.shutterstock.com/image-photo/two-elephants-lying-mud-pool-playing-138906173

https://www.shutterstock.com/image-photo/red-hartebeest-pesky-flies-511415041

https://www.shutterstock.com/image-photo/hartebeest-alcelaphus-buselaphus-namibia-1117000082

https://www.canstockphoto.com/red-hartebeest-antelope-portrait-18839566.html

https://stock.adobe.com/au/search?filters%5Bcontent_type%3Aphoto%5D=1&filters%5Bcontent_type%3Aillustration%5D=1&filters%5Bcontent_type%3Azip_vector%5D=1&filters%5Bcontent_type%3Avideo%5D=1&filters%5Bcontent_type%3Atemplate%5D=1&filters%5Bcontent_type%3A3d%5D=1&filters%5Bcontent_type%3Aaudio%5D=0&filters%5Binclude_stock_enterprise%5D=0&filters%5Bis_editorial%5D=0&filters%5Bfree_collection%5D=0&filters%5Bcontent_type%3Aimage%5D=1&k=%22red+hartebeest%22&order=relevance&safe_search=1&limit=100&search_page=6&search_type=pagination&get_facets=0&asset_id=378788255

https://stock.adobe.com/fi/search?filters%5Bcontent_type%3Aphoto%5D=1&filters%5Bcontent_type%3Aillustration%5D=1&filters%5Bcontent_type%3Azip_vector%5D=1&filters%5Bcontent_type%3Avideo%5D=1&filters%5Bcontent_type%3Atemplate%5D=1&filters%5Bcontent_type%3A3d%5D=1&filters%5Bcontent_type%3Aaudio%5D=0&filters%5Binclude_stock_enterprise%5D=0&filters%5Bis_editorial%5D=0&filters%5Bfree_collection%5D=0&filters%5Bcontent_type%3Aimage%5D=1&k=%22red+hartebeest%22&order=relevance&safe_search=1&limit=100&search_page=3&search_type=pagination&get_facets=0&asset_id=305865941

https://stock.adobe.com/search?filters%5Bcontent_type%3Aphoto%5D=1&filters%5Bcontent_type%3Aillustration%5D=1&filters%5Bcontent_type%3Azip_vector%5D=1&filters%5Bcontent_type%3Avideo%5D=1&filters%5Bcontent_type%3Atemplate%5D=1&filters%5Bcontent_type%3A3d%5D=1&filters%5Bcontent_type%3Aaudio%5D=0&filters%5Binclude_stock_enterprise%5D=0&filters%5Bis_editorial%5D=0&filters%5Bfree_collection%5D=0&filters%5Bcontent_type%3Aimage%5D=1&k=hartebeest&order=relevance&safe_search=1&limit=100&search_page=2&get_facets=0&search_type=pagination&asset_id=196771983

https://stock.adobe.com/search?filters%5Bcontent_type%3Aphoto%5D=1&filters%5Bcontent_type%3Aillustration%5D=1&filters%5Bcontent_type%3Azip_vector%5D=1&filters%5Bcontent_type%3Avideo%5D=1&filters%5Bcontent_type%3Atemplate%5D=1&filters%5Bcontent_type%3A3d%5D=1&filters%5Bcontent_type%3Aaudio%5D=0&filters%5Binclude_stock_enterprise%5D=0&filters%5Bis_editorial%5D=0&filters%5Bfree_collection%5D=0&filters%5Bcontent_type%3Aimage%5D=1&k=hartebeest&order=relevance&safe_search=1&limit=100&search_page=2&get_facets=0&search_type=pagination&asset_id=421086027

In Alcelaphus caama, the buccal semet seems to be present already in infants:
https://www.alamy.com/a-red-hartebeest-alcelaphus-buselaphus-caama-calf-or-small-baby-antelope-running-to-catch-up-image213086330.html?imageid=30037483-EA2C-446D-8B8A-C3C403D598ED&p=698884&pn=1&searchId=a421ab271a4c4a6c2acf5d168f14f775&searchtype=0

Posted on Οκτώβριος 10, 2022 0904 ΜΜ by milewski