Testing the idea of a new ancestor (Canis rubronegrus) for the domestic dog: do extant wolves/jackals show traces of black-and-tan colouration? part 2

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...continued from https://www.inaturalist.org/journal/milewski/88861-testing-the-idea-of-a-new-ancestor-canis-rubronegrus-for-the-domestic-dog-do-extant-wolves-jackals-show-traces-of-black-and-tan-colouration-part-1#

DISCUSSION

This scrutiny seems to confirm that none of the extant spp. of Canis qualifies as a plausible main ancestor of the domestic dog, in terms of colouration.

The wolf has

The former seems original in the wolf, and related to the fact that this is the most gregarious species of Canis (https://www.pond5.com/stock-footage/item/102336784-pack-grey-wolves-howling-includes-audio). However, the latter may be partly anthropogenic, i.e. the faintly-expressed pectoral feature in the wolf may possibly be owing to hybridisation with the domestic dog.

Most tellingly: there is no ischial feature, to speak of, in the wolf (https://www.alamy.com/stock-photo-subordinate-european-grey-wolf-canis-lupus-woundad-above-lowered-tail-75483789.html?imageid=50723B43-435F-43EB-BACF-7D27959FF98F&p=80876&pn=1&searchId=1d22485793346b4fb7fbedc88f9fc348&searchtype=0).

With respect to the four extant jackal-like spp.:

CONCLUSIONS

Extensive, symmetrical whitish on the face - reminiscent of that in the wolf - is seen in the domestic dog in a few large-bodied breeds (https://www.akc.org/expert-advice/dog-breeds/wolf-like-dog-breeds/ and https://en.wikipedia.org/wiki/Siberian_Husky and https://www.istockphoto.com/photo/grey-dog-running-away-gm489387274-74666657?phrase=wolf+rear+view&searchscope=image%2Cfilm and https://www.youtube.com/watch?v=RgwVIkybehg).

There seems no reason to doubt that these breeds are derived partly from the wolf.

The following illustrates the distinction. The breed on the left is derived partly from the wolf, that on the right overwhelmingly from C. rubronegrus: https://www.shutterstock.com/image-photo/two-large-breed-dogs-siberian-husky-2336525207.

However, the important point - previously overlooked - is that most of the 339 breeds (https://www.psychologytoday.com/au/blog/canine-corner/201305/how-many-breeds-dogs-are-there-in-the-world) fall into the latter category.

Overall, my interpretation is that the evidence supports the possibility that the main ancestor of the domestic dog is an extinct species, viz. C. rubronegrus, the 'black-and-tan jackal'.

As I see it:
The onus is now on those believing that the domestic dog is derived mainly from the wolf to explain how the ischial flag has arisen:

Please focus on the buttocks in the following of the rottweiler:

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=rottweiler+running&order=relevance&safe_search=1&limit=100&search_page=4&search_type=pagination&get_facets=0&asset_id=106326169
https://stock.adobe.com/video/girl-playing-with-her-jumping-rottweiler-dog-with-a-dog-toy-in-green-forest-in-sunlight/618811963?prev_url=detail
https://stock.adobe.com/images/staffordshire-bull-terrier-and-rottweiler/467393936?prev_url=detail
https://www.instagram.com/namitaology/reel/C0EQrdmyELB/
https://www.dreamstime.com/stock-images-dog-guarding-over-big-ball-image1102044
https://www.alamy.com/stock-photo-back-view-of-rottweiler-standing-england-50947979.html
https://www.shutterstock.com/image-photo/black-tan-rottweiler-puppy-standing-on-1635788887
https://www.dreamstime.com/large-black-dog-stands-middle-trees-green-grass-female-rottweiler-rear-view-large-black-dog-stands-image245840888
https://www.dreamstime.com/stock-photo-rottweiler-puppy-posing-outdoors-adorable-summer-image76737461
https://www.dreamstime.com/man-black-dog-green-grass-adult-male-rottweiler-pet-leash-cropped-tail-standing-walking-park-daytime-back-view-image224187993
https://www.dreamstime.com/meeting-two-black-pets-dog-park-adult-rottweiler-front-doberman-leash-getting-to-know-dogs-walk-daytime-back-image228345291
https://www.dreamstime.com/dried-spikelets-mouse-barley-coat-female-rottweiler-hordeum-murinum-spikelets-dangerous-to-dogs-can-get-image249306759
https://www.dreamstime.com/close-up-back-rottweiler-dog-standing-wild-grasses-dried-spikelets-hordeum-murinum-hair-female-dangerous-image249466722
https://www.dreamstime.com/two-dogs-running-along-empty-path-woods-male-female-rottweiler-sunny-autumn-day-tall-pines-back-view-blurry-image233140176
https://www.dreamstime.com/two-dogs-running-along-empty-path-woods-male-two-dogs-running-along-empty-path-woods-male-image233584983
https://www.dreamstime.com/two-dogs-walking-down-overgrown-grassy-path-natal-midlands-south-africa-two-dogs-walking-down-overgrown-grassy-path-image144508531
https://stock.adobe.com/images/dalmatian-dog-playing-with-rottweiler-puppy/74066222?prev_url=detail
https://stock.adobe.com/images/defocus-blurred-motion-noise-grain-effect-two-dogs-running-t/479975531?prev_url=detail
https://stock.adobe.com/images/beautiful-great-rottweiler-running-in-the-garden-cute-watchdog-playing-outdoors/250307038?prev_url=detail

Posted on January 22, 2024 09:10 PM by milewski milewski

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Posted by milewski 5 months ago

ENCEPHALISATION IN CANIS

https://bioone.org/journals/australian-journal-of-zoology/volume-65/issue-5/ZO17040/Brain-size-body-weight-in-the-dingo-Canis-dingo/10.1071/ZO17040.short

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8057212/

https://www.openveterinaryjournal.com/fulltext/100-1607631247.pdf?1706169594

https://www.jstor.org/stable/20445574

http://www.noonbarra.com/statistics.htm#SIZE

Based on the above references, plus a) Jerison and b) Gittleman and Thompson (1988), it seems that the Australian kelpie (body mass about 10 kg) has an encephalisation quotient of approximately 1.2, which is no less than those of Canis latrans and Canis aureus (both of which alsomweigh about 10 kg).

I further infer that it has retained the brain size of its real ancestor, Canis rubronegrus, despite being domesticated.

Posted by milewski 5 months ago

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