Brown bear basic morphology

[oldgreengrolar]

Post accounts on that here.

[kevin]

American Brown Bears have greater chest girth than Lions of equal body mass.In fact, a 200 kg Coastal Grizzly would have a chest circumference of 128,6 cm as per this equation :


www.jstor.org/stable/3872886?origin=JSTOR-pdf

And Yellowstone Grizzlies which approach 200 kg on average have an even greater girth of 130,5 cm :



pubs.er.usgs.gov/publication/70121509

Whereas a 200 kg African Lion would get 125,3 cm using this equation :



books.google.co.ma/books?id=S4OREAAAQBAJ&pg=PA353&dq=lion+chest+girth&hl=fr&newbks=1&newbks_redir=0&source=gb_mobile_search&sa=X&ved=2ahUKEwi13uuIhJv-AhVSUqQEHXBQBSQQuwV6BAgDEAc#v=onepage&q=lion%20chest%20girth&f=false

[kevin]

Proving that Brown Bears own proportionally stronger shoulders and forelimbs than lions :

justpaste.it/5ap41

[kevin]

Proving that Brown Bears have relatively stronger shoulders and forelimbs than jaguars :

justpaste.it/7pkf8

[kevin]

Comparing Siberian Tigers and ussuri Brown Bears :

justpaste.it/43eq4

[oldgreengrolar]

/\ Thanks Kevin for the info.

[kevin]

You're welcome

[kevin]

Brown Bears pretty much have stronger shoulders than Polar Bears of similar size :

Shoulder Hump:
The large dorsal hump distinguishes brown bears from other species. The hump contains muscles that add strength and power to the forelimbs.
U.Maritimus : Absent
U.Arctos : Present
Edge : U.Arctos
Scapula Shape Index:
It's scapula width/forelimb length ratio.Higher score indicates greater muscle attachement on the shoulder joint as well as greater ability to make certain movements like full-functional upper extremity movement including protraction,retraction,elevation,depression,upward rotation,and downward rotation all else being equal.
U.Maritimus : 26%
U.Arctos : 26%
Edge : Draw
Scapula Length Index:
Scapula length divided by Forelimb length. Higher score Indicates exertion of greater force from the Forelimb.
U.Maritimus : 29%
U.Arctos : 30%
Edge : U.Arctos
API:
Acromion process length/forelimb length. Higher score in this ratio increases attachment for the deltoid muscle.
U.Maritimus : 6%
U.Arctos: 6%
Edge : Draw
SMI:
Deltopectoral crest length divided by humerus length. Higher score Displays greater mechanical advantage of deltoid and pectoral muscles at the shoulder joint and provides a larger inlever and thus greater inforce.
U.Maritimus : 69%
U.Arctos : 72%
Edge : U.Arctos

References :

www.researchgate.net/publication/230843015_Postcranial_morphology_and_the_locomotor_habits_of_living_and_extinct_carnivores

www.researchgate.net/publication/247494638_Ecomorphology_of_the_giant_short-faced_bears_Agriotherium_and_Arctodus

www.researchgate.net/publication/229063824_A_universal_scaling_relationship_between_body_mass_and_proximal_limb_bone_dimesions_in_quadrupedal_terrestrial_tetrapods

[oldgreengrolar]

/\ You are right. Brown bears are stronger at the shoulders pound to pound but polar bears are overall stronger as they are larger. Only a Kodiak bear can rival a polar bear, only the Foxe Basin subspecies is heavier By a decent weight margin.

[kevin]

Jul 14, 2023 6:14:14 GMT oldgreengrolar said:

/\ You are right. Brown bears are stronger at the shoulders pound to pound but polar bears are overall stronger as they are larger. Only a Kodiak bear can rival a polar bear, only the Foxe Basin subspecies is heavier By a decent weight margin.

Agreed

[kevin]

Weight data for Brown Bears across their North American range :



www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.bearbiology.org/fileadmin/tpl/Downloads/URSUS/Vol_7/Blanchard_Vol_7.pdf&ved=2ahUKEwiwq92fo6yAAxVeUqQEHfL8Ap4QFnoECAwQAQ&usg=AOvVaw0fqXzXcC_naUsJfhGiiUJo



www.researchgate.net/publication/284678859_Brown_bear?enrichId=rgreq-628f82fba68bbb24aea0ecde0d73da52-XXX&enrichSource=Y292ZXJQYWdlOzI4NDY3ODg1OTtBUzo0NjkwODAyNTI2NTM1NjhAMTQ4ODg0ODg1NTY5NA%3D%3D&el=1_x_2&_esc=publicationCoverPdf

[oldgreengrolar]

In the first chart above, the Peninsula Alaskan brown bear is heavier only because it is 9 years old while the Kodiak bear is 6 years old.