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Post by theundertaker45 on May 27, 2020 11:31:14 GMT -5
King KodiakI've taken a closer look at the weight analysis of polar bears I once did over at Carnivora and the average weight of adult polar bears (5 years+) is ~1075lbs based on 9 populations; the largest are the Foxe Basin polar bears averaging ~1300lbs and the smallest are the Svalbard polar bears averaging ~850lbs. The 1089lbs weight figure for fully grown Kodiak bears is based on seven specimens that Troyer weighed personally, nothing left to say here.
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Post by King Kodiak on May 27, 2020 11:39:03 GMT -5
Ok i guess. The only chart i have seen from Hensel and Troyer is the one that has 5 specimens of 8-9 year olds. Are you able to post the link where those 7 specimens are weighted? Thats the last thing i ask.
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Post by theundertaker45 on May 27, 2020 11:40:53 GMT -5
Adult Weight: "Four males weighed in the fall ranged from 960 - 1,346 pounds and three spring species ranged from 813 - 1190 lbs."Link is here at Carnivora: carnivora.net/-t2935.html? (one of Ursus Arctos' comments)
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Post by King Kodiak on May 27, 2020 11:52:44 GMT -5
Yeah, that is from this famous chart here. Those 7 specimens are on the right paragraph. The problem is those are in "ranges" , they dont specify the individual weights, so how did you calculate that 1089 lb average? Am just trying to understand.
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Post by theundertaker45 on May 27, 2020 11:56:48 GMT -5
I took the median of the two ranges as the additional weights, however, you are probably right; in order to have a fully reliable set of data we should only use the four specimens with precise weights (the lower and upper end of the ranges) which would result in an average weight of ~488.7kg (1077.3lbs).
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Post by King Kodiak on May 27, 2020 13:26:09 GMT -5
Obviously, my favorite bear is the Kodiak (the best of the land), but a mature male kodiak being heavier on average than a mature male polar goes against everything we have always thought. Maybe am wrong, but i dont know.
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Post by theundertaker45 on May 27, 2020 14:07:59 GMT -5
King Kodiak You have to differentiate between fully grown and mature, that's why I made the remark in brackets. If you remove all the polar bears being younger than 9 years, the average will most likely also be decently higher.
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Post by King Kodiak on May 27, 2020 14:14:10 GMT -5
I see what you mean. But up to now, when we talk about "mature", that supposedly means full grown. Not full grown would be a "young" adult male. But its just a game of words.
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Post by theundertaker45 on May 27, 2020 14:37:39 GMT -5
Oh okay, I didn't know that; when I am talking about mature I mean "sexually mature".
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Post by King Kodiak on May 27, 2020 14:53:33 GMT -5
Taker, what i dont understand is this: if Troyer weighted those 7 bears to the right, why didnt he add them to the 5 bears in the chart to the left? Obviously those 7 specimens were more than 9 years old. Those ranges were huge, so those 12 bears together would have raised the average weight alot more than 835 lbs, maybe closer to 900 lbs. Just speculating.
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Post by theundertaker45 on May 27, 2020 14:56:48 GMT -5
King Kodiak I honestly don't know why he left them out. The table ends at the age group of 8-9 years, unfortunately. Some of the bears were probably older than 9 years, that's why he couldn't add them to this specific age group. It's really sad to see that the last extensive study on Kodiak bears dates back to 1969 and absolutely nothing gets published nowadays... People are too busy killing them I guess...
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Post by King Kodiak on May 27, 2020 15:45:31 GMT -5
Well, if we analyze that chart, if we read up top on the "physical description", Troyer (who is one of the best authorities on kodiaks), states, "mature males commonly weight over half a ton, with some exceptional specimens approaching 1500 lbs". Half a ton would be 453 kg (1000 lbs) (USA and Canada) , commonly means "very often, frequently".
URSUS ARCTOS MIDDENDORFFI THE BEST OF THE LAND.
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Post by brobear on May 28, 2020 16:02:23 GMT -5
King Kodiak I honestly don't know why he left them out. The table ends at the age group of 8-9 years, unfortunately. Some of the bears were probably older than 9 years, that's why he couldn't add them to this specific age group. It's really sad to see that the last extensive study on Kodiak bears dates back to 1969 and absolutely nothing gets published nowadays... People are too busy killing them I guess... I just cannot believe that all biology study of bears have simply stopped happening. Also, there should be some avenue of getting copies of those studies. I believe its just a matter of discovering the source. Your thoughts?
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Post by theundertaker45 on May 28, 2020 16:34:36 GMT -5
brobear There are a lot of studies on bears, however, very few of them are on the bears living on the Kodiak Archipelago and practically no single recent study deals with their growth patterns/size; it just doesn't seem to be important to most biologists/naturalists.
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Post by brobear on Jul 3, 2020 9:29:35 GMT -5
By Warsaw: New morphometric data Ursus arctos lasiotus Average body weigth for adult males ≥ 8 year old =257.7 kg body length = 211 cm Average body weight for adult female ≥ 7 year old 163.75 kg Average body weight for adult female ≥ 4 year old 150 kg body length =178 cm Space Use by Brown Bears (Ursus arctos) in the Sikhote-Alin Ivan V. Seryodkin*a , Alexey V. Kostyriab , John M. Goodrichc and Yuriy K. Petrunenko 211 cm = 6 feet 11 inches. / 257.7 kg = 568 pounds. 163.75 kg = 361 pounds. Some more up-dated data.
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Post by King Kodiak on Jul 3, 2020 9:38:15 GMT -5
So where is the source for this? Because we have the average as 582 lbs according to Kucherenko. I know 14 lbs is basically the same, but i still would like a source.
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Post by King Kodiak on Jul 3, 2020 9:46:14 GMT -5
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Post by OldGreenGrolar on Jul 9, 2020 4:35:40 GMT -5
Both animals above are about the same length. The Amur tiger might be slightly longer but not as heavy.
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Post by King Kodiak on Jul 9, 2020 6:27:15 GMT -5
Both animals above are about the same length. The Amur tiger might be slightly longer but not as heavy. Actually, at head and body length, the bear is just slightly longer, 196 cm to 195 cm. (Not counting the tiger's tail, that is why for the tiger they also have a "total length" field).
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Post by brobear on Jul 9, 2020 6:30:57 GMT -5
Quote: The latest chart made by GuateGojira has Ursus arctos Lasiotus at an average weight of 270 kg (595 lbs) *We all know how this works. A group of biologists could come in and do a study. Two years later another study at same location. Each study will be with different individual bears. Their findings will not match. To get an exact / precise average ( for a full-grown male brown bear of any particular location ) these biologists would have to dart, measure and weight each and every male bear 9+ years old ( impossible task ). Even then, a few years later, this number will change. We also know that this 595 pounds includes bears from 5 years old and up... which ( IMO ) would make a full-grown boar perhaps 700 pounds - average.
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