Modern Weights and Measurements of Jaguars

[peter]

(05-23-2020, 09:33 PM)OncaAtrox Wrote:

(05-23-2020, 09:28 PM)Dark Jaguar Wrote:

(05-23-2020, 09:16 PM)OncaAtrox Wrote:

(05-23-2020, 06:47 PM)Dark Jaguar Wrote: @OncaAtrox


If you go back to the previous pages you'll find more Pantanal males weight.

What happened to the live last night? I heard it shut down suddently is it true? theres only 30min of recorded video.  

Tonight I am gonna make questions to Peter Crawshaw, hopefully they'll answer it.

I'm almost done updating the table with all the weights from these thread, but there is one that I'm hesitant to add. According to this news story, this 140 kg male jaguar was killed in a road crash. I don't doubt that such weight is possible but the source might be questionable, what do you think?
https://diarionline.com.br/?s=noticia&id=115578#.Xlfp-w_zEdA.whatsapp

This jaguar I searched in many brazilian news pages to get more details on how he was weighed and by who or even to find extra photos other than that one but I didn't find anything different than that of the link you sent. They only stated it weights 140kg and thats all.

Back when it happened a few facebook pages about jags posted this tragedy as well.

Yes, so sad that such a big male had to die that way. I won't include him in the table just because the weight wasn't provided by an conversational entity or scientific team, nonetheless thanks for your answer!

ONCA

You can solve the reliability problem by adding a number after every weight. If the information is reliable, add a 1. If you're not quite sure, add a 2 (moderate reliability). If you have severe doubts (referring to weights in books or newspaper reports), add a 3. In this way, information will not be lost.  

The new table looks great! If you can produce tables for every region, the result will be overview. 

In a healthy system, big cats, even within regions, usually show a lot of individual variation. Size is affected by many factors. About a century ago, Nepal male tigers had about 4 inches on tigers shot in northern India (referring to total length measured 'over curves'). The reason was tigers were not hunted in Nepal, whereas they were in northern India. Today, tigers in northern India, if anything, are as large as those in Nepal. The main reason is conservation (protection and well-stocked reserves).    

My guess is stress has a profound effect on size. Stress is a result of many variables. In India and Nepal, the effect (on size) was quite limited. In Russia, where tigers were nearly hunted to extinction for nearly half a century (1890-1940), it wasn't. In wild tigers, a (genetic) bottleneck usually results in a lack of individual variation. The effect of a bottleneck is often seen in captive representatives of a subspecies affected by a bottleneck. Captive Amur tigers, for example, show as much variation as in other tiger subspecies. They're also taller, longer and heavier (referring to averages) than all other tiger subspecies.   

Jaguars, like lions, tigers and leopards, show a considerable amount of individual and regional variation. Good information is needed to get to sound conclusions. The more we know, the better. Reply