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Modern Weights and Measurements of Jaguars - Printable Version

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RE: Modern Weights and Measurements of Jaguars - Balam - 06-23-2020

"@Richardrli" jaguar's jaguars there get big because they have readily access to plenty of medium sized prey like caiman and capybara that they can consume regularly as opposed to jaguars on harsher biomes like the Amazon. The cattle does help to make them grow bigger but I'm not sure how much of cattle predation can be attributed to their sizes in Pantanal and los Llanos.


RE: Modern Weights and Measurements of Jaguars - Rishi - 06-23-2020

(06-23-2020, 03:46 PM)Richardrli Wrote: What do you guys make of the theory that the large jaguars of the Pantanal and Llanos are so noticeably bigger than other jaguars populations because they feed on the easy prey of cattle in those areas? The point would be that prior to European colonization they were not so big as their natural prey (or indeed the natural prey of all post Pleistocene jaguars) are relatively small.

There is frankly no way to tell... Do jaguars from all of Pantanal/Llanos have access to livestocks?.. Or only the outliers?
Only way to say with some certainty is if any behavioural study was conducted on predation choice & prey size of jaguars of several regions. 

For example, tigers that live deep inside the reserves where they have negligible availability of livestock, tend to be larger instead. But that is because of natural-selection as the largest can afford to grab territories of their choice in the core area. While the smaller pushovers have to move outside towards the less desirable fringe forests. Although these are the ones that depend on cattle in those parts with fewer wild prey.

I trust in case of jaguars too, there would be way too many variables in every case that play varying roles in determining their size.


RE: Modern Weights and Measurements of Jaguars - Balam - 06-23-2020

(06-23-2020, 04:23 PM)Rishi Wrote:
(06-23-2020, 03:46 PM)Richardrli Wrote: What do you guys make of the theory that the large jaguars of the Pantanal and Llanos are so noticeably bigger than other jaguars populations because they feed on the easy prey of cattle in those areas? The point would be that prior to European colonization they were not so big as their natural prey (or indeed the natural prey of all post Pleistocene jaguars) are relatively small.

There is frankly no way to tell... Do jaguars from all of Pantanal/Llanos have access to livestocks.
Only way to tell with some certainty is if any behavioural study was conducted on predation choice & prey size of jaguars of several regions. 

For example, tigers that live deep inside the reserves where they have negligible availability of livestock, do tend to be larger instead. But that is because of natural-selection as the largest can afford to grab territories of their choice in the core area. While the smaller  pushover have to move outside towards the less desirable fringe forests. Although they depend on cattle in those part of less prey availability.

I trust in case of jaguars too, there would be way too many variables that play a rolerole in determining their size.
Yes, some of the jaguars we follow on here from Northern Pantanal in Porto Jofre aren't to my knowledge cattle killers and they consistently grow past 130 kg in weight (prime males), so it's probably just the readily access to caiman of good sizes that allows them to grow big. The tiger analogy is really good too.


RE: Modern Weights and Measurements of Jaguars - Pckts - 06-23-2020

Northern Pantanal Jagaurs generally kill far less cattle than other populations and infact it's usually the Females with cubs that will kill cattle during the flood season more so than the males. And even more in depth is that its specific females, but overall, Northern Pantanal Jaguars which are said to be the largest Jaguars rarely kill cattle. But what they do have is the highest population of Caiman and the least molested landscape as well best protections offered to any Jaguar population. For now at least but the destruction of habitat for soy production is quickly changing that.


RE: Modern Weights and Measurements of Jaguars - Dark Jaguar - 06-23-2020

@Richardrli


Despite having its natural preys available the Cattles do boost the sizes of jaguars that got access to it and predate it more often. Pantanal and Llanos aren't the only biomes that has/had large jaguars and with cattle access. When it comes to cattle access, Cerrado jaguars also got access to cattles and they're pretty big, jaguars from the extinct Varjão do Paranazão ( currently Porto-Primavera ) had access to cattles and which despite jaguars from that mini-biome having its natural preys the cattles from nearby farm was the main reason for their boost in sizes able to rival the Pantanal jaguars, Caatinga jaguars also gave ranchers many headaches in the past.

Prior to European colonization I wouldn't say they were that small, their natural prey range was much more diverse galore in all biomes, unlike modern days where most of the fauna jaguar live is found almost all wiped out by humans. Its not only about having big preys, the vast abundance of preys is also very important on a predator's size. However unfortunately most biomes of nowadays lack it for obvious reasons.


RE: Modern Weights and Measurements of Jaguars - epaiva - 06-23-2020

A new book named Jaguars of the Northern Pantanal was published recently, according to Paulo Barreiros and Rafael Hoogesteijn it is a very very good and complete one 

*This image is copyright of its original author



RE: Modern Weights and Measurements of Jaguars - Pckts - 06-23-2020

(06-23-2020, 07:27 PM)epaiva Wrote: A new book named Jaguars of the Northern Pantanal was published recently, according to Paulo Barreiros and Rafael Hoogesteijn it is a very very good and complete one 

*This image is copyright of its original author

Just speaking with Paulo now, they're getting hit by the covid crisis and could use all the support we can give. The book is a little pricey but it goes to a great cause and will have amazing detail. I'll be ordering mine today


RE: Modern Weights and Measurements of Jaguars - Balam - 06-23-2020

I'll be ordering mine as well to support, plus it's going to be a great addition to my books collection.


RE: Modern Weights and Measurements of Jaguars - Pckts - 06-23-2020

(06-23-2020, 08:25 PM)OncaAtrox Wrote: I'll be ordering mine as well to support, plus it's going to be a great addition to my books collection.

I just ordered mine but they're not shipping to the states just yet, hopefully I'll get one soon.


RE: Modern Weights and Measurements of Jaguars - Dark Jaguar - 06-24-2020

102kg Milagre jaguar ( miracle in portuguese )

 




*This image is copyright of its original author



RE: Modern Weights and Measurements of Jaguars - Balam - 06-24-2020

(06-24-2020, 03:05 AM)Dark Jaguar Wrote: 102kg Milagre jaguar ( miracle in portuguese )

 




*This image is copyright of its original author

Do you know or have an idea of his age? I'll add him to the table.


RE: Modern Weights and Measurements of Jaguars - Dark Jaguar - 06-24-2020

(06-24-2020, 03:27 AM)OncaAtrox Wrote:
(06-24-2020, 03:05 AM)Dark Jaguar Wrote: 102kg Milagre jaguar ( miracle in portuguese )

 




*This image is copyright of its original author

Do you know or have an idea of his age? I'll add him to the table.

I am not sure but given that Jairzão male from northern pantanal weighed 82kg at 6 years old I wouldn't be surprised if Milagre male is adult. By the way this is not a Cerrado jaguar its a pantanal one.


RE: Modern Weights and Measurements of Jaguars - Dark Jaguar - 06-28-2020

There was an amazing live a few days ago by Onças do Iguaçú

Too bad I missed it live.

But I managed to watch it since it gets saved for those who missed it.

It was full of amazing content and infos.






I managed to ask Wezddy about this amazonic adult male jaguar captured in the Mamirauá reserve - Amazon.

She told me he weighed 49kg.



*This image is copyright of its original author



RE: Modern Weights and Measurements of Jaguars - Balam - 07-03-2020

We finally received the weight for the male captured by Reprocon, Thor 116 kg!




RE: Modern Weights and Measurements of Jaguars - Dark Jaguar - 07-03-2020

(07-03-2020, 08:12 AM)OncaAtrox Wrote: We finally received the weight for the male captured by Reprocon, Thor 116 kg!




@"OncaAtrox"

When you add Thor to the table I'd like you to take advantage and add Mancha Preta male's age.


Mancha Preta male weighed 101kg and was 5 years old when captured.

July 27th 2016

''Capture of "Mancha Preta", male, 5 years old, 101 kg, excellent physical condition.
This animal was equipped with a new GPS / Globalstar collar produced by the Brazilian company Nortronic Sistemas Eletrônicos do Nordeste.''

https://www.facebook.com/oncasdorionegro/photos/a.1036369863051784/1124319827590120/?type=3&theater



*This image is copyright of its original author



Just like Jairzão male it is the reason why I wouldn't be surprised if Milagre male 102kg is adult too.




I was in contact again with Jorge ( who participed of Tiago cerrado male's capture and told me his weight of both captures ) he told me modern cerrado male jaguar's average weight is around 90kg today, cerrado male jaguar can get really big, he told me.

I also took advantage and asked him about the sooo wanted Rogério cerrado male's weight.

He said he doesn't know this one. probably he wasn't there in cerrado on Rogério's capture.

I also asked a girl who works with captures for Reprocon, she also doesn't know Rogério's weight.

But at least now we know cerrado males average is larger than in 2002.

Something we all already assumed could be true.

I think the only one to answer Rogério's weight is Leandro unfortunately, its really hard to get infos from him.