Great white sharks are overheating

Hypatia

Ars Centurion
267
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And finally, the humans had been judged by Moonshark to be unworthy of the gift they had been given, the Pale Blue Dot.
And there was great weeping and gnashing of teeth, and humming of engine as Moonshark took revenge upon humanity for the selfish and stupid ways of those end days.
- Revelation of Moonshark; 13:12-13

IMG_2071.gif
 
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96 (102 / -6)
Haven't these mesothermic fish been around for much longer than the current ice age?

So what did these fish do 35 million years ago, when earth was much warmer and without ice caps?

Have these animals evolved to cope with the lower temperatures we currently have? Or were they restricted to the polar regions back then?

Edited for clarity
 
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43 (45 / -2)
Haven't these mesothermic fish been around for much longer than the current ice age?

So what did these fish do 35 million years ago, when earth was much warmer and without ice caps?

Have these animals evolved to cope with the lower temperatures we currently have? Or were they restricted to the polar regions back then?

Edited for clarity
Perhaps humans weren't destroying their food supply back then.
 
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60 (63 / -3)

Sajuuk

Ars Legatus Legionis
13,317
Haven't these mesothermic fish been around for much longer than the current ice age?

So what did these fish do 35 million years ago, when earth was much warmer and without ice caps?

Have these animals evolved to cope with the lower temperatures we currently have? Or were they restricted to the polar regions back then?

Edited for clarity
Adaptation is easier in response to millions of years of climate change compared to hundreds of years of unnatural acceleration.
 
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125 (129 / -4)

no_great_name

Ars Centurion
381
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Perhaps humans weren't destroying their food supply back then.
From the gist of the article it really does seem to be the two-pronged attack on their energy budget that is the real problem. 35 million years ago they were undisputed apex predator species. Warmer waters may have imposed limitations on them, but that was likely the only significant limitation they were dealing with - now they are also second fiddle to industrial humans in the competition for food.
 
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62 (62 / 0)

numerobis

Ars Tribunus Angusticlavius
51,012
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Haven't these mesothermic fish been around for much longer than the current ice age?

So what did these fish do 35 million years ago, when earth was much warmer and without ice caps?

Have these animals evolved to cope with the lower temperatures we currently have? Or were they restricted to the polar regions back then?

Edited for clarity
If the climate were stable they’d be fine. The problem is the rapid changes, which means they are now evolved for warmer temperatures than they’re experiencing, and same with their food web. All of it needs to find a new equilibrium, on evolutionary timescales.

Add on top of that humans essentially mining ocean biomass rather than sustainably harvesting it, and they are under severe stress.
 
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42 (43 / -1)

Veritas super omens

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If the climate were stable they’d be fine. The problem is the rapid changes, which means they are now evolved for warmer temperatures than they’re experiencing, and same with their food web. All of it needs to find a new equilibrium, on evolutionary timescales.

Add on top of that humans essentially mining ocean biomass rather than sustainably harvesting it, and they are under severe stress.
They might not have been fine due to all the other stresses. Things like petrochemical based toxins, lack of food due to strip mining of fish stocks.
 
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11 (12 / -1)

Fatesrider

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25,396
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Haven't these mesothermic fish been around for much longer than the current ice age?

So what did these fish do 35 million years ago, when earth was much warmer and without ice caps?

Have these animals evolved to cope with the lower temperatures we currently have? Or were they restricted to the polar regions back then?

Edited for clarity
It's not JUST the warming waters.

It's that the food they need isn't there due to overfishing.

The last 35 million years didn't have mankind fishing out the water so they had no food where they might be able to still survive - until about the last century or so. That's why they're going to have issues in the coming years.
 
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37 (38 / -1)

Vnend

Ars Scholae Palatinae
1,062
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Haven't these mesothermic fish been around for much longer than the current ice age?

So what did these fish do 35 million years ago, when earth was much warmer and without ice caps?

Have these animals evolved to cope with the lower temperatures we currently have? Or were they restricted to the polar regions back then?

Thank you! That was the first thing that came to mind as I was reading the article.

Remember folks, the northern tip of Greenland used to be a lush, temperate forest just a million or so years ago.

And, while on a boat tour of the Treshnish Isles east of the Isle of Mull off Scotland about thirty years ago, the owner/operator of the boat we were on pointed out a basking shark cruising along on a parallel course as we headed south. He recalled that, when he was younger, the guy he'd crewed for told him that when he was learning the ropes, you'd see shoals of basking sharks on clear days that were all you could see looking down. Over fishing had thinned them out by the mid- to late-1990s to where they were a rare sight, and now over heating oceans were bringing previously rare fish like oceanic sunfish in the the waters off Mull.

(And, even then, the changing water temps were causing problems up and down the food chain. Puffins nesting on Lunga, one of the larger of the Treshnish isles, were having trouble finding enough of their food fish to feed their chicks after they hatched. Scientists using cameras to inspect the burrows after the breeding seasons for the last few years before our trip were finding far more remains of dead chicks than they had even ten years before. It wasn't known how much longer puffins we be coming to Lunga to nest. (When we revisited the area with our offspring in 2005, they were still there, but significantly fewer than even just eight years before.) Pity, they are cute little birds...)
 
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29 (29 / 0)

Vnend

Ars Scholae Palatinae
1,062
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If the climate were stable they’d be fine. The problem is the rapid changes, which means they are now evolved for warmer temperatures than they’re experiencing, and same with their food web. All of it needs to find a new equilibrium, on evolutionary timescales.

I think you mean "cooler", not warmer waters. Doubtless they can probably adjust to changing temps over time, but it takes time for them to reset their internal thermostat (generations, probably), and lack of foresight/greed aren't giving them anything like the time they've had in the past.
 
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13 (14 / -1)
Wait, is this why the ultra rich class keeps building bunkers and hideaways?

You're not going to tell me they knew they're dooming the planet and, instead of helping, they just created safe places for themselves.. right?
What I have trouble understanding is how they could not enjoy wildlife enough to at least want some nice things so they can go on photo safari or whatever, and knowing that even zoos don't really do the job of maintaining the world in a suitable condition so they should want to save the environment.

But I guess they literally only get satisfaction of any kind from seeing their money increase, and maybe some kinky sex and drugs... Maybe, but maybe it's just the chasing money they care about. What a shitty kind of person to look up to and want to put in charge of everything because of how "smart" they are. Rev. Wright might have been right when he said "God damn America!"
 
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17 (18 / -1)
Doing fish dissections in the mid 2010s a lab teacher who worked with state fish & wildlife mentioned large tuna being caught and they had abnormally injured or necrotic deep muscle tissue causing premature loss of quality and lower valued carcasses and they didn't know why. I wonder if this has anything to do with it.
 
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11 (11 / 0)

PlunderBunny

Ars Centurion
399
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I would have thought that this problem would be an ideal natural selection path - wouldn’t sharks that have an ability to tolerate higher temperatures (e.g. by a ‘natural’ mutation) gain a significant advantage?
I guess that the timeframe for this is too long for us to see it, and the other pressures (habitat distraction, overfishing) are more significant.
 
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-3 (2 / -5)

PlunderBunny

Ars Centurion
399
Subscriptor
Doing fish dissections in the mid 2010s a lab teacher who worked with state fish & wildlife mentioned large tuna being caught and they had abnormally injured or necrotic deep muscle tissue causing premature loss of quality and lower valued carcasses and they didn't know why. I wonder if this has anything to do with it.
I remember seeing a news item about tuna being ‘fish farmed’ in large tanks. The tanks were huge, and had curved walls, and the rooms that the tanks were in were kept as quiet as possible. The reason was that when tuna were startled, then reacted with a sudden burst of energy and moved forward rapidly. A loud noise or accident could result in many of the tuna smashing themselves against the edge of the pool, and being injured or even dying. Perhaps something similar happens in the wild? (Although you mention deep muscle tissue, and I would have thought that blunt force injuries would have been nearer the surface)
 
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2 (2 / 0)

numerobis

Ars Tribunus Angusticlavius
51,012
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I think you mean "cooler", not warmer waters. Doubtless they can probably adjust to changing temps over time, but it takes time for them to reset their internal thermostat (generations, probably), and lack of foresight/greed aren't giving them anything like the time they've had in the past.
Oh, right, I flipped it accidentally.
 
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5 (5 / 0)

pkirvan

Ars Praefectus
3,628
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They're gonna need a colder ocean.

Unfortunately, short of a nuclear winter, they're not going to get it.
Did you even bother to read the article? Or do you just jump right to the comments whenever a headline mentions warming? The article says:
Declines of great white sightings in False Bay, Mossel Bay, and Gansbaai, however, are multifaceted. Though thermal relocation may be a contributor, their population decline is also linked to a history of overfishing, shark netting, and habitat destruction.

Indeed, though warming waters heighten mesotherms’ vulnerability worldwide, other manmade harms exert the most danger. “If we had to say what is the one thing that we need to urgently address for these animals, it’s the fishing problem,” said Payne. “The most acute, urgent crisis these animals face is from overfishing, and particularly now from bycatch.”
I get the obsession with climate change, I really do, but far and away the most biodiversity loss now and throughout human history is from habitat destruction. Unlike with climate change, huge international agreements aren't needed to produce meaningful results. They would certainly help, especially for migratory animals, but governments can start protecting habitat on their own territory any time they wish.
 
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-17 (3 / -20)
The news networks absolutely LOVES to blow every shark attack way out of proportion and keep that fear of them as this looming threat that must somehow be "dealt with", all for the purely selfish ratings boost of course. Heck the movie Jaws was more sympathetic to the need to preserve them as a species (outright making the Jaws shark some kind of mutant abomination outside the natural order). As a result, it's going to be difficult to get the average person hearing this news to say anything other than "well- good riddance". It's just like that upcoming "parent's decision" act they're about to pass to try and illogically force all operating systems, everywhere, whether for offline devices or not, to require age verification somehow. That's going to be awkward to implement into a thermostat.
 
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-2 (2 / -4)

SteveG753

Smack-Fu Master, in training
1
They will move offshore or migrate North/South to colder water and change their range to survive. Simple evolution that has been happening for thousands and thousands of years. Better fishery management throughout the globe is necessary. Commercial fishing takes must be frozen at current levels or reduced on ALL species to maintain vibrant quantities and reproduction. We cant just blame CO2 for warming and species losses when human take is what is killing the oceans. 3 year ban on all fishing and force countries to reduce demand and take across the board. Yes, I know this is inconvenient for fishing communities but they need to replace their need for fish when population growth continues to grown demand exponentially.
 
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-12 (5 / -17)