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Post by stoneage on Jan 7, 2009 22:55:22 GMT
;D Sharks have been around for 350my. Marine mammals didn't appear till after the Dinosaurs. They evolved from a small deer like animal about the size of a cat. One of the earlier whales was Ambulocetus. Whales and Sharks have co-existed for nearly 65MY. Basilosaurus ( a mammal) was the apex predator from 40 ro 34 MYA. Megalodon was the apex predator from 18 to 3 MYA. It is though by scientist these became extinct due to abrupt global cooling of the earth, changing ocean circulation and a shortage of food. Remains of a large prehistoric baleen whale excavated in the Chesapeake Bay suggest that an attacking C. Megalodon may have been more aggressive then that of the Great White Shark. It appears they focused their attack on the bony portions of the prey, which White Sharks usually avoid. Today two apex predators co-exist the Orca and Great White Shark. The Orca eats sharks but it is extremely rare for them to attack each other. There are 360 species of sharks presently. There are about 88 species of whale. Some people think the whale was responsible for the decline of Megalodon. The Sperm whale extremely rarely eats a shark, never a White Shark as far as we know. Whales have nothing to do with the decline of sharks at any time. They have existed together since the Eocene and flourish today. Listen Read Learn ;D
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Post by [][][]cordylus[][][] on Jan 7, 2009 22:59:31 GMT
Well Mr. Shark expert, you misspelled "Megalodon" in the title. And whales COULD have been the reason of Megalodon extinction. Megs ate whales most of the time. If whales moved to polar regions where megs couldn't live, the megalodon species could have died out. So whales could have affected some sharks. Why point out all those shark and marine reptile facts stoneage?
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Post by tetonbabydoll on Jan 7, 2009 23:09:18 GMT
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Post by [][][]cordylus[][][] on Jan 7, 2009 23:16:35 GMT
I am missing something then.
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Post by stoneage on Jan 7, 2009 23:37:07 GMT
Well Mr. Shark expert, you misspelled "Megalodon" in the title. And whales COULD have been the reason of Megalodon extinction. Megs ate whales most of the time. If whales moved to polar regions where megs couldn't live, the megalodon species could have died out. So whales could have affected some sharks. Why point out all those shark and marine reptile facts stoneage? ;D I was just trying to see if you would catch that misspelling. Scientist don't think whales killed off Megalodon. There are sharks in the artic. The largest of which is the Greenland shark at 21 feet long. Sharks in the artic include the Blue Shark, Porbeagle, Salmon Shark, Basking Shark, Bluntnose Sixgill, Spiney Dogfish and Pacific Sleepers, and Greenland Shark. The reason I'm pointing this out is because some people are manufacturing conclusions without any evidence! I now have to take a vow of silence! ;D
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Post by arioch on Jan 7, 2009 23:51:46 GMT
Then why Megalodon get extincted, in your opinion?
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Post by tetonbabydoll on Jan 8, 2009 0:56:20 GMT
There are always those that believe they may not be entirely extinct and that a few still live out there in the deep somewhere. I could happen I suppose. I know the ceolocanth sp? was thought to have been extinct until rediscovered, and the deep ocean is still largely unexplored. It is a fun lil thought, and keeps my pale white ass outta the water.....
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Post by sbell on Jan 8, 2009 1:30:15 GMT
There are always those that believe they may not be entirely extinct and that a few still live out there in the deep somewhere. I could happen I suppose. I know the ceolocanth sp? was thought to have been extinct until rediscovered, and the deep ocean is still largely unexplored. It is a fun lil thought, and keeps my pale white ass outta the water..... 4 things--1) regarding the title--Carcharocles megalodon IS a shark, so the title is redundant 2) Ambulocetus was not exactly a whale--it was still pretty terrestrial-shaped (very crocodile-like); and the size of an ancestor has no bearing on anything (the earliest placoderms--probable sharks sister group--fit in your hand, but what's the point of that in this particular discussion) 3) I don't get it--the first post is like a short Wikipedia article, as opposed to an actual start of discussion. What is the discussion supposed to be here? 4) Latimeria chalumnae is a modern species; Latimeria is not known in the fossil record (or wasn't at the time of discovery). The Sarcopterygian group Actinistia was thought extinct but a surviving member was later discovered. It is a subtle difference, but an important one. It would be like finding a modern panderichthyid (how cool would THAT be?)--the found species would not be a fossil relic; it would be a modern descendant of an otherwise extinct lineage.
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Post by arioch on Jan 8, 2009 1:42:44 GMT
Meh, megalodon is extinct. Not a matter of discussion. Their prey disappeared, and then, they do. It happens constantly.
Leave the cryptozoological theories for the crap B movies.
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Post by [][][]cordylus[][][] on Jan 8, 2009 1:45:59 GMT
Well Mr. Shark expert, you misspelled "Megalodon" in the title. And whales COULD have been the reason of Megalodon extinction. Megs ate whales most of the time. If whales moved to polar regions where megs couldn't live, the megalodon species could have died out. So whales could have affected some sharks. Why point out all those shark and marine reptile facts stoneage? ;D I was just trying to see if you would catch that misspelling. Scientist don't think whales killed off Megalodon. There are sharks in the artic. The largest of which is the Greenland shark at 21 feet long. Sharks in the artic include the Blue Shark, Porbeagle, Salmon Shark, Basking Shark, Bluntnose Sixgill, Spiney Dogfish and Pacific Sleepers, and Greenland Shark. The reason I'm pointing this out is because some people are manufacturing conclusions without any evidence! I now have to take a vow of silence! ;D And all those sharks are not from the tropics like Megalodon. Do you ever see tropical sharks such as Grey reef sharks and epaulette sharks in the arctic? And pacific sleepers and greenlands are the same thing BTW.
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Post by Tyrannax on Jan 8, 2009 6:19:08 GMT
What is the point of this thread? If there a conflict at all? ;D
I'm going to go start a thread called T-Rex and give everyone random facts. ;D ;D
Lol, anyway, as much as I disagree with JFC, it did portray a fairly accurate battle. Whales groups, or pods, are normal. Whales travel in groups, and if a lone shark, massive as it was, were to even come close to a pod, it would most certainly set off a hornets nest.
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Post by stoneage on Jan 9, 2009 0:47:15 GMT
Then why Megalodon get extincted, in your opinion? ;D The answer to your question was in my statement. Read it again. ;D
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Post by stoneage on Jan 9, 2009 1:12:57 GMT
There are always those that believe they may not be entirely extinct and that a few still live out there in the deep somewhere. I could happen I suppose. I know the ceolocanth sp? was thought to have been extinct until rediscovered, and the deep ocean is still largely unexplored. It is a fun lil thought, and keeps my pale white ass outta the water..... 4 things--1) regarding the title--Carcharocles megalodon IS a shark, so the title is redundant 2) Ambulocetus was not exactly a whale--it was still pretty terrestrial-shaped (very crocodile-like); and the size of an ancestor has no bearing on anything (the earliest placoderms--probable sharks sister group--fit in your hand, but what's the point of that in this particular discussion) 3) I don't get it--the first post is like a short Wikipedia article, as opposed to an actual start of discussion. What is the discussion supposed to be here? 4) Latimeria chalumnae is a modern species; Latimeria is not known in the fossil record (or wasn't at the time of discovery). The Sarcopterygian group Actinistia was thought extinct but a surviving member was later discovered. It is a subtle difference, but an important one. It would be like finding a modern panderichthyid (how cool would THAT be?)--the found species would not be a fossil relic; it would be a modern descendant of an otherwise extinct lineage. ;D 1. Yes it is! 2. True but it's name means walking whale and they did evolve into actual whales. 3. This is more of a response. The point to me is that Whales have not caused a decline in sharks and specifically have nothing to do with megalodons extinction. As you can see people have responded. 4. What is your question?
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Post by stoneage on Jan 9, 2009 1:22:05 GMT
Meh, megalodon is extinct. Not a matter of discussion. Their prey disappeared, and then, they do. It happens constantly. Leave the cryptozoological theories for the crap B movies. ;D What cryptozoology theories? If you don't want to discuss it then move on. Oh, and don't tell me what to do! ;D
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Post by stoneage on Jan 9, 2009 1:31:48 GMT
;D I was just trying to see if you would catch that misspelling. Scientist don't think whales killed off Megalodon. There are sharks in the artic. The largest of which is the Greenland shark at 21 feet long. Sharks in the artic include the Blue Shark, Porbeagle, Salmon Shark, Basking Shark, Bluntnose Sixgill, Spiney Dogfish and Pacific Sleepers, and Greenland Shark. The reason I'm pointing this out is because some people are manufacturing conclusions without any evidence! I now have to take a vow of silence! ;D And all those sharks are not from the tropics like Megalodon. Do you ever see tropical sharks such as Grey reef sharks and epaulette sharks in the arctic? And pacific sleepers and greenlands are the same thing BTW. ;D CT you have to remember that the oceans were noticeably warmer during the Miocene and Early Pliocene. This would have made it possible for Megalodon to live anywhere around the world. As I mentioned climate was thought to be a factor in their extinction. So the world got colder. ;D
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Post by arioch on Jan 9, 2009 1:38:12 GMT
Then why Megalodon get extincted, in your opinion? ;D The answer to your question was in my statement. Read it again. ;D Done, just all that amount of random facts in the first post confused me. Lazy moment. ;D ;D ;D
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Post by [][][]cordylus[][][] on Jan 9, 2009 1:46:18 GMT
And all those sharks are not from the tropics like Megalodon. Do you ever see tropical sharks such as Grey reef sharks and epaulette sharks in the arctic? And pacific sleepers and greenlands are the same thing BTW. ;D CT you have to remember that the oceans were noticeably warmer during the Miocene and Early Pliocene. This would have made it possible for Megalodon to live anywhere around the world. As I mentioned climate was thought to be a factor in their extinction. So the world got colder. ;D So you are saying there were no polar oceans then.
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Post by stoneage on Jan 9, 2009 3:00:05 GMT
;D CT you have to remember that the oceans were noticeably warmer during the Miocene and Early Pliocene. This would have made it possible for Megalodon to live anywhere around the world. As I mentioned climate was thought to be a factor in their extinction. So the world got colder. ;D So you are saying there were no polar oceans then. ;D No there are always polar oceans. Polar oceans are just a place. There are sharks at the poles. I didn't say Megalodon lived there. It was much warmer then. Megalodon teeth have been found in the Netherlands (Holland). ;D
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Post by [][][]cordylus[][][] on Jan 9, 2009 23:15:02 GMT
Yeah, and I can say that holland would have been more near the equator back then ( in a warmer place ), and it would have been suitable for megalodon to live there.
Why do you think they died out then stoneage?
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Post by stoneage on Jan 9, 2009 23:59:24 GMT
Yeah, and I can say that holland would have been more near the equator back then ( in a warmer place ), and it would have been suitable for megalodon to live there. Why do you think they died out then stoneage? ;D Primarily due to climate.It got colder. Megalodons were a warm water species. As more and more water in the polar regions froze sea levels around the world dropped. Sea level dropped 100 meters or more. This made it tough for Megalodon to find warm shallow waters to breed. Also the Isthmus Of Panama closed off cutting off the Atlantic Ocean and Caribbean Seas from the Pacific Ocean. Glaciation and land movement also changed ocean circulation. All this meant Megalodons range became limited. Many Whales and Dolphin also died off. Some Whales did migrate to polar regions where Megalodon couldn't follow. All of this cut back on Megalodons ability to find food. This lead to Megalodons extinction. Whales did not create these conditions. ;D
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