Welcome to my Metazoic site! This site discusses the existence of the creatures to come along after humans will be extinct. I first became interested in a world after man when I acquired my first copy of Dougal Dixon's After Man: A Zoology of the Future in 1992. However, I unwittingly created creatures that did not exist from the time I was about 8 years old. But it was after I obtained a copy of that book (now a collector's item) that I decided to take these same creatures I created as a child and make them more realistic in an evolutionary sense. Though it may be hard for a lot of us to grasp, humans will soon become extinct. One of the biggest factors of how this will happen is the current overpopulation rate. Which is why I don't contribute to the population. I created this world with little more than mammals fulfilling all ecological niches with the help of some friends. I even gave the era of the age after man a name, I called it the Metazoic, derived from the words for "After-era" (Meta, meaning after, and zoic meaning era). We are now in the Cenozoic era. To view all the animals I have created since I began this project, you can go to the "Meet the Mammals" section of this site. To discuss your own ideas about what you think will happen in the future world, and share your ideas with others, please feel free to leave a comment.
One more thing, some of you may find this site quite offensive, and you have a right to your own opinion. But please respect my right to have an opinion too. I'm not saying there is no GOD, I believe it was HIM who got the ball rolling. But I believe after that, evolution took over. There is so much more evidence of evolution than there is of creation. Even that going on right under our noses. Other than that, enjoy yourself and visit our many links.
Tuesday, February 17, 2009
The One-Two Punch of Extinctions
Mass Extinctions May Follow One-Two Punch
Michael Reilly, Discovery News
Feb. 17, 2009 -- As agents of extinction, comet and asteroid impacts may be losing their punch.
According to a new theory about how mass dyings work, cosmic collisions generally aren't enough to cause a major extinction event. To be truly devastating, they must be accompanied by another event that inflicts long-term suffering, like runaway climate change due to massive volcanic eruptions.
In other words, a comet couldn't have killed the dinosaurs by itself -- unless they were already endangered species.
This kind of one-two punch could explain more than the extinction of dinosaurs, Nan Arens of Hobart and William Smith Colleges said. In a recent paper in the journal Paleobiology, she and colleague Ian West argue that there are two types of events that can cause extinctions -- "pulses" (quick, deadly shocks, like comets) and "presses" (drawn-out stresses that push ecosystems to the brink but may not kill outright, like million-year-long volcanic eruptions).
The chances of mass dyings go way up when both happen together, argues Arens.
But are all mass extinctions created equal? Can researchers come up with a "Grand Unified Theory" of ancient apocalypse?
West and Arens think so. They combed the last 300 million years of geologic record, noting impact craters, massive eruptions, periods of ancient climate change, and then comparing them to extinctions. The rate at which species die off spiked dramatically, they found, when a "pulse"-type event occurred within a million years or so of a "press."
The theory fits well for the dinosaurs. Around the time of their demise 65 million years ago, a comet slammed into the Yucatan Peninsula and a huge volcano, the Deccan Traps, was erupting in what is today India.
But other extinctions are problematic. The greatest dying in geologic history, the Permian-Triassic extinction, killed 90 percent of all life on Earth, but there is no record of an impact. Instead, all signs point to a 200,000-year-long volcanic eruption in Siberia as the murder weapon.
Arens' theory argues that impacts are weaker in effect than is generally thought. But a growing consensus of researchers believes that doesn't go far enough. They believe eruptions, not cosmic impacts, are the real killers.
"I'm not so sure craters really have anything to do with it," Gregory Retallack of the University of Oregon said, adding: "I don't like the 'press' term very much. If you look closely at the isotope record, you can see that flood basalts [large-scale eruptions] are a series of pulses, paving the golden path toward annihilation."
"I'm not saying it's impossible to have an extinction with just a 'press' or a 'pulse' event," Arens admitted. The study states only that it's more likely when the two combine.
Humanity is creating exactly that scenario today, she said. Over the last 6,000 years, subsistence farming began changing the climate and clearing wilderness slowly enough to constitute 'press'-type stresses on the environment. But people began burning fossil fuels in earnest during the Industrial Revolution, and carbon concentrations have skyrocketed while growing population numbers have led to widespread habitat loss around the globe.
Arens argued this constitutes a 'pulse' event, and the sixth great mass extinction may already be underway.
Sorry if it feels like you're out of the loop again Metazoica, but this is something that paleontologists have known about for quite some time. Dinosaur diversity was decreased during the Maastrictian, the period right before the mass extinction. This was probably due to the Deccan traps, volcanic fields in India which caused the extinction of many dinosaur species, some of which could have survived the impact if they had not gone extinct beforehand (Oryctodromeus, for one). If the impact had not occured, it seems fairly likely that we would still be living on a dinosaur-dominated planet today. However, as we all know, the meteor came crashing down out of the sky and became the "straw that broke the camel's back", so to speak.
LOL! Well, it's not the first time. It's no problem, Metalraptor. I just find these articles. This one was dated today. So I cannot really guarantee the "freshness" of these articles.
We don't know for sure if diversity among Mesozoic animals was in decline toward the end of Maastrichian, the best fossil sites we have for that time period are the Lance/Hell creek formations and...that is it basically.
You are right about that. But it appears dinosaur diversity was going down slightly between the Maastrictian and Campanian. However, when one thinks about it, it could be due to a change in climate due to the fluctuation of the seaway. The problem is we need more K-T boundary sites in order to prove it one way or the other.
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