Once upon a time, 450 million years ago, scavenger fish without teeth or bones roamed the shallow icy waters of Africa which was undergoing an Ice Age. Slowly, over millions of years, they gained teeth and other structures characteristic of more advanced fish. Then, a few thousand years ago, a lake in the (now continental Africa) dried up, and its cichlid-fish inhabitants underwent an explosive burst of speciation. That’s the gist of two stories, one from BBC News and one from National Geographic. The fossil fish story in BBC News emphasizes the claim that this is a “missing link” three times. Professor Richard Aldridge (U. of Leicester) is quoted as saying:“The fossil record confirms that the evolution of fish was a step-wise event,” explained Professor Aldridge. “The various characters that make up a fish, or a vertebrate, didn’t all appear at once – they were added one by one through evolutionary time. These [new] fossils help fill in this pattern of how early vertebrate evolution began.” (Emphasis added in all quotes.)One problem is noted: “These fossils are important because there is a theory that the origins of fish really took place in the northern continents, and then spread south,” he said. “This find [from Southern Africa] dispels that theory.” How fish got to China 80 million years earlier he does not explain. The cichlid fish inhabiting east African lakes today are another matter. In just a few thousand years, according to National Geographic, these freshwater fish “have evolved an astonishing array of forms in Africa.” The high rates of speciation among these fish is “almost beyond belief,” yielding up to 400 species. Evolution apparently has a variable speed control. “The discovery should provide valuable new insights into the march of evolution, which, in the case of cichlids, seems to favor the fast-forward button.”If evolution had a fast-forward button, it would be an intelligently designed machine. These two articles illustrate the extreme flexibility of evolutionary logic, where any data point, no matter how anomalous, can be fit into the tall tale somehow. Contradictions, rather than being disturbing, make the plot thicker and more interesting. Somehow, in an early world with a plethora of unfilled ecological niches, fish took their time evolving over tens of millions of years. Then in a relatively small lake habitat on one continent, Tinkerbell hit the fast-forward button and generated hundreds of species of fish in a geological instant. Evolution marches on.(Visited 13 times, 1 visits today)FacebookTwitterPinterestSave分享0
Share Facebook Twitter Google + LinkedIn Pinterest As the newly planted corn and soybean fields begin to emerge, pests become a major concern for farmers. In this week’s DuPont Pioneer Field Report, Account Manager Trent Brisby tells Ty Higgins that he is getting reports of pests damaging the young crops in Northwest Ohio. He has some tips on what to look for and what to do to protect fields this season and beyond.
Share Facebook Twitter Google + LinkedIn Pinterest The latest edition of Shop Talk with Fennig Equipment joins Adam Fennig to discuss some options to consider when thinking about cover crop application and/or termination.
A Web Developer’s New Best Friend is the AI Wai… 8 Best WordPress Hosting Solutions on the Market Tags:#start#StartUp 101#startups Related Posts One of the fantastic things about being an entrepreneur is that you can define your own working conditions. From Craigslist’s modest Sunset District apartment headquarters to Twitter’s stylish new digs, startups are getting creative with their work spaces. Below are a few options to consider in choosing your space. Virtual: As covered in an earlier post, ReadWriteWeb runs a totally virtual office. Using a combination of Basecamp, Google Docs and Skype, the team manages to coordinate articles and interviews from more than five locations across the globe. Traveling Space: We recently came across iStopOver – a service that allows you to rent space for your team while on the go. If you’re together at a conference, or you’d just like a change of pace, this service allows you to rent furnished office space on a daily basis. Why Tech Companies Need Simpler Terms of Servic… Top Reasons to Go With Managed WordPress Hosting dana oshiro Co-working: Rather than having your staff work in isolation, you can rent them desk space at one or a number of distributed co-working facilities. Sites like San Francisco’s Citizen Space and The Hat Factory allow nomadic tech workers to share ideas and solutions in a friendly environment. Many co-working spaces offer a daily drop in rate as well as the option for monthly membership. To find a space in your community, check out the co-working map on the Co-working community blog. Lease and Rent: Sites like LoopNet and Rofo specialize in finding commercial space. A number of sites will allow you to take on space for a short-term lease with the idea that you may need to scale up your team in a short period of time. If you’ve got a unique work environment, let us know in the comments below.
Two-wheeler manufacturer Hero MotoCorp Ltd has recently launched its sporty motorcycle ‘Ignitor’at 15 dealerships across Karnataka. The bike is priced at Rs 56,747 (base variant ex-showroom Bangalore), the company said in a statement.The Hero Ignitor is offered in two variants, with the base variant getting front drum brake and the top variant getting front disc brake, it said.Ignitor is available in four exciting colours, Panther Black, Sports Red, Pearl White, & Vibrant Blue, the company said.The other features of Ignitor are: digital analog combo meter console, stylish split seat, classy cowl, striking trapezoidal headlight, dazzling tail light, adjustable rear shock-absorbers, body-coloured rear grip and dual tone rear view mirrors. The Ignitor is powered by a 125cc Ecno-Power with low friction technology engine that delivers 11 bhp of power at 8000rpm, promising both fuel economy along with a good power and pick up, the company said.”We aim to bolster our presence in the growing deluxe segment. It combines sturdiness and superior technology,” said Ani Dua, senior Vice-President (Marketing and Sales), Hero Moto Corp.With PTI inputs