Тема: Еволюцията действа бързо при видове с малка продължителност на живота

[Админ]

Еволюцията действа бързо при видове с малка продължителност на живота

Специалистите установили, че "старите", адаптирали се вече гупи, имат много по-голям шанс за оцеляване от "новобранците"


Данните от изследване на американски специалисти показват, че риби гупи, пуснати в нови хабитати, се адаптират към средата само за няколко години и развиват черти, които подпомагат оцеляването им, съобщи "Сайънс дейли".

За целите на изследването си специалистите от Калифорнийския университет, САЩ, пренесли 200 гупи от река Яра в Тринидад на две различни места в близката река Деймиър, в която преди това нямало риби от този вид. Част от гупите били пуснати на място без хищници. Останалите трябвало да съжителстват с други риби, за които гупите са предпочитана храна.

Осем години по-късно учените изследвали гупите, за да разберат какви адаптивни промени са настъпили при тях. Изследователите са установили, че женските са променили репродуктивните си способности, за да се приспособят към новата среда. Там, където гупите съжителствали с хищници, женските произвеждали повече ембриони при всеки репродуктивен цикъл. Смисълът на тази промяна е, че в присъствието на хищници женските могат и да не получат втори шанс за възпроизводство.

 Учените са открили също, че в безопасните води женските произвеждали по-малко ембриони, като по този начин изразходвали по-малко ресурси за възпроизводство.

Следващата стъпка на учените била да проверят дали тези промени наистина помагат на новите популации да оцеляват. За целта те уловили още гупи от река Яра и ги пуснали при рибите, които от осем години обитавали река Деймиър.

 Специалистите установили, че "старите", адаптирали се вече гупи, имат много по-голям шанс за оцеляване от "новобранците". Фактът, че само за осем години при рибите са се развили промени, подпомагащи оцеляването им, показва колко бързо действа еволюцията при видове с малка продължителност на живота.

[isaac257]

scott tucker, born in December 1955 is actually a well-known race driver in The usa. He has two daughters, is married and operates dwellings in Kansas City, Aspen, Colorado, Las Vegas and Nevada.   
   
Early on in his profession, he invested in many fields which includes economic answers, real estate, dining amenities, lodging, web technologies, energy and automotive. Throughout his reign as Chairman of Wesfund, a personal business based mostly in The united states, he began his profession in racing.   
   
Scott Tucker was a university student at Kansas State University in Missouri exactly where he had invested his childhood. He was detained on costs for mail fraud and for creating fraudulent critiques about a particular financial institution and in 1991 he was sentenced to 1 12 months in jail.   
   
The Ferrari Challenge   
   
He managed to total an whole time with the Ferrari Challenge in 2006. At the very same location he had his initial race, Homestead-Miami Speedway, he had the third occasion inside the racing profession. His preferred outcome was fifth position in Oregon - Portland Worldwide Raceway. Of 3 races within the Italy World Finals, he was positioned 3rd in 1 of them. In 2007, he finished a Ferrari Challenge time of year for the second time in which he accomplish his first win within the career. This was in California - Infineon Raceway. Ed Zabinski was the co-driver.   
   
When Tucker entered the Ferrari Problem series in 2008, he was a brand new group leader and race driver. He was the driver of six races of 13 which the group entered. Among other successes, he was positioned 1st in two races at Mugello Globe Finals. Additionally, his circuit in racing became bigger when his team entered four races within the Rolex Sporting activities sequence. In 2009, he placed initial in 10 races: by far the most win actually inside the Ferrari Challenge. November of that very same calendar year he acquired qualifying status, planning him for Mugello, Italy races. He clocked an extraordinary pace of 158.416   
   
Scott Tucker arrived back again soon after that very prosperous and commonly mentioned race and received 2nd place at the International Finals in the Ferrari Challenge in Spain. The end of the year will see exciting races at the Globe Finals - F430 where Tucker might be preparing himself and heading all out to acquire one more racing championship. Tucker is simply .7 seconds from Riccardo Ragazzi from Italy, who is the top qualifier in racing.  This will unquestionably be considered a face-off for that sought after title in the Globe Championship.

[tyler877]

Amongst the top quality cars presently readily available, the Mercedes-Benz AMG will be the one that scott tucker loves. The amazing and efficient style and really feel that this fantastic vehicle gives make 1 feel like an excellent star in racing. Anytime people today globally consider vehicles that carry out perfectly, they frequently assume first from the Mercedes-Benz. For those who are looking for probably the most perfect Mercedes, selected by leading racers for instance Scott Tucker amongst other many people, it really is advised that you give some thought to the AMG. 
 
The 4-cam SLS engine is located in the car’s lowest component within the chassis and it assists mostly in dynamics with the automobile. The audio the engine can make when it is actually turned on and throttles is impressive. When it truly is started, it seems like a race car’s motor. The motor also consist of crankcase which has reinforced bearing caps, forged piston and oil pump that gives ideal efficiency. 
 
Scott Tucker, an American racing star, has undoubtedly produced himself famous in the racing market as being a impressive racer and also an upstanding worker. He doesn't merely get in his automobile and drive it. He's entirely involved in many aspects in the whole occasion. The genuinely enjoys and understand his cars and this can be the quantity one cause why he selected the Mercedes-Benz AMG. Tucker is known as a professional in a lot of details in automobiles and particularly an individual who understands when a vehicle offers real effectiveness. Picking this car, he certainly produced the top selection. 
 
The AMG car is known to be the top the area of effectiveness of all types of automobiles. The auto was manufactured from scratch with leading high quality and fantastic efficiency at the forefront of ideas. The craftsmanship with the engine may well be the figuring out factor that persuaded Scott Tucker to select the AMG Mercedes-Benz from all of the many numerous automobiles available. This automobile was developed in Germany where the performance, reliability and high quality of vehicles are their primary issues. No short cuts or price-cutting is involved using the development from the perfect automobiles in the universe. Scott Tucker knows and it is grateful for this truth. 
 
The AMG models frequently possess a way more aggressive look, greater handling and stability, higher efficiency and additional thorough utilization of carbon fiber than their other Mercedes counterparts. These designs are usually by far the most expensive and top carrying out cars inside the Mercedes sequence. This excludes the non-AMG V12 variations that have essentially the most expensive nameplates inside the lineup of Mercedes.

[tyler877]

Among the top quality vehicles presently readily available, the Mercedes-Benz AMG would be the 1 that scott tucker loves. The marvelous and efficient style and feel this great vehicle presents make one really feel like an excellent star in racing. Every time people today worldwide think of vehicles that carry out completely, they commonly feel initial with the Mercedes-Benz. In case you are seeking for the most ideal Mercedes, chosen by leading racers including Scott Tucker amongst other individuals, it is actually suggested that you simply think about the AMG. 
 
The 4-cam SLS engine is situated in the car’s lowest component inside the chassis and it assists largely in dynamics in the automobile. The sound the engine tends to make when it is turned on and throttles is exceptional. When it can be started, it appears like a race car’s motor. The motor also include crankcase which has reinforced bearing caps, forged piston and oil pump that provides ideal performance. 
 
Scott Tucker, an American racing star, has definitely produced himself famous in the racing sector like a exceptional racer along with an upstanding worker. He will not merely get in his car and drive it. He's absolutely involved in quite a few factors with the whole occasion. The actually enjoys and understand his automobiles and this can be the quantity 1 cause why he chose the Mercedes-Benz AMG. Tucker is often a skilled in a lot of points in automobiles and especially a person who knows whenever a vehicle offers genuine efficiency. Picking out this automobile, he undoubtedly made the perfect selection. 
 
The AMG automobile is identified to become the top the location of effectiveness of all kinds of automobiles. The vehicle was manufactured from scratch with leading high quality and fantastic efficiency at the forefront of thoughts. The craftsmanship from the motor may perhaps be the figuring out element that persuaded Scott Tucker to select the AMG Mercedes-Benz from all the a number of unique vehicles out there. This automobile was created in Germany exactly where the efficiency, reliability and top quality of vehicles are their main concerns. No short cuts or price-cutting is involved with the development in the best vehicles in the universe. Scott Tucker knows and it is grateful for this actuality. 
 
The AMG models in most cases have a even more aggressive look, much better managing and stability, higher efficiency and even more comprehensive utilization of carbon fiber than their other Mercedes counterparts. These designs are generally one of the most pricey and top carrying out vehicles in the Mercedes collection. This excludes the non-AMG V12 variations that have essentially the most expensive nameplates within the lineup of Mercedes.

[tyler877]

Among the premium automobiles presently obtainable, the Mercedes-Benz AMG is the 1 that scott tucker enjoys. The superb and efficient design and really feel that this terrific vehicle delivers make one really feel like a super star in racing. Whenever folks globally consider autos that perform completely, they usually feel initial in the Mercedes-Benz. In the event you are looking for by far the most ideal Mercedes, selected by top racers such as Scott Tucker among other consumers, it can be advised that you think about the AMG. 
 
The 4-cam SLS engine is located in the car’s lowest element within the chassis and it helps mainly in dynamics of the car. The sound which the engine helps make when it's turned on and throttles is outstanding. When it truly is started, it sounds like a race car’s motor. The motor also consist of crankcase that has reinforced bearing caps, forged aide along with oil pump that provides optimum efficiency. 
 
Scott Tucker, an American racing star, has undoubtedly produced himself well-known within the racing market as a impressive racer along with an upstanding employee. He will not merely get in his vehicle and generate it. He is entirely involved with several aspects from the entire event. The genuinely enjoys and comprehend his cars and this can be the range 1 reason why he chose the Mercedes-Benz AMG. Tucker is usually a specialist in lots of details in vehicles and particularly an individual who understands whenever a vehicle delivers authentic effectiveness. Deciding on this vehicle, he obviously made the best choice. 
 
The AMG automobile is identified to become the leading the area of efficiency of all types of automobiles. The car was produced from scratch with best good quality and extraordinary performance at the forefront of thoughts. The craftsmanship from the engine may possibly be the determining factor that persuaded Scott Tucker to select the AMG Mercedes-Benz from all the a lot of various vehicles available. This automobile was developed in Germany exactly where the efficiency, dependability and top quality of automobiles are their principal problems. No short cuts or price-cutting is concerned using the creation with the perfect vehicles in the universe. Scott Tucker understands and it is grateful for this truth. 
 
The AMG designs typically possess a way more aggressive look, greater managing and stability, greater efficiency and much more thorough utilization of carbon fiber than their other Mercedes counterparts. These designs are usually the most costly and best executing autos within the Mercedes sequence. This excludes the non-AMG V12 variations that carry one of the most pricey nameplates in the lineup of Mercedes.