Наука и техника

Биологи доказали способность рыб перемещаться по суше

Теорию эволюции жизни на Земле в очередной раз подтвердили австралийские учёные из Университета Южного Уэльса. Они выяснили, что, по крайней мере, одна представительница из 33 семейств рыб является земноводной, т.е. может жить одновременно в воде и на суше. Согласно исследованиям учёных, 130 различных видов рыб могут передвигаться по земле. Это и американский угорь, который может переползать из пруда в пруд, и бычок-буйвол, который меняет водоём при понижении концентрации кислорода в воде. Известен также илистый прыгун, чьё название говорит само за себя. А рыбы семейства собачковых вообще могут лазить по скалам, цепляясь за камни, благодаря наличию чашевидных плавников. Другой вид рыб семейства собачковых живёт на берегу во время отливов рек.
Ранее считалось, что около 400 миллионов лет назад единственный вид рыб вышел на сушу, дав начало происхождению земноводных. Сейчас же научно доказано, что эту унаследованную от общего предка способность сохранили до наших дней представители различных семейств рыб. Чаще всего она встречается в литоральной зоне – прибрежном участке, который переживает сезонные приливы и отливы.
Кроме того, учёные из Университета Макгилл (Канада) поставили эксперимент над рыбами семейства многопёровых. Это семейство африканских рыб более всего напоминает древних земноводных, которые первыми вышли на сушу. Рыбы могут дышать воздухом и «прогуливаться» по земле. Когда в качестве эксперимента мальков многопёровых подержали год без воды, у них стали наблюдаться анатомические изменения – выделилась голова, плавники видоизменились, скелет удлинился и расширился (чтобы увеличить поддержку во время ходьбы).
Ханс Ларсон, заведующий кафедрой макроэволюции Университета Макгилл, рассказал: «Это первый пример, который демонстрирует пластичность развития и эволюционный переход к новым анатомическим характеристикам и поведению, которые в дальнейшем могли быть зафиксированы генетически».

Комментарии

Добавить комментарий
  • I simply wanted to jot down a quick remark so as to thank you for these pleasant instructions you are showing on this website. My time-consuming internet research has now been recognized with reliable details to write about with my friends and family. I ‘d claim that most of us readers are unquestionably endowed to dwell in a remarkable site with many lovely people with helpful strategies. I feel quite fortunate to have seen the website and look forward to tons of more excellent times reading here. Thanks a lot once more for all the details.

  • I enjoy you because of all of your effort on this site. Debby loves participating in internet research and it is easy to understand why. We hear all about the dynamic mode you present sensible guides on this blog and as well increase response from website visitors about this area then our daughter is certainly studying a lot. Have fun with the rest of the year. You are always carrying out a really great job.

  • I and my buddies appeared to be reading the excellent key points found on your site and so immediately I had an awful suspicion I had not thanked the web site owner for those tips. My men happened to be as a consequence joyful to study them and have in effect in reality been loving them. Thanks for getting very helpful as well as for going for this sort of terrific subject areas millions of individuals are really needing to understand about. My personal honest regret for not saying thanks to you sooner.

  • I actually wanted to post a brief comment to be able to thank you for some of the amazing secrets you are posting at this website. My extended internet investigation has at the end of the day been rewarded with wonderful facts and techniques to share with my classmates and friends. I ‘d assume that most of us site visitors actually are unquestionably endowed to exist in a perfect site with very many marvellous professionals with interesting secrets. I feel very much privileged to have seen the website page and look forward to many more exciting times reading here. Thanks a lot once more for all the details.

  • I want to show my admiration for your kindness for women who need help with that question. Your personal dedication to passing the message all over turned out to be extremely useful and have constantly permitted associates like me to achieve their endeavors. Your own important advice indicates so much to me and substantially more to my fellow workers. Thanks a lot; from all of us.

  • Needed to compose you a very small note to finally say thank you again over the great opinions you’ve contributed here. This has been quite shockingly open-handed with you to supply without restraint all some people could possibly have marketed for an electronic book to earn some money for their own end, even more so given that you could have done it in case you wanted. The secrets additionally worked like a fantastic way to understand that other people online have a similar eagerness much like my very own to figure out way more with regards to this condition. I think there are numerous more pleasurable sessions in the future for people who looked over your blog post.

  • I have to show some appreciation to the writer just for bailing me out of this type of problem. Right after browsing throughout the online world and meeting recommendations that were not productive, I figured my entire life was gone. Living without the presence of answers to the issues you have solved by means of your main short post is a crucial case, as well as ones that might have adversely affected my career if I had not encountered your web site. Your own personal mastery and kindness in taking care of everything was tremendous. I’m not sure what I would’ve done if I had not come across such a point like this. I can at this time look forward to my future. Thanks very much for the specialized and effective help. I won’t hesitate to suggest your blog post to anybody who should have support about this subject matter.

  • Thank you so much for giving everyone an extremely nice opportunity to read critical reviews from this website. It really is very brilliant plus packed with amusement for me personally and my office friends to search your blog at a minimum three times weekly to read the latest guides you have got. And definitely, I’m so actually impressed with all the beautiful tips and hints you serve. Certain 3 tips in this article are indeed the most effective we’ve had.

  • I needed to write you this very little observation so as to say thank you again considering the nice tricks you’ve discussed at this time. It is certainly extremely open-handed of people like you to offer extensively all that a number of us could have offered for sale for an e book in making some money for their own end, even more so given that you could possibly have done it in case you wanted. The inspiring ideas as well acted to be the easy way to be aware that the rest have similar keenness really like my own to see good deal more with regards to this issue. I believe there are thousands of more enjoyable opportunities ahead for those who read carefully your website.

  • I’m just writing to make you know what a cool discovery our girl enjoyed studying your web site. She figured out such a lot of issues, most notably what it’s like to have a great coaching nature to let many people effortlessly learn about specified complex issues. You really exceeded visitors’ expected results. I appreciate you for presenting those insightful, safe, edifying and also cool tips about this topic to Janet.

  • Needed to write you that very little remark to finally give many thanks yet again for your magnificent principles you’ve featured above. It was quite incredibly open-handed with you to supply unreservedly all that numerous people could have made available as an e book to get some dough for themselves, even more so given that you could possibly have tried it if you considered necessary. These points additionally worked to become a great way to realize that the rest have similar desire similar to my personal own to understand much more concerning this problem. I think there are lots of more pleasant situations ahead for people who start reading your blog post.

  • My husband and i got absolutely joyful that Michael managed to do his web research through the ideas he discovered using your web site. It’s not at all simplistic just to continually be giving out instructions that others may have been trying to sell. And we all know we now have you to give thanks to because of that. The specific illustrations you’ve made, the easy site navigation, the friendships you make it easier to promote — it’s all fabulous, and it’s facilitating our son in addition to us recognize that the idea is pleasurable, which is exceptionally mandatory. Many thanks for the whole lot!

  • Needed to compose you the very little note to help say thanks the moment again for the incredible methods you have shown on this website. It was certainly surprisingly generous with people like you to provide extensively all a few individuals would’ve distributed as an e-book to help make some bucks for themselves, chiefly considering the fact that you might have tried it in case you wanted. These suggestions also served as a fantastic way to fully grasp that other people online have similar fervor similar to my personal own to learn significantly more pertaining to this problem. I’m certain there are several more pleasurable times ahead for those who view your blog.

  • I have to point out my love for your kind-heartedness for persons that should have help on this situation. Your very own dedication to getting the solution all over came to be surprisingly useful and have truly enabled men and women like me to get to their endeavors. Your entire helpful guide entails this much to me and a whole lot more to my peers. Regards; from all of us.