fbpx

Schildpad eet plastic omdat het naar eten ruikt

55

 

Schildpadden en andere zeedieren eten plastics die de mens in zee loost. Omdat ze die voor voedsel houden.

Iedereen kent het dramatische beeld: een zeeschildpad die volledig verstrikt is geraakt in plastic. En dat is niet het enige risico van deze vervuiling; schildpadden en andere zeebewoners werken de plastics ook naar binnen. Waarom eten ze die troep?

Een populaire theorie is die van de ‘plastic kwal’: een plastic tasje dat in het water zweeft lijkt op een kwal en dus op een lekker hapje. Dat kan niet de hele waarheid zijn, schrijven Amerikaanse onderzoekers maandag in vakblad Current Biology, want schildpadden consumeren ook plastics die helemaal niet op kwallen of ander eten lijken. Sleutel voor de verklaring ligt in geur.

Een van die onderzoekers is Matthew Savoca, van het Hopkins Marine Station in Californië, die al enkele jaren dit reukspoor volgt. Dat spoor begint bij plankton, het kleine leven in de oceanen dat voor veel zeebewoners een belangrijke voedingsbron is. Plankton laat zich ruiken omdat het bij de spijsvertering bepaalde gassen uitstoot. Die geur wordt door grotere dieren in, op en boven de zee gebruikt om het voedzame plankton op te sporen.

Savoca begon met bekende gegevens van zo’n 65 vogelsoorten (stormvogelachtigen om precies te zijn), waarvan sommige dat geurspoor gebruiken en andere niet. Die eersten bleken veel vaker met plastics in de maag te worden aangetroffen dan de laatsten.

Nu heeft Savoca, met collega’s van verschillende Amerikaanse universiteiten, experimenteel aangetoond dat hetzelfde mechanisme zeeschildpadden opbreekt. In een ruim bassin werden schildpadden samengebracht met echt voedsel, met schoon plastic, en met plastic dat een paar weken in zeewater had gelegen. Voor de duidelijkheid: ze kregen niet de kans die proefstukken naar binnen te werken; de onderzoekers noteerden hoe vaak de schildpadden hun neus boven het water uitstaken. Want dat is een aanwijzing dat ze eetbaars op het spoor zijn.

Dat gebeurde niet met het schone plastics, maar wel met het echte voer (natuurlijk) en met het plastic dat al een tijd in zee had gelegen. Op dat plastic is leven gaan groeien, concluderen de onderzoekers, waardoor het voor schildpadden en andere zeebewoners in geur niet van echt voedsel te onderscheiden is.

Het slechte nieuws is dat je dit niet kunt oplossen: plastic raakt in zeewater onvermijdelijk begroeid, zeggen de biologen. Voorkomen dat plastics in zee belanden, is het enige dat de mens kan doen.

bron: trouw

Share.

About Author

Avatar

55 reacties

  1. Avatar

    I simply want to mention I’m beginner to blogging and truly savored you’re blog site. Very likely I’m going to bookmark your website . You really come with perfect writings. Thank you for sharing with us your web page.

  2. Avatar

    I have learned some new issues from your web page about computers. Another thing I’ve always imagined is that laptop computers have become an item that each house must have for some reasons. They offer convenient ways to organize the home, pay bills, go shopping, study, pay attention to music and in many cases watch television shows. An innovative solution to complete many of these tasks is with a mobile computer. These pcs are mobile ones, small, potent and mobile.

  3. Avatar

    The following time I learn a blog, I hope that it doesnt disappoint me as much as this one. I imply, I do know it was my option to learn, however I truly thought youd have one thing interesting to say. All I hear is a bunch of whining about one thing that you would fix in case you werent too busy in search of attention.

  4. Avatar

    I do agree with all the ideas you’ve introduced on your post. They’re really convincing and will certainly work. Nonetheless, the posts are too quick for starters. May you please extend them a little from next time? Thanks for the post.

  5. Avatar

    Hey! This post couldn’t be written any better! Reading through this post reminds me of my good old room mate! He always kept chatting about this. I will forward this write-up to him. Pretty sure he will have a good read. Thank you for sharing!

  6. Avatar

    Hi! Someone in my Myspace group shared this site with us so I came to give it a look. I’m definitely loving the information. I’m bookmarking and will be tweeting this to my followers! Terrific blog and brilliant design.

  7. Avatar

    Excellent post. I was checking continuously this blog and I am impressed! Extremely helpful info specifically the last part 🙂 I care for such information much. I was seeking this particular information for a very long time. Thank you and best of luck.

  8. Avatar

    I simply want to mention I am just newbie to blogging and site-building and definitely loved this web site. Most likely I’m want to bookmark your site . You surely have excellent article content. Thanks a bunch for sharing your webpage.

  9. Avatar

    I like the helpful information you provide in your articles. I’ll bookmark your weblog and check again here frequently. I am quite sure I will learn many new stuff right here! Good luck for the next!

  10. Avatar

    Normally I don’t read post on blogs, but I would like to say that this write-up very forced me to check out and do it! Your writing taste has been amazed me. Thank you, very great post.

  11. Avatar

    I wish to express my passion for your generosity supporting visitors who must have assistance with the topic. Your real dedication to getting the message all-around was remarkably significant and has all the time empowered associates much like me to attain their targets. Your own helpful guidelines entails this much a person like me and additionally to my peers. Warm regards; from all of us.

  12. Avatar

    I enjoy what you guys are usually up too. This type of clever wor and
    reporting! Keep up the very good works guys I’ve added you guys to my own video.

  13. Avatar

    You made some decent points there. I looked on the net for additional information about the issue and found most people will go along with your views on this site.

  14. Avatar

    Woah! I’m really loving the template/theme of this blog. It’s simple, yet effective. A lot of times it’s very difficult to get that “perfect balance” between superb usability and visual appearance. I must say you’ve done a fantastic job with this. Additionally, the blog loads extremely quick for me on Chrome. Superb Blog!

  15. Avatar

    Can I simply say what a aid to seek out someone who truly is aware of what theyre speaking about on the internet. You definitely know find out how to bring a difficulty to gentle and make it important. Extra people must learn this and understand this side of the story. I cant imagine youre no more fashionable because you undoubtedly have the gift.

  16. Avatar

    Definitely believe that which you said. Your favorite reason seemed to be on the internet the easiest thing to be aware of. I say to you, I definitely get irked while people consider worries that they plainly do not know about. You managed to hit the nail upon the top as well as defined out the whole thing without having side effect , people could take a signal. Will likely be back to get more. Thanks

  17. Avatar

    Hello everyone, it’s my first visit at this website, and piece of writing iss genuinely fruitful designed for me, keep upp posting such articles or reviews.

  18. Avatar

    I simply want to mention I am just very new to blogs and actually enjoyed your blog site. Likely I’m planning to bookmark your blog . You definitely have amazing articles. Many thanks for revealing your blog site.

  19. Avatar

    Youre so cool! I dont suppose Ive read anything similar to this just before. So nice to uncover somebody by original applying for grants this subject. realy thank you for starting this up. this amazing site is one area that is required on the internet, someone after some originality. useful work for bringing a new challenge for the web!

  20. Avatar

    Hello! I loved your article. Keep writing stuff like this one. I’ll return to see more articles like these. It was very creative. TTYL!

  21. Avatar

    Hi there from Texas! I’m bored at work so I decided to check out your site on my free time during lunch break. I love the info you provide here. Anyhow, wonderful post!

  22. Avatar

    Spot on with this write-up, I honestly believe that this site needs much more attention. I’ll probably be returning to read more, thanks for the info.

  23. Avatar

    Hi there! This post could not be written any better! Reading through this article reminds me of my previous roommate! He constantly kept talking about this. I’ll forward this information to him. Pretty sure he will have a very good read. Many thanks for sharing!

  24. Avatar

    Having read this I believed it was very enlightening. I appreciate you finding the time and effort to put this content together. I once again find myself spending way too much time both reading and commenting. But so what, it was still worthwhile.

  25. Avatar

    Having read this I believed it was very enlightening. I appreciate you spending some time and effort to put Casino Online Terpercaya this short article together. I once again find myself spending a significant amount of time both reading and commenting

  26. Avatar

    I enjoy what you guys are up too. This kind of clever work and coverage! Keep up the wonderful works guys I’ve incorporated you guys to blogroll.

  27. Avatar

    When I originally commented I clicked the “Notify me when new comments are added” checkbox and now each time a comment is added I get several e-mails with the same comment. Is there any way you can remove people from that service? Thank you!

  28. Avatar

    May I simply just say what a relief to find someone who truly understands what they’re discussing on the web. You actually understand how to bring an issue to light and make it important. A lot more people really need to look at this and understand this side of your story. I was surprised that you are not more popular since you definitely possess the gift.

  29. Avatar

    Oh my goodness! Awesome article dude! Thank you so much, However I am going through difficulties with your RSS. I don’t understand the reason why I can’t subscribe to it. Is there anybody else having identical RSS issues? Anyone that knows the solution can you kindly respond? Thanks!!

  30. Avatar

    Hi, Neat post. There’s a problem with your web site in internet explorer, could test this¡K IE still is the marketplace leader and a large element of other folks will omit your magnificent writing because of this problem.

  31. Avatar

    Having read this I thought it was rather enlightening. I appreciate you finding the time and energy to put Bola Online this information together. I once again find myself spending a significant amount of time both reading and commenting

Leave A Reply