Informations et ressources sur les pollinisateurs

Think honey bees are disappearing? Or that the more hives we have the better? Think again. Here's why they're the bad boys of the bee world, and what we should be focusing on instead. We're destroying our environment at an alarming rate. But it doesn't need to be this way. Our new channel Planet A explores the shift towards an eco-friendly world — and challenges our ideas about what dealing with climate change means. We look at the big and the small: What we can do and how the system needs to change. Every Friday we'll take a truly global look at how to get us out of this mess. #PlanetA​ #Bees #BeeExtinction Read More (Links): Pollinator assessment https://www.ipbes.net/sites/default/files/downloads/pdf/2017_pollination_full_report_book_v12_pages.pdf Wild bees and pollination https://www.fibl.org/fileadmin/documents/shop/1645-wild-bees.pdf Pollination in the almond fields in the US https://www.theguardian.com/environment/2020/jan/07/honeybees-deaths-almonds-hives-aoe Crop production hurt by lack of pollinators https://royalsocietypublishing.org/doi/10.1098/rspb.2020.0922 Wild bee numbers declining https://www.cell.com/one-earth/pdfExtended/S2590-3322(20)30651-5 Honeybees threaten wild bees, preserving both https://www.frontiersin.org/articles/10.3389/fevo.2019.00060/full Reporter: Amanda Coulson-Drasner Video editors: Amanda Coulson-Drasner, Frederik Willmann Supervising editors: Kiyo Dörrer, Joanna Gottschalk

Most flowering plants are more than willing to spread their pollen around. But some flowers hold out for just the right partner. Bumblebees and other buzz pollinators know just how to handle these stubborn flowers. They vibrate the blooms, shaking them until they give up the nutritious pollen. SUBSCRIBE to Deep Look! http://goo.gl/8NwXqt DEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Get a new perspective on our place in the universe and meet extraordinary new friends. Explore big scientific mysteries by going incredibly small. * NEW VIDEOS EVERY OTHER TUESDAY! * In the summertime, the air is thick with the low humming of bees delivering pollen from one flower to the next. If you listen closely, a louder buzz may catch your ear. This sound is the key to a secret stash of pollen that some flowers hide deep within their anthers, the male parts of the plant. Only pollinators that buzz in just the right way can vibrate tiny grains out of minuscule holes at the top of the anthers for a protein-rich snack. The strategy, called buzz-pollination, is risky. But it’s also critical to human agriculture. Tomatoes, potatoes and eggplants need wild populations of buzz pollinators, such as bumblebees, to produce fruit. Honeybees can’t do it. Plants need a way to get the pollen — basically sperm — to the female parts of another flower. Most plants lure animal pollinators to spread these male gametes by producing sugary nectar. The bee laps up the sweet reward, is dusted with pollen and passively delivers it to the next bloom. In contrast, buzz-pollinated flowers encourage bees to eat the pollen directly and hope some grains will make it to another flower. The evolutionary strategy is baffling to scientists. “The flower is almost like playing hard to get,” says Anne Leonard, a biologist at the University of Nevada, Reno who studies buzz pollination. “It’s intriguing because these buzz-pollinated plants ask for a huge energy investment from the bees, but don’t give much back.” --- What is buzz pollination? Most flowering plants use sugary nectar as bait to attract bees and other pollinators, which get coated in pollen along the way. And since bees are messy, they inadvertently scatter some of that pollen onto the female part of the next flower they visit. But some flowers lock their pollen up in their anthers, the male parts of the flower, instead of giving it away freely. The only way for the pollen to escape is through small holes called pores. Some pollinators like bumblebees (but not honeybees) are able to vibrate the flower’s anthers which shakes up the pollen and causes it to spew out of the pores. The bumblebee collects the pollen and uses it as a reliable and protected source of protein. --- What important crops use buzz pollination to make food? The most important crops that use buzz pollination are potatoes, tomatoes, pumpkins, eggplants, cranberries and blueberries --- What animals are capable of buzz pollination? Many types of bees engage in buzz pollination, also called sonication. The most common is probably the bumblebee. Honeybees generally don’t use buzz pollination. ---+ Read the entire article on KQED Science: https://ww2.kqed.org/science/2016/07/19/this-vibrating-bumblebee-unlocks-a-flowers-hidden-treasure/ ---+ For more information: Anne Leonard Lab, University of Nevada, Reno | Department of Biology http://www.anneleonard.com/buzz-pollination/ ---+ More Great Deep Look episodes: These Lizards Have Been Playing Rock-Paper-Scissors for 15 Million Years | Deep Look https://www.youtube.com/watch?v=rafdHxBwIbQ Winter is Coming For These Argentine Ant Invaders | Deep Look https://www.youtube.com/watch?v=boyzWeHdtiI ---+ See some great videos and documentaries from the PBS Digital Studios! It's Okay to Be Smart: Why Don't Other Animals Wear Glasses? https://www.youtube.com/watch?v=LhubEq6W9GE Gross Science: The World's Most Expensive Fungus https://www.youtube.com/watch?v=iV4WHFU2Id8 ---+ Follow KQED Science: KQED Science: http://www.kqed.org/science Tumblr: http://kqedscience.tumblr.com Twitter: https://www.twitter.com/kqedscience ---+ About KQED KQED, an NPR and PBS affiliate in San Francisco, CA, serves Northern California and beyond with a public-supported alternative to commercial TV, Radio and web media. Funding for Deep Look is provided in part by PBS Digital Studios and the John S. and James L. Knight Foundation. Deep Look is a project of KQED Science, which is also supported by HopeLab, the David B. Gold Foundation, the S. D. Bechtel, Jr. Foundation, the Dirk and Charlene Kabcenell Foundation, the Vadasz Family Foundation, the Gordon and Betty Moore Foundation, the Smart Family Foundation and the members of KQED. #deeplook

There's a lot of buzz about honey bees. But what about our valuable (and challenged) native pollinators? Learn how to attract and support them in this interview. Kim Eierman of EcoBeneficial! talks with Heather Holm about her terrific new book: "Pollinators of Native Plants: Attract, Observe and Identify Pollinators and Beneficial Insects with Native Plants."

A female leafcutter bee cuts a leaf piece and flies it back to her nest.

TAKE ACTION to save the Rusty-patched Bumble Bee: http://chn.ge/28QVIZn Everyone has heard about bee declines, but with so much attention focused on domesticated honeybees, someone has to speak up for the 4,000 species of native bees in North America. Natural history photographer Clay Bolt is on a multi-year quest to tell the stories of our native bees, and one elusive species – the Rusty-patched Bumble Bee – has become his ‘white whale.’ Traveling from state to state in search of the Rusty-patched, he meets the scientists and conservationists working tirelessly to preserve it. Clay’s journey finally brings him to Wisconsin, where he comes face to face with his fuzzy quarry and discovers an answer to the question that has been nagging him all along: why save a species? A film by Day's Edge Productions, produced in partnership with the Xerces Society for Invertebrate Conservation and Endangered Species Chocolate. With music by Dan Warren, New West Studios, and Cloud Cult.