Tell-Tale Leech Meals скачать в хорошем качестве

Tell-Tale Leech Meals

On a recent expedition to the lush forests of Cambodia, a team of Museum researchers experimented with a new method of tracking endangered animals. But first, they had to bare their arms and legs and attract bloodsucking leeches. #leeches #Cambodia #expeditions #dna Follow the 2015 Constantine S. Niarchos Expedition to Cambodia, as trio of scientists trek through the forests of Cambodia in search of Haemadipsida—a family of jawed, terrestrial jungle leeches that feed on the blood of mammals. While the main purpose of the trip was to document leech biodiversity in Southeast Asia, the expedition was designed to sample “bycatch” as well—namely, DNA from the blood of these leeches mammalian meals, which can be preserved in a leeches’ gut for months. Back at the Museum, that DNA was sequenced and fed into a database that identifies biological sequences. Matching these strings of sequenced DNA to existing samples let researchers identify which animals the leeches were feeding on—other than humans, whose status as a leech meal the whole team could attest to. These “IDNA” tests provide conservation biologists with a valuable snapshot of species living in a specific area. Tracking elusive, endangered mammals in their native habitats can be difficult and time-consuming work involving the use of sophisticated technology like radio tagging and camera traps. However in recent years, the IDNA method of sequencing the contents of leeches’ stomachs has provided a faster, less expensive alternative to other methods of mammal-spotting. “What we're able to do is go in, go to a forest just for a day, collect leeches off the ground, collect them off of ourselves, sequence the DNA from their gut contents, and use that DNA to figure out what mammals are in an area, very efficiently.” said expedition member Michael Tessler, a Ph.D.-degree student at the Museum’s Richard Gilder Graduate School. Data from Tessler’s labwork on the DNA gathered from leech guts will form the basis of his dissertation. The results of the Niarchos expedition to Cambodia could also help conservation biologists refine the leech gut IDNA method by setting benchmarks for the number of leech species and number of individual leeches to collect when using the method in a given area. PHOTOGRAPHY: Flickr Commons/ Christina Gallivan, Allan Hopkins, Charles J. Sharp, Tortan Travel, Ken Wong MUSIC: “Mekong Delta” by Tim Butcher/Warner Chappell Production Music “Truth Development Inc” by Lars Kurz/Warner Chappell Production Music The Constantine S. Niarchos Expedition was generously supported by the Stavros Niarchos Foundation. This video and all media incorporated herein (including text, images, and audio) are the property of the American Museum of Natural History or its licensors, all rights reserved. The Museum has made this video available for your personal, educational use. You may not use this video, or any part of it, for commercial purposes, nor may you reproduce, distribute, publish, prepare derivative works from, or publicly display it without the prior written consent of the Museum. © American Museum of Natural History, New York, NY