first_imgDNA, Fish, Genetics, Invertebrates, Monitoring, Oceans, Technology, Wildtech Article published by Sue Palminteri Popular in the CommunitySponsoredSponsoredOrangutan found tortured and decapitated prompts Indonesia probeEMGIES17 Jan, 2018We will never know the full extent of what this poor Orangutan went through before he died, the same must be done to this evil perpetrator(s) they don’t deserve the air that they breathe this has truly upset me and I wonder for the future for these wonderful creatures. So called ‘Mankind’ has a lot to answer for we are the only ones ruining this world I prefer animals to humans any day of the week.What makes community ecotourism succeed? In Madagascar, location, location, locationScissors1dOther countries should also learn and try to incorporateWhy you should care about the current wave of mass extinctions (commentary)Processor1 DecAfter all, there is no infinite anything in the whole galaxy!Infinite stupidity, right here on earth.The wildlife trade threatens people and animals alike (commentary)Anchor3dUnfortunately I feel The Chinese have no compassion for any living animal. They are a cruel country that as we knowneatbeverything that moves and do not humanily kill these poor animals and insects. They have no health and safety on their markets and they then contract these diseases. Maybe its karma maybe they should look at the way they live and stop using animals for all there so called remedies. DisgustingConservationists welcome China’s wildlife trade banThobolo27 JanChina has consistently been the worlds worst, “ Face of Evil “ in regards our planets flora and fauna survival. In some ways, this is nature trying to fight back. This ban is great, but the rest of the world just cannot allow it to be temporary, because history has demonstrated that once this coronavirus passes, they will in all likelihood, simply revert to been the planets worst Ecco Terrorists. Let’s simply not allow this to happen! How and why they have been able to degrade this planets iconic species, rape the planets rivers, oceans and forests, with apparent impunity, is just mind boggling! Please no more.Probing rural poachers in Africa: Why do they poach?Carrot3dOne day I feel like animals will be more scarce, and I agree with one of my friends, they said that poaching will take over the world, but I also hope notUpset about Amazon fires last year? Focus on deforestation this year (commentary)Bullhorn4dLies and more leisSponsoredSponsoredCoke is again the biggest culprit behind plastic waste in the PhilippinesGrapes7 NovOnce again the article blames companies for the actions of individuals. It is individuals that buy these products, it is individuals that dispose of them improperly. If we want to change it, we have to change, not just create bad guys to blame.Brazilian response to Bolsonaro policies and Amazon fires growsCar4 SepThank you for this excellent report. I feel overwhelmed by the ecocidal intent of the Bolsonaro government in the name of ‘developing’ their ‘God-given’ resources.U.S. allocates first of $30M in grants for forest conservation in SumatraPlanet4dcarrot hella thick ;)Melting Arctic sea ice may be altering winds, weather at equator: studyleftylarry30 JanThe Arctic sea ice seems to be recovering this winter as per the last 10-12 years, good news.Malaysia has the world’s highest deforestation rate, reveals Google forest mapBone27 Sep, 2018Who you’re trying to fool with selective data revelation?You can’t hide the truth if you show historical deforestation for all countries, especially in Europe from 1800s to this day. WorldBank has a good wholesome data on this.Mass tree planting along India’s Cauvery River has scientists worriedSurendra Nekkanti23 JanHi Mongabay. Good effort trying to be objective in this article. I would like to give a constructive feedback which could help in clearing things up.1. It is mentioned that planting trees in village common lands will have negative affects socially and ecologically. There is no need to even have to agree or disagree with it, because, you also mentioned the fact that Cauvery Calling aims to plant trees only in the private lands of the farmers. So, plantation in the common lands doesn’t come into the picture.2.I don’t see that the ecologists are totally against this project, but just they they have some concerns, mainly in terms of what species of trees will be planted. And because there was no direct communication between the ecologists and Isha Foundation, it was not possible for them to address the concerns. As you seem to have spoken with an Isha spokesperson, if you could connect the concerned parties, it would be great, because I see that the ecologists are genuinely interested in making sure things are done the right way.May we all come together and make things happen.Rare Amazon bush dogs caught on camera in BoliviaCarrot1 Feba very good iniciative to be fallowed by the ranchers all overSponsoredcenter_img All organisms shed traces of their biological material, which contains their unique DNA, into the environment. Researchers using a technique called metabarcoding to sequence this environmental DNA (eDNA) in water can detect the presence of multiple taxa in a single sample.eDNA surveillance is already being used as a tool for detecting invasive species and confirming the presence of endangered or cryptic organisms in an area, thereby influencing management decisions.Recent studies suggest that eDNA metabarcoding has the potential to support conservation efforts as a biodiversity monitoring tool in the marine environment.eDNA metabarcoding of water samples has proven to be an effective, non-invasive survey technique that allows researchers to assess the biodiversity of an aquatic environment in a fraction of the time that traditional manual survey methods require. The Census of Marine Life (CoML), a 10-year international effort to determine the diversity of life found in Earth’s oceans, described over 1 million species, ranging from single-celled microbes to marine mammals the size of school buses. Understanding what species are present in our oceans, how abundant they are and how they are distributed is essential for developing effective conservation strategies. However, the vastness and complexity of the marine environment, coupled with this abundance of unique species, makes accurate and efficient monitoring of biodiversity a challenge.Structure supports marine communities. Photo credit: Sue PalminteriThe development of remote-sensing satellite technologies has revolutionized the collection of physiochemical ocean properties, such as temperature and wave-height. But, until recently, the collection of biological data has relied on labor-intensive survey methods that identify organisms based on morphological traits (shape, size, color etc.). Emerging technology based on the detection of environmental DNA (eDNA) may soon change that.Environmental DNA (eDNA)As organisms interact with their environment, they inevitably shed traces of biological material (skin, scales, feces, gametes, etc.) that contains their unique DNA. Since plant DNA was first detected in soil in 1998, eDNA from both plants and animals has been successfully isolated from samples collected in a variety of terrestrial and aquatic ecosystems. Traditionally, researchers have analyzed these samples using probes designed to detect the presence of a specific species in a process called DNA barcoding. This process is equivalent to that of a grocery store cashier who scans the barcode sticker on a costumer’s apple to determine its variety.Marine researchers have used eDNA barcoding to confirm the presence of rare or cryptic organisms and to facilitate early detection of invasive species and harmful algal blooms. In addition, as highlighted in a recent Wildtech article, the Barcode of Wildlife Project (BWP) uses DNA barcoding to provide evidence in cases of poaching and illegal wildlife trade.What’s down there? If it’s the Indo-Pacific, it could be a reef-dwelling devil scorpionfish. Photo credit: George PowellHowever, many important management and policy decisions depend on knowing the full suite of species present in a given area and their abundances. An emerging technology called eDNA metabarcoding may be able to provide that valuable information. Two recent studies have assessed the effectiveness of this biodiversity monitoring tool that has the potential to revolutionize how we are able to study the ocean and other ecosystems.What is eDNA metabarcoding?Although every individual organism contains a unique genetic code within their DNA, there are some areas of the DNA sequence, called “barcodes,” that are not only shared by individuals within the same species, but also across broader taxonomic groups. For example, the mitochondrial gene cytochrome c oxidase 1 (CO1) plays an essential role in energy production and is therefore highly conserved and found in almost all organisms.In contrast to DNA barcoding, the process of metabarcoding is equivalent to the grocery cashier scanning and determining the variety of all of a customer’s produce, at the same time.  Probes called primers are used to extract a specific barcode, such as CO1, from the DNA found in an environmental sample. A highly efficient process called high-throughput sequencing is able to rapidly determine the sequences of these barcodes and, by matching them to a reference database, researchers are able to determine which taxa are present.Extracted DNA being prepared for sequencing. Photo credit: Col Ford and Natasha de VereThe effectiveness of this technique lies in these special primers. While primers designed to sequence the CO1 barcode are highly effective at detecting eukaryotic DNA, more sensitive primers can be designed if researchers are interested in targeting a more specific taxonomic group with higher resolution. For example, in 2015 MiFish primers were developed for the universal detection of fish species. In a controlled aquarium experiment, eDNA metabarcoding using these primers successfully detected 168 out of 180 taxonomically diverse fish species.eDNA metabarcoding as a biodiversity monitoring toolA recent study in Scientific Reports compared the effectiveness of eDNA metabarcoding using MiFish primers to traditional underwater visual surveying. The researchers tested the new technique in the species-rich Maizuru Bay, in the Sea of Japan, where over 80 species of fish had been detected from 140 underwater visual surveys conducted over 14 years. Using eDNA metabarcoding in the same bay, researchers detected the presence of 112 species of fish from water samples. Satoshi Yamamoto and co-authors suggest that “this efficiency is potentially important, particularly in species-rich waters, because a greater effort is required to investigate the whole fish community as the number of species in the community increases.”Maizuru Bay, Sea of Japan. Photo credit: Miyabi.SHN- Creative CommonsNot only was the eDNA metabarcoding technique more time-efficient and sensitive, but researchers detected the presence of 23 species that were not observed during the visual surveys. It is likely that some of these species were present in larval form – too small to be observed visually – or are well camouflaged.  In addition, by sampling across a grid, the researchers were able to assess the utility of eDNA metabarcoding to estimate the spatial structure of the fish community. Most species were detected in their expected habitats, suggesting that the fish eDNA was not being transported far from its source organism.A similar study recently published in Frontiers in Marine Science, also found that eDNA metabarcoding detected a broader range of animal taxa in seagrass habitats in Puget Sound, Washington, USA than did field surveys carried out using a manual-tow net. Using primers that targeted three different barcodes, University of Washington’s Ryan Kelly and colleagues sequenced eDNA from seawater samples and identified 366 taxonomic families, including various barnacles, snails, crabs, fish and seals. In contrast, the 12 manual tows conducted at the same locations identified just 45 distinct animal taxa (in 32 different families).Graceful Kelp Crab (Pugettia gracilis) in an eelgrass bed, Puget Sound, Washington. Photo credit: NOAAAnalyses using the three different barcode regions and the manual tows also identified different taxa. “Our data suggest that different primer sets reveal different draws from a common pool of species represented in the sampled bottle of water,” the researchers concluded, adding.They added, “These results highlight the value of using multiple methods in ecological surveys, given that any one sampling method—even eDNA, which can reveal hundreds of taxa present at a location— unavoidably reflects only a small fraction of the true biological diversity present in the environment.”Puget Sound Eelgrass habitat. Photo credit: ColleenO’BrienWhen feasible, they suggested, it helps to use complementary data types to assess biodiversity. “One advantage of using multiple data types is the ability to see deeper into an ecosystem than would otherwise be possible, each providing a new window into a complex living world.”Pros and cons of eDNA metabarcodingMetabarcoding of aquatic environmental DNA has proven to be a sensitive, non-invasive survey technique that allows researchers to assess the biodiversity of a given area in a fraction of the time that traditional survey methods require. Unlike terrestrial ecosystems, where eDNA has been shown to persist for years, aquatic ecosystems facilitate the rapid breakdown of eDNA. This reduces long-distance dispersal, giving researchers a more accurate snapshot of the species present and their spatial distribution.In an e-mail to Wildtech, Kelly highlighted the pros of eDNA metabarcoding as “greatly increased sensitivity (ability to detect species when they are present) and coverage (number of species detected), as well as the ability to add more samples without greatly increasing cost.” Kelly also suggested, “There have now been dozens of validation studies in seawater, rivers, lakes, soil, air, etc. So it’s clear that this is a technique that is valuable and informative. But understanding the spatial and temporal resolution of eDNA surveys in each of these contexts is important, as is working to make the technique more quantitative.”Monitoring an area’s biodiversity is essential for informing management and policy decisions; however, having some knowledge of species abundance is also often necessary. As Kelly suggests, compared to traditional survey methods, eDNA metabarcoding is still lacking in this quantitative aspect: “more DNA = more of a species, but we can’t say that 100 eDNA reads = 1 dolphin, for example,” he wrote.Quantifying abundance of different fish species is still a challenge for environmental DNA. How many glass minnows do you see? Photo credit: Sue PalminteriKelly identified “the trade-off between how many species you’d like to detect and how much detail you would like to get about any particular species. So if you’re interested in the [genetic] diversity of a population of a single species, you can design eDNA probes that target that particular species (excluding all other species)…. Alternatively, if you want to survey a whole community (many species), you will lose information about diversity within populations of a particular species.”Another potential drawback of eDNA barcoding highlighted by Kelly is that “it takes specialized training (not everyone is a molecular biologist with access to a lab).” Fortunately, increased interest in genetic research over the past decade has led to the development of technology that has significantly reduced the cost of sequencing. Ten years ago, it would have cost around $500 to obtain approximately 2000 DNA barcode sequences, as opposed to just $0.01 in 2017.Reference databases (e.g. Genbank) used to match DNA sequences to species still use centuries of knowledge gained from visual identification. According to Kelly, “we very much rely on the natural history information — and the taxonomic expertise — of those ecologists that are in the field using traditional methods. I can’t imagine replacing that. But for applications where we can’t afford to pay people to do such labor-intensive sampling, some degree of automation makes sense, and eDNA might provide that.”Perils of marine field work — a very friendly / scary wolf eel, resident of Puget Sound, Washington state, USA. Photo credit: DanHershman-Creative Commons, FlickrThe future of eDNA metabarcodingHow long will it be until eDNA metabarcoding becomes an established and reliable method used to inform management and conservation policies? Perhaps not long. Environmental DNA surveillance has already proven to be a useful tool for detecting invasive and endangered species, thereby influencing management decisions. According to Kelly, “I think it’s just a matter of matching the questions that state/federal agencies are actually asking with the technology useful for answering those questions. Which is a process, but it’s already started. I get phone calls all the time from agencies asking how they can start using eDNA.”CitationsKelly RP, Closek CJ, O’Donnell JL, Kralj JE, Shelton AO and Samhouri JF (2017) Genetic and Manual Survey Methods Yield Different and Complementary Views of an Ecosystem. Frontiers in Marine Science. 3:283. doi: 10.3389/fmars.2016.00283Yamamoto, S. et al. (2017) Environmental DNA metabarcoding reveals local fish communities in a species-rich coastal sea. Scientific Reports. 7:40368. doi: 10.1038/srep40368last_img