Environmental DNA

Environmental DNA or eDNA is DNA that is collected from a variety of environmental samples such as soil, seawater, snow or even air [2] rather than directly sampled from an individual organism. As various organisms interact with the environment, DNA is expelled and accumulates in their surroundings. Example sources of eDNA include, but are not limited to, feces, mucus, gametes, shed skin, carcasses and hair.[3] Such samples can be analyzed by high-throughput DNA sequencing methods, known as metagenomics, metabarcoding, and single-species detection,[4] for rapid monitoring and measurement of biodiversity. In order to better differentiate between organisms within a sample, DNA metabarcoding is used in which the sample is analyzed and uses previously studied DNA libraries, such as BLAST, to determine what organisms are present.[5]

The longhorn beetle, Leptura quadrifasciata, is an example of a flower‐visiting insect found in a study which showed that that environmental DNA (eDNA) from arthropods are deposited on wild flowers after interactions [1]
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eDNA metabarcoding is a novel method of assessing biodiversity wherein samples are taken from the environment via water, sediment or air from which DNA is extracted, and then amplified using general or universal primers in polymerase chain reaction and sequenced using next-generation sequencing to generate thousands to millions of reads. From this data, species presence can be determined, and overall biodiversity assessed. It is an interdisciplinary method that brings together traditional field-based ecology with in-depth molecular methods and advanced computational tools.[6]

The analysis of eDNA has great potential, not only for monitoring common species, but to genetically detect and identify other extant species that could influence conservation efforts.[7] This method allows for biomonitoring without requiring collection of the living organism, creating the ability to study organisms that are invasive, elusive, or endangered without introducing anthropogenic stress on the organism. Access to this genetic information makes a critical contribution to the understanding of population size, species distribution, and population dynamics for species not well documented. The integrity of eDNA samples is dependent upon its preservation within the environment.

Soil, permafrost, freshwater and seawater are well-studied macro environments from which eDNA samples have been extracted, each of which include many more conditioned subenvironments.[8] Because of its versatility, eDNA is applied in many subenvironments such as freshwater sampling, seawater sampling, terrestrial soil sampling (tundra permafrost), aquatic soil sampling (river, lake, pond, and ocean sediment),[9] or other environments where normal sampling procedures can become problematic.[8]

Overview

Environmental DNA or eDNA describes the genetic material present in environmental samples such as sediment, water, and air, including whole cells, extracellular DNA and potentially whole organisms.[10][11] eDNA can be captured from environmental samples and preserved, extracted, amplified, sequenced, and categorized based on its sequence.[12] From this information, detection and classification of species is possible. eDNA may come from skin, mucous, saliva, sperm, secretions, eggs, feces, urine, blood, roots, leaves, fruit, pollen, and rotting bodies of larger organisms, while microorganisms may be obtained in their entirety.[13][14][11] eDNA production is dependent on biomass, age and feeding activity of the organism as well as physiology, life history, and space use.[11][15][16][6]

Global ecosystem and biodiversity monitoring
with environmental DNA metabarcoding [6]

Despite being a relatively new method of surveying, eDNA has already proven to have enormous potential in biological monitoring. Conventional methods for surveying richness and abundance are limited by taxonomic identification, may cause disturbance or destruction of habitat, and may rely on methods in which it is difficult to detect small or elusive species, thus making estimates for entire communities impossible. eDNA can complement these methods by targeting different species, sampling greater diversity, and increasing taxonomic resolution.[17] Additionally, eDNA is capable of detecting rare species, but not of determining population quality information such as sex ratios and body conditions, so it is ideal for supplementing traditional studies.[15][17] Regardless, it has useful applications in detecting the first occurrences of invasive species, the continued presence of native species thought to be extinct or otherwise threatened, and other elusive species occurring in low densities that would be difficult to detect by traditional means.[6]

Degradation of eDNA in the environment limits the scope of eDNA studies, as often only small segments of genetic material remain, particularly in warm, tropical regions. Additionally, the varying lengths of time to degradation based on environmental conditions and the potential of DNA to travel throughout media such as water can affect inference of fine-scale spatiotemporal trends of species and communities.[18][13][19][15][17][16] Despite these drawbacks, eDNA still has the potential to determine relative or rank abundance as some studies have found it to correspond with biomass, though the variation inherent in environmental samples makes it difficult to quantify.[14][11] While eDNA has numerous applications in conservation, monitoring, and ecosystem assessment, as well as others yet to be described, the highly variable concentrations of eDNA and potential heterogeneity through the water body makes it essential that the procedure is optimized, ideally with a pilot study for each new application to ensure that the sampling design is appropriate to detect the target.[20][15][17][6]

While the definition of eDNA seems straightforward, the lines between different forms of DNA become blurred, particularly in comparison to community DNA, which is described as bulk organismal samples.[17] A question arises regarding whole microorganisms captured in eDNA samples: do these organisms alter the classification of the sample to a community DNA sample? Additionally, the classification of genetic material from feces is problematic and often referred to as eDNA.[17] Differentiation between the two is important as community DNA indicates organismal presence at a particular time and place, while eDNA may have come from a different location, from predator feces, or from past presence, however this differentiation is often impossible.[21][17] However, eDNA can be loosely classified as including many sectors of DNA biodiversity research, including fecal analysis and bulk samples when they are applicable to biodiversity research and ecosystem analysis.[6]

eDNA metabarcoding
Applications of environmental DNA metabarcoding in aquatic and terrestrial ecosystems [6]

By 2019 methods in eDNA research had been expanded to be able to assess whole communities from a single sample. This process involves metabarcoding, which can be precisely defined as the use of general or universal polymerase chain reaction (PCR) primers on mixed DNA samples from any origin followed by high-throughput next-generation sequencing (NGS) to determine the species composition of the sample. This method has been common in microbiology for years, but is only just finding its footing in assessment of macroorganisms.[18][21][17] Ecosystem-wide applications of eDNA metabarcoding have the potential to not only describe communities and biodiversity, but also to detect interactions and functional ecology over large spatial scales, though it may be limited by false readings due to contamination or other errors.[14][22][21][16] Altogether, eDNA metabarcoding increases speed, accuracy, and identification over traditional barcoding and decreases cost, but needs to be standardized and unified, integrating taxonomy and molecular methods for full ecological study.[18][23][24][25][16][6]

eDNA metabarcoding has applications to diversity monitoring across all habitats and taxonomic groups, ancient ecosystem reconstruction, plant-pollinator interactions, diet analysis, invasive species detection, pollution responses, and air quality monitoring. eDNA metabarcoding is a unique method still in development and will likely remain in flux for some time as technology advances and procedures become standardized. However, as metabarcoding is optimized and its use becomes more widespread, it is likely to become an essential tool for ecological monitoring and global conservation study.[6]

Extracellular and relic DNA
Relic DNA dynamics [26]

Extracellular DNA, sometimes called relic DNA, is DNA from dead microbes. Naked extracellular DNA (eDNA), most of it released by cell death, is nearly ubiquitous in the environment. Its concentration in soil may be as high as 2 μg/L, and its concentration in natural aquatic environments may be as high at 88 μg/L.[27] Various possible functions have been proposed for eDNA: it may be involved in horizontal gene transfer;[28] it may provide nutrients;[29] and it may act as a buffer to recruit or titrate ions or antibiotics.[30] Extracellular DNA acts as a functional extracellular matrix component in the biofilms of several bacterial species. It may act as a recognition factor to regulate the attachment and dispersal of specific cell types in the biofilm;[31] it may contribute to biofilm formation;[32] and it may contribute to the biofilm's physical strength and resistance to biological stress.[33]

Under the name of environmental DNA, eDNA has seen increased use in the natural sciences as a survey tool for ecology, monitoring the movements and presence of species in water, air, or on land, and assessing an area's biodiversity.[34][35]

In the diagram on the right, the amount of relic DNA in a microbial environment is determined by inputs associated with the mortality of viable individuals with intact DNA and by losses associated with the degradation of relic DNA. If the diversity of sequences contained in the relic DNA pool is sufficiently different from that in the intact DNA pool, then relic DNA may bias estimates of microbial biodiversity (as indicated by different colored boxes) when sampling from the total (intact + relic) DNA pool.[26]

Collection
Subglacial aquatic sediment continuous coring
The cylindrical platform can pass through the access borehole and penetrate the sediment. The lead ropes link between the surface winch and the underwater platform and the cable-suspended corer can repeatedly penetrate the same sediment borehole guided by the lead ropes.[36]

Terrestrial sediments

The importance of eDNA analysis stemmed from the recognition of the limitations presented by culture-based studies.[7] Organisms have adapted to thrive in the specific conditions of their natural environments. Although scientists work to mimic these environments, many microbial organisms can not be removed and cultured in a laboratory setting.[8] The earliest version of this analysis began with ribosomal RNA (rRNA) in microbes to better understand microbes that live in hostile environments.[37] The genetic makeup of some microbes is then only accessible through eDNA analysis. Analytical techniques of eDNA were first applied to terrestrial sediments yielding DNA from both extinct and extant mammals, birds, insects and plants.[38] Samples extracted from these terrestrial sediments are commonly referenced as 'sedimentary ancient DNA' (sedaDNA or dirtDNA).[39] The eDNA analysis can also be used to study current forest communities including everything from birds and mammals to fungi and worms.[8]

Aquatic sediments

The sedaDNA was subsequently used to study ancient animal diversity and verified using known fossil records in aquatic sediments.[8] The aquatic sediments are deprived of oxygen and are thus protect the DNA from degrading.[8] Other than ancient studies, this approach can be used to understand current animal diversity with relatively high sensitivity. While typical water samples can have the DNA degrade relatively quickly, the aquatic sediment samples can have useful DNA two months after the species was present.[40] One problem with aquatic sediments is that it is unknown where the organism deposited the eDNA as it could have moved in the water column.

Aquatic (water column)

Studying eDNA in the water column can indicate the community composition of a body of water. Before eDNA, the main ways to study open water diversity was to use fishing and trapping, which requires resources such as funding and skilled labour, whereas eDNA only needs samples of water.[9] This method is effective as pH of the water does not affect the DNA as much as previously thought, and sensitivity can be increased relatively easily.[9][41] Sensitivity is how likely the DNA marker will be present in the sampled water, and can be increased simply by taking more samples, having bigger samples, and increasing PCR.[41] eDNA degrades relatively fast in the water column, which is very beneficial in short term conservation studies such as identifying what species are present.[8]

Researchers at the Experimental Lakes Area in Ontario, Canada and McGill University have found that eDNA distribution reflects lake stratification.[42] As seasons and water temperature change, water density also changes such that it forms distinct layers in small boreal lakes in the summer and winter. These layers mix during the spring and fall.[43] Fish habitat use correlates to stratification (e.g. a cold-water fish like lake trout will stay in cold water) and so does eDNA distribution, as these researchers found.[42]

Schematic of a drilling vessel recovering a sediment core for sedaDNA analysis and hypothetical past marine community composition. Schematic not to scale. [44]
Schematic of different methodological approaches in modern and ancient marine genomics. (a) Metabarcoding is the amplification and analysis of equally sized DNA fragments from a total DNA extract. (b) Metagenomics is the extraction, amplification, and analysis of all DNA fragments independent of size. (c) Target-capture describes the enrichment and analysis of specific (chosen) DNA fragments independent of size from a total DNA extract.[44]

In the diagram above on the left, the pink dashed line indicates the use of a chemical tracer for contamination tracking during coring. The white dashed line depicts the sediment core. Small yellow circles indicate theoretical sedaDNA sampling intervals, corresponding to pie charts on the right. Pie charts represent hypothetical paleo-communities detectable from sedaDNA shotgun analysis, where the majority (~75%) of the recovered sedaDNA sequences originate from bacteria, and where sedaDNA from fossilizing/cyst-forming taxa increases relative to non-fossilizing/non-cyst-forming taxa with subseafloor depth (assuming that sedaDNA of fossilizing/cyst-forming taxa preserves better than that of non-fossilizing/non-cyst-forming taxa). The decreasing size of the pie charts with subseafloor depth indicates an expected decrease in sedaDNA.[44]

Monitoring species

eDNA can be used to monitor species throughout the year and can be very useful in conservation monitoring.[45][46] eDNA analysis has been successful at identifying many different taxa from aquatic plants,[47] fishes,[46] mussels,[45] fungi [48][49] and even parasites.[50][37] eDNA has been used to study species while minimizing any stress inducing human interaction, allowing researchers to monitor species presence at larger spatial scales more efficiently.[51][52] The most prevalent use in current research is using eDNA to study the locations of species at risk, invasive species, and keystone species across all environments.[51] eDNA is especially useful for studying species with small populations because eDNA is sensitive enough to confirm the presence of a species with relatively little effort to collect data which can often be done with a soil sample or water sample.[7][51] eDNA relies on the efficiency of genomic sequencing and analysis as well as the survey methods used which continue to become more efficient and cheaper.[53] Some studies have shown that eDNA sampled from stream and inshore environment decayed to undetectable level at within about 48 hours.[54][55]

Environmental DNA can be applied as a tool to detect low abundance organisms in both active and passive forms. Active eDNA surveys target individual species or groups of taxa for detection by using highly sensitive species-specific quantitative real-time PCR [56] or digital droplet PCR markers.[57] CRISPR-Cas methodology has also been applied to the detection of single species from eDNA;[58] utilising the Cas12a enzyme and allowing greater specificity when detecting sympatric taxa. Passive eDNA surveys employ massively-parallel DNA sequencing to amplify all eDNA molecules in a sample with no a priori target in mind providing blanket DNA evidence of biotic community composition.[59]

Managing fisheries
Overfishing the Canadian northern cod fishery resulted in catastrophic collapse [60]
In this example, a fish leaves eDNA behind in a trail as it moves through the water, but the trail dissipates slowly over time

The successful management of commercial fisheries relies on standardised surveys to estimate the quantity and distribution of fish stocks. Atlantic cod (Gadus morhua) is an iconic example that demonstrates how poorly constrained data and uninformed decision making can result in catastrophic stock decline and ensuing economic and social problems.[61] Traditional stock assessments of demersal fish species have relied primarily on trawl surveys, which have provided a valuable stream of information to decision makers.[62] However, there are some notable drawbacks of demersal trawl surveys including cost,[63] gear selectivity/catchability,[64] habitat destruction[65] and restricted coverage (e.g. hard-substrate bottom environments, marine protected areas).[66]

Environmental DNA (eDNA) has emerged as a potentially powerful alternative for studying ecosystem dynamics. The constant loss and shedding of genetic material from macroorganisms imparts a molecular footprint in environmental samples that can be analysed to determine either the presence of specific target species [67][68] or characterise biodiversity.[69][70] The combination of next generation sequencing and eDNA sampling has been successfully applied in aquatic systems to document spatial and temporal patterns in the diversity of fish fauna.[71][72][73][74] To further develop the utility of eDNA for fisheries management, understanding the ability of eDNA quantities to reflect fish biomass in the ocean is an important next step.[66]

Positive relationships between eDNA quantities and fish biomass and abundance have been demonstrated in experimental systems.[75][76][77] However, known variations between eDNA production [78][79] and degradation [80][81][82][83] rates is anticipated to complicate these relationships in natural systems. Furthermore, in oceanic systems, large habitat volumes and strong currents are likely to result in physical dispersal of DNA fragments away from target organisms.[84] These confounding factors have been previously considered to restrict the application of quantitative eDNA monitoring in oceanic settings.[85][66]

Despite these potential constraints, numerous studies in marine environments have found positive relationships between eDNA quantities and complimentary survey efforts including radio-tagging,[86] visual surveys,[74][87] echo-sounding [88] and trawl surveys.[73][89] However, studies that quantify target eDNA concentrations of commercial fish species with standardised trawl surveys in marine environments are much scarcer.[89] In this context, direct comparisons of eDNA concentrations with biomass and stock assessment metrics, such as catch per unit effort (CPUE), are necessary to understand the applicability of eDNA monitoring to contribute to fisheries management efforts.[66]

Decline of terrestrial arthropods
Differentiation of arthropod communities by plant species
Bipartite plot for the COI gene. The figure shows from which plants each arthropod family is obtained from. Plant names: Angeli (Angelica archangelica), Centau (Centaurea jacea), Daucus (Daucus carota), Echium (Echium vulgare), Eupato (Eupatorium cannabinum), Solida (Solidago canadensis), Tanace (Tanacetum vulgare).[1]
          Transect samples collected with 10 m distance between each

Terrestrial arthropods are experiencing massive decline in Europe as well as globally,[90][91][92][93] although only a fraction of the species have been assessed and the majority of insects are still undescribed to science.[94] As one example, grassland ecosystems are home to diverse taxonomic and functional groups of terrestrial arthropods, such as pollinators, phytophagous insects, and predators, that use nectar and pollen for food sources, and stem and leaf tissue for food and development. These communities harbor endangered species, since many habitats have disappeared or are under significant threat.[95][96] Therefore, extensive efforts are being conducted in order to restore European grassland ecosystems and conserve biodiversity.[97] For instance, pollinators like bees and butterflies represent an important ecological group that has undergone severe decline in Europe, indicating a dramatic loss of grassland biodiversity.[98][99][100][101] The vast majority of flowering plants are pollinated by insects and other animals both in temperate regions and the tropics.[102] The majority of insect species are herbivores feeding on different parts of plants, and most of these are specialists, relying on one or a few plant species as their main food resource.[103] However, given the gap in knowledge on existing insect species, and the fact that most species are still undescribed, it is clear that for the majority of plant species in the world, there is limited knowledge about the arthropod communities they harbor and interact with.[1]

Terrestrial arthropod communities have traditionally been collected and studied using methods, such as Malaise traps and pitfall traps, which are very effective but somewhat cumbersome and potentially invasive methods. In some instances, these techniques fall short of performing efficient and standardized surveys, due to, for example, phenotypic plasticity, closely related species, and difficulties in identifying juvenile stages. Furthermore, morphological identification depends directly on taxonomic expertise, which is in decline.[104][105][106] All such limitations of traditional biodiversity monitoring have created a demand for alternative approaches. Meanwhile, the advance in DNA sequencing technologies continuously provides new means of obtaining biological data.[107][108][109][110] Hence, several new molecular approaches have recently been suggested for obtaining fast and efficient data on arthropod communities and their interactions through non‐invasive genetic techniques. This includes extracting DNA from sources such as bulk samples or insect soups,[111][112][113][114] empty leaf mines,[115] spider webs,[116] pitcher plant fluid,[117] environmental samples like soil and water (environmental DNA [eDNA]),[118][119][120][121] host plant and predatory diet identification from insect DNA extracts,[122][123] and predator scat from bats.[124][125] Recently, also DNA from pollen attached to insects has been used for retrieving information on plant–pollinator interactions.[126][127] Many of such recent studies rely on DNA metabarcoding—high‐throughput sequencing of PCR amplicons using generic primers.[128][129][1]

Deep sea sediments
OTU (operational taxonomic unit) network of the extracellular DNA pools from the sediments of the different continental margins.[130]

Extracellular DNA in surface deep-sea sediments is by far the largest reservoir of DNA of the world oceans.[131] The main sources of extracellular DNA in such ecosystems are represented by in situ DNA release from dead benthic organisms, and/or other processes including cell lysis due to viral infection, cellular exudation and excretion from viable cells, virus decomposition, and allochtonous inputs from the water column.[131][132][133][134] Previous studies provided evidence that an important fraction of extracellular DNA can escape degradation processes, remaining preserved in the sediments.[135][136] This DNA represents, potentially, a genetic repository that records biological processes occurring over time.[137][138][130]

Recent investigations revealed that DNA preserved in marine sediments is characterized by a large number of highly diverse gene sequences.[137][138][139][140][141] In particular, extracellular DNA has been used to reconstruct past prokaryotic and eukaryotic diversity in benthic ecosystems characterized by low temperatures and/or permanently anoxic conditions.[141][142][143][144][145][130]

The diagram on the right shows the OTU (operational taxonomic unit) network of the extracellular DNA pools from the sediments of the different continental margins. The dot size within the network is proportional to the abundance of sequences for each OTU. Dots circled in red represent extracellular core OTUs, dot circled in yellow are partially shared (among two or more pools) OTUs, dots circled in black are OTUs exclusive of each pool. The core OTUs contributing at least for 20 sequences are shown. The numbers in parentheses represent the number of connections among OTUs and samples: 1 for exclusive OTUs, 2–3 for partially shared OTUs and 4 for core OTUs.[130]

Previous studies suggested that the preservation of DNA might be also favoured in benthic systems characterised by high organic matter inputs and sedimentation rates, such as continental margins,[146][147]. These systems, which represent ca. 15% of the global seafloor, are also hotspots of benthic prokaryotic diversity,[148][149][150] and therefore they could represent optimal sites to investigate the prokaryotic diversity preserved within extracellular DNA.[130]

Spatial distribution of prokaryotic diversity has been intensively studied in benthic deep-sea ecosystems [151][152][153][154] through the analysis of "environmental DNA" (i.e., the genetic material obtained directly from environmental samples without any obvious signs of biological source material).[155] However, the extent to which gene sequences contained within extracellular DNA can alter the estimates of the diversity of the present-day prokaryotic assemblages is unknown.[156][130]

Snow tracks

Wildlife researchers in snowy areas also use snow samples to gather and extract genetic information about species of interest. DNA from snow track samples has been used to confirm the presence of such elusive and rare species as polar bears, arctic fox, lynx, wolverines, and fishers.[157][158][159][160]

Canada lynx
Tracks of a Canada lynx in snow

See also

References
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