Invasive alien species (IAS) have always raised interest, not only because of their distinctive characteristics of wide distribution and life cycles, but also because of their ability for adaptation, establishment and expansion in a new environment, which allow them to become successful invaders. Invasive species and populations pose major threats to biodiversity, ecosystem integrity, agriculture, fisheries, and public health. One of the characteristics of IAS is that they are easily adaptable to new habitats, thus allowing them to increase their population size and geographic distribution rapidly. Environmental damage and disturbances caused by invasive species represent significant economic costs for various activities, also involving health risk situations [ 1 ]. Certainly, they are the main cause of extinction, retraction and restructuration of biological populations [2- 4].
After an introduction, different events of the colonization process will determine that only a limited number of species will be established as successful colonizers [ 5 , 6 ]. Although most introductions fail at this stage, species that successfully adapt to the new environment may become highly invasive, achieving a rapid expansion. Usually, the expansion of the invasion has important evolutionary biology and genetic consequences that are transferred from one place to another, and that could influence the probability of establishment, the future distribution and the adaptability of the invasive species. If the adaptive response occurs in the short-term, these cases become true natural experiments, which are very useful for the study of ecological and evolutionary biology responses. By contrast, genetic evolutionary invasions have remained relatively unexplored probably by the early dissociation between studies on the ecology of invasions and studies related to genetics and evolution of introduced non-native species. In the last few years, DNA-based methods were developed for the detection, identification and monitoring of invasive species [ 7 ] and for the analysis of the variability and genetic structure of populations (e.g. [ 8 - 11 ]), to apply these results to the knowledge to management, control and/or eradication of invasive species. These advances led to the increased use of genetic markers in the development of evolutionary and molecular ecology and concentrated large investigations on genetic variability of invasive species, consolidated the importance of evolutionary genetic aspects in invasive processes.
Studies on invasive genetics have increased gradually, with the aim of identifying the determinants of invasiveness and the traits that characterize IAS using genetic markers to phylogenetic and phylogeographic analyses, and other experimental approaches, which include historical, biogeographical, and ecosystem factors. Certainly, invasion genetics is a tool for reconstructing the biogeographic and evolutionary history of invasions, evaluating among other things, the magnitude of genetic bottlenecks and founding events. Both evolutionary processes can drastically reduce genetic variability (gene drift), and consequently it is expected that introduced species might have limited potential to adapt to new environments.
The genetic approach provides a way to solve the genetic paradox of biological invasion, i.e. “how introduced populations, whose genetic variation has been depressed by a genetic bottleneck or founding effect, persist and adapt to new conditions” [ 12 ]. Despite this, the adaptive potential of some invasive species might be significant.
Although both phenotypic plasticity and epigenetic variation have also been proposed as compensatory for this lack of genetic variation [ 13 ], many invasive species may have being benefited from repeated introductions, increasing genetic variation into the new habitat. For example, one factor that contributes to the adaptive potential of introduced species and that could contribute to the invasion success is the intraspecific hybridization (admixture) produced by multiple introductions from different native populations into one area [ 12 , 14 - 16 ]. In addition, some invasive populations showed greater genetic diversity when compared to native populations [ 17 , 18 ].
It is important to note that there are increasingly more studies reporting evolutionary changes in invasive populations at ecological times, such as the case of copepods adapted to different salinities [ 13 , 19 ], Drosophila [ 20 ], rabbits [ 21 ] and Solidago [ 22 ].
One of the key factors in the invasion genetics is that if we want to study adaptation of introduced species to new environments, we have to stop using neutral markers and begin determining how particular gene variation influences the introduction and successful expansion of species.
Recent advances in molecular tools will undoubtedly provide great contributions to genetic studies. Particularly, there are several new technologies for the analysis of genetic variability in invasive species that use a variety of molecular markers. For example, DNA barcoding [ 23 ] will enable rapid identification of invasive species, allowing quarantine and eradication efforts to begin far earlier, with significant reductions in costs and increased chances of success.
Also, the Metabarcoding or Environmental DNA (eDNA) are surveillance tools used to monitor for the genetic presence of a species in a variety of environmental samples that have many potentially invasive species, the presence of the targeted invasive species can be confirmed through the direct detection of its DNA. The increased sensitivity of this technique could be a valuable tool not only for invasive species but also for threatened and endangered species as well. Furthermore, early detection by Metabarcoding can significantly reduce costs in managing the invasive species.
Genomics is an extremely powerful tool for reconstructing the evolutionary history of invasive species [ 24 ] and enables scientists to differentiate between neutral (i.e. those changes in which natural selection does not affect their spread in a species) and positive DNA changes (i.e. those that improve chances of survival and reproduction of an organism and thus spread through a population). This positively selected evolution drives the fast adaptation of invasive species. Consequently, by understanding the effects of positive evolution we can predict how species could be able to adapt in the future.
Invasion genetics is slowly proceeding to invasion genomics. Both disciplines provide a cost-effective solution to the monitoring and management of invasive species. Therefore, studies using these new technologies will be key for analyzing the functional role of candidate loci and will represent a step forward for invasion genetics.
The remarkable increase in research on biological invasions in Latin America in the last decades is to integrate invasive genetics with other approaches, such as demographic and ecological [ 25 ]. Although there are very few studies in Argentina that integrate genetic and ecological data of invasive alien species, which therefore represent a new field to explore. It should be noted that so far in our country, no management or eradication plans have employed eDNA or genetic/genomic information.
2. GENETIC STUDIES OF INVASIVE MAMMALS INTRODUCED IN ARGENTINA
In Argentina there are more than 600 alien or non-native species (http://www.institutohorus.org.br/iabin/i3n/), of which approximately 149 are wildlife (animal) species. In particular, during the last decades, the introduction and effects of several species of non-native wild mammals have been documented. However, the existing information on these species is limited, even of those invasive mammal species that cause innumerable inconveniences and disturbances in diverse ecosystems of our country [ 26 ].
Beaver invasion is certainly one of the most complex topics regarding invasive mammals in Argentina, and a molecular biology approach would allow integrating different strategies to ensure a successful management program of this invasive mammal. Beavers were introduced on the Isla Grande de Tierra del Fuego and are responsible for the most drastic landscape alteration since the last glacial age, affecting not only the hydrology and composition of the southern beech forest but also and more importantly, allowing other exotic species to invade the ecosystem. From 20 individuals intentionally released in 1946 [ 38 ],
Table 1. Molecular technology applied to genetic studies of invasive mammalian species introduced in Argentina.
aLocus: RAG1, recombination activating gene 1; D-loop, the control region of mitochondrial DNA; COI, mitochondrial cytochrome oxidase c subunit I gene; Cyt b, mitochondrial cytochrome b gene. bGenBank accession numbers. cAccession numbers in Barcode Index (BOLD). dGenBank accession number in progress. eNo data available.
beavers have increased their numbers to a current population size of approximately 100,000 or more individuals. Our studies analyzing the genetic variability and population structure of mitochondrial DNA of this species in the archipelago of Tierra del Fuego showed the presence of seven linages, three of them that proved to be the most abundant and distributed throughout the archipelago [ 29 - 31 ] (Figure 1). We concluded that the main island (Isla Grande) should be considered a single management unit (MU) and every small island in the archipelago a separate MU. We also proposed control and management measures considering that it was not possible to identify eradication units (EU) clearly in Isla Grande, given that the Strait of Magellan is the only geographic barrier that would prevent gene flow in the population. This scenario makes difficult to decide whether eradicating, controlling or even tolerating the species is the most convenient strategy.
The genetic characterization of asiatic species of Callosciurus squirrels (C. finlaysonii and C. erythraeus) introduced into Argentina was also studied by [ 32 ] to compare them with native and introduced populations into Asia. The genetic variation in mitochondrial and nuclear DNA markers between the four invasion foci in Argentina was analyzed to corroborate the pathway of invasion. Sequences from Asiatic squirrels introduced into Argentina were related to Callosciurus finlaysonii according to D-loop and Cytochrome b mitochondrial markers (Figure 1). Additionally, introduced squirrels from the different invasion foci formed a monophyletic group that, together with one haplotype for the D-loop and COI (Cytochrome c oxidase subunit I) markers supported the hypothesis of one single introduction event into Argentina followed by subsequent translocations. The phylogeny of C. erythraeus and C. finlaysonii and their different subspecies is not yet resolved, since intraspecific variation among sequences of Callosciurus belonging to different subspecies or collected from different regions is large and comparable with the distance to the sequences from Argentina. Reference [ 32 ] finally concluded that the genetic and intraspecific variations between Callosciurus species require further research, in order to obtain a more comprehensive phylogeny. This demonstrates the need for applying genetic studies to get a clear understanding of the parental origin of introduced populations and an updated review of their phylogenies.
Rabbits (Oryctolagus cuniculus) is another mammal species that invaded Argentina throughout the continental and insular Patagonia (Tierra del Fuego). A genetic study of Patagonian populations  determined the main existing lineages and the genealogical relationship between rabbit populations introduced in Argentina and their original distributions (Figure 1). It is undoubtedly that there is still much to investigate in relation to intra and inter-population genetic variability of this species and its implication in the identification of management units and implementation of control actions.
Large hairy armadillo Chaetophractus villosus is a particular case of invasive species because it is native to continental region of Argentina however it was introduced by humans in the Isla Grande de Tierra del Fuego in 1982 [ 37 , 41 ]. All armadillos from Patagonia and Tierra del Fuego belong to the same mitochondrial linage (Figure 1). Recent monitoring of populations of this species in Isla Grande shows that their distribution range has increased since its introduction (Poljak et al., unpublished).
3. MANAGEMENT AND GENETIC CONTROL OF INVASIVE SPECIES
Certainly, it is important to discuss the implications on the incorporation of evolutionary genetics to determine the success of the invasion and consequently, its usefulness for the management and genetic control of IAS. In particular, knowledge about genetic structure of invasive species is extremely informative to generate mitigation and management strategies. Moreover, comparing genetic variation within and between invasive populations enables biologists to understand how invading species spread, intermingle and compete with native species. Basically, elucidate the genetic consequences of introductions is essential aspect for the effective management of invasive species and for sustainable policy decisions.
At present, molecular techniques enhance management of invasive species, they are faster, more specific and have greater standardization than surveillance programs based on morphological identification [ 42 ]. Biologists use molecular techniques to catch invasions earlier by detecting animals’ DNA in the environment (eDNA) from skin, urine, faeces, air, sediment, soil or water samples and is an indirect genetic method for detection of rare and cryptic species [ 43 ]. In addition, markers such as microsatellites, nuclear and mitochondrial DNA have been widely used to understand population dynamics of different pests and disease vectors, helping control programs to limit their impact, as in the case of some mammal species [ 9 , 29 , 30 , 32 , 44 - 47 ].
Also genetic control strategies, which involve genetic engineering, are area-wide and species-specific methods. This species-specific aspect is very attractive from an environmental perspective, as it targets the species of interest [ 48 ]. The most common management genetic-based strategy for population suppression that uses classical genetics for biological insect control is the Sterile Insect Technique (SIT) [ 49 ]. This technique has been used successfully for more than 50 years against several major agricultural pests, using radiation-sterilized insects. In Argentina, this technique has been employed mainly in agricultural regions where insects cause large losses in fruit and vegetable production.
More recently, Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)-Cas9 is a novel technology of great potential for controlling invasive species and its development has resumed discussions on the use of gene drive for invasive species control [ 50 ]. Once transgenic organisms bearing the gene drive are constructed in the laboratory, they must be released into the wild to mate with wild-type individuals, in order to begin the process of spreading the drive to wild populations. This technology can be applied for controlling or even eradicating invasive species from islands or even possibly from entire continents, but this can also have risks related to undesired spread. Firstly, rare mating events may allow the drive to affect closely related species and secondly, this could spread from the invasive population back into the native habitat. Because this technology involves transgenic organisms, experiments are not completely without risk.
Much remains to be done in terms of genetic control using modified organisms, so we believe that making a consultative and regulated risk-cost-benefit analysis in a biosecurity context might be a careful step forward before the use of gene drive technologies in invasive species populations.
Therefore, researchers, policymakers, and resource managers must carefully evaluate implementation risks of molecular genetic technologies that could threaten rather than assist a given ecosystem [ 51 ]. Definitely, understanding these interactions has broad practical application for the control and management of invasive species.
According to the current situation, we consider it would be useful to detect the population structure of invasive species introduced in Argentina through analysis of mitochondrial and nuclear DNA, as well as environmental DNA. In this way, genetic information can be applied in conjunction with traditional eradication and control measures in order to management invasive species. It is also extremely important to inform and encourage education of researchers, policymakers, resource managers and people in general, in order to avoid new introductions of exotic species.
In other words, genomic tools are extremely useful for the management and control of IAS. Although they may be considered too expensive for the resources allocated to natural resource offices or government administrations, several studies (see above) have shown that they are actually much more effective than traditional monitoring tools.
Despite the considerable number of mammal species introduced in Argentina [ 26 , 27 , 52 ], no genetic studies have been carried out for almost any of these species, not even descriptive studies suggesting the need to relate ecological aspects and population genetics. There is still much to be known about the adaptations of invasive species to the new environments in which they inhabit and about the potential of many other species that are not yet invasive. Without doubt, the early detection of potentially invasive species, after their introduction, when populations are still limited to a small area and a low density, maximizes the probability of effective management [ 53 ].
Actually, the knowledge about molecular data to understand invasive species dispersal and adaptation has valuable applications mainly when these aspects are urgently required. We believe that the extensive experience of regulatory successes and failures in the context of classical biological control offers a framework to provide meaningful guidance for assessing risks and benefits for applications related to invasive species control within this emerging field.
Basically, new genomic tools provide an unprecedented view of past and present population processes and add much more than simply improving the detection and understanding of the expansion. High-density markers are used to detect changes in different parts of the genome, processes of hybridization and introgression, and adaptation to the climate change. An increase in the rate of biological invasions directly related to the increase in climate change effects is expected on biological communities, particularly when events of habitat disturbances that facilitate the establishment of IAS occur [ 54 ].
Invasion biology has recognized that the direction of research is clearly changing [ 55 ]. Although most studies hitherto are purely ecological (at the level of organisms, species, populations, or ecosystems), we need to recognize the usefulness and increasing growth of genetic studies and the significance of evolutionary processes in invasive species for generating management actions and controlling the impact of biological invasions. More recently, there has been a resurgence of interest in this subject. Indeed, the significance of the genetic approach and the evolutionary perspective is now globally recognized as important not only for understanding the species’ ability to move forward through different stages of the invasion but also for improving management interventions that could reduce rates and impacts of invasions.
Countless genomic tools can be used to allow society to reduce the economic cost of biological invasions by optimizing their management and control. To mitigate these costs, it is necessary to better understand the causes, consequences and progression of the invasion. Consequently, the genetic information will serve to identify and predict the risk of the source populations and address the problem when possible invasions are detected.
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