Detecting the True Extent of Introgression during Anthropogenic Hybridization

McFarlane, S. Eryn; Pemberton, Josephine M.

doi:10.1016/j.tree.2018.12.013

Cited by 114 publications

(192 citation statements)

References 81 publications

(124 reference statements)

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“…Hybridisation among species which are naturally separated is undoubtedly increasing due to anthropogenic impacts, including species' invasions (McFarlane & Pemberton ). Extensive introgression from invading populations can put already endangered native populations at risk (Senn et al ).…”

Section: Negative Impactsmentioning

confidence: 99%

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Genetic tools in the management of invasive mammals: recent trends and future perspectives

2020

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Invasive non‐native species are now considered to be one of the greatest threats to biodiversity worldwide. Therefore, efficient and cost‐effective management of species invasions requires robust knowledge of their demography, ecology and impacts, and genetic‐based techniques are becoming more widely adopted in acquiring such knowledge. We focus on the use of genetic tools in the applied management of mammalian invasions globally, as well as on their inherent advantages and disadvantages. We cover tools that are used in: 1) detecting and monitoring mammalian invaders; 2) identifying origins and invasive pathways; 3) assessing and quantifying the negative impacts of invaders; and 4) population management and potential eradication of invasive mammals. We highlight changes in sequencing technologies, including how the use of techniques such as Sanger sequencing and microsatellite genotyping, for monitoring and tracing invasive pathways respectively, are now giving way to the use of high‐throughput sequencing methods. These include the emergence of environmental DNA (eDNA) metabarcoding for the early detection of invasive mammals, and single nucleotide polymorphisms or whole genomes to trace the sources of invasive populations. We are now moving towards trials of genome‐editing techniques and gene drives to control or eradicate invasive rodents. Genetic tools can provide vital information that may not be accessible with non‐genetic methods, for the implementation of conservation policies (e.g. early detection using systematic eDNA surveillance, the identification of novel pathogens). However, the lack of clear communication of novel genetic methods and results (including transparency and reproducibility) to relevant stakeholders can be prohibitive in translating these findings to appropriate management actions. Geneticists should engage early with stakeholders to co‐design experiments in relation to management goals for invasive mammals.

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Section: Negative Impactsmentioning

confidence: 99%

“…Scandura et al ). While microsatellite markers can be informative in detecting first‐generation or second‐generation hybridisation events, their low coverage means that they cannot detect extensive backcrossing over several generations between parental species (McFarlane & Pemberton ).…”

Section: Negative Impactsmentioning

confidence: 99%

Genetic tools in the management of invasive mammals: recent trends and future perspectives

2020

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Section: Introductionmentioning

confidence: 99%

“…Understanding the evolutionary consequences of voluntary or involuntary anthropogenic hybridization is of major concern for conservation biology (Allendorf, ; McFarlane & Pemberton, ; Waples, ). Indeed, anthropogenic hybridization may affect fitness components (survival, growth and reproduction), which may in turn impact population dynamics, genetic diversity and long‐term viability (e.g., Allendorf, Hohenlohe, & Luikart, ; McFarlane & Pemberton, ). However, the consequences of induced gene flow between foreign and local populations are not well understood and have been considered as potentially either beneficial or harmful to the local populations, depending on the context (e.g., McFarlane & Pemberton, ; Todesco et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, anthropogenic hybridization may affect fitness components (survival, growth and reproduction), which may in turn impact population dynamics, genetic diversity and long‐term viability (e.g., Allendorf, Hohenlohe, & Luikart, ; McFarlane & Pemberton, ). However, the consequences of induced gene flow between foreign and local populations are not well understood and have been considered as potentially either beneficial or harmful to the local populations, depending on the context (e.g., McFarlane & Pemberton, ; Todesco et al, ). On the positive side, the introduction of foreign individuals may be used to rescue endangered, inbred populations (i.e., genetic rescue) with the goal of increasing the mean fitness of individuals in the local population (Frankham, ; Harris, Zhang, & Nielsen, ).…”

Section: Introductionmentioning

confidence: 99%

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The role of recombination on genome‐wide patterns of local ancestry exemplified by supplemented brook charr populations

et al. 2019

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Assessing the immediate and long‐term evolutionary consequences of human‐mediated hybridization is of major concern for conservation biology. Several studies have documented how selection in interaction with recombination modulates introgression at a genome‐wide scale, but few have considered the dynamics of this process within and among chromosomes. Here, we used an exploited freshwater fish, the brook charr (Salvelinus fontinalis), for which decades of stocking practices have resulted in admixture between wild populations and an introduced domestic strain, to assess both the temporal dynamics and local chromosomal variation in domestic ancestry. We provide a detailed picture of the domestic ancestry patterns across the genome using about 33,000 mapped single nucleotide polymorphisms genotyped in 611 individuals from 24 supplemented populations. For each lake, we distinguished early‐ and late‐generation hybrids using information regarding admixture tracts. To assess the selective outcomes following admixture we then evaluated the relationship between recombination and admixture proportions at three different scales: the whole genome, chromosomes and within 2‐Mb windows. This allowed us to detect a wide range of evolutionary mechanisms varying along the genome, as reflected by the finding of favoured or disfavoured introgression of domestic haplotypes. Among these, the main factor modulating local ancestry was probably the presence of deleterious recessive mutations in the wild populations, which can be efficiently hidden to selection in the presence of long admixture tracts. Overall, our results emphasize the relevance of taking into consideration local ancestry information to assess both the temporal and the chromosomal variation in local admixture ancestry toward better understanding post‐hybridization evolutionary outcomes.

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Neophytes may promote hybridization and adaptations to a changing planet

Staude,

Ebersbach

2023

Ecology and Evolution

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Human activities erode geographic barriers, facilitating hybridization among previously isolated taxa. However, limited empirical research exists on the consequences of introduced species (neophytes) for hybridization and subsequent evolutionary outcomes. To address this knowledge gap, we employed a macroecological approach. First, we examined the spatial and phylogenetic overlap between neophytes and hybrids by integrating the Plants of the World Online database with the Global Naturalized Alien Flora database. Second, leveraging the largest dated plant phylogeny available, we compared diversification rates between genera containing hybrids and neophytes versus those without. Third, focusing on the extensively studied hybrid flora of Britain, we studied the spatial distributions of hybrids in relation to neophyte and native parents, assessing potential adaptations to anthropogenic disturbances and impacts on native species. Overall, our findings highlight positive ties between contemporary biodiversity redistribution and hybridization. Spatially (across countries) and phylogenetically (across genera), neophyte incidence was positively associated with hybrid incidence. Genera comprising both hybrids and neophytes displayed significantly higher diversification rates. Neophyte hybrids primarily occupied areas with a higher human footprint, with limited evidence of hybrids threatening native species throughout their range in more natural habitats. These results challenge the notion that species naturalizations and hybridizations exclusively yield negative outcomes for biodiversity. While it is conceivable that anthropogenic hybridization may facilitate recombination of genetic variation and contribute to conserving genetic diversity in disturbed environments, further research is needed to fully understand these processes.

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Detecting the True Extent of Introgression during Anthropogenic Hybridization

Cited by 114 publications

References 81 publications

Genetic tools in the management of invasive mammals: recent trends and future perspectives

Genetic tools in the management of invasive mammals: recent trends and future perspectives

The role of recombination on genome‐wide patterns of local ancestry exemplified by supplemented brook charr populations

Neophytes may promote hybridization and adaptations to a changing planet

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