Back to Search
Start Over
Springtail phylogeography highlights biosecurity risks of repeated invasions and intraregional transfers among remote islands
- Source :
- Evolutionary Applications, Evolutionary Applications, Vol 13, Iss 5, Pp 960-973 (2020)
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- Human‐mediated transport of species outside their natural range is a rapidly growing threat to biodiversity, particularly for island ecosystems that have evolved in isolation. The genetic structure underpinning island populations will largely determine their response to increased transport and thus help to inform biosecurity management. However, this information is severely lacking for some groups, such as the soil fauna. We therefore analysed the phylogeographic structure of an indigenous and an invasive springtail species (Collembola: Poduromorpha), each distributed across multiple remote sub‐Antarctic islands, where human activity is currently intensifying. For both species, we generated a genome‐wide SNP data set and additionally analysed all available COI barcodes. Genetic differentiation in the indigenous springtail Tullbergia bisetosa is substantial among (and, to a lesser degree, within) islands, reflecting low dispersal and historic population fragmentation, while COI patterns reveal ancestral signatures of postglacial recolonization. This pronounced geographic structure demonstrates the key role of allopatric divergence in shaping the region's diversity and highlights the vulnerability of indigenous populations to genetic homogenization via human transport. For the invasive species Hypogastrura viatica, nuclear genetic structure is much less apparent, particularly for islands linked by regular shipping, while diverged COI haplotypes indicate multiple independent introductions to each island. Thus, human transport has likely facilitated this species’ persistence since its initial colonization, through the ongoing introduction and inter‐island spread of genetic variation. These findings highlight the different evolutionary consequences of human transport for indigenous and invasive soil species. Crucially, both outcomes demonstrate the need for improved intraregional biosecurity among remote island systems, where the policy focus to date has been on external introductions.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Population fragmentation
Biosecurity
lcsh:Evolution
Allopatric speciation
Biodiversity
islands
soil biodiversity
phylogeography
Biology
010603 evolutionary biology
01 natural sciences
Indigenous
invasive species
03 medical and health sciences
springtail
lcsh:QH359-425
genomics
Genetics
population connectivity
Ecology, Evolution, Behavior and Systematics
Ecology
Original Articles
Phylogeography
030104 developmental biology
Genetic structure
Biological dispersal
Original Article
General Agricultural and Biological Sciences
Subjects
Details
- ISSN :
- 17524571
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Evolutionary Applications
- Accession number :
- edsair.doi.dedup.....18fe2c71df9e28039a392ea32181ef4b