A Relict Marsupial’s Southern Surprise: Range Extension Reveals Evolutionary Resilience
A new study in Ecology and Evolution reports a significant southern range extension for the monito del monte (Dromiciops gliroides), a small arboreal marsupial endemic to South America and the sole living representative of the ancient order Microbiotheria. Researchers have documented a population approximately 100 kilometers south of its previously known limit, near Río Figueroa in central Patagonia (44° S). Genetic analysis using mitochondrial and nuclear markers confirmed the specimen belongs to the southern clade of D. gliroides, clustering with populations from Chiloé Island and the southern Andes. This discovery pushes the species’ known distribution into colder, more seasonal Nothofagus–Chusquea forests, suggesting the existence of previously undocumented populations in the Aysén region. The finding highlights the species’ adaptive capacity and underscores the role of these southern forests as potential critical refugia for this unique evolutionary lineage.
Study Significance: For evolutionary biologists, this range extension provides a real-time case study in biogeography and adaptation, offering insights into how relict lineages persist under changing climatic pressures. It directly informs models of speciation and population genetics by identifying new, potentially isolated populations that may act as genetic reservoirs. The discovery necessitates updated conservation strategies, prioritizing these southern habitats to preserve the genetic diversity of a lineage critical for understanding marsupial phylogenetics and the evolutionary history of South American fauna.
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