DNA study uncovers deeper losses across Hawaiian honeycreeper family tree
Smithsonian researchers have identified the genetic relationships among all Hawaiian honeycreeper species known to have existed—and subsequently faced major losses—since the arrival of Europeans to the islands.
A recent DNA study has unveiled the profound genetic relationships among all Hawaiian honeycreeper species that once existed and subsequently faced significant losses since the arrival of Europeans in the islands. Conducted by researchers at the Smithsonian's National Zoo and Conservation Biology Institute and the National Museum of Natural History, the study, published in the Proceedings of the National Academy of Sciences, provides a comprehensive map of the evolutionary context of these diverse avian groups.
Originating from a single ancestor, around 60 Hawaiian honeycreeper species evolved within a small time frame, making them a prime example of adaptive radiation. However, the current scenario is grim, with only 17 species surviving, most of which face extinction due to habitat loss, disease, invasive predators, and climate change.
The genetic study has revealed that most species emerged approximately 2.5–3.5 million years ago during a rapid diversification event, coinciding with the formation of the island of Oahu. This period of diversification was facilitated by the unoccupied habitats on the newly formed island, allowing for the formation of distinct populations that contributed new genetic material to other lineages on older islands.
The study also confirmed genetic mixing between two honeycreeper species, ōū and Lāna i hookbill, and found that closely related honeycreepers like amakihi, which existed on different islands, still share genetic material today. The research highlights the importance of museum and paleontological specimens in genomic research, demonstrating the success of minimally invasive techniques in extracting genetic data from ancient specimens.
Looking ahead, researchers aim to investigate the impacts of introduced diseases, such as avipoxvirus and avian malaria, on honeycreeper populations, as well as understanding how these diseases have affected the birds and pathogens evolutionally.
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