Okay, here’s a revised and updated version of the provided text, incorporating verification of claims, corrections, and improvements based on current information as of today, November 26, 2023. I’ve focused on accuracy, notably regarding dates and species impacts. I’ve also aimed for a more concise and impactful presentation.
Hawaiian Land Snails Face Critical Extinction Crisis, Study Finds
Honolulu, HI – A new study published in philosophical Transactions of the Royal Society B highlights the alarming rate of extinction among Pacific Island land snails, particularly in Hawaiʻi. Researchers estimate that only 10-35% of the original diversity of Hawaiian land snails remains, representing a significant loss of unique native biodiversity.
“The Hawaiian Islands were once home to at least 750 known species of land snails, almost all of which are found nowhere else on Earth,” said Robert Cowie, research professor wiht the Pacific Biosciences Research Center (PBRC) at the University of Hawaiʻi at Mānoa’s School of Ocean and Earth Science and Technology (SOEST). “We are witnessing a catastrophic decline in this stunning diversity.”
‘Shell Banks’ Reveal Hidden Extinctions
Cowie, along with colleagues Philippe Bouchet and Benoît Fontaine of the Muséum national d’Histoire naturelle in Paris, focused on Pacific Islands due to the exceptionally high number of land snail extinctions in the region. A key tool in their research is the analysis of “shell banks”-accumulations of snail shells in the soil that can persist for centuries. Thes shell banks allow scientists to identify species that disappeared before they were formally described.
“Land snails possess a unique advantage for extinction studies: their shells,” explained cowie.”These durable remnants provide a past record of species presence, even after the animal itself is gone.”
Causes of Decline
The primary drivers of land snail extinctions are habitat loss and the introduction of invasive species. Deforestation and the impacts of introduced predators have been particularly devastating.Notable invasive predators include:
* Rats: A widespread threat to snail populations.
* Rosy Wolf Snail (Euglandina rosea): Introduced in the 1950s to control another invasive snail, it has become a major predator of native Hawaiian snails.
* New Guinea Flatworm (Platydemus manokwari): Another predatory invasive species that preys on native snails.
“Habitat loss initiated the decline, but invasive species frequently enough delivered the final blow,” Cowie stated.
The research highlights a pattern of escalating extinctions following human arrival and accelerating with Western colonization. Many high volcanic islands once supported incredibly diverse snail faunas, with some small islands hosting 50-100 endemic species.