The U.S. Fish and Wildlife Service is proposing to remove 23 species, 11 of them from Hawaiʻi and the Pacific Islands, from the Endangered Species Act (ESA) due to extinction. Based on reviews of the best available science for each of these species, the Service has determined these species are extinct, and thus no longer require listing under the ESA.

The purpose of the ESA is to protect and recover imperiled species and the ecosystems upon which they depend. For the species proposed for delisting, the protections of the ESA came too late, with most either extinct, functionally extinct, or in steep decline at the timing of listing.  The growing impacts of climate change are anticipated to further exacerbate these threats and their interactions.

The following species are being proposed for de-listing:

Hawaiʻi and the Pacific Islands – Eleven species from Hawaiʻi and Guam are being proposed for delisting due to extinction these include the bridled white-eye, Kauaʻi akialoa, Kauaʻi nukupuu, Kauaʻi `o`o (honeyeater), large Kauaʻi thrush (kama), little Mariana fruit bat, Maui akepa, Maui nukupuu, Molokaʻi creeper (kakawahie), Phyllostegia glabra var. lanaiensis (no common name), and po`ouli (honeycreeper).  Species endemic to islands face a heightened risk of extinction due to their isolation and small geographic ranges. Hawaiʻi and the Pacific Islands are home to more than 650 species of plants and animals listed under the ESA. This is more than any other state, and most of these species are found nowhere else in the world.

Ivory-billed woodpecker –  Once America’s largest woodpecker, it was listed in 1967 as endangered under the precursor to the ESA, the Endangered Species Preservation Act (ESPA). The last commonly agreed upon sighting of the ivory-billed woodpecker was in April 1944 on the Singer Tract in the Tensas River region of northeast Louisiana. Despite decades of extensive survey efforts throughout the southeastern U.S. and Cuba, it has not been relocated. Primary threats leading to its extinction were the loss of mature forest habitat and collection.

Bachman’s warbler – As early as 1953, Bachman’s warbler was one of the rarest songbirds in North America. When first listed in 1967 as an endangered species under the Endangered Species Preservation Act, the bird had not been seen in the U.S. since 1962. Last documented in Cuba in 1981, there have been no verifiable sightings in that country since then. The loss of mature forest habitat and widespread collection are the primary reasons for its extinction.

Eight species of freshwater mussels – Reliant on healthy streams and rivers with clean, reliable water, freshwater mussels are some of the most imperiled species in the U.S., home to more than half of the world’s species of freshwater mussels. Mussels proposed for delisting due to extinction are all located in the Southeast, America’s biodiversity hot spot for freshwater mussels.  They are the: flat pigtoe (Mississippi), southern acornshell (Alabama, Georgia, Tennessee), stirrupshell (Alabama), upland combshell, (Georgia, Alabama, Tennessee), green-blossom pearly (Tennessee, Virginia), turgid-blossom pearly mussel (Tennessee, Alabama, Arkansas), yellow-blossom pearly mussel (Tennessee, Alabama) and the tubercled-blossom pearly mussel(Alabama, Illinois, Indiana, Kentucky, Tennessee, West Virginia, southern Ontario, Canada).

San Marcos gambusia – Listed in 1980, this freshwater fish was found in the slow-flowing section of the San Marcos River in Texas. The San Marcos gambusia had a limited historic range of occurrence and has not been found in the wild since 1983. Primary reasons for its extinction include habitat alteration due to groundwater depletion, reduced spring flows, bottom plowing and reduced aquatic vegetation, as well as hybridization with other species of gambusia.

Scioto madtom – Listed as endangered in 1975, the Scioto madtom was a fish species found in a small section of the Big Darby Creek, a tributary of the Scioto River, in Ohio. The Scioto madtom was known to hide during the daylight hours under rocks or in vegetation and emerge after dark to forage along the bottom of the stream. Only 18 individuals of the madtom were ever collected with the last confirmed sighting in 1957. The exact cause of the Scioto madtom’s decline is unknown, but was likely due to modification of its habitat from siltation, industrial discharge into waterways and agricultural runoff.

While protections were provided too late for these 23 species, the ESA has been successful at preventing the extinction of more than 99% of species listed. In total, 54 species have been delisted from the ESA due to recovery, and another 56 species have been downlisted from endangered to threatened.  The Service’s current workplan includes planned actions that encompass 60 species for potential downlisting or delisting due to successful recovery efforts. Additionally, numerous species have avoided ESA listing thanks to the collaborative efforts of federal agencies, states, Tribes and private landowners, with the ESA serving as a catalyst for conservation efforts that help protect imperiled species and their habitat.

 

AP Photo/Haven Daley