Near-Threatened is a conservation status assigned to a species or lower taxon (an evolutionarily significant unit
) that may be considered threatened with extinction in the near future, although it does not currently qualify for the threatened status (Daniel et al.
Evolutionarily Significant Unit
(ESU) into two components--hatchery and
Federal law dictates that all or none of the fish in what's known as an evolutionarily significant unit
should be listed, Hogan concluded.
2d at 1146 (stating that factors contributing to the salmon's decline in Oregon include forestry practices, logging and road building, urbanization, disturbance of riparian habitat (such as increased sedimentation of the rivers and streams), and agricultural practices and their consequences such as overgrazing, water diversion, runoff, and soil compaction); see also Endangered and Threatened Species; Threatened Status for Southern Oregon/Northern California Coast Evolutionarily Significant Unit
(ESU) of Coho Salmon, 62 Fed.
Steelhead (Oncorhynchus mykiss) Based on a determination by the National Marine Fisheries Service, which has primary ESA jurisdiction for most marine species, the Evolutionarily Significant Unit
(ESU) of steelhead in northern California was listed on September 7 as threatened.
How to define an evolutionarily significant unit
Part One sets the theme of the book by focusing on the Evolutionarily Significant Unit
(ESU), a concept introduced by the National Marine Fisheries Service (NMFS) in 1991 for identification of distinct population segments in Pacific salmon.
(1) Threatened Status for Central California Coast Evolutionarily Significant Unit
of Coho Salmon, 61 Fed Reg.
From these status assessments, NOAA Fisheries scientists identified 52 evolutionarily significant units
(ESUs), the smallest population unit that can receive federal protection under the ESA.
Molecular variation and evolutionarily significant units
in the endangered Gila topminnow.
(61) Designated Critical Habitat: Critical Habitat for 19 Evolutionarily Significant Units
of Salmon and Steelhead in Washington, Oregon, Idaho, and California, 65 Fed.
1989), we feel that separate conservation and management of the four watersheds as evolutionarily significant units
(ESUs) (Waples 1995) should be considered.