evolutionarily significant unit


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evolutionarily significant unit

[‚ev·ə‚lü·shə¦ner·ə·lē sig¦nif·i·kənt ′yü·nət]
(ecology)
A distinct local population within a species that has very different behavioral and phenological traits and thus harbors enough genetic uniqueness to warrant its own management and conservation agenda. Abbreviated ESU.
References in periodicals archive ?
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.
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.
The Evolutionarily Significant Unit, 2 Wana Chinook Tymoo 8 (1992) (a publication of the Columbia River Inter-tribal Fish Commission); Stephen O'Brian & Ernst Mayr, Bureaucratic Mischief.
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.
Biologists "ought properly to address the conservation of evolutionarily significant units (ESUs) within species," Ryder declared 14 years ago.
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.
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