Relationship To Evolutionarily Significant Units (ESU's)
In consideration of Pacific salmon for listing under the Act, NMFS has relied on the evolutionarily significant unit (ESU) concept and previous developed a policy on the definition of species under the Act (56 FR 58612– 58618; November 20, 1991). The policy applies only to species of salmonids native to the Pacific. Under this policy, a stock of Pacific salmon is considered a DPS if it represents an evolutionarily significant unit (ESU) of a biological species. A stock must satisfy two criteria to be considered an ESU: (1) It must be substantially reproductively isolated from other conspecific population units; and (2) It must represent an important component in the evolutionary legacy of the species. The 1996 joint policy considers the 1991 NMFS policy on Pacific salmon to be consistent with the joint policy, being a detailed extension of it. The joint policy further states that NMFS will continue to exercise the 1991 policy with respect to Pacific salmonids.
Read more about this topic: Distinct Population Segment
Famous quotes containing the words relationship, significant and/or units:
“The relationship between mother and professional has not been a partnership in which both work together on behalf of the child, in which the expert helps the mother achieve her own goals for her child. Instead, professionals often behave as if they alone are advocates for the child; as if they are the guardians of the child’s needs; as if the mother left to her own devices will surely damage the child and only the professional can rescue him.”
—Elaine Heffner (20th century)
“All significant truths are private truths. As they become public they cease to become truths; they become facts, or at best, part of the public character; or at worst, catchwords.”
—T.S. (Thomas Stearns)
“Even in harmonious families there is this double life: the group life, which is the one we can observe in our neighbour’s household, and, underneath, another—secret and passionate and intense—which is the real life that stamps the faces and gives character to the voices of our friends. Always in his mind each member of these social units is escaping, running away, trying to break the net which circumstances and his own affections have woven about him.”
—Willa Cather (1873–1947)