Federal Register - June 16, 2021
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Source: Federal Register
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Federal Register / Vol. 86, No. 114 / Wednesday, June 16, 2021 / Rules and Regulations
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Population trends for water howellia are difficult to determine. Substantial numbers of new occurrences have been discovered since listing in 1994, and, most recently, occurrences have been documented in Oregon, where the species was thought to be extirpated.
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However, this may not necessarily indicate a positive population trend.
Rather, this could indicate increased efficiency at finding new occurrences.
Consistent, standardized monitoring has not occurred across the range of the species, making it difficult to document trends, even when repeat monitoring
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has occurred at occupied sites Fertig 2019, pp. 4045. Additionally, an occurrence is broadly defined, and abundance of individual water howellia plants within occurrences fluctuates widely. This is due, in part, to environmental conditions of the preceding autumn, which affect seed
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Figure of historical and extant occurrences of water howellia across the species known range.
