Federal Register - December 22, 2021
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Source: Federal Register
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Federal Register / Vol. 86, No. 243 / Wednesday, December 22, 2021 / Proposed Rules
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a meaningful way to the overall pygmyowl population. Each analysis unit within the geographic range of the subspecies maintains a network of population groups that are connected both within and between analysis units.
These population groups have the potential to recolonize areas where other population groups are lost to catastrophic events. All analysis units contribute to the total rangewide population, and population groups within each analysis unit provide population support for that analysis unit and adjacent portions of the range. If an analysis unit is self-sustaining, it provides redundancy across the range, and may provide emigrants to support adjacent analysis units. Research and monitoring have documented exchange
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of individual cactus ferruginous pygmyowls among population groups within the Arizona, northern Sonora, and Texas analysis units, and between the Arizona and northern Sonora analysis units Abbate et al. 2000, p. 30; Flesch and Steidl 2007, p. 37; Proudfoot et al. 2020, unpaginated; AGFD unpublished data.
Habitat fragmentation and reduced vegetation health as a result of ongoing drought have resulted in the extirpation of population groups in Arizona and Texas, but redundancy was exhibited in the northern Sonora analysis unit when drought conditions eased and historically occupied areas were reoccupied Flesch et al. 2017, p. 12.
Despite existing habitat fragmentation, research and monitoring have documented that exchange of individual
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pygmy-owls between population groups and between some analysis units is still occurring. Habitat types used by pygmyowls vary across the range, with some vegetation types being restricted to certain portions of the geographic range.
It is important to maintain pygmy-owl populations throughout the range to provide redundancy to adjacent populations in similar habitat conditions. Due to the broad geographic distribution and network of populations groups that are connected within and between some analysis units throughout most of its range, the pygmy-owl has some ability to recolonize following catastrophic events and is considered to have adequate redundancy.
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