), saltbush (Atriplex sp. Overall, body brownish-olive to gray-green above. To the extent practicable, before implementing activities associated with OM&R of hydroelectric generation and transmission facilities, measures will be identified and implemented that are necessary to avoid take of covered species where such activities could otherwise result in take. According to the Southwestern Willow Flycatcher Recovery Plan, approximately 53% of the known population is found in 10 breeding sites range-wide, while the other 47% are distributed among approximately 100 small sites of 10 or fewer territories. Canals and shallow swales may need to be created to dissect blocks of created cottonwood-willow that will be wide enough (estimated to be at least 25 feet) to create interior forest-edge conditions necessary to support southwestern willow flycatcher habitat, create the microrelief and soil moisture conditions necessary to support a diversity of understory plant species, and supply irrigation water. Territoriality is also maintained on the wintering grounds. An entirely yellow lower mandible (beak) is a characteristic shared by cordilleran flycatchers (Em-pidonax occidentalis), but the throat of the willow is white compared with a yellow throat of the cordilleran. Territory size varies greatly, potentially due to population density, habitat quality, and nesting stage. Table 5-9 in the HCP describes the breeding period for each of the covered species during which, to the extent practicable, vegetation management activities in each species' habitat will be avoided. On average, one egg is laid per day, with a typical clutch size of four eggs laid within 5 days. Wintering grounds for the willow flycatcher include portions of southern Mexico, Central America, and northern South America. Predation is the leading cause of nest failure in many populations of southwestern willow flycatcher, including those along the LCR and its tributaries. The U.S. FWS's Threatened & Endangered Species System track information about listed species in the United States Additional information on this species, as well as source documentation, can be found in the species accounts located at this link (PDF). Critical habitat is in the process of being revised.Â. To ensure that high quality and fully functioning southwestern willow flycatcher breeding habitat is created, the following design and management criteria, subject to adjustment through the LCR MSCP adaptive management process, will be applied to created cottonwood-willow land cover dedicated as replacement southwestern willow flycatcher habitat: Impacts on groundwater levels that support covered species habitat at Topock Marsh will be avoided by maintaining water deliveries for maintenance of water levels and existing conditions. To the extent practicable, before initiating activities involved with river maintenance projects, measures will be identified and implemented that avoid or minimize take of covered species where such activities could otherwise result in take. In the Middle Rio Grande, the Southwestern willow flycatcher migrates through willow, cottonwood and saltcedar stands (Hunter 1988; Cartron et al. The upper beak is darker than the lower beak. Non-Federal lands in Washington, Iron, Garfield, Kane, Emery, Grand, Wayne, and San Juan counties, Utah. Technical Reports on this species can be found here. These measures could include conducting surveys to determine if covered species are present and, if so, deferring the implementation of activities to avoid disturbance during the breeding season; redesigning the activities to avoid the need to disturb covered species habitat use areas; staging of equipment outside of covered species habitats; delineating the limits of vegetation control activities to ensure that only the vegetation that needs to be removed to maintain infrastructure is removed; stockpiling and disposing of removed vegetation in a manner that minimizes the risk of fire; and implementing BMPs to control erosion when implementing ground disturbing activities. Habitat includes streams and standing open water areas and all riparian vegetation including seep willows (Baccharus sp. Riparian habitat along the LCR alone has drastically changed from a cottonwood-willow dominated habitat, including approximately 89,200 acres of potential willow flycatcher breeding habitat, to over 80,000 acres of salt cedar, with no over-bank flooding to help rejuvenate native riparian stands. Fish … The historic breeding range of the southwestern willow flycatcher included southern California, southern Nevada, southern Utah, Arizona, New Mexico, western Texas, southwestern Colorado, and extreme northwestern Mexico. Southwestern willow flycatcher habitat will be created in patches of at least 10 acres, with an objective of creating larger patches of habitat. ), arrowweed (Pluchia sp. Conservation areas will be designed to contain wildfire and facilitate rapid response to suppress fires (e.g., fire management plans will be an element of each conservation area management plan). Uplands without riparian association within the range are not included in the Action Area (DOI, 2015). The willow flycatcher is one of 10 species in the genus Empidonax (meaning gnat or mosquito king). Flycatchers nest in various tree species including Gooddingâs willow, coyote willow, cottonwood, salt cedar, and other native and exotic tree species. In addition to implementing AMM3 and AMM4 below, these measures could include conducting preconstruction surveys to determine if covered species are present and, if present, implementing habitat establishment and management activities during periods when the species would be least sensitive to those activities; or redesigning the activities to avoid the need to disturb sensitive habitat use areas; staging construction activities away from sensitive habitat use areas; and implementing BMPs to control erosion when implementing ground disturbing activities. The Southwestern Willow Flycatcher prefers dense tree and shrub habitat for nesting. Species description:The southwestern willow flycatcher (Empidonax traillii extimus)is a subspecies of the willow flycatcher family. The Southwestern Willow Flycatcher was targeted in 2016 not because its numbers are recovering, but because it stands in the way of development. 1991). The remaining 1,350 acres of the 4,050 acres of created habitat will also be composed of cottonwood-willow types IâIV and will include moist soils, but patches of this habitat may be smaller if site constraints limit the construction of larger habitat patches. For a complete list of all activities, please see the Research and Monitoring Activities web page. LCR MSCP conservation measures that could result in such temporary disturbances will, to the extent practicable, be designed and implemented to avoid or minimize the potential for disturbance. The upper mandible is dark, while the lower mandible is pale to yellowish. ), ash (Fraxinis sp. The Southwestern Willow Flycatcher generally is paler than other Willow Flycatcher subspecies, although this difference is indistinguishable without considerable experience and training, and study skins as comparative reference material. Habitat includes streams and standing open water areas and all riparian vegetation including seep willows (Baccharus sp. Males are usually monogamous, but polygyny does occur. The relative suitability and carrying capacity of saltcedar and cottonwood-willow habitats for nesting southwestern willow flycatchers are difficult to measure under current conditions because saltcedar now dominates most riparian areas along the LCR. Created habitat will include provisions for supporting moist surface soils and standing or slow-moving water required by the species within their territories during the breeding season (may extend from late April to August along the LCR).
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