8031

• UCREFRP Catalog Number: 8031
• Author: U.S. Department of the Interior.
• Title: Fish and Wildlife Service Final Biological and Conference Opinion on Lower Colorado River Operations and Maintenance - Lake Mead to Southerly International Boundary.
• USFW Year: 1997.
• USFW - Doc Type: \
• Copyright Material: NO

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Table 4. Nest height and nest substrate height data by riparian habitat type for the southwestern willow flycatcher.

Habitat Type

Mean Nest H1.
Relative to
Base of Nest
Substrate [m]
:t 1 STD (range)

Mean Nest
Substrate
Height [m]
:t 1 STD (range)

Source

n

Monotypic stands of Geyer
willow (Apache Co., AZ) 33 1.8 :1::0.3 (1.0 - 2.3) 4.4 :1::0.5 (3.5 - 6.0) Muiznieks et al. (1994), Sferra et al. (1995)
Spencer et aI. (1996, 1997)
Mixed native broad leaf, predominantly
Goodding's willow (Yuma Co., AZ) 28 2.1 :1::0.8 (1.2 - 4.9) H. Brown 1902 collections (T. Huels in lilt.)
Mixed native broadleaf (Kern Co.,
CA) 134 2.1 :1::0.1 (0,6 - 10) 5.6 :1::0.3 (1 - 14) Whitfield and Strong (1995)
Mixed native broadleaf/saltcedar
(throughout AZ) 70 4.8 :1:: 1.8 (1.5 - 10.5) 7.4 :1::2.3 (3.5 - 17.0) Muiznieks et al. (1994), Sferra et al. (1995)
Spencer et aI. (1996, 1997)
Mixed native broadleaf/exotic
(Grant Co., NM) 45 7.4 :1::3.6 (2.0 - 14) 12.7 :1::5.2 (4 - 28) Skaggs (1995)
Monotypic saltcedar (throughout AZ) 43 4.3 :1:: 1.3 (2.7 - 8.0) 7.7 :1::2.0 (3.4 - 12.0) Muiznieks et ai. (1994), Sferra et aI. (1995)
Spencer et aI, (1996, 1997)