However, they sometimes accept cowbird eggs and have been documented raising bronzed cowbird fledglings in 5-8% of active nests in the LRGV
(Hathcock and Brush, 2004; Werner et al.
Because of the high concentration of wetlands along the Rio Grande and the extensive habitat fragmentation in the LRGV
, we hypothesized that (1) the linear density of individuals is greatest nearer the river, (2) gene flow caused by dispersal of individuals is reduced, and (3) the population dynamics of the species could best be described by a metapopulation model.
As of 1990, more breeding white-winged doves occurred outside the LRGV
than within it (George et al.
Carlton confirmed identifications by examination of male genitalia and com parison to published illustrations with vouchers from LRGV
populations (Agnew et al.
Habitat degradation in the LRGV
(Curtis and Ripley 1975; Lonard and Judd 1985, 1991; Brush and Cantu 1998) coupled with anthropogenic landscape scale changes increasing habitat suitability north of the LRGV
may be facilitating this change in White-winged Dove distribution (Kiel and Harris 1956, Cottam and Trefethen 1968, West et al.
It is estimated that less than 5% of the habitat that originally covered the LRGV
still remains (Purdy 1983; Jahrsdoerfer & Leslie 1988).
It is found on a variety of soils, but is especially abundant in the LRGV
on caliche soils in western Hidalgo and Starr counties.
Since 95% of the LRGV
native brushland has been destroyed (Purdy 1983; U.
Since 1958, Texas Parks and Wildlife Department (TPWD) has been involved in re-vegetation in the LRGV
to create white-winged dove (Zenaida asiatica) habitat and to promote biodiversity.
There are three LRGV
sites in Starr County located over 10 km north of the Rio Grande, two of which were visited briefly in the late afternoon of March 24.
Singing birds or pairs were seen during 1978 (Gehlbach 1987), 1994, 1996 and 1998 (Haynie 1995; Lockwood 1999) in at least one location/year in the LRGV
No PCBs were found in fishes collected from the Rio Grande or other LRGV