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Our studies of the association between the lesser earless lizard (Holbrookia maculata) and Gunnison's prairie dogs (Cynomys gunnisoni) revealed: (1) the lesser earless lizard was more abundant on prairie dog colonies than off, (2) lesser earless lizard abundance was positively correlated with prairie dog burrow abundance; (3) lesser carless lizards responded positively to artificial burrows created on noncolonized areas; and (4) lesser earless lizards used prairie dog burrows as refuges from predators; however, the relative use of burrows was greatest at high and low temperature extremes. Although prairie dogs alter habitat in many ways, our study suggests that burrows are an important mechanism involved in the...
Raptors were counted at approximately 2-week intervals between March and November 1985-1987 in the Moreno Valley, Colfax Co., New Mexico. During that period, an epizootic of plague (Yersinia pestis) swept through the valley and sequentially killed Gunnison's prairie dogs (Cynomys gunnisoni) in three areas of approximately 25 km2 each. Red-tailed hawk (Buteo jamaicensis) numbers did not change significantly over the study period. Although golden eagles (Aquila chrysaetos) declined in abundance, their numbers did not recover with the recovery of prairie dogs in 1987. Ferruginous hawks (B. regalis) were abundant during autumn migration where prairie dogs were abundant, but their numbers declined significantly with...
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Erigeron kachinensis is a rare endemic of the Colorado Plateau regions of southeastern Utah and southwestern Colorado. It occurs in small, isolated alcoves (recessed areas in canyon walls) at seeps arising along canyon walls in sandstone substrates. One hundred randomly selected individuals of E. kachinensis within each of six alcoves in Natural Bridges National Monument, San Juan County, Utah, were monitored for 5 yr (1990-1994). Survival of the 600 individuals was followed over the monitoring interval. Vegetative and reproductive parameters were assessed for the survivors each year. Mortality varied among the study alcoves and individual size-classes. Mortality was heavily concentrated in the smaller size-classes....
    map background search result map search result map Demography and Life History Characteristics of the Rare Kachina Daisy (Erigeron kachinensis, Asteraceae) Demography and Life History Characteristics of the Rare Kachina Daisy (Erigeron kachinensis, Asteraceae)