Michele Zwartjes

U.S. Fish and Wildlife Service · Oregon Fish and Wildlife Office

The northern spotted owl (Strix occidentalis caurina) was listed as threatened under the U. S. Endangered Species Act (ESA) in 1990. We applied modern spatial conservation theory and models to evaluate several candidate critical habitat networks, and sought an efficient conservation solution that encompassed the highest value lands for spotted owl...

Differences between empirical estimates of northern spotted owl densities and HexSim-derived estimates (mean and 95% CI of 5 replicates) for eight demographic study areas. (TIF)

Comparison of distribution of northern spotted owl dispersal distances derived empirically from banded owls (Forsman et al. 2002; n = 328) and from HexSim simulations (n = 850,000). (TIF)

Details of modeling methods and results. (DOCX)

The goal of our study was to determine how golf courses in the desert environment impact the indigenous bird community and, particularly, to see whether golf courses may serve as surrogate riparian habitats for southwestern birds. We compared the avian communities on 5 golf courses in the Albuquerque, New Mexico area (4 traditional and 1 “naturalis...

The goal of our study was to determine how golf courses in the desert environment impact the indigenous bird community and, particularly, to see whether golf courses may serve as surrogate riparian habitats for southwestern birds. We compared the avian communities on 5 golf courses in the Albuquerque, New Mexico area (4 traditional and 1 "naturalis...

The goal of our study was to determine how golf courses in the desert environment impact the indigenous bird community and, particularly, to see whether golf courses may serve as surrogate riparian habitats for southwestern birds. We compared the avian communities on 5 golf courses in the Albuquerque, New Mexico area (4 traditional and 1 “naturalis...

The extremely small size (5-7 g) of todies, together with their taxonomic affinities (Order Coraciiformes) and tropical distribution, suggest that the thermoregulatory physiology of these birds merits detailed investigation. Here, we present results of a study on body temperature regulation and metabolic rate of one species, the Puerto Rican Tody (...

The significance of multiple ornaments of male birds and other animals is currently not well understood. Male red junglefowl,Gallus gallus, possess a number of morphological traits that appear to be ornamental in nature. These traits include components of the colourful plumage and fleshy structures on the face and head, the single, medially-located...

Fluctuating asymmetry, the random deviation from perfect bilateral symmetry, has recently attracted considerable attention. Levels of asymmetry have been shown to correlate with measures of individual quality. We measured asymmetry in a variety of ornamental and non-ornamental traits in red junglefowl, Gallus gallus and examined the patterns of asy...

The left testis tends to be larger than the right in most avian species. Moller (1994 hypothesized that the degree of a directional asymmetry in the testes should be greater in high-quality males and hence should be positively correlated with secondary sexual traits. We examined both directional and absolute testicular asymmetry in Red Junglefowl (...

Preservation of genetic diversity within declining populations of endangered species is a major concern in the discipline of conservation biology. The endangered cheetah, Acinonyx jubatus, exhibits relatively little genetic variability (polymorphism = 0.02–0.04, heterozygosity = 0.0004–0.014). Since the discovery of the cheetah's relative homozygos...

Thesis (Ph. D.)--University of New Mexico, 1996. Includes bibliographical references (leaves 88-103).