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Plants Of Angel Island, Marin County, California, J. D. Ripley
Plants Of Angel Island, Marin County, California, J. D. Ripley
Great Basin Naturalist
The floristic composition of Angel Island, Marin County, California, is presented. The vascular flora consists of 416 native and naturalized plants, representing 252 genera and 73 families. Eighty species of ornamental plants persisting from cultivation, representing 64 genera and 39 families, are also identified. The nonvascular flora consists of 42 species of fungi, 7 species of green algae, 8 species of brown algae, and 41 species of red algae. The vascular flora occurs in seven plant communities and is composed mainly of the following plant types: forbs (69 percent), grasses (13 percent), shrubs (8 percent), and trees (4 percent). Approximately …
Observations On Seasonal Variation In Desert Arthropods In Central Nevada, Robert D. Pietruszka
Observations On Seasonal Variation In Desert Arthropods In Central Nevada, Robert D. Pietruszka
Great Basin Naturalist
Pitfall and Malaise trap collections from terrestrial arthropod populations in central Nevada were analyzed for four trapping periods during the 1978 growing season. Mites (Acarina) and ants (Formicidae) were the taxa represented by the largest numbers of individuals in pitfall trap collections throughout the season; Malaise collections were composed mainly of aerial taxa (largely Diptera and Hymenoptera). Peak arthropod abundance was recorded during mid-June. Collection diversities for both trapping methods were generally low due to the abundance of a few taxa. Evidence for spatial heterogeneity in arthropod populations was meager; temporal heterogeneity in these populations, however, was more apparent.
Relationships Among Total Dissolved Solids, Conductivity, And Osmosity For Five Artemia Habitats (Anostraca: Artemiidae), Nicholas C. Collins, Gray Stirling
Relationships Among Total Dissolved Solids, Conductivity, And Osmosity For Five Artemia Habitats (Anostraca: Artemiidae), Nicholas C. Collins, Gray Stirling
Great Basin Naturalist
Graphs allowing interconversion between various physical chemical parameters are presented for five Artemia habitats in the western USA. Both the mean osmosity and its typical yearly range differ greatly among habitats. Consequently, Artemia populations provide an interesting opportunity to study physiological and life history adaptations to differing degrees of habitat stability.
Habitat And Plant Distributions In Hanging Gardens Of The Narrows, Zion National Park, Utah, George P. Malanson
Habitat And Plant Distributions In Hanging Gardens Of The Narrows, Zion National Park, Utah, George P. Malanson
Great Basin Naturalist
Hanging gardens are insular plant communities of the Colorado Plateau. This study examines hanging gardens in the Narrows, Zion National Park, Utah. The floristic similarity of gardens and the presence of species in classes of variables which characterize the habitat are disclosed. Although the gardens are isolated and dissimilar, the individual species are not restricted in the range of habitat found. Floristic dissimilarity cannot be attributed to differences in habitat. These results are compared to studies of hanging gardens in eastern Utah.
Short-Term Effects Of Logging On Red-Backed Voles And Deer Mice, Thomas M. Campbell Iii, Tim W. Clark
Short-Term Effects Of Logging On Red-Backed Voles And Deer Mice, Thomas M. Campbell Iii, Tim W. Clark
Great Basin Naturalist
Clearcutting and selective logging effects on red-backed voles (Clethrionomys gapperi) and deer mice (Peromyscus maniculatus) were studied (September–November, 1975; June–October, 1976) in Bridger–Teton National Forest, Wyoming. Five selective cuts (total 137 ha) removed 57 percent (range 34–74 percent) of the trees. One clearcut (9.6 ha) eliminate 84 percent of the trees. Soils remained mesic in selective cuts, but became xeric in the clearcut. Snap-trapping indicated that voles were most abundant on the unlogged and selectively cut mesic sites (76 percent of 408 captures), whereas deer mice were more common on the xeric clearcut (80 percent of …
Some Aspects Of Succession In The Spruce-Fir Forest Zone Of Northern Utah, David J. Schimpf, Jan A. Henderson, James A. Macmahon
Some Aspects Of Succession In The Spruce-Fir Forest Zone Of Northern Utah, David J. Schimpf, Jan A. Henderson, James A. Macmahon
Great Basin Naturalist
A site in the Rocky Mountain subalpine forest zone with which a series of hypotheses concerning ecosystem succession was tested is characterized. Succession from herb-dominated meadows to climax forests of Engelmann spruce and subalpine fir can follow at least four identified pathways. After fire, spruce and fir may reinvade a site directly, follow invasion by aspen, or follow invasion by lodgepole pine, the pathway depending on a combination of physical and biotic factors. In other cases, succession begins with long-established meadows which do not owe their existence to fire. In this latter pathway, aspen invades meadows by suckering and changes …