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Your query "" produced 23 result(s).
Search Results for Community: National Park Service
Now showing items 11-20 of 23
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(National Park Service, 1980)In 1975 the Bureau of Land Management (BLM) initiated a series of marine studies in the southern California borderland (Straughan 1977b, 1978). These studies were to establish a baseline and to determine "areas of concern" ...
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(National Park Service, 1980)The macroinvertebrate fauna of the rocky intertidal zone on the Southern California islands is incompletely known; consequently, it has not been possible to determine zoogeographical relationships among the various islands ...
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(National Park Service, 1987)Exotic introduced species can disrupt native ecosystems and be particularly devastating on islands. Two brooms, Dyers' greenwold (Cytisus linifolius) and French broom (C. monspessulanus) (Fabaceae) may potentially outcompete ...
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(National Park Service, 1987)Natural hybridization between Malacothrix polycephala W . Davis (ined.), an annual, and M . incana (Nutt.) Torrey & A. Gray, a perennial, on San Nicolas Island, California was examined using herbarium studies, studies in ...
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(National Park Service, 1987)Certain archaeological sites on the northern Channel Islands dating between ca. 4,500 and 7,500 B.P. contain unusually high frequencies of red abalone (Haliotis rufescens) shells. Assuming that aboriginal peoples living ...
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(National Park Service, 1987)Isla de Cedros lies within an arid climatic region and supports a diversity of vegetation community associations. These range from sarcocaulescent desert, made up of succulent-stem trees and shrubs, to coastal sage scrub, ...
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(National Park Service, 1980)Although decapod crustaceans (crabs, hermit crabs, shrimp, and related groups) are among the largest and most familiar invertebrates of southern California, little is known of their distribution according to depth and ...
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(National Park Services, 1980)In 1968, Schreiber (1970) found that 11.3 per cent of the clutches of Western Gulls (Larus occidentalis wymani) on San Nicolas Island had more than three eggs. He believed that the low hatching success (0.13 per cent) ...
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(National Park Service, 1980)Biologists are familiar with the thought that islands have unique scientific value as natural laboratories where the mainland species pool is reshuffled by differential immigration, extinction, and evolution to form new ...
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(National Park Service, 1980)For 33 years, only two specimens of the garter snake (Thamnophis couchi hammondi) were recorded for Santa Catalina Island and the status of this species remained unknown. In August 1974, a small population was discovered ...
Now showing items 11-20 of 23