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The Lahontan Cutthroat Trout (Oncorhynchus clarki henshawi) is native to the Lahontan basin of northern Nevada, northeastern California, and southeastern Oregon. Like other native trout species, the Lahontan Cutthroat Trout is found in a wide variety of cold-water habitats including large terminal alkaline lakes, alpine lakes, slow meandering rivers, montane rivers, and small headwater tributary streams. They currently occupy only about 10 percent of their historic range primarily due to habitat fragmentation from dams and water diversions, changes in water flow patterns, loss of riparian and aquatic habitat quality, severe drought conditions, and the introduction of non-native trout species. One population in Walker...
The Sonoran Desert is the only place in the world where Saguaro cacti grow. It can take up to 100 years for a Saguaro cactus to grow an arm in areas of low precipitation. The Sonoran Desert receives more rainfall than any other desert, which is approximately 10 inches (25 centimeters) a year on average. In the 1800s, many people used the Gila River as a trail across Arizona. This trail became known as the Gila Trail. Arizona is large enough to fit all of New England plus the State of Pennsylvania inside of it. Arizona is the only State besides Hawai'i that does not observe Daylight Savings time. Santa Fe, New Mexico, is the highest capital city in the United States at almost 7,200 feet (2,286 meters) above sea level....
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The Woundfin (Plagopterus argentissimus) once ranged from southwest Utah to southern Arizona in the Colorado and Gila River basins, but now only occur in 12 percent of its historical range, and is classified as critically endangered. It prefers quiet water adjacent to riffles of swift, warm, turbid small to medium rivers, but spawns in swifter flowing water over gravel. Populations have been affected by habitat loss, fragmentation, and degradation caused by dams and water diversions. Woundfin populations have also shown declines in areas where the non-native Red Shiner has proliferated due to changes in water flow patterns caused by dams and diversions. The Red Shiner is both a predator of and a competitor with...
The Pahrump Poolfish (Empetrichthys latos) is an endangered endemic springfish and is the only remaining species in its genus, Empetrichthys. Originally occurring only in a large spring in southern Nevada, its entire historic habitat was lost in the 1960s due to excessive groundwater pumping, which desiccated the spring system. This species now exists in several refuge habitats in southern and central Nevada, as efforts to restore its original habitat have thus far been unsuccessful.
The Desert Pupfish (Cyprinodon macularius) is a Federally listed endangered species found in shallow waters of rare desert springs, small streams, and marshes. The typical habitat includes clear water with aquatic plants or algae. These are difficult habitats for fish as they have high salinity water, high water temperatures, and low oxygen concentrations. Decline of the Desert Pupfish has been associated with dam construction, water diversions, groundwater pumping, pesticide drift, and encroachment of non-native vegetation such as Tamarix, also known as Salt Cedar. Salt Cedar can alter riparian habitats and the subsequent shading and roots can alter aquatic habitats.
Two rare trout subspecies, the Apache Trout (Oncorhynchus apache) and Gila Trout (Oncorhynchus gilae), are endemic to high elevation areas of Arizona and New Mexico. They are particularly threatened by hybridization with non-native trout and devastating wildfires. Severe wildfires caused by land use changes and exotic plants result in sedimentation and ash deposition in the clear waters where they live.
The endangered Gila Chub (Gila intermedia) is found in springs and small streams of the upper Gila River basin mostly in southern Arizona but also in portions of Mexico. It prefers quiet, deep pools near cover, such as vegetation or boulders. The Gila Chub has been eliminated from 85 percent of its former range as a consequence of predation from introduced species and habitat loss resulting from water diversions, road crossings, livestock grazing, declining water quality, and groundwater pumping.
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