Filters: Types: OGC WMS Layer (X) > partyWithName: Daniel J Wieferich (X)
13 results (11ms)|
Filters
Date Range
Types Contacts
Tag Types Tag Schemes
|
Agriculture was highly influential on the fish habitat assessment of the Pacific Coastal States. One of the broadest areas implicated is the California Central Valley that extends 450 miles from Redding to Bakersfield. This region grows a wide variety of row crops and fruit trees and supports abundant cattle and dairy farms. Another region of very high risk is Willamette Valley in Oregon, where crops such as berries, vegetables, sod, and vineyards are grown. Silviculture, particularly large-scale timber clearcuts, is another significant agricultural practice in this area. Also at high risk are aquatic habitats in eastern Washington between Spokane and Walla Walla, where wheat, hay, potatoes and apples are the dominant...
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 2015,
Agriculture,
HumanActivity,
PacificCoastRegion,
PacificCoastStates
While this assessment has found that many of the inland streams were at a low or very low risk of degradation, some fish habitat disturbances, including water diversions, timber harvest practices, and intensity of livestock grazing in watersheds, could not be directly included in this assessment because national datasets of these disturbances and their component variables are unavailable. These disturbances are known to have major, negative effects on fish habitats in this region. Their absence from this assessment, along with absences of other disturbances, has likely produced an overestimation of habitat condition (quality) for some water bodies. These gaps need to be kept in mind while examining the results....
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 2015,
PacificCoastRegion,
PacificCoastStates,
RegionalSummary
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 Southern Plains States contain one of the fastest-growing urban centers areas in the country— the Texas Triangle of Houston, Dallas/Fort Worth, and San Antonio, where more than 17 million people are spread over 58,000 square miles. Texas is also part of the Gulf Coast megaregion. In these cities and the surrounding suburbs, large areas of impervious surfaces have replaced natural streamside habitat, increased pollution and sedimentation, and completely altered water flows (hydrology). Declining fish populations are the result, near the cities as well as in downstream river reaches. Water coming from both of these megaregions also seriously affects fish habitat in receiving coastal bays and estuaries. Another...
Reductions of flows resulting from drought and water withdrawals threaten the Fountain Darter (Etheostoma fonticola) in the headwater springs that feed the San Marcos and Comal Rivers, Texas. These are the only two places in the world this species is found. It uses dense aquatic plants and algae as habitat. It is severely threatened by the loss of vegetation caused by an exotic snail and afflicted by a parasitic non-native trematode whose life cycle uses the exotic snail as a host.
The southeastern states contain the rapidly growing urban centers of Atlanta, Greenville, Columbia, Charlotte, and Winston-Salem/Raleigh with suburban corridors between them. In these cities and the surrounding suburbs, large areas of impervious surfaces replace natural streamside habitat, increase pollution and sedimentation, and alter water flow (hydrology). In this 2015 assessment, land cover type was estimated to be a major risk factor for about one-third of the estuaries of the Southeastern states. The United States Department of Agriculture reports that from 1982 to 2012 over 2.6 million acres of rural land in Georgia was developed. Development in North Carolina was almost as high, while South Carolina lost...
Water projects that include large dams and water withdrawal systems alter seasonal and daily water flows (hydrology) and water temperatures, adversely affecting desert species that are adapted to the natural cycles in this region. Combined with water diversions for domestic and agricultural use, drought conditions from 2010 to 2015 in the Southwest adversely affected all desert aquatic habitats. Large rivers in the Southwest states, such as the Colorado River and the Rio Grande, have been greatly affected by the construction of dams and diversions that: interfere with fish migration; alter in-stream habitat characteristics including sediment and woody debris movement; change water quality and temperature; reduce...
Urban areas significantly and negatively affect aquatic habitat quality in the Mountain States. This was particularly apparent in the rapidly growing Denver/Ft. Collins, Boise, Salt Lake City, Great Falls, and Billings areas. Highway corridors along Interstates 25 and 90 in Wyoming and 76 in Colorado were implicated to be causing high to very high risk factors. In 2015, the highly urbanized I-25 corridor between Cheyenne, WY and Pueblo, CO had a population of 4.49 million people. In these cities and their surrounding suburbs, large areas of impervious surfaces (i.e. buildings, parking lots, and roads) replace natural streamside habitat, increase pollution and sedimentation, alter hydrology, and increase the demand...
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 2015,
HumanActivity,
MountainRegion,
MountainStates,
UrbanLandUse
Wheat, corn, and soybeans are some of the primary crops grown in the Northern Plains States. About 8.5 million acres, one-fourth of the state’s land area, are used to grow wheat in North Dakota. In areas of intense cultivation, streams are often channelized for irrigation, reducing their habitat value for fish as temperature, in-channel cover, and stream flow are significantly changed. In addition, watersheds dominated by row-crop agriculture discharge excess sediment and nutrients to downstream waters. Agricultural water withdrawal was also one of the most limiting disturbances identified in this assessment. A large number of groundwater wells in the Nemaha River basin in southeast Nebraska, an area dominated by...
Human-caused modifications to surface and ground water systems throughout Hawaii have drastically altered natural hydrologic regimes (a key fish habitat process), which in turn have profoundly limited the distribution and population sizes of native aquatic fauna. Most water for cities comes from wells, although stream water is used in Upper and East Maui. However, smaller communities and agriculture often rely on surface water obtained through diversions. Irrigation systems have been built to support the cultivation of row crops, such as corn, tomatoes, sugar cane, and nut trees. They transfer large volumes of water from natural watercourses and groundwater and into networks of ditches, tunnels, flumes, reservoirs,...
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 2015,
Hawaii,
HawaiiRegion,
HumanActivity,
ReducedWaterFlows
The Sacramento River represents by far the largest population of returning Chinook Salmon (Oncorhynchus tshawytscha). There are four distinct spawning runs of Chinook Salmon; fall, late fall, winter, and spring. Historically, maximum spawning runs in the Central Valley approached 2 million salmon including: 100,000 late-fall fish; 200,000 winter fish; 700,000 spring fish; and 900,000 early fall fish. Current spawning sizes are a fragment of historic numbers and some of the spawning runs are listed stocks under the Federal Endangered Species Act. In 2009, total Chinook Salmon spawning populations were fewer than 69,000 salmon including: 50,000 fall fish; 10,000 late-fall fish; 3,800 spring fish; and 4,700 winter...
Assessment Results for Rivers and Streams of the Southwestern States A. Pervasive disturbances: The most common disturbances based on total stream length in a given region. Top five overall most pervasive disturbances to all stream reaches, regardless of stream size and across all spatial scales (ranked highest first): Road crossing density Road length density Impervious surface Downstream dam density Population density Top three most pervasive disturbances to creeks (watersheds <100 km 2 in area) across all spatial scales: Road crossing density Road length density Impervious surface Top three most pervasive disturbances to rivers (watersheds >100 km 2 in area) across all spatial scales : Road crossing...
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 2015,
PervasiveSevere,
SouthwesternRegion,
SouthwesternStates
While this assessment has found that much of the stream habitat in this region is at low or very low risk of degradation, some key fish habitat disturbances, including water withdrawals or diversions and intensity of livestock grazing in watersheds, could not be directly included in this assessment because national datasets of these disturbances and their supporting variables are unavailable. These disturbances are known to have major, negative effects on fish habitats in this region. Their absence from this assessment, along with absences of other disturbances, has likely produced an overestimation of habitat condition (quality) for some water bodies. Despite such absences, impairment to fish habitats was determined...
|
|
