Filters: Tags: 2015 (X) > partyWithName: Dana M. Infante (X)
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Because fish reflect the quality of the habitat where they live, habitat conditions were evaluated by estimating how strongly various human habitat disturbances affect stream fish in all parts of the country. The national datasets used for this assessment included 26 variables that accounted for different human disturbances to aquatic habitats. These included: the quantity of urban, agriculture, and pasture lands in watersheds; major point-sources of water pollution; frequency of dams and road crossings throughout river networks; and intensity of mining activities in watersheds. Five natural landscape variables were also used to account for their potential influences on stream fishes. Because of broad differences...
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): Population density Impervious surface cover Road length density Pasture and hay land use Low intensity urban land use Top three most pervasive disturbances to creeks (watersheds <100 km 2 in area) across all spatial scales: Population density Impervious surface cover Road length density Top three most pervasive disturbances to rivers (watersheds >100 km 2 in area) across all spatial scales : Pasture and hay land use Crop land use Impervious surface Top...
While the overall assessment indicated that fish habitat in this region is some of the most threatened in the United States, some of the key fish habitat forming processes, such as water flow (hydrology) and grazing intensity, could not be fully included in this assessment as there are no national coverages for all of the supporting data needed to properly examine these processes. As a result, habitat condition (quality) has likely been overestimated for some systems in this region and the risk of degradation is likely higher than estimated. It is expected that future national assessments will include information on more of the key habitat processes as resources and data are available. The results from this assessment...
Most severe disturbances in the Pacific Coast States associated with stream reaches being scored as having high or very high risk of habitat degradation. Disturbances are grouped into large groups (fragmentation by dams; nutrient and sediment pollution; human population; road length and crossings; water withdrawals; urban land use; agricultural land use; mines and impervious surface cover) within the four spatial scales (local catchment, network catchment, local buffer, and network buffer). Only disturbance groups that have greater than 5% of stream length in a given category are represented in this figure. Note that not all disturbance categories are available for each spatial scale; buffers have only urban land...
In general, the northern portion of this region, such as Maine, upper Vermont and New Hampshire, and the Adirondack and Catskill Mountains in New York, are at lower risk of current degradation than the southern areas, where population pressures are more intense. Overall, 53 percent of the stream miles in the Northeastern States have a low or very low risk of habitat degradation. However, the Northeastern States have experienced extensive alteration and loss of aquatic habitats in many areas. As a result, 32 percent of the stream miles have high or very high risk of aquatic habitat degradation and the region is one of the most threatened in the conterminous United States. The most common disturbances in the region...
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Tags: 2015,
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Key elements of the 2015 national assessment of stream fish habitats follow the 2010 assessment, including: 1) the idea that fishes reflect the quality of habitat in which they live; and 2) human landscape factors pose a risk to the condition of stream habitat, and indirectly, to fishes. The assessment followed five broad steps (Figure 1), and each are described in detail below.
Alaska is the largest state in the United States (586,412 square miles) and has a diverse array of fish habitats including most of the nation’s intact and highest condition fish habitat. Alaska has an estimated 46,882 miles of coastal shoreline, more than 3 million lakes, and at least 365,000 miles of rivers and streams. Pacific salmon (five species), pollock, halibut, Pacific cod, king crab, and many other species support robust subsistence, recreational, and commercial fisheries, nearly all of which come from self-sustaining wild populations. For Alaskans, fishing is an integral part of their heritage and culture and an important means of supporting their families. The inland assessment for Alaska focuses on...
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This report updates and revises the 2010 “ Status of Fish Habitats in the United States” that summarized initial results of a comprehensive national assessment of aquatic habitats at an unprecedented scale and level of detail. This 2015 report provides even greater detail and improves our knowledge of the condition of fish habitat in the United States. The 2010 inland streams assessment characterized fish habitat condition using stream fish data from more than 26,000 stream reaches, while the 2015 assessment was based on fish data from more than 39,000 stream reaches nationally. To increase accuracy, the 2015 inland stream assessment incorporated 12 additional human disturbance variables into the fish analysis when...
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The U.S Geological Survey (USGS) is partnering with the National Fish Habitat Partnership (NFHP) to produce the 2015 report entitled, "Through a Fish's Eye: The Status of Fish Habitats in the United States 2015". The information contained within this item is a product of NFHP. The Bureau is neither responsible nor liable for the accuracy or the use of the scientific content within this item. This content is considered preliminary pending subsequent review and approval
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Classifying Stream Reaches in Hawaii based on Ecological Potential Besides influences of human landscape factors on stream organisms, many “natural” landscape factors also affect distributions and abundances of species found in different stream habitats. To account for those influences, we used an analytical approach to create groupings of perennial stream reaches with similar natural landscape characteristics that were found to be influential to distributions of nine native stream taxa including fish, shrimp, and snails (Table 2). This approach, referred to as classification, is driven by relationships between natural landscape factors and stream organisms and does not account for influences of anthropogenic factors....
The Central Midwest states influence some of the nation’s major rivers, such as the Mississippi, Missouri, Ohio, Des Moines, Wabash, and Illinois Rivers. These states also border lakes Michigan and Erie, and contain numerous reservoirs, impoundments, and smaller natural lakes. The Central Midwest states have experienced nearly two centuries of urban expansion, manufacturing, agriculture, and mineral extraction. As an example, of the 26,000 miles of streams and rivers in Illinois, only 240 acres of stream and river habitat are now considered high quality natural areas. These factors influenced this assessment, which estimated that 67 percent of the Central Midwestern river and stream miles have a high or very...
The majority of streams, particularly in the headwater reaches, in the Mid-Atlantic States have a low risk of current habitat degradation using the factors assessed, with most of these streams located in heavily-wooded West Virginia, Delmarva Peninsula, southern New Jersey, rural portions of central and eastern Virginia, and central Pennsylvania. Overall, 55 percent of the rivers and streams in the mid-Atlantic fall into the low and very low categories of risk of habitat degradation from the factors assessed. However, an examination of water flow patterns (hydrology) was not included, thus some of the areas scored as low risk may in fact be at higher risk. The most common disturbances in this region are associated...
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Tags: 2015,
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MidAtlanticStates,
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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): Low intensity urban land use Impervious surface Pasture and hay land use Population density Crop land use Top five most pervasive disturbances, specific to spatial scales : Low intensity urban land use in network catchments Low intensity urban land use in local catchments Impervious surface cover in network catchments Low intensity urban land use in local buffers Pasture and hay land use in network catchments Low intensity urban land use makes up the majority...
The United States is home to a diverse array of freshwater and marine fish, shellfish, and other aquatic species. More than 3,000 species of fish inhabit America’s streams, rivers, lakes, reservoirs, marshes, swamps, bays, estuaries, coral reefs, seagrass beds, shallow water banks, deep ocean canyons, and other aquatic habitats. The United States is also home to more than 322 million people, 39% of whom live near the coasts and all depending on the same water that fish call home. In 2012, approximately 25 percent of the nation’s acreage was agricultural and 6 percent was developed. However, these and other consequences of human inhabitation affect much broader areas by altering water flow (hydrology), water quality,...
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