Forest floor samples were collected from four hardwood forest stands in West Virginia to study species composition, abundance, and distribution of vegetation that originated from seeds, rootstocks, rhizomes, and so on. The abundance and distribution of pl...
National Technical Information Service (NTIS)
The distribution and composition of the weed seed bank in treatments ... weed abundances and composition in subsequent years, and 2) how ...
NASA Website
... Abstract : On the first investigations of Lake Benthos in North America demonstrated the importance of substratum composition as boulder, gravel ...
DTIC Science & Technology
... on species composition and abundance of 32 New World bat communities distributed between Iowa, USA and Canindeyu, ... ...
NBII National Biological Information Infrastructure
Oct 1, 1974 ... Subject Terms: ABUNDANCE; CHEMICAL COMPOSITION; DISTRIBUTION FUNCTIONS; LIQUIDUS ; PHASE DIAGRAMS; PYROXENES; RARE EARTH ELEMENTS; SILICATES; ...
... about the relative roles of niche-based and stochastic processes in shaping species distributions and community composition reflects, ... ...
Large spatial variation was found in the abundance and species composition of ichthyofauna in seagrass meadows of Apalachee Bay and Indian River lagoon, Florida. Abundance of fishes was a direct function of aboveground seagrass biomass in Apalachee Bay wh...
Study where habitat/area relationships, distribution, abundance, and composition of grassland bird communities were determined for 21 grasslands fragments of 3 grassland types: fescue, fields, mixed grass field...
abundance or isotopic composition between. Antarctic and non-Antarctic ordinary chondrites. Unfortunately, the identity, distribution and isotopic composi- ...
... integrated data set of quality-controlled, globally distributed plankton abundance, biomass and composition data, along with co- ... ...
... 92 African Zoology Published by: Zoological Society of Southern Africa ...
DISTRIBUTION, APPARENT ABUNDANCE, AND LENGTH COMPOSITION OF JUVENILE ALBACORE, Thunnus alalunga composition of juvenile albacore, Thunnus alalunga, were deduced from 127 specimens found in the stomachs of 2 canneries with albacore, Thunnus ala- lunga, and other tuna. In 1965 the fleet was composed of 154 vessels
E-print Network
The overall objective of the juvenile study was to evaluate relative species abundance and size composition of fish communities among selected habitats in estuarine and marine waters of Everglades National Park and to provide descriptions of the habitats ...
This study analyzed species richness, distribution, and sighting frequency of selected reef fishes to describe species assemblage composition, abundance, and spatial distribution patterns among sites and regions (Upper Keys, Middle Keys, Lower Keys, and D...
Information about lamprey species composition, distribution, life history, abundance, habitat requirements, and exploitation in the lower Deschutes River and it's tributaries is extremely limited. Beginning in 2000, we began a multi-year study to assess t...
Information about lamprey species composition, distribution, life history, abundance, habitat requirements, and exploitation in the lower Deschutes River Subbasin is extremely limited. During 2002, we began a multi-year study to assess the status of lampr...
The compositions of the atmospheres of planets, satellites, and comets are discussed, and abundances
NASA Technical Reports Server (NTRS)
... especially the pH of the upper 25 cm mineral soil and ectorganic layers affect the abundance and the distribution of forest species. However, the ... of the first 5 and 5�25 cm mineral soil; L = thickness...
This report presents comprehensive data on species composition and distribution of planktonic rotifers in Saginaw Bay and southern Lake Huron from April to November, 1974. Rotifer species composition and abundance differed greatly between Saginaw Bay and open Lake Huron waters. T...
EPA Science Inventory
Regional zooplankton taxonomic and size compositions and abundance and the high resolution vertical distribution of plankton, fluorescence, and coincident hydrography were described using the Video Plankton Recorder (VPR) along a 7000 km survey of the upp...
Recent spectroscopic results on stellar and solar abundances are reviewed with special reference to (a) standard abundance distribution (Sun, hot stars, diffuse nebulae); (b) abundance peculiarities related to stellar evolution (red giants showing results of H-burning and s-process, peculiar and metallic- ...
Energy Citations Database
This paper proposes a new spectral unmixing strategy based on the normal compositional model that exploits the spatial correlations between the image pixels. The pure materials (referred to as endmembers) contained in the image are assumed to be available (they can be obtained by using an appropriate endmember extraction algorithm), while the corresponding fractions (referred ...
NASA Astrophysics Data System (ADS)
More than 300 pairs of fine and coarse mesh plankton net samples were collected in the northern basin of Lake Chad during an 18-month period, June 1967 to November 1968. The seasonal distribution and abundance of the dominant species of Rotifera and Crustacea are given in addition to a general description of the hydrology and circulation of the northern ...
USGS Publications Warehouse
A fine analysis of nine southern supergiants of spectral types F through K, including the bright Cepheid variable l Car, is presented. The average metal-to-hydrogen ratio is found to be twice the solar value. No essential differences are found between the nonvariable stars and the Cepheid variable.In an initial attempt to determine the spatial distribution of ...
Influence of physiography and vegetation on small mammal abundance and species Composition was investigated at Naval Petroleum Reserve No. 1 in California to assess prey abundance for Federally endangered San Joaquin kit foxes (Vulpes macrotis mutica) and to assess the distribution of two Federal candidate species, ...
... USGS Fact Sheet July 1999 Measuring Variability in Forage Fish Abundance Introduction The abundance, distribution and h...
This abstract reports the Th and Sm concentrations of individual pyroclastic glasses from the Apollo 11, 12, 14, 15, and 17 landing sites and uses these data as a means to evaluate the distribution and abundances of Th and Sm in the lunar mantle.
million years, these two carbon fluxes have been modulated by the relative abundance of diatoms phy- toplankton community composition in the Atlantic Ocean and show that the distribution of diatoms from seasonal cycles to geological transitions. coccolithophorids diatoms stratification climate change
Available HSE data indicates the lunar mantle has <20� lower abundances of these elements than the terrestrial mantle. We review the distribution of these elements in mantle source regions and constraints placed on lunar evolution.
The Kahe Steam-Electric Generating Station's thermal discharge induces a change in the species composition of fishes in those areas where the plume normally reaches the bottom. This shift appears to be related to an increase in benthic algal standing crop...
Species diversity is thought to stabilize functioning of plant communities, although diversity-stability studies have focused on species richness to the neglect of the second component of diversity, species evenness (equitability with which biomass or abundances are distributed among species). An a...
Technology Transfer Automated Retrieval System (TEKTRAN)
... S70. CrossRef, PubMedRosenzweig, M. L. 1998. Preston's ergodic conjecture: the accumulation of species in space and time. 311�348. in McKinney, M. L. ... ...
Net or large phytoplankton species composition and most phytoplankton abundance was measured at three OTEC sites. In the Gulf of Mexico and'Hawaii, diatoms dominated while the blue-green algae Trichodesmium was most common at Puerto Rico. The species rati...
The distribution and abundance of larval Chironomidae were investigated in the first and last lakes of a 4-lake sewage oxidation system. Chiromid species composition and adult seasonal occurrence were examined and the potential of certain species to becom...
Although denitrification in marine environments has been studied intensively at the process level, little is known about the species abundance, composition, distribution, and functional differences of the denitrifying population. Understanding the diversi...
... Thus, there was a pronounced edge effect in distribution of stink bugs in corn. Planting Date. Over all corn fields and sampling dates, the mean number of N. viridula adults per sample for late-planted fie...
This study sought to determine and understand the major processes governing the abundance, distribution, composition and eventual fate of zooplankton on the southeastern shelf of the US in relation to water circulation. Over much of the shelf circulation ...
This study was made to investigate the composition, general distribution, and abundance of commercially or potentially important fauna inhabiting the Lake Pontchartrain-Lake Maurepas estuarine complex, so that comparisons with previously completed wetland...
King county has over ten years of data on the distribution and abundance of amphibians in wetlands. Changes in wetland amphibian composition are being analyzed in relationship to physical changes within wetlands and surrounding land-use development and change. In addition to tes...
The objective of this research was to provide qualitative and quantitative information of the distribution of macrobenthic animals in the experimental test site of Project WEAP, located in Block Island Sound. Correlations of the acoustical properties of t...
To investigate the effect of parent body processes on the abundance, distribution, and enantiomeric composition of amino acids in carbonaceous chondrites, the water extracts from nine different powdered Cl, CM, and CR carbonaceous chondrites were analyzed...
This 3-yr study documents the taxonomic composition, relative abundance, and seasonal distribution of darkling beetles occupying the Hanford Site in southcentral Washington. A taxonomic key and species diagnosis are provided to assist in identification by...
... Black-throated Blue Warbler (Dendroica caerulescens) and Veery (Catharus fuscescens) distributions in northern hardwood forests that are heavily ... Blue Warbler (Dendroica caerulescens; BTBW) and the Vee...
Language: English ...
