An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
... Petroleum hydrocarbon contamination of groundwater and soil constitutes a serious threat to human health and the natural environment. In situ biodegradation is a low-cost, low-risk and effective technique to remove petroleum hydrocarbon contaminants. The concentrations of total petroleum hydrocarbons (TPH), dissolved inorganic carbon (DIC) and [Formula: see text] were analyzed, and polymerase chai ...
... Conservation agriculture is a sustainable alternative to conventional agriculture. However, little is known about their effect on the environment and on the soil microbial community. It was established as a hypothesis that the bacterial community structure would be defined by the different agronomic practices. The objective of this study was, therefore, to investigate how crop residue management, ...
Bacillariophyceae; DNA; biofilm; carbon; community structure; data analysis; databases; genes; marine environment; oxidants; photosynthesis; plankton; ribosomal RNA; seawater; steel; sulfur; Gulf of Guinea
Abstract:
... 16S rRNA gene profiling using a pipeline involving the Greengenes database revealed that bacterial populations in innermost (proximal to the steel surface) and outer regions of biofilms on carbon steel exposed 3 m below the surface at an offshore site in the Gulf of Guinea differed from one another and from seawater. There was a preponderance of gammaproteobacterial sequences, representing organis ...
Galaxias platei; Salmonidae; community structure; environmental factors; fish; habitats; hydroelectric power; models; power plants; rivers; shorelines; streams; Chile
Abstract:
... The mesoscale (10⁰–10² m) of river habitats has been identified as the scale that simultaneously offers insights into ecological structure and falls within the practical bounds of river management. Mesoscale habitat (mesohabitat) classifications for relatively large rivers, however, are underdeveloped compared with those produced for smaller streams. Approaches to habitat modelling have traditiona ...
Formicidae; biomass; birds; canopy; community structure; drought; dung beetles; fauna; humans; land management; lianas; planning; plant communities; plant litter; saplings; species diversity; tropical forests; wildfires; Amazonia
Abstract:
... In the last decades, due to human land management that uses fire as a tool, and due to abnormal droughts, many tropical forests have become more susceptible to recurrent wildfires with negative consequences for biodiversity. Yet, studies are usually focused on few taxa and rarely compare different fire frequencies. We examined if the effects of single and recurrent fires are consistent for leaf li ...
Plecoptera; Trichoptera; community structure; data collection; ecoregions; macroinvertebrates; screening; streams; stress response; summer; United States
Abstract:
... A macroinvertebrate multimetric index is an effective tool for assessing the biological integrity of streams. However, data collected under a single protocol may not be available for an entire region. We sampled macroinvertebrates from the full extent of the Sand Hills ecoregion Level IV of the Southeastern Plains with a standard protocol during the summers of 2010–2012. We evaluated the performan ...
Croton; Garcinia; Hyphaene; Syzygium; Vachellia; body water; cluster analysis; community structure; floodplains; forests; indicator species; monitoring; plant communities; riparian areas; species diversity; surface water; woodlands; Botswana
Abstract:
... In the Okavango Delta information on the riparian woodland vegetation community composition and distribution is generally lacking. Past studies in the Delta were mainly focused on the quantitative classification of seasonal floodplain herbaceous vegetation communities. The aim of this study was to determine riparian woodland vegetation communities in the Okavango Delta. Vegetation sampling was con ...
N. Cid; I. Verkaik; E.M. García-Roger; M. Rieradevall; N. Bonada; M.M. Sánchez-Montoya; R. Gómez; M.L. Suárez; M.R. Vidal-Abarca; D. Demartini; A. Buffagni; S. Erba; I. Karaouzas; N. Skoulikidis; N. Prat
... Many streams in the Mediterranean Basin have temporary flow regimes. While timing for seasonal drought is predictable, they undergo strong inter-annual variability in flow intensity. This high hydrological variability and associated ecological responses challenge the ecological status assessment of temporary streams, particularly when setting reference conditions. This study examined the effects o ...
... Animal pollinators mediate reproduction of many plant species. Foraging theory suggests that animal pollinators exhibit preferences for common plant species in natural communities (positive frequency‐dependent foraging) and temporary single‐species specialization (flower constancy) during foraging bouts. Positive frequency dependence may favor common plant species; flower constancy may enhance con ...
... It has been documented that human activities are causing the rapid loss of taxonomic, phylogenetic, genetic and functional diversity in soils. However, it remains unclear how modern intensive rice cultivation impacts the soil microbiome and its functionality. Here we examined the microbial composition and function differences between a buried Neolithic paddy soil and an adjacent, currently-cultiva ...
... Soil pH has been suggested as one of the most important factors affecting the ecological characteristics of soil ammonia-oxidizers (AO), which mediate the conversion of ammonia to nitrate via nitrite and contribute significantly to the leaching of nitrate to groundwater and the production of atmospheric nitrous oxide (N₂O). However, the dynamics of the AO community in acidic purple soils, which ar ...
soil ecology; ant nests; community structure; niches; mites; soil; Sarcoptiformes; biodiversity; Formica polyctena; fauna; forests
Abstract:
... Ant nests are also inhabited by other invertebrates, ant associates. The oribatid mite (Acari: Oribatida) fauna of nests is poorly known, both in terms of abundance and diversity. We compared the oribatid assemblages within and outside red wood ant Formica polyctena nests in a Finnish oak forest. Altogether ten mounds were investigated and comparable samples were collected from adjacent soil 4 m f ...
... The aim of this study was to gain an understanding of the effects of mariculture on the bacterial communities in a co-culture pond, which is a popular culture model for shrimp, crab, and shellfish along the eastern coast of China. Six seawater samples were collected from a pond with cultures of shrimp, crab, and shellfish, and six other samples were collected from a non-cultured pond (control). Th ...
agri-environmental policy; botanical composition; community structure; cost effectiveness; farms; habitats; meadows; Europe
Abstract:
... Semi-natural grassland habitats have declined significantly throughout Europe. To halt the decline, grassland conservation measures have been included in most European agri-environment schemes. This is the first study to compare the botanical composition of grassland habitats managed under the Irish Agri-Environment Options Scheme (AEOS). Sixty fields on drystock pastoral farms in receipt of agri- ...
Archaea; bacteria; cecum; colon; community structure; denaturing gradient gel electrophoresis; feces; hindgut; horses; methanogens; microbial communities; models; quantitative polymerase chain reaction; ribosomal DNA
Abstract:
... The microbial profiles of the luminal content of five hindgut segments of one healthy horse were compared with rectal sample to elucidate the effect of anatomical region on bacterial and archaeal community structure and to evaluate the use of faeces as a representative model of large intestine. The qualitative and quantitative changes of the microbial community composition of caecum, right ventral ...
Cladocera; Copepoda; aquatic ecosystems; aquatic habitat; body size; carbon; community structure; data collection; databases; ecologists; freshwater; lipids; meta-analysis; metabolism; models; nitrogen; phosphorus; protein content; respiratory rate; zooplankton
Abstract:
... This data compilation synthesizes 8609 individual observations and ranges of 13 traits from 201 freshwater and 191 marine crustacean taxa belonging to either Copepoda or Cladocera, two important zooplankton groups across all major aquatic habitats. Most data were gathered from the literature, with the balance being provided by zooplankton ecologists. With the aim of more fully assessing zooplankto ...
autocorrelation; case studies; community structure; ecosystems; habitats; land use change; plant communities; simulation models; variance
Abstract:
... Functional trait diversity is a popular tool in modern ecology, mainly used to infer assembly processes and ecosystem functioning. Patterns of functional trait diversity are shaped by ecological processes such as environmental filtering, species interactions and dispersal that are inherently spatial, and different processes may operate at different spatial scales. Adding a spatial dimension to the ...
Acaulospora; Claroideoglomus; algorithms; community structure; data collection; databases; environmental factors; genes; mycorrhizal fungi; phylogeny; polymerase chain reaction; potatoes; ribosomal RNA; root systems; roots; sequence homology; sustainable agriculture; vesicular arbuscular mycorrhizae; Andes region
Abstract:
... Plant-symbiotic arbuscular mycorrhizal fungi (AMF) are of high global ecological and economic importance, but describing environmental communities of AMF at the species level remains a challenge, despite the need to understand AMF-plant preferences and to apply AMF in sustainable agriculture. Here, the potato-associated AMF species community composition was assessed for three Andean countries alon ...
... We describe an accurate and efficient workflow for highly multiplexed paired-end Illumina sequencing of fungal full-length ITS amplicons. The impact of habitat and substratum conditions on leaf-inhabiting fungal communities was analysed. Fully vital and clearly senescent leaves of European beech (Fagus sylvatica) were sampled along an elevation gradient of about 1000 m in the Bavarian Alps, German ...
... BACKGROUND AND AIMS: The need for efficient use of phosphorus (P) in agriculture has been highlighted recently by concerns about the finite amount of P fertilizer resources. However, in the Taihu Lake Region (TLR) of China, farmers’ injudicious and excessive use of P fertilizer has led to a dramatic spike in P accumulation. METHODS: A five-year (ten consecutive crop seasons) pot experiment was con ...