scholarly journals Influence of different riparian vegetation widths and substrate types on the communities of larval Odonata (Insecta) in southern Brazilian streams

2020 ◽  
Vol 32 ◽  
Author(s):  
Mateus Marques Pires ◽  
Nícolas Felipe Drumm Müller ◽  
Cristina Stenert ◽  
Leonardo Maltchik
Keyword(s):  
Community Structure ◽  
Riparian Vegetation ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Substrate Type ◽  
Insect Communities ◽  
Odonate Larvae ◽  
Influence Of Substrate ◽  
Forest Streams ◽  
Substrate Types

Abstract: Aim We assessed the influence of substrate type and categories of riparian vegetation widths on the community structure of Odonata (Insecta) in southern Brazilian streams. Methods Sampling took place in twelve stream reaches differing in their riparian vegetation widths (from more than 40 m up to less than 5 m). Larval odonates were collected in inorganic (stone and gravel) and organic (leaf litter) substrates at each stream reach. Differences in Odonata composition among substrates and categories of riparian vegetation width were tested using PERMANOVA and visualized with ordination diagrams. In addition, we assessed the influence of riparian vegetation width taking into account two levels of resolutions: fine (four categories: > 40 m, 30-15 m, 15-5 m and < 5 m) and coarse (narrower and broader than 15 m). Results Odonata composition differed more strongly according to substrate type regardless of the level of resolution. Organic substrate (litter) had different composition and higher richness than inorganic ones. Odonata composition significantly differed between riparian vegetation widths at the coarser level of resolution (narrower and broader than 15 m); at the coarser level, the interaction between substrate and riparian widths was significant, with the composition from litter substrate in broader widths differing from stone and gravel in narrower widths. Conclusions The composition of odonate larvae responded to the major reductions in riparian widths (above > 15 m), indicating that reductions above this level are enough to affect the community structure of Odonata. Additionally, the different composition of Odonata in organic substrates in broader riparian vegetation widths compared to inorganic substrates in narrower widths indicate a complex relationship between riparian vegetation and substrate in the assembly of insect communities in southern Brazilian forest streams. The interaction between riparian vegetation widths and substrate suggests that the effects of reductions in riparian widths on Odonata composition are not similar across substrate types.

Effect of continuous addition of an organic substrate to the anoxic phase on biological phosphorus removal

1998 ◽  
Vol 38 (1) ◽  
pp. 97-105 ◽  
Author(s):  
J. Meinhold ◽  
H. Pedersen ◽  
E. Arnold ◽  
S. Isaacs ◽  
M. Henze
Keyword(s):  
Phosphorus Removal ◽  
Phosphate Uptake ◽  
P Uptake ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Biological Phosphorus Removal ◽  
P Release ◽  
Influence Of Substrate ◽  
Biological Phosphorus ◽  
P Removal

The continuous introduction of a biological phosphorus removal (BPR) promoting organic substrate to the denitrifying reactor of a BPR process is examined through a series of batch experiments using acetate as model organic substrate. Several observations are made regarding the influence of substrate availability on PHA storage/utilization and phosphate uptake/release. Under anoxic conditions PHB is utilized and phosphate is taken up, indicating that at least a fraction of the PAO can denitrify. The rates of anoxic P-uptake, PHB utilization and denitrification are found to increase with increasing initial PHB level. At low acetate addition rates the P-uptake and PHB utilization rates are reduced compared to when no acetate is available. At higher acetate addition rates a net P-release occurs and PHB is accumulated. For certain intermediate acetate addition rates the PHB level can increase while a net P-release occurs. Whether the introduction of BPR promoting organic substrates to the denitrifying reactor is detrimental to overall P-removal appears to be dependent on the interaction between aerobic P-uptake, which is a function of PHB level, and the aerobic residence time.

Effects of riparian vegetation width and substrate type on riffle beetle community structure

2017 ◽  
Vol 21 (1) ◽  
pp. 66-75 ◽  
Author(s):  
Bruna M. Braun ◽  
Mateus M. Pires ◽  
Cristina Stenert ◽  
Leonardo Maltchik ◽  
Carla B. Kotzian
Keyword(s):  
Community Structure ◽  
Riparian Vegetation ◽  
Substrate Type

scholarly journals Carbon Amendments Alter Microbial Community Structure and Net Mercury Methylation Potential in Sediments

2017 ◽  
Vol 84 (3) ◽  
Author(s):  
Geoff A. Christensen ◽  
Anil C. Somenahally ◽  
James G. Moberly ◽  
Carrie M. Miller ◽  
Andrew J. King ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
16S Rrna ◽  
Electron Acceptor ◽  
Microbial Community Structure ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Content Type ◽  
Oak Ridge ◽  
The Impact

ABSTRACTNeurotoxic methylmercury (MeHg) is produced by anaerobicBacteriaandArchaeapossessing the geneshgcAB, but it is unknown how organic substrate and electron acceptor availability impacts the distribution and abundance of these organisms. We evaluated the impact of organic substrate amendments on mercury (Hg) methylation rates, microbial community structure, and the distribution ofhgcAB+microbes with sediments. Sediment slurries were amended with short-chain fatty acids, alcohols, or a polysaccharide. Minimal increases in MeHg were observed following lactate, ethanol, and methanol amendments, while a significant decrease (∼70%) was observed with cellobiose incubations. Postincubation, microbial diversity was assessed via 16S rRNA amplicon sequencing. The presence ofhgcAB+organisms was assessed with a broad-range degenerate PCR primer set for both genes, while the presence of microbes in each of the three dominant clades of methylators (Deltaproteobacteria,Firmicutes, and methanogenicArchaea) was measured with clade-specific degeneratehgcAquantitative PCR (qPCR) primer sets. The predominant microorganisms in unamended sediments consisted ofProteobacteria,Firmicutes,Bacteroidetes, andActinobacteria. Clade-specific qPCR identifiedhgcA+DeltaproteobacteriaandArchaeain all sites but failed to detecthgcA+Firmicutes. Cellobiose shifted the communities in all samples to ∼90% non-hgcAB-containingFirmicutes(mainlyBacillusspp. andClostridiumspp.). These results suggest that either expression ofhgcABis downregulated or, more likely given the lack of 16S rRNA gene presence after cellobiose incubation, Hg-methylating organisms are largely outcompeted by cellobiose degraders or degradation products of cellobiose. These results represent a step toward understanding and exploring simple methodologies for controlling MeHg production in the environment.IMPORTANCEMethylmercury (MeHg) is a neurotoxin produced by microorganisms that bioacummulates in the food web and poses a serious health risk to humans. Currently, the impact that organic substrate or electron acceptor availability has on the mercury (Hg)-methylating microorganisms is unclear. To study this, we set up microcosm experiments exposed to different organic substrates and electron acceptors and assayed for Hg methylation rates, for microbial community structure, and for distribution of Hg methylators. The sediment and groundwater was collected from East Fork Poplar Creek in Oak Ridge, TN. Amendment with cellobiose (a lignocellulosic degradation by-product) led to a drastic decrease in the Hg methylation rate compared to that in an unamended control, with an associated shift in the microbial community to mostly nonmethylatingFirmicutes. This, along with previous Hg-methylating microorganism identification methods, will be important for identifying strategies to control MeHg production and inform future remediation strategies.

Dynamics of phosphorus and organic substrates in anaerobic and aerobic phases of a sequencing batch reactor

1994 ◽  
Vol 30 (6) ◽  
pp. 237-246 ◽  
Author(s):  
A. Carucci ◽  
M. Majone ◽  
R. Ramadori ◽  
S. Rossetti
Keyword(s):  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
General Assumption ◽  
Organic Substrate ◽  
Operating Conditions ◽  
Phosphate Removal ◽  
Substrate Uptake ◽  
Organic Substrates ◽  
Polyphosphate Metabolism

This paper describes a lab-scale experimentation carried out to study enhanced biological phosphate removal (EBPR) in a sequencing batch reactor (SBR). The synthetic feed used was based on peptone and glucose as organic substrate to simulate the readily biodegradable fraction of a municipal wastewater (Wentzel et al., 1991). The experimental work was divided into two runs, each characterized by different operating conditions. The phosphorus removal efficiency was considerably higher in the absence of competition for organic substrate between P-accumulating and denitrifying bacteria. The activated sludge consisted mainly of peculiar microorganisms recently described by Cech and Hartman (1990) and called “G bacteria”. The results obtained seem to be inconsistent with the general assumption that the G bacteria are characterized by anaerobic substrate uptake not connected with any polyphosphate metabolism. Supplementary anaerobic batch tests utilizing glucose, peptone and acetate as organic substrates show that the role of acetate in the biochemical mechanisms promoting EBPR may not be so essential as it has been assumed till now.

Influence of substrate type and film thickness on the failures of Zr-based thin-film metallic glass under nanoscratch

Wear ◽  
2022 ◽  
pp. 204241
Author(s):  
Karuppasamy Pandian Marimuthu ◽  
Uihwan Jeong ◽  
Jungmoo Han ◽  
Giyeol Han ◽  
Hyungyil Lee
Keyword(s):  
Thin Film ◽  
Metallic Glass ◽  
Film Thickness ◽  
Substrate Type ◽  
Influence Of Substrate

scholarly journals Bi2Te3 and Sb2Te3 Thin Films with Enhanced Thermoelectric Properties for Flexible Thermal Sensors

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 815
Author(s):  
Eliana Vieira ◽  
Joana Figueira ◽  
Ana Lucia Pires ◽  
José Grilo ◽  
Manuel Fernando Silva ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Thermal Sensors ◽  
Substrate Type ◽  
Influence Of Substrate ◽  
Thermopile Sensor

The influence of substrate type in boosting thermoelectric properties of co-evaporated Bi2Te3 and Sb2Te3 films (with 400 nm-thick) is here reported. Optimized power factor values are 2.7 × 10−3 W K−2 m−1 and 1.4 × 10−3 W K−2 m−1 for flexible Bi2Te3 and Sb2Te3 films, respectively. This is an important result as it is at least 2 times higher than the power factor found in the literature for flexible Bi2Te3 and Sb2Te3 films. A flexible infrared thermopile sensor was developed with high detectivity (2.50 × 107 cm √HzW−1).

scholarly journals The influence of substrate type and chlormequat on the growth and flowering of marigold (Tagetes L.)

2017 ◽  
Vol 29 (2) ◽  
pp. 189-198 ◽  
Author(s):  
Małgorzata Maślanka ◽  
Renata Magdziarz
Keyword(s):  
Foliar Spray ◽  
The Other ◽  
Tagetes Erecta ◽  
Tagetes Patula ◽  
Substrate Type ◽  
Influence Of Substrate

AbstractThis study was conducted to investigate the effect of various horticultural substrates (compost, peat-coconut, peat TS1, flower soil, lowmoor peat) and a foliar spray of chlormequat (at a concentration of 1380 mg dm-3) on the growth and flowering of the marigold cultivars belonging to two species: Tagetes erecta - ʻMarvel Mixtureʼ and ʻTaishan Orangeʼ, and Tagetes patula - ʻDurango Redʼ and ʻBonanza Flameʼ. The obtained results show that the plants grown in peat TS1 and peat-coconut were taller, had longer internodes and leaves, and thicker stems than the plants grown in the other substrates. Chlormequat significantly reduced the height of ʻMarvel Mixtureʼ (in peat TS1), ʻTaishan Orangeʼ (in lowmoor peat) and ‘Bonanza Flameʼ (in peat-coconut). The use of chlormequat also accelerated the development of flower heads in ʻTaishan Orangeʼ (in lowmoor peat).

scholarly journals Study on evaluating the effectiveness of compost fertilizer from jackfruit peel and fiber with various local agricultural materials on Green Mustard (Brassica juncea)

2021 ◽  
Vol 332 ◽  
pp. 07001
Author(s):  
Thanh Tran ◽  
Van Thi ◽  
Tran Thi Bich Phuong ◽  
Loc Huu Ho ◽  
Le Thi Anh Hong
Keyword(s):  
Germination Rate ◽  
Organic Fertilizer ◽  
Control Sample ◽  
Organic Substrate ◽  
National Standards ◽  
Organic Carbon Content ◽  
Organic Substrates ◽  
Coconut Fiber ◽  
Three Samples ◽  
Agricultural Materials

In recent years, jackfruit production in Vietnam has been growing very strongly in both quantity and quality. However, most of the jackfruit is harvested and processed for meat, the rest is the jackfruit peels, and fibers are discarded, which will affect environmental sanitation. The study aims to enhance the value of jackfruit by taking advantage of nutrient ingredients in the peel and fiber of jackfruit to blend into organic fertilizer. Initial results show that the compost substrate samples mixed with rice husk ash and coir and the organic substrate sample mixed with coconut fiber had the best quality. Tested nutritional ingredients include including humidity is 76.1%, total organic carbon content is 27.3%, fulvic acid is 0.9%, humid acid is 0.9%, total nitrogen is 0.85%, total phosphorus is 0.57% after 35 days of incubation. Their quality meets the national standards of QCVN 01-189: 2019/BNNPTNT on fertilizer quality. After testing all three samples of organic substrates on the green mustard with germination rate (%), a number of branches, and total fresh weight (g), the results showed that test plants are grown with the compost from the shell - jackfruit fiber mixed with coconut fiber developed better than the control sample.

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