Dry Weights, Carbon and Nitrogen Content of Decapod Larvae from the Plankton

1998 ◽  
Vol 78 (1) ◽  
pp. 341-344 ◽  
Author(s):  
J.A. Lindley
Keyword(s):  
Carbon Content ◽  
Nitrogen Content ◽  
Carapace Length ◽  
C:N Ratio ◽  
Dry Weight ◽  
Published Data ◽  
Similar Data ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Content ◽  
Decapod Larvae

The carapace lengths, dry weights, carbon content and nitrogen content of decapod larvae sorted from fresh plankton samples were measured. Regressions for the relationships between dry weight and carapace length were determined for each infraorder and for lower taxa. Regressions between carbon content, nitrogen content and C:N ratio and dry weight were calculated for the different taxa and were compared with published data on larvae reared in the laboratory.Decapod larvae often comprise a significant component of the zooplankton of estuaries and inshore waters (Lindley et al., 1994). Lindley (1988) has presented data on the relationship between dry weight and carapace length for brachyuran larvae from the plankton. Similar data for other groups of decapods and additional data and analyses for brachyurans are presented here with data on carbon and nitrogen content. Anger & Harms (1990) described the relationships between dry weight; carbon and nitrogen content for decapod larvae reared under controlled conditions in the laboratory. The results of measurements on specimens caught in the plankton in naturally varying conditions provide a comparison with laboratory reared larvae. Harms et al. (1994) compared dry weights and biochemical data for Carcinus maenas (Brachyura) larvae reared in the laboratory with specimens from the plankton off Helgoland. Dry weights of the last two zoea stages and the megalopa larvae from the plankton were higher. The percentage carbon, nitrogen and lipid content were higher in laboratory raised larvae which were fed on Artemia nauplii than in field specimens or in laboratory reared specimens fed on phytoplankton or starved.

Biometrics, Carbon and Nitrogen Content in Two Cnidarians: Urticina Felina and Alcyonium Digitatum

1996 ◽  
Vol 76 (3) ◽  
pp. 595-602 ◽  
Author(s):  
A. Migné ◽  
D. Davoult ◽  
M.A. Janquin ◽  
A. Kupka
Keyword(s):  
Organic Carbon ◽  
Nitrogen Content ◽  
Dry Weight ◽  
Sea Anemones ◽  
Carbon And Nitrogen ◽  
Rapid Measurement ◽  
Constant Size ◽  
Linear Relationships ◽  
Carbon And Nitrogen Content ◽  
Biometrical Study

A biometrical study was conducted on two common cnidarians: Alcyonium digitatum (Octocorallia) and Urticina felina (Hexacorallia). The aim was to relate both the carbon and the nitrogen content of these species to a simple and rapid measurement. As the simplest measurement that can be done on A. digitatum is a measurement of size, relationships were determined between the height of a colony and its organic carbon (OC=0.0002 H2.0254, n=104, γ2=0·923) and nitrogen (N=0.00004 H2.0283, n=104, γ2=0.928) content. As no constant size could be determined on sea anemones, linear relationships were established between dry weight (DW) and organic carbon (OC=0.419 DW, n=65, r=0.995) and nitrogen (N=0.095 DW, n=65, r=0.997) content in U. felina. All these relationships were highly significant (P<0.1%) and appeared useful to express biomass of the two species in terms of carbon or nitrogen and then to consider dynamic processes such as respiration or excretion as fluxes of carbon and nitrogen.

Carbon and nitrogen content of Laminaria saccharina in the eastern English Channel: biometrics and seasonal variations

2001 ◽  
Vol 81 (5) ◽  
pp. 727-734 ◽  
Author(s):  
F. Gevaert ◽  
D. Davoult ◽  
A. Creach ◽  
R. Kling ◽  
M.-A. Janquin ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Seasonal Pattern ◽  
Dry Weight ◽  
Early Spring ◽  
English Channel ◽  
Laminaria Saccharina ◽  
Carbon And Nitrogen ◽  
Clear Seasonal Pattern ◽  
Total Dry Weight ◽  
Carbon And Nitrogen Content

Fresh weight (FW), dry weight (DW), carbon and nitrogen content were measured for specimens of Laminaria saccharina (Heterokontophyta: Phaeophyceae) sampled in the eastern English Channel in order to conduct a biometrical study. The aim was to relate carbon and nitrogen masses of the algae to a simple and rapid morphological measurement of the total length of the sporophyte. These relationships were highly significant and appeared very useful to express the standing biomass of L. saccharina in terms of carbon or nitrogen and then to consider dynamic processes such as primary production. Variations in tissue carbon (C) and nitrogen (N) were examined over a complete seasonal cycle. Average carbon and nitrogen content ranged from 23·9 to 31·4% and 2·23 to 3·42% of the total dry weight, respectively. Variations in C/N ratio showed a clear seasonal pattern with an increase in the early spring corresponding to strong photosynthesis and growth.

Dry Weight, Carbon and Nitrogen Content of Some Calanoid Copepods from the Seas Around Southern Britain in Winter

1997 ◽  
Vol 77 (1) ◽  
pp. 249-252 ◽  
Author(s):  
J.A. Lindley ◽  
A.W.G. John ◽  
D.B. Robins
Keyword(s):  
Nitrogen Content ◽  
Dry Weight ◽  
Irish Sea ◽  
Adult Males ◽  
Calanoid Copepods ◽  
Carbon And Nitrogen ◽  
Adult Females ◽  
Temora Longicornis ◽  
The Irish Sea ◽  
Carbon And Nitrogen Content

The dry weights, carbon and nitrogen content of fresh dried Calanus spp. Pseudocalanus elongatus, Acartia clausi, Temora longicornis, Mesocalanus teniricornis, Metridia lucens and Candacia armata were determined from samples taken in the southern North Sea, the English Channel, the Irish Sea and the Celtic Sea in December 1984 and February 1987. Usually adult females were picked out but some data were obtained for adult males and copepodites of Calanus spp. and T. longicornis and male M. tenuicornis. Significant differences were found between stations on the same cruise in the results for adult females of the same species. The weights of Calanus spp. females in February 1987 were found to be inversely related to temperature.

scholarly journals Influence of Land Use on the C and N Status of a C4 Invasive Grass in a Semi-Arid Region: Implications for Biomonitoring

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 942
Author(s):  
Edison A. Díaz-Álvarez ◽  
Erick de la Barrera
Keyword(s):  
Nitrogen Content ◽  
Dry Weight ◽  
Pollutant Emissions ◽  
Arid Environments ◽  
Invasive Grass ◽  
Nitrogen Emissions ◽  
Isotopic Signatures ◽  
Carbon And Nitrogen ◽  
Northwestern Mexico ◽  
Carbon And Nitrogen Content

Biomonitoring of atmospheric pollution is an increasingly accepted practice. However, most existing biomonitors are usually epiphytic species from mesic environments. This work assessed the suitability of buffelgrass (Cenchrus ciliaris), an invasive C4 grass in northwestern Mexico, as a biomonitor, by means of the spatial distribution of the carbon and nitrogen content and isotopic signatures for grass samples collected from urban, agricultural, and natural areas throughout the state of Sonora. We found the highest tissue carbon content of 45.6% (on a dry weight basis) and highest nitrogen content of 3.31% for buffelgrass from the Yaqui Valley. We also found the lowest δ13C of −15.9‰, and the highest δ15N of 16.7‰ in the same region. In contrast, the lowest carbon and nitrogen content of 39.4 and 1.49% were found for Bahía de Kino and Río Sonora mountains, respectively. The lowest δ15N of 2.18‰ and the highest δ13C of −13.7‰ were measured for two remote locations. These results show the influence that pollutant emissions, including agriculture and transportation, have on elemental and isotopic composition of vegetation. Buffelgrass is most adequate for tracking carbon and nitrogen emissions in arid environments and for determining alterations on nitrogen soil reactions, as a first approximation for saturation.

Biometrics, Carbon and Nitrogen Content in the Ophiuroid Ophiothrix Fragilis

1992 ◽  
Vol 72 (4) ◽  
pp. 915-918 ◽  
Author(s):  
D. Davoult ◽  
N. Degros ◽  
M. A. Janquín ◽  
B. Soyez
Keyword(s):  
Organic Matter ◽  
Nitrogen Content ◽  
Dry Weight ◽  
Pure Oxygen ◽  
Conversion Factors ◽  
Carbon And Nitrogen ◽  
Epifaunal Community ◽  
Wet Weight ◽  
Carbon And Nitrogen Content

Relationships between size, wet weight, dry weight, carbon and nitrogen content were determined in Ophiothrix fragilis (Echinodermata: Ophiuroidea). Such relationships appeared very useful when studying dynamic processes such as nutrition, growth, excretion or reproduction, considered as fluxes of carbon and nitrogen in the ecosystem.Relationships between size, wet weight, dry weight, ash free dry weight, carbon and nitrogen content of organisms are of fundamental interest in ecological studies of ecosystems. They allow us to understand and quantify the role of a species as it stores, consumes or produces organic matter during its life cycle. Determination of conversion factors are time-consuming but very useful for estimating flows in the ecosystem (Brey et al., 1988). Some compilations of conversion factors have been published (Båmstedt, 1981; Rumohr et al., 1987).Ophiothrix fragilis (Abildgaard) is the dominant species of the ‘pebbles with sessile epifaunal community’ (Davoult, 1990), located in the Dover Strait (eastern Channel), where tidal currents are very strong. It is considered as an efficient suspension feeder (Roushdy & Hansen, 1960; Warner, 1971) and lives in dense populations (1000–2000 individuals m-2; Davoult, 1989) which are assumed to have a significant effect on the fluxes of organic matter from the pelagic to the benthic system and on the fluxes of ammonium to the water column (Davoult et al., 1991).Individuals were sampled in May and June 1991 off the Cape Gris-Nez (50°55′N 1°35′E). Two-hundred individuals were measured (diameter ±01 mm, after Guille, 1964), dried at 60°C for 48 h, weighed (±0·1 mg), burnt at 520°C for 6 h (Anonymous, 1986), and the ash weighed (±0·1 mg). Total organic carbon and nitrogen content were determined with a CHN element analyser (Carlo Erba 1106): after a flash combustion in a helium stream temporarily enriched with pure oxygen, quantitative combustion was achieved by passing gases over Cr2O3 after a transfer through a reduction reactor to eliminate the excess of oxygen; components were separated in a chromato-graphic column, eluted, then measured by a thermal conductivity detector. Thirty-eight dried ophiuroids were ground with a micro-grinder, then two sub-samples (except for individuals <2 mm) were weighed at ±1 μg (76 measurements).

scholarly journals Role of carbon and nitrogen in the improvement of corrosion resistance of new powder metallurgy Co-Cr-Mo alloys

2020 ◽  
Vol 38 (3) ◽  
pp. 273-286 ◽  
Author(s):  
Cristina Garcia-Cabezon ◽  
Celia Garcia-Hernandez ◽  
Maria L. Rodriguez-Mendez ◽  
Gemma Herranz ◽  
Fernando Martin-Pedrosa
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Nitrogen Content ◽  
Powder Metallurgy Technique ◽  
Carbon And Nitrogen ◽  
Physiological Conditions ◽  
Carbon And Nitrogen Content ◽  
Astm F75

AbstractMicrostructural changes that result in relevant improvements in mechanical properties and electrochemical behavior can be induced using different sintering conditions of ASTM F75 cobalt alloys during their processing using powder metallurgy technique. It has been observed that the increase in carbon and nitrogen content improves corrosion resistance and mechanical properties as long as the precipitation of carbides and nitrides is avoided, thanks to the use of rapid cooling in water after the sintering stage. In addition, the reduction of the particle size of the powder improves hardness and resistance to corrosion in both acid medium with chlorides and phosphate-buffered medium that simulates the physiological conditions for its use as a biomaterial. These results lead to increased knowledge of the role of carbon and nitrogen content in the behavior displayed by the different alloys studied.

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