Phosphorus Regeneration by the Predatory Copepod Diacyclops thomasi

1986 ◽  
Vol 43 (2) ◽  
pp. 361-365 ◽  
Author(s):  
James A. Bowers
Keyword(s):  
Maximum Rate ◽  
Prey Density ◽  
Density Range ◽  
Zooplankton Species ◽  
Temperature Range ◽  
Herbivorous Zooplankton ◽  
Diacyclops Thomasi ◽  
Phosphorus Regeneration ◽  
Effects Of Temperature ◽  
Predation Rates

The effects of temperature, prey density, and hunger state on phosphorus regeneration rates of the predatory copepod Diacyclops thomasi were estimated while they fed on the limnetic rotifer Synchaeta pectinata. Regeneration rates increased linearly from 2.0 to 7.0 nmol P∙mg dry wt−1∙h−1 over a temperature range of 5–20 °C. When offered a prey density range of 100–500∙L−1, satiated Diacyclops increased their regeneration rates to a maximum of 5.0 nmol P∙mg dry wt−1∙h−1. Given the same prey density range, starved Diacyclops had regeneration rates that increased to a maximum rate of 8.0 nmol P∙mg dry wt−1∙h−1. Predation rates were in all cases directly proportional to regeneration rates. Although a predator, Diacyclops regenerates phosphorus at rates within the ranges of many herbivorous zooplankton species.

Critical constants and density dependence of the Lorenz–Lorentz coefficient for germane

1978 ◽  
Vol 56 (9) ◽  
pp. 1140-1141 ◽  
Author(s):  
P. Palffy-Muhoray ◽  
D. Balzarini
Keyword(s):  
Critical Temperature ◽  
Density Dependence ◽  
Experimental Error ◽  
Critical Density ◽  
Coexistence Curve ◽  
Index Of Refraction ◽  
Density Range ◽  
Temperature Range ◽  
Critical Constants

The index of refraction at 6328 Å has been measured for germane in the density range 0.15 to 0.9 g/cm3. The temperature and density ranges over which measurements are made are near the coexistence curve. The coefficient in the Lorenz–Lorentz expression, [Formula: see text], is constant to within 0.5% within experimental error for the temperature range and density range studied. The coefficient is slightly higher near the critical density. The critical density is measured to be 0.503 g/cm3. The critical temperature is measured to be 38.92 °C.

Effects of temperature on growth of north-east Pacific moon jellyfish ephyrae, Aurelia labiata (Cnidaria: Scyphozoa)

2005 ◽  
Vol 85 (3) ◽  
pp. 569-573 ◽  
Author(s):  
Chad L. Widmer
Keyword(s):  
Good Condition ◽  
Bell Diameter ◽  
Optimal Temperature ◽  
Moon Jellyfish ◽  
Poor Condition ◽  
Temperature Range ◽  
North East ◽  
East Pacific ◽  
Optimal Temperature Range ◽  
Effects Of Temperature

The effects of ten different water temperatures on the growth of newly released ephyrae of Aurelia labiata were explored. Ephyrae grown at 21°C showed the greatest growth, increasing in bell diameter from about 4.0 mm to 14.5 mm in 14 days and remained in good condition for the duration of the experiment. Ephyrae subjected to other temperatures grew at different rates. Ephyrae maintained at 8°C gradually decreased in size during the experiment, shrinking in bell diameter from about 4.0 mm to 3.8 mm by day 14, but remained in apparent good condition. Ephyrae reared at 22.5°C and above everted their bells, were in poor condition, and were unable to feed or swim effectively by about day ten. In this study the optimal temperature range for rearing A. labiata ephyrae was 12°C—21°C, which corresponds with the reported range for this species.

scholarly journals Effects of temperature, humidity, and diurnal temperature range on influenza incidence in a temperate region

2019 ◽  
Vol 14 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Ji‐Eun Park ◽  
Woo‐Sik Son ◽  
Yeonhee Ryu ◽  
Soo Beom Choi ◽  
Okyu Kwon ◽  
...  
Keyword(s):  
Diurnal Temperature Range ◽  
Temperate Region ◽  
Diurnal Temperature ◽  
Temperature Range ◽  
Effects Of Temperature

Predation of Indianmeal Moth Larvae by Lyctocoris campestris (F.) (Hemiptera: Anthocoridae) in Different Stored Commodities

1997 ◽  
Vol 32 (3) ◽  
pp. 271-280 ◽  
Author(s):  
R. L. Meagher ◽  
L. A. Locke
Keyword(s):  
Functional Response ◽  
Prey Density ◽  
Plodia Interpunctella ◽  
Type Ii ◽  
Indianmeal Moth ◽  
Whole Wheat ◽  
Late Instar ◽  
Response Equation ◽  
Predation Rates ◽  
Type Ii Functional Response

Predation rates for the anthocorid predator Lyctocoris campestris (F.) against varying densities of late-instar Plodia interpunctella (Hübner) were compared in whole corn, whole wheat, or rolled oat stored commodities. More prey were attacked in corn and wheat than in oats, and female predators generally fed on more larvae than did male predators. Predation increased with an increase in prey density. This relationship was best described by a Type II functional response equation. Our results suggest that commodity type affects the number of prey attacked by this predator.

Kinetic Characteristics of Si3N4 CVD

1991 ◽  
Vol 250 ◽  
Author(s):  
W. Y. Lee ◽  
J. R. Strife ◽  
R. D. Veltri
Keyword(s):  
Deposition Rate ◽  
Mass Spectroscopy ◽  
Flow Rate ◽  
Molar Ratio ◽  
Kinetic Characteristics ◽  
Temperature Range ◽  
Time Flow ◽  
Effects Of Temperature ◽  
Temperature Time

AbstractThe CVD of Si3N4 from SiF4 and NH3 gaseous precursors was studied using a hotwall reactor in the temperature range of 1340 to 1490°C. The effects of temperature, time, flow rate, and SiF4/NH3 molar ratio on deposition rate and axial and radial deposition profiles were identified. The decomposition characteristics of pure NH3 and SiF4 were studied utilizing mass spectroscopy and compared to thermodynamic predictions.

On the Effect of Strain Rate and Temperature on the Yield Strength Anomaly in L21-structured Fe2AlMn

2008 ◽  
Vol 1128 ◽  
Author(s):  
Markus W. Wittmann ◽  
Janelle M. Chang ◽  
Yifeng Liao ◽  
Ian Baker
Keyword(s):  
Yield Strength ◽  
Strain Rate ◽  
Single Crystals ◽  
Yield Stress ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Temperature Range ◽  
Effects Of Temperature ◽  
Increasing Temperature

AbstractThe effects of strain rate and temperature on the yield strength of near-stoichiometric Fe2AlMn single crystals were investigated. In the temperature range 600-800K the yield stress increased with increasing temperature, a response commonly referred to as a yield strength anomaly. No strain rate sensitivity was observed below 750K, but at higher temperatures the yield stress increased with increasing strain rate. Possible mechanisms to explaining the effects of temperature and strain rate are discussed.

scholarly journals Factors influencing the predation rates of Anisops breddini (Hemiptera: Notonectidae) feeding on mosquito larvae

2014 ◽  
Vol 46 (3) ◽  
pp. 107 ◽  
Author(s):  
R. Weterings ◽  
K.C. Vetter ◽  
C. Umponstira
Keyword(s):  
Biological Control ◽  
Urban Areas ◽  
Prey Density ◽  
Biological Control Agent ◽  
Prey Type ◽  
Control Agent ◽  
Mosquito Larvae ◽  
Predator Density ◽  
Water Bugs ◽  
Predation Rates

Notonectidae are a family of water bugs that are known to be important predators of mosquito larvae and have great potential in the biological control of vector mosquitoes. An experiment was conducted to assess mosquito larvae predation by <em>Anisops</em> <em>breddini</em>, a species common to Southeast Asia. The predation rates were recorded in context of prey density, predator density, predator size and prey type. Predation rates were strongly affected by prey type and less by prey density and predator density. They ranged between 1.2 prey items per day for pupae of <em>Aedes</em> <em>aegeypti</em> and <em>Armigeres</em> <em>moultoni</em> to 5.9 for <em>Ae</em>. <em>aegypti</em> larvae. Compared with studies on other Notonectidae species, the predation rates appear low, which is probably caused by the relative small size of the specimens used in this study. <em>An</em>. <em>breddini</em> is very common in the region and often found in urban areas; therefore, the species has potential as a biological control agent.

COMPARISON OF PREDATION RATES

1981 ◽  
Vol 113 (11) ◽  
pp. 1047-1048 ◽  
Author(s):  
N. Gilbert
Keyword(s):  
Survival Rate ◽  
Prey Density ◽  
Time Interval ◽  
Search Rate ◽  
Time Period ◽  
Demand Rate ◽  
Predation Rates

Consider a predator which, when hungry, has a discovery rate (= search rate × probability of finding prey) of a prey per unit time. When satiated, its demand rate for prey is 1/T, where T is the time-interval between successive prey captures when the predator is surrounded by excess of prey. Both a and T may vary with temperature, etc. Let s(N) be the expression for prey survival rate, during an infinitesimal time-period dt, as a function of prey density N.

Photoperiodic Time Measurement and Effects of Temperature on Flowering in Chenopodium rubrum L

1979 ◽  
Vol 6 (3) ◽  
pp. 417 ◽  
Author(s):  
RW King
Keyword(s):  
Floral Induction ◽  
Temperature Shift ◽  
Time Measurement ◽  
Pharbitis Nil ◽  
Temperature Sensitive ◽  
Hyoscyamus Niger ◽  
Temperature Range ◽  
Critical Daylength ◽  
Effects Of Temperature ◽  
Two Parameters

The critical dark period length (c. 8 h darkness) required for induction of flowering of C. rubrum is insensitive to temperature (Q10 c. 1.0) over the temperature range 10-25°C. However, the period of a rhythm controlling floral induction is shown to be temperature sensitive (Q10 c. 1.4) over the temperature range 9-22°C. The discrepancy in temperature dependence of these two parameters of photoperiodic time-measurement could reflect differences in their rates of adjustment after a temperature shift. By contrast, at least two other species (Pharbitis nil and Hyoscyamus niger) show marked temperature sensitivity of their critical daylength. Thus, there may be more than one time- keeper in the photoperiodic control of flowering.

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