PubAg

Main content area

You searched for: Subject "respiratory rate" Remove constraint Subject: "respiratory rate"
Start Over

Search

2,056  Search Results

« Previous | 1 - 20 of 2,056 |
Number of results to display per page

Search Results

1. Effect of age and sex on oxygen uptake by adult mosquitoes

Author:
BAT-MIRIAM, MARIASSA; GALUN, RACHEL
Source:
Entomologia experimentalis et applicata 1962 v.5 no.4 pp. 244-248
ISSN:
0013-8703
Subject:
respiratory rate,   etc   ; Culicidae; body weight; females; imagos; males; metabolism; oxygen; temperature;     Show all 9 Subjects
Abstract:
... Newly emerged mosquitoes show a low respiratory rate which increases during the first two days of adult life. On the fourth day a temporary decrease occurs, after which there is no correlation between age and oxygen uptake. Males show a higher metabolic rate (calculated per mg body weight) than females at all temperatures studied. ...
DOI:
10.1111/j.1570-7458.1962.tb00587.x

2. Comparative Photosynthetic and Respiratory Responses to Temperature and Light by Pseudotsuga Menziesii Var. Menziesii and Var. Glauca Seedlings

Author:
Krueger, Kenneth W.; Ferrell, William K.
Source:
Ecology 1965 v.46 no.6 pp. 794-801
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Pseudotsuga menziesii; islands; light intensity; lighting; photosynthesis; seedlings; temperature; Montana;     Show all 9 Subjects
Abstract:
... Douglas—fir seedlings of the geographic varieties menziesii and glauca were grown from seed collection from southern Vancouver Island, B. C., and western Montana. Photosynthetic and respiratory rates were compared for a range of temperatures, light intensities, and under constant high—intensity illumination. Maximum apparent photosynthesis occurred near temperatures of 20 degrees—25 degrees C for ...
DOI:
10.2307/1934011

3. Rates of Carbon Dioxide Evolution From the Forest Floor

Author:
Witkamp, Martin
Source:
Ecology 1966 v.47 no.3 pp. 492-494
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; age; bags; carbon dioxide production; floors; forest litter; leaves; temperature;     Show all 8 Subjects
Abstract:
... Evolution of CO₂ from the forest floor measured by the inverted—box method was related to moisture, temperature, and age of the litter, and to CO₂ evolution from oak leaves in litter bags measured by the closed—box method. Rates of CO₂ evolution measured by the inverted— and closed—box methods did not differ significantly (P>0.2). Respiration rates from bagged oak leaves were significantly correla ...
DOI:
10.2307/1932992

4. Some Factors Affecting Respiration of Periphyton Communities in Lotic Environments

Author:
McIntire, C. David
Source:
Ecology 1966 v.47 no.6 pp. 918-930
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; air; aquatic plants; containers; dissolved oxygen; lotic systems; oxygen; periphyton; streams;     Show all 9 Subjects
Abstract:
... Laboratory streams, a 509—liter respirometer chamber, and a Gilson differential respirometer were used to study factors influencing rates of periphyton respiration in lotic environments. Rates of respiration, expressed on an ash—free dry weight basis, determined for sections of intact communities in air—saturated water, varied between 0.8 mg O₂/g hr at 7.2°C and 2.3 mg O₂/g hr at 18.6°C for a comm ...
DOI:
10.2307/1935639

5. Wintertime Photosynthesis of Bristlecone Pine (Pinus Aristata) In the White Mountains of California

Author:
Schulze, E. D.; Mooney, H. A.; Dunn, E. L.
Source:
Ecology 1967 v.48 no.6 pp. 1044-1047
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Pinus aristata; autumn; carbon dioxide; cold; mountains; photosynthesis; soil; spring; summer; temperature; treeline; winter; California;     Show all 14 Subjects
Abstract:
... Winter rates of photosynthesis and respiration in bristlecone pine were measured at controlled temperatures at 3,094 m elevation. Following the onset of severely cold temperatures in autumn, net photosynthesis declined sharply. By midwinter net photosynthesis became zero and remained there through early spring; during this time only low gross photosynthesis could be measured. Respiration rates rem ...
DOI:
10.2307/1934564

6. Field and Experimental Winter Limnology of Three Colorado Mountain Lakes

Author:
Pennak, Robert W.
Source:
Ecology 1968 v.49 no.3 pp. 505-520
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Bacillariophyceae; Copepoda; Cyanobacteria; Rotifera; adults; algae; anaerobiosis; antibiotic resistance; antibiotics; bacteria; basins; eutrophication; field experimentation; heat; lakes; limnology; molds (fungi); mutants; nutrient availability; photosynthesis; plankton; refrigerators; seasonal variation; snow; snowpack; temperature; trout; winter; yeasts; Colorado;     Show all 31 Subjects
Abstract:
... Physical, chemical, and plankton conditions were studied during two winters in three Colorado mountain lakes. Black Lake is mesotrophic, Pass Lake is highly oligotrophic, and Tea Lake is shallow, eutrophic, and pondlike. The lower waters of Black and Pass lakes absorb heat from the basin so that their winter temperatures are above 4.0°C and as high as 5.4°C. The substrate and bottom waters reach e ...
DOI:
10.2307/1934117

7. Ecology of Two Populations of an Aquatic Isopod, Lirceus Fontinalis Raf

Author:
Styron, C. E.
Source:
Ecology 1968 v.49 no.4 pp. 629-636
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Lirceus; anaerobic conditions; drought; ecotypes; gamma radiation; predators; races; rivers; streams; temperature; Georgia;     Show all 12 Subjects
Abstract:
... Two populations of Lirceus fontinalis Rafinesque in DeKalb County, Georgia are isolated in separate river drainages and evolving in response to different environmental stresses. Drought and high temperatures seem the main ecological factors limiting the population on Mount Arabia. These factors are of little moment to the population in Lullwater Creek where biotic factors are of primary ecological ...
DOI:
10.2307/1935528

8. The Transformation of Energy by a Stream Detritivore, Pteronarcys Scotti (Plecoptera)

Author:
McDiffett, Wayne F.
Source:
Ecology 1970 v.51 no.6 pp. 975-988
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Pteronarcys; body weight; calorimetry; detritivores; energy conversion; energy metabolism; exoskeleton; feces; leaves; nymphs; photoperiod; statistical analysis; streams; temperature; trout; Georgia;     Show all 17 Subjects
Abstract:
... The bioenergetics of a detritus—feeding stonefly Pteronarcys scotti, were invetigated. The nymphs were collected from a north Georgia trout stream and held under simulated field conditions of temperature and photoperiod in a laboratory stream. Rates of respiration and egestion were measured at temperatures approximating those in the field at the time of collection. An estimate of the growth rate o ...
DOI:
10.2307/1933624

9. Biomass Turnover, Respiration, and Interpopulation Variation in the Stream Limpet Ferrissia rivularis (Say)

Author:
Burky, Albert J.
Source:
Ecological monographs 1971 v.41 no.3 pp. 235-251
ISSN:
0012-9615
Subject:
respiratory rate,   etc   ; acclimation; adults; autumn; biomass; breeding; carbon; carbon nitrogen ratio; cell respiration; egg production; eggs; energy balance; eutrophication; genetic variation; limpets; longevity; metabolism; oviposition; oxygen consumption; primary productivity; spring; streams; summer; temperature; winter; New York;     Show all 26 Subjects
Abstract:
... The stream limpet Ferrissia rivularis, which occurs extensively in North America and is ubiquitous in streams of upper New York State, was studied from two distinct populations, one located in the Canandaigua Outlet at Alloway, N. Y. (AL) and the other in Black Creek at Cleveland, N. Y. (BC). These environments differ substantially, that at AL being the more eutrophic. At BC there is one generatio ...
DOI:
10.2307/1942367

10. Energetics and Population Dynamics of Diaptomus gracilis

Author:
Kibby, Harold V.
Source:
Ecological monographs 1971 v.41 no.4 pp. 311-327
ISSN:
0012-9615
Subject:
respiratory rate,   etc   ; Diaptomus; aboveground biomass; adults; autumn; bacteria; body weight; metabolism; mortality; oxygen consumption; phytoplankton; population dynamics; reproduction; seasonal variation; spring; summer; temperature; winter;     Show all 18 Subjects
Abstract:
... The population dynamics and energetics of two populations of Diaptomus gracilis have been studied in two Thames Valley reservoirs. The seasonal changes in the standing crop biomass varied from a low of 0.3 Cal/m² to a high of 7 Cal/m². Although the population overwintered primarily as adults, reproduction was continuous throughout the year. From the mortality rate the production has been estimated ...
DOI:
10.2307/1948496

11. Continuous Measurement of Carbon Dioxide Evolution From Partitioned Forest Floor Components

Author:
Edwards, Nelson T.; Sollins, Phillip
Source:
Ecology 1973 v.54 no.2 pp. 406-412
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; carbon dioxide production; ecosystems; forest litter; forests; metabolism; polymethylmethacrylate; potassium hydroxide; roots;     Show all 9 Subjects
Abstract:
... Loss rates of organic detritus in ecosystems can be determined by measuring rates of CO_2 release from decomposing organic substrates. We used an open system employing inverted boxes and an infrared gas analyzer (IRGA) to obtain continuous measurements of CO_2 evolution from the floor or a mixed mesophytic forest. Plexiglass sheets were used to partition respiratory activity of two litter horizons ...
DOI:
10.2307/1934349

12. Net Photosynthesis of Cladonia Mitis (Sand.) From Sun and Shade Sites on the Wisconsin Pine Barrens

Author:
Lechowicz, Martin J.; Adams, Michael S.
Source:
Ecology 1973 v.54 no.2 pp. 413-419
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Cladonia; air; dormancy; drying; ecophysiology; lichens; photosynthesis; pine barrens; sand; thallus; water content; Wisconsin;     Show all 13 Subjects
Abstract:
... The lichen Cladonia mitis (Sand.) from the Wisconsin Pine Barrens showed no significant differences in the light—dependence of net photosynthesis of sun— and shade—grown mats. Maximal net photosynthesis was 1.13 mg CO_2. g⁽—1) (air dry weight). hr⁽—1) at 3.88 x 10⁵ ergs. cm⁽—2). sec⁽—1), 22.5 plus or minus 1.0 degrees,and near optimal thallus water content; the light compensation point was 0.36 x ...
DOI:
10.2307/1934350

13. The Kinetics of the Redox Reactions of Ubiquinone Related to the Electron-Transport Activity in the Respiratory Chain

Author:
KrÖGER, Achim; Klingenberg, Martin
Source:
European journal of biochemistry 1973 v.34 no.2 pp. 358-368
ISSN:
0014-2956
Subject:
respiratory rate,   etc   ; NAD (coenzyme); absorption; electron transfer; electron transport chain; equations; mixing; oxidation; oxygen; quantitative analysis; rotenone; succinic acid; titration; ubiquinones;     Show all 14 Subjects
Abstract:
... The role of ubiquinone (Q) in the respiratory chain is quantitatively analyzed by correlating both the steady-state redox level of Q and the kinetics of oxidation and reduction with the flux of the overall electron transport in uncoupled submitochondrial particles. This is achieved by experimentally defining donor and acceptor activities for Q. 1 The degree of reduction of Q in the steady state is ...
DOI:
10.1111/j.1432-1033.1973.tb02767.x

14. Some effects of overcrowding on the respiration of larval aedes aegypti

Author:
BARBOSA, P.; PETERS, T.M.
Source:
Entomologia experimentalis et applicata 1973 pp. 146-156
ISSN:
0013-8703
Subject:
respiratory rate,   etc   ; Aedes aegypti; larvae;     Show all 3 Subjects
Abstract:
... Changes in the respiratory rates of “standard”, overcrowded, and starved fourth-instar Aedes aegypti are compared. The respiratory effects of varying larval densities during and prior to measurement are investigated. In addition, the results of exposure of standard and overcrowded larvae to growth-retarding factors (GRF) at various concentrations are also evaluated. ...
DOI:
10.1111/j.1570-7458.1973.tb00260.x

15. Caloric, Elemental, and Nutritive Changes in Decomposing Juncus Roemerianus Leaves

Author:
de la Cruz, Armando A.; Gabriel, Benjamin C.
Source:
Ecology 1974 v.55 no.4 pp. 882-886
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Juncus roemerianus; carbon; containers; crude fiber; energy content; leaves; lipids; nitrogen; oxygen; phosphorus; plant tissues; protoplasm;     Show all 13 Subjects
Abstract:
... In situ decomposition rate of Juncus roemerianus (Juncaceae) leaves determined by litterbag method was 40% per year. Caloric, elemental, and proximate nutritive analyses of leaves at various stages of life and decay–classified as young, mature, standing dead, partially decayed, decomposed fragments, and particulate detritus–showed the following: (a) an increase in caloric content (4630—4911 g cal/ ...
DOI:
10.2307/1934425

16. A Model Explaining Successional Change in Standing Crop of Thermal Blue‐Green Algae

Author:
Fraleigh, Peter C.; Wiegert, Richard G.
Source:
Ecology 1975 v.56 no.3 pp. 656-664
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Cyanobacteria; algae; biomass; carbon dioxide; chlorophyll; ecological succession; ecosystems; equations; light intensity; nonlinear models; photoperiod; prediction;     Show all 13 Subjects
Abstract:
... The gross productivity and changes in the standing crop of both biomass and chlorophyll @a were measured during ecological succession in thermal blue—green algal community. The rate of gross production (Pg ₎ in gC°m— ²°h‐ ¹ was directly related to the chlorophyll α (Chl) in mg°m— ² and independent of light intensity (Pg = 0.018 chl⁰ , ⁵ ¹). In turn we found a log—log relationship of chlorophyll α ...
DOI:
10.2307/1935499

17. Energetics of Vertical Migration in Chaoborus Trivittatus Larvae

Author:
Swift, Michael C.
Source:
Ecology 1976 v.57 no.5 pp. 900-914
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Chaoborus; Copepoda; at-risk population; biomass; carbon; computer simulation; diet; energy; immigration; individual feeding; lakes; larvae; larval development; migratory behavior; periodicity; temperature; zooplankton; British Columbia;     Show all 19 Subjects
Abstract:
... One of the recent theories for the adaptive value of vertical migration states that migrants gain an energetic advantage over nonmigrants because by alternating between areas of high and low temperatures they are able to partition energy into growth more efficiently than nonmigrants. The energetics of the vertical migration of fourth—instar Chaoborus trivittatus larva in Eunice Lake, British Colum ...
DOI:
10.2307/1941056

18. Carbon Cycling in a Mixed Deciduous Forest Floor

Author:
Edwards, N. T.; Harris, W. F.
Source:
Ecology 1977 v.58 no.2 pp. 431-437
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; air flow; carbon; carbon cycle; deciduous forests; forest litter; metabolism; root exudates; roots;     Show all 9 Subjects
Abstract:
... A study of carbon cycling within the floor of a mixed deciduous forest included estimates of litterfall, litter standing crop, root turnover, lateral root standing crop, and measurements of gaseous carbon losses from the various components. Annual carbon inputs to the system were 161 g C ° m— ² as litterfall and 733 g C ° m— ² as small roots (<0.5 cm diam). Mean annual standing pools were: 01 litt ...
DOI:
10.2307/1935618

19. A Simulation Model for Decomposition in Grasslands

Author:
Hunt, H. William
Source:
Ecology 1977 v.58 no.3 pp. 469-484
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; adenosine triphosphate; animals; carbon dioxide production; feces; grasslands; humic substances; microbial biomass; mortality; nitrogen content; prediction; secondary productivity; simulation models; soil water;     Show all 14 Subjects
Abstract:
... A model has been developed to simulate the dynamics of decomposers and substrates in grasslands. Substrates represented are humic material, feces, and dead plant and animal remains. Except for humic material, substrates are further divided into a rapidly and a slowly decomposing fraction. The proportion of rapidly decomposing material in a substrate is predicted from its initial nitrogen content. ...
DOI:
10.2307/1938998

20. Fitness and Optimal Body Size in Zooplankton Population

Author:
Lynch, Michael
Source:
Ecology 1977 v.58 no.4 pp. 763-774
ISSN:
0012-9658
Subject:
respiratory rate,   etc   ; Daphnia pulex; body size; demography; food availability; natural selection; predation; reproduction; temperature; zooplankton;     Show all 10 Subjects
Abstract:
... A measure of fitness which is an explicit function of feeding efficiency and vulnerability to predation is introduced. Feeding efficiency is a function of feeding and respiration rates and the nature of the food supply. Defining fitness as a function of body size reveals several potential explanations for the evolution of life—histories and for mechanisms of competition in zooplankton populations. ...
DOI:
10.2307/1936212