scholarly journals Informational energy flow as an aspect of the ecological efficiency of marine ciliates. [Euplotes vannus, Uronema marinum]

1975 ◽  
Author(s):  
H.A. Rubin ◽  
J.J. Lee
Keyword(s):  
Energy Flow ◽  
Ecological Efficiency ◽  
Marine Ciliates ◽  
Euplotes Vannus ◽  
Informational Energy

Informational energy flow as an aspect of the ecological efficiency of marine ciliates

1976 ◽  
Vol 62 (1) ◽  
pp. 69-91 ◽  
Author(s):  
Howard A. Rubin ◽  
John J. Lee
Keyword(s):  
Energy Flow ◽  
Ecological Efficiency ◽  
Marine Ciliates ◽  
Informational Energy

Energy Flow and Secondary Production of the Amphipods Hyalella azteca and Crangonyx richmondensis occidentalis in Marion Lake, British Columbia

1971 ◽  
Vol 28 (5) ◽  
pp. 711-726 ◽  
Author(s):  
Jack A. Mathias
Keyword(s):  
Population Growth ◽  
Energy Flow ◽  
Standing Crop ◽  
Production Efficiency ◽  
Hyalella Azteca ◽  
Growth Efficiency ◽  
Ecological Efficiency ◽  
Net Production ◽  
Annual Basis ◽  
Predator System

The Hyalella azteca population in Marion Lake, B.C., assimilated and produced about three times as much energy as did the Crangonyx richmondensis occidentalis population from May 1966 to May 1967, but during the summer the energy flow of H. azteca was four times, and production was five times, that of C. r. occidentalis.Hyalella azteca was abundant at a depth of 1.0 m (mean summer standing crop, 1952 animals/m2), but was rare (75 animals/m2) at depths greater than 2.5 m. Growth, molting, respiration, and hence energy flow rates decreased with depth, due (in part) to lower ambient temperatures in deeper water. On an annual basis, a mean standing crop of 1.1 kcal/m2 of H. azteca assimilated 18.1 kcal/m2, respired 13.5 kcal/m2, and used 4.6 kcal/m2 in production of growth, molts, and eggs. Approximately two-thirds of the annual energy flow was completed between June and October. On an annual basis, the ecological efficiency of an H. azteca-predator system was in the range 2.5–12.5%, the net production efficiency was 25%, and the net population growth efficiency was 16%.The mean summer density of C. r. occidentalis remained constant with depth (about 283 animals/m2). Annual energy flow and production were not appreciably affected by lower temperatures in deeper water. On an annual basis, a mean standing crop of 0.7 kcal/m2 assimilated 6.5 kcal/m2, respired 5.2 kcal/m2, and used 1.4 kcal/m2 in production. Crangonyx r. occidentalis energy flow was fairly constant throughout the year. The ecological efficiency of a C. r. occidentalis-predator system was in the range 2–10.5%, the net production efficiency was 21%, and the population growth efficiency was 17% on an annual basis.

Informational Energy Flow As an Aspect of Protozoan Nutrition*,†

1980 ◽  
Vol 27 (1) ◽  
pp. 5-9 ◽  
Author(s):  
JOHN J. LEE
Keyword(s):  
Energy Flow ◽  
Informational Energy

Analysis of Energy Flow and Production in an Unexploited Marine Flatfish Population

1973 ◽  
Vol 30 (11) ◽  
pp. 1717-1728 ◽  
Author(s):  
J. C. MacKinnon
Keyword(s):  
Energy Intake ◽  
Energy Flow ◽  
Analytical Approach ◽  
Total Population ◽  
Seasonal Pattern ◽  
Ecological Efficiency ◽  
Resident Population ◽  
Net Production ◽  
Production Processes ◽  
Hippoglossoides Platessoides

The seasonal pattern of production processes in an unexploited resident population of American plaice (Hippoglossoides platessoides) in St. Margaret’s Bay, N.S., was analyzed with an energetics model which represents an extension of the analytical approach used in fishery theory. During summer, production is about twice the annual net production of 1.5 kcal/m2 by fish aged 1 and up. The ecological efficiency is 17%, with larvae and 0+ fish accounting for some 20% of total population ingestion and 34% of net population production. Metabolic expenditures constitute the largest fraction (62%) of population energy intake and about 80% of this amount is consumed during summer. Plaice ingest about half the yearly estimated production (25 kcal/m2) of benthos in the deeper parts of the Bay.

Evolution of the secondary metabolite versus evolution of the species

2002 ◽  
Vol 74 (11) ◽  
pp. 2207-2221 ◽  
Author(s):  
F. Pietra
Keyword(s):  
Secondary Metabolite ◽  
Red Seaweeds ◽  
Euplotes Crassus ◽  
Marine Ciliates ◽  
Euplotes Vannus ◽  
Well Differentiated

Four stereochemical series of diastereomeric polyhalogenated chamigrane sesquiterpenes -headed by obtusol, isoobtusol, rogiolol, and cartilagineol- suggest the existence of four lineages of red seaweeds in the genus Laurencia.On another front, concerning marine ciliates, euplotane sesquiterpenes characterize worldwide the morphospecies Euplotes crassus, well differentiated from Euplotes raikov, Euplotes rariseta, and Euplotes vannus, which furnish different-skeleton sesquiterpenoids, and the latter also C30-backbone isoprenoids. The latter three morphospecies, however, show polymorphism in the variability of their isoprenoids.

Critical energy flow paths for SEA models

1999 ◽  
Author(s):  
Ed O'Keefe ◽  
Matt Berge
Keyword(s):  
Energy Flow ◽  
Critical Energy ◽  
Flow Paths

Ecological efficiency of international joint ventures// ECONOMICS, POLITICS, LAW: TRENDS AND PROSPECTS: сб.науч.тр./ OEAPS Inc.; редкол.: Флора Бертран (отв.ред.) [и др.]. - Берлин, Германия : OEAPS Inc., December 2018. - С. 5-7.

2019 ◽  
Author(s):  
Anna Igorevna Dudnik
Keyword(s):  
Joint Ventures ◽  
International Joint Ventures ◽  
Energy Industry ◽  
Ecological Efficiency ◽  
International Joint

The article describes the concept of ecological efficiency in terms of international joint ventures. It discoveries the main features, specific terms and notions, it also gives the examples from energy industry. The article suggests the measures which company can take for increasing ecological efficiency of its projects.

Energetic Asymmetry Connected with Energy Flow Changes in Response to Eutrophication: A Study of Multiple Fish Species in Subtropical Shallow Lakes

2020 ◽  
Vol 67 (4) ◽  
pp. 305
Author(s):  
Hong Fu ◽  
Huan Zhang ◽  
Liang He ◽  
Yongcui Sha ◽  
Kangshun Zhao ◽  
...  
Keyword(s):  
Fish Species ◽  
Shallow Lakes ◽  
Energy Flow ◽  
Flow Changes
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