scholarly journals The qualitative behavior of a plankton-fish interaction model with food limited growth rate and non-constant fish harvesting

2021 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
R. P. Gupta ◽  
Shristi Tiwari ◽  
Shivam Saxena
Keyword(s):  
Growth Rate ◽  
Interaction Model ◽  
Qualitative Behavior ◽  
Limited Growth

Ingestion-Limited Growth of Aquatic Animals: The Case for Blackman Kinetics

1982 ◽  
Vol 39 (12) ◽  
pp. 1585-1595 ◽  
Author(s):  
Richard E. Condrey
Keyword(s):  
Growth Rate ◽  
Linear Relationship ◽  
Ingestion Rate ◽  
Growth Efficiency ◽  
Published Data ◽  
Limited Growth ◽  
Aquatic Animals

The published data on ingestion-limited growth in aquatic animals is shown to be consistent with Blackman kinetics. As such, if ingestion limits growth rate there is a linear relationship between growth and ingestion from starvation to satiation. If, however, growth is limited by some factor other than ingestion rate, there is no increase in growth rate with increasing ingestion rate.Key words: ingestion, growth, growth efficiency, Blackman kinetics

scholarly journals Mutation accumulation and the formation of range limits

2015 ◽  
Vol 11 (1) ◽  
pp. 20140871 ◽  
Author(s):  
Roslyn C. Henry ◽  
Kamil A. Bartoń ◽  
Justin M. J. Travis
Keyword(s):  
Growth Rate ◽  
Deleterious Effect ◽  
Environmental Gradient ◽  
Species Distributions ◽  
Mutation Accumulation ◽  
Range Limits ◽  
Deleterious Mutations ◽  
Mutation Load ◽  
Limited Growth ◽  
Marginal Populations

The dynamics of range formation are important for understanding and predicting species distributions. Here, we focus on a process that has thus far been overlooked in the context of range formation; the accumulation of mutation load. We find that mutation accumulation severely reduces the extent of a range across an environmental gradient, especially when dispersal is limited, growth rate is low and mutations are of intermediate deleterious effect. Our results illustrate the important role deleterious mutations can play in range formation. We highlight this as a necessary focus for further work, noting particularly the potentially conflicting effects dispersal may have in reducing mutation load and simultaneously increasing migration load in marginal populations.

Effects of vitamin B12 concentration on chemostat cultured Synechococcus sp. strain PCC 7002

1995 ◽  
Vol 41 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Steven W. Wilhelm ◽  
Charles G. Trick
Keyword(s):  
Growth Rate ◽  
Vitamin B12 ◽  
Continuous Culture ◽  
Gel Electrophoresis ◽  
Outer Membrane Proteins ◽  
Polyacrylamide Gel Electrophoresis ◽  
Entire Group ◽  
Vitamin B ◽  
Limited Growth ◽  
Synechococcus Sp

The effects of vitamin B12 availability on the physiology of the cyanobacterium Synechococcus sp. strain PCC 7002 were examined in a continuous culture chemostat system. The availability of vitamin B12 within the system was demonstrated to control the cell density and cellular chlorophyll levels under nutrient-limiting conditions. Electron micrographs of vitamin B12 replete and vitamin B12 deficient cyanobacteria indicated that a reduction in vitamin B12 availability induced a loss of thylakoid integrity within the system. Polyacrylamide gel electrophoresis demonstrated that the expression of outer membrane proteins of 95, 70, and 34 kDa was enhanced during vitamin B12 limited growth. Cellular quotients were determined to be a minimum of 256 molecules of vitamin B12/cell to sustain a growth rate of 0.6/day. A comparison with eukaryotic plankton demonstrated that the vitamin B12 requirements of cyanobacteria may be more similar to those of chloroplasts than to those of the entire group of eukaryotic algae.Key words: chemostats, cellular quotients, cyanobacterial physiology, Synechococcus, vitamin B12.

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