scholarly journals Erratum to: Barpressing in the presence of free food as a function of food deprivation

1972 ◽  
Vol 27 (1) ◽  
pp. 11-11
Author(s):  
Robert D. Tarte ◽  
Ron L. Snyder
Keyword(s):  
Food Deprivation ◽  
Free Food

scholarly journals Barpressing in the presence of free food as a function of food deprivation

1972 ◽  
Vol 26 (3) ◽  
pp. 169-170 ◽  
Author(s):  
Robert D. Tarte ◽  
Ron L. Snyder
Keyword(s):  
Food Deprivation ◽  
Free Food

Effects of Food Deprivation on Fixed Ratio Barpressing in the Presence of Free Food

1977 ◽  
Vol 27 (2) ◽  
pp. 441-448 ◽  
Author(s):  
Lizabeth A. Barclay ◽  
Donald E. Jackson
Keyword(s):  
Food Deprivation ◽  
Fixed Ratio ◽  
Free Food

scholarly journals Prevalence and Photobiology of Photosynthetic Dinoflagellate Endosymbionts in the Nudibranch Berghia stephanieae

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2200
Author(s):  
Ruben X. G. Silva ◽  
Paulo Cartaxana ◽  
Ricardo Calado
Keyword(s):  
Food Deprivation ◽  
Photosynthetic Efficiency ◽  
Rapid Decrease ◽  
Complete Loss ◽  
Symbiotic Association ◽  
Non Invasive ◽  
Sea Slugs ◽  
Non Destructive ◽  
Over Time

Berghia stephanieae is a stenophagous sea slug that preys upon glass anemones, such as Exaiptasia diaphana. Glass anemones host photosynthetic dinoflagellate endosymbionts that sea slugs ingest when consuming E. diaphana. However, the prevalence of these photosynthetic dinoflagellate endosymbionts in sea slugs appears to be short-lived, particularly if B.stephanieae is deprived of prey that host these microalgae (e.g., during bleaching events impacting glass anemones). In the present study, we investigated this scenario, along with food deprivation, and validated the use of a non-invasive and non-destructive approach employing chlorophyll fluorescence as a proxy to monitor the persistence of the association between sea slugs and endosymbiotic photosynthetic dinoflagellates acquired through the consumption of glass anemones. Berghia stephanieae deprived of a trophic source hosting photosynthetic dinoflagellate endosymbionts (e.g., through food deprivation or by feeding on bleached E. diaphana) showed a rapid decrease in minimum fluorescence (Fo) and photosynthetic efficiency (Fv/Fm) when compared to sea slugs fed with symbiotic anemones. A complete loss of endosymbionts was observed within 8 days, confirming that no true symbiotic association was established. The present work opens a new window of opportunity to rapidly monitor in vivo and over time the prevalence of associations between sea slugs and photosynthetic dinoflagellate endosymbionts, particularly during bleaching events that prevent sea slugs from incorporating new microalgae through trophic interactions.

Economic impact of initial period of lockdown in Kolkata and suburbs

2021 ◽  
pp. 1-9
Author(s):  
Bandana Sen ◽  
Aloke Kar
Keyword(s):  
Distribution System ◽  
Small Businesses ◽  
Initial Period ◽  
Decisive Role ◽  
Income Group ◽  
Free Food ◽  
The Public ◽  
Public Distribution System ◽  
Food Grains ◽  
On Line

The present study provides a snapshot of the level of degradation of economic and living conditions of middle-class households of Kolkata and its neighbourhood during ‘lockdown’. It is based on an on-line survey of households of students of five purposively-selected colleges carried out during the second half of May 2020. The survey reveals that inflow of regular normal income had ceased altogether for over 40% of the sample households. About 15% of the households suffered from outright job loss or complete denial or withholding of wages and salaries payments of their members in paid employment and another about 27% reported complete closure of small businesses run by them. The normal-times income had altogether ceased for over a half of the households of the lowest income group. Predictably, the worst hit group was the wage labourers. Over four-fifths households with their prime earning member in wage employment reported job and earnings related problems, with over a fourth reporting job losses. Households with self-employed prime earners too were severely affected, with about three-fourths of them reporting such problems. Even the households with regular-salaried prime earners were badly hit. About a half of them reported job and earnings related problems. The results suggest that food grains distribution through the Public Distribution System (PDS) played a decisive role in averting an imminent famine-like situation. About 60% of the sample households were found to have procured food stuff from the PDS. Among the wage-labourers’ households, well over 80% reported dependence on the PDS, with ostensibly a large proportion of them receiving food altogether free. Despite free food grains distribution, about 5% of the sample households could not arrange three meals a day for all its members.

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