SOME PHYSICAL FACTORS INFLUENCING THE FEEDING BEHAVIOR OF DAPHNIA MAGNA STRAUS

1965 ◽  
Vol 43 (4) ◽  
pp. 603-611 ◽  
Author(s):  
J. W. McMahon
Keyword(s):  
Feeding Behavior ◽  
Daphnia Magna ◽  
Feeding Rate ◽  
Total Darkness ◽  
Physical Factors ◽  
Filtering Rate ◽  
Pure Cultures ◽  
Effect Of Food ◽  
Filtering Rates ◽  
Animal Size

The feeding behavior of Daphnia magna was studied in relation to the effect of animal size, water temperature, and light intensity. D. magna were fed on pure cultures of Chlorella vulgaris and Saccharomyces cerevisiae labelled with radioactive phosphorus.As size of D. magna increased over the range 1.25 mm to 3.54 mm, both maximum filtering rate and maximum feeding rate increased. The relation between the increase of filtering rate and the increase of maximum feeding rate is such that the "incipient limiting level" (the external level above which there is no limiting effect of food supply) also increases as size of Daphnia increases. The feeding rate of D. magna was studied over the temperature range 5 °C to 35 °C. The temperature optimum for feeding was approximately 24 °C.Feeding rate was also studied under conditions of total darkness and at light intensities of 100, 300, 500, 1,000, 3,000, and 10,000 ft-c. Illumination from total darkness to 1000 ft-c did not appear to affect the feeding rate of D. magna.The results of this investigation are discussed in relation to previous studies of filtering rates of other Crustacea.

Environmental factors influencing the feeding behavior of Daphnia magna Straus

1968 ◽  
Vol 46 (4) ◽  
pp. 759-762 ◽  
Author(s):  
J. W. McMahon
Keyword(s):  
Feeding Behavior ◽  
Daphnia Magna ◽  
Tap Water ◽  
Common Source ◽  
Physiological Changes ◽  
Factors Influencing ◽  
Filtering Rate ◽  
Electronic Measurement ◽  
History Of ◽  
Thoracic Appendage

Feeding behavior of Daphnia magna on the food organism Saccharomyces cerevisiae, determined by electronic measurement of frequency of thoracic appendage movements (FTA), differs between groups cultured in lake, river, and dechlorinated tap water. FTA also varied between similar Daphnia cultured at different times in water collected from a common source. It is suggested that variability in water quality or physiological changes, possibly influenced by thermal history of the animal, alters feeding behavior. The concept of a "normal filtering rate" (McMahon and Rigler 1965) is reevaluated.

PSVI-20 Extent of genetic variation in feeding behavior and genetic associations with performance and feed efficiency in crossbred growing cattle

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 233-234
Author(s):  
David N Kelly ◽  
Roy D Sleator ◽  
Craig P Murphy ◽  
Stephen B Conroy ◽  
Donagh P Berry
Keyword(s):  
Genetic Variation ◽  
Feeding Behavior ◽  
Energy Intake ◽  
Feed Efficiency ◽  
Fixed Effects ◽  
Feeding Rate ◽  
Feeding Time ◽  
Genetic Associations ◽  
Event Duration ◽  
Growing Cattle

Abstract To the best of our knowledge, the genetic variability in feeding behavior, as well as relationships with performance and feed efficiency, has not been investigated in a cattle population of greater than 1,500 animals. Our objective was to quantify the genetic parameters of several feeding behavior traits, and their genetic associations with both performance and feed efficiency traits, in crossbred growing cattle. Feed intake and live-weight data were available on 6,088 bulls, steers and heifers; of these, 4,672 cattle had backfat and muscle ultrasound data, and 1,548 steers and heifers had feeding behavior data. Genetic (co)variance parameters were estimated using animal linear mixed models; fixed effects included test group, heterosis, recombination loss, dam parity, age in months at the end of test, and the two-way interaction between age in months at the end of test and sex. Heritability was estimated to be 0.51 (0.097), 0.61 (0.100), 0.44 (0.093), 0.48 (0.094), and 0.47 (0.095) for feed events per day, feeding time per day, feeding rate, feed event duration, and energy intake per feed event, respectively. Coefficients of genetic variation ranged from 0.11 (feeding time per day) to 0.22 (feed event duration). Genetically heavier cattle with a higher energy intake per day, and faster growth rate, had a faster feeding rate and a greater energy intake per feed event. Genetic correlations between feeding behavior and feed efficiency were generally not different from zero, however, there was a genetic correlation of 0.36 (0.11) between feeding time per day and residual energy intake. Significant heritable and exploitable genetic variation exists in several feeding behavior traits in crossbred growing cattle which are also correlated with several performance traits. As some feeding behavior traits may be relatively less resource intensive to measure, they could be useful as predictor traits in beef cattle genetic evaluations.

Effect of Food Quality, Larval Density, and Photoperiod on the Feeding Rate of the California Oakworm (Lepidoptera: Dioptidae)

1983 ◽  
Vol 12 (3) ◽  
pp. 792-798 ◽  
Author(s):  
W. Jan ◽  
A. Volney ◽  
James E. Milstead ◽  
Vernard R. Lewis
Keyword(s):  
Food Quality ◽  
Feeding Rate ◽  
Larval Density ◽  
Effect Of Food

Effect of food type and concentration on the survival, longevity, and reproduction of Daphnia magna

Hydrobiologia ◽  
1994 ◽  
Vol 287 (2) ◽  
pp. 207-214 ◽  
Author(s):  
Fernando Martínez-Jerónimo ◽  
Rafael Villaseñor ◽  
Guillermo Rios ◽  
Félix Espinosa
Keyword(s):  
Daphnia Magna ◽  
Food Type ◽  
Effect Of Food

scholarly journals Psychoactive drugs citalopram and mirtazapine caused oxidative stress and damage of feeding behavior in Daphnia magna

2022 ◽  
Vol 230 ◽  
pp. 113147
Author(s):  
Shengzi Duan ◽  
Yourong Fu ◽  
Shanshan Dong ◽  
Yunfeng Ma ◽  
Hangyu Meng ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Feeding Behavior ◽  
Daphnia Magna ◽  
Psychoactive Drugs

scholarly journals The Influence of Food Density, Flock Size, and Disturbance on the Functional Response of Bewick’s Swans (Cygnus columbianus bewickii) in Wintering Habitats

Animals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 946 ◽  
Author(s):  
Chao Yu ◽  
Lizhi Zhou ◽  
Nazia Mahtab ◽  
Shaojun Fan ◽  
Yunwei Song
Keyword(s):  
Feeding Behavior ◽  
Functional Response ◽  
Habitat Management ◽  
Feeding Rate ◽  
Handling Time ◽  
Foraging Strategies ◽  
Food Density ◽  
Flock Size ◽  
Functional Responses ◽  
Cygnus Columbianus

Perceiving how animals adjust their feeding rate under a variety of environmental conditions and understanding the tradeoffs in their foraging strategies are necessary for conservation. The Holling functional response, which describes the relationship of feeding rate and food density to searching rate and handling time, has been applied to a range of waterbirds, especially with regard to Type II functional responses that describe an increasing feeding rate with food density but at a decelerating rate as the curve approaches the asymptote. However, feeding behavior components (feeding rate, searching rate, and handling time) are influenced by factors besides prey density, such as vigilance and flock size. In this study, we aim to elucidate how Bewick’s swans (Cygnus columbianus bewickii) adopt flexible foraging strategies and vary their feeding behavior components in response to disturbance, flock size, and food density. We collected focal sampling data on the foraging behavior of swans that foraged rice grains, foxnut seeds, and tubers in paddy field, foxnut pond, and lake habitats, respectively, in Shengjin and Huangpi lakes during winter from 2016 to 2018. The observed feeding rate was not correlated with food density and displayed a positive relationship with searching rate but negative relationships with handling time, flock size, overall vigilance time, and disturbance time. Handling time was negatively correlated with food density and flock size, yet it increased with disturbance, overall vigilance time, and normal vigilance time. Searching rate was negatively correlated with food density, flock size, and disturbance time. Feeding rate was affected by the combined effects of handling time and searching rate, as well as food density and searching rate. The shape of the observed functional response could not be fitted to Holling’s disc equation. However, the disc equation of the predicted feeding rate of wintering swans was found to be driven by food density. This provides insight into how wintering waterbirds adopt appropriate foraging strategies in response to complicated environmental factors, which has implications for wildlife conservation and habitat management.

Effect of food preparation on feeding behavior of lion-tailed macaques

Zoo Biology ◽  
1989 ◽  
Vol 8 (1) ◽  
pp. 57-65 ◽  
Author(s):  
Amy Smith ◽  
D. G. Lindburg ◽  
S. Vehrencamp
Keyword(s):  
Feeding Behavior ◽  
Food Preparation ◽  
Effect Of Food

scholarly journals Miniaturising acute toxicity and feeding rate measurements in Daphnia magna

2017 ◽  
Vol 139 ◽  
pp. 352-357 ◽  
Author(s):  
Konstantinos Grintzalis ◽  
Wenkui Dai ◽  
Konstantinos Panagiotidis ◽  
Alexia Belavgeni ◽  
Mark R. Viant
Keyword(s):  
Acute Toxicity ◽  
Daphnia Magna ◽  
Feeding Rate
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