scholarly journals The Jaw Adductors of Strepsirrhines in Relation to Body Size, Diet, and Ingested Food Size

2011 ◽  
Vol 294 (4) ◽  
pp. 712-728 ◽  
Author(s):  
Jonathan M.G. Perry ◽  
Adam Hartstone-Rose ◽  
Christine E. Wall
Keyword(s):  
Body Size ◽  
Food Size ◽  
Jaw Adductors

scholarly journals Intraspecific Variation in Maximum Ingested Food Size and Body Mass in Varecia rubra and Propithecus coquereli

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Adam Hartstone-Rose ◽  
Jonathan M. G. Perry
Keyword(s):  
Body Size ◽  
Body Mass ◽  
Individual Variation ◽  
Size Variation ◽  
Maximum Size ◽  
Least Squares Regression ◽  
Scaling Relationship ◽  
Varecia Rubra ◽  
Food Size ◽  
The Relationship

In a recent study, we quantified the scaling of ingested food size (Vb )—the maximum size at which an animal consistently ingests food whole—and found that Vb scaled isometrically between species of captive strepsirrhines. The current study examines the relationship between Vb and body size within species with a focus on the frugivorous Varecia rubra and the folivorous Propithecus coquereli. We found no overlap in Vb between the species (all V. rubra ingested larger pieces of food relative to those eaten by P. coquereli), and least-squares regression of Vb and three different measures of body mass showed no scaling relationship within each species. We believe that this lack of relationship results from the relatively narrow intraspecific body size variation and seemingly patternless individual variation in Vb within species and take this study as further evidence that general scaling questions are best examined interspecifically rather than intraspecifically.

scholarly journals Body size and food size in freshwater zooplankton

1984 ◽  
Vol 81 (20) ◽  
pp. 6427-6431 ◽  
Author(s):  
K. G. Bogdan ◽  
J. J. Gilbert
Keyword(s):  
Body Size ◽  
Freshwater Zooplankton ◽  
Food Size

Long-term divergence in body size produced by food size in laboratory populations of Acheta domesticus (Orthoptera: Gryllidae)

1985 ◽  
Vol 63 (6) ◽  
pp. 1395-1401 ◽  
Author(s):  
Patricia Tennis
Keyword(s):  
Body Size ◽  
Genetic Selection ◽  
Acheta Domesticus ◽  
Hybrid Strain ◽  
Commercial Strain ◽  
Laboratory Populations ◽  
Alternative Hypotheses ◽  
Food Size ◽  
Rule Out

Experiments were performed to test the hypothesis that food size can act as a selection pressure on body size. For 19–22 generations, two strains of house crickets were reared on small-sized food, large-sized food, or a mixture. Within both strains, small food consistently and significantly produced smaller individuals than did large food or mixed food. In the hybrid strain, rearing of all food-size lines on the same food size revealed that differences observed among the food-size lines had a genetic component. Within the commercial strain, all food-size lines were reared on the same food size during generations 16 and 19 in order to test for genetic divergence among the lines. No differences in body size were observed among the lines for generation 16. However, during generation 19, when populations from each line were reared on all three food-size treatments, the small-food line contained the smallest crickets only when reared on mixed food or large food. Although one cannot rule out alternative hypotheses of maternal effects or genetic drift, the hypothesis of genetic selection on body size by food size cannot be rejected with these data.

Effect of environment on functional traits of co-occurring water beetles

2021 ◽  
Vol 57 ◽  
pp. 2
Author(s):  
Sayali D. Sheth ◽  
Anand D. Padhye ◽  
Hemant V. Ghate
Keyword(s):  
Body Size ◽  
Western Ghats ◽  
Positive Association ◽  
Species Traits ◽  
Size Ratio ◽  
Water Beetles ◽  
Rlq Analysis ◽  
Food Size ◽  
First Time ◽  
The Western Ghats

We investigated trait-environment relationships of co-occurring aquatic Coleoptera specifically true water beetles in anthropogenic ponds from the Western Ghats, India for the first time. Our objectives were to: (1) identify species assemblages; (2) study species traits; (3) study trait-environment relationships of co-occurring species. We analysed 132 samples collected using standardised quantitative method during the years 2016 and 2017. We found 16 significant assemblages using Fager's index, where most of the pairs have body size ratio of 1.3 or more. For example, Laccophilus parvulus and Hydaticus satoi pair has body size ratio of 3.98, and both are predators, indicating that body size is a function of food size. Moreover, factor analysis revealed three major swimming categories of studied beetles, namely fast swimmers, maneuverers and poor swimmers. Further, the RLQ analysis, and combined approach of RLQ and fourth-corner analysis showed that environmental variables affected species traits. For instance, odonate nymphs and submerged vegetation were positively associated with fast swimmers like Laccophilus inefficiens and Hydaticus satoi. The assemblage of congeners Hydroglyphus inconstans and H. flammulatus can be predator-mediated as these beetles showed negative association with odonate nymphs as well as competitive to obtain resource by showing positive association with chironomid larvae. Therefore, the traits studied were important for ecological performances of species in ponds. This study has also highlighted the importance of anthropogenic ponds in the Western Ghats as biodiversity refuges of ecologically unique and evolutionary old major extant lineages of water beetles.

Adolescent Gender Differences in Weight, Activity, and Body-Size Perception

2012 ◽  
Author(s):  
Judith R. Mccalla ◽  
Katie E. Chipungu ◽  
Patrice G. Saab ◽  
Amanda J. Countryman ◽  
Erin N. Etzel ◽  
...  
Keyword(s):  
Gender Differences ◽  
Body Size ◽  
Size Perception ◽  
Body Size Perception
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