scholarly journals Pup ultrasonic isolation calls of six gerbil species and the relationship between acoustic traits and body size

2021 ◽  
Vol 8 (3) ◽  
pp. 201558
Author(s):  
Julia D. Kozhevnikova ◽  
Ilya A. Volodin ◽  
Alexandra S. Zaytseva ◽  
Olga G. Ilchenko ◽  
Elena V. Volodina
Keyword(s):  
Body Size ◽  
Discriminant Analysis ◽  
Peak Frequency ◽  
Meriones Unguiculatus ◽  
Similar Relationship ◽  
Species Identity ◽  
Call Duration ◽  
Acoustic Adaptation ◽  
Ultrasonic Calls ◽  
The Relationship

Among Gerbillinae rodents, ultrasonic calls of adults of small-sized species are typically higher frequency than those of adults of large-sized species. This study investigates whether a similar relationship can be found in pups of six gerbil species ( Dipodillus campestris , Gerbillus perpallidus , Meriones unguiculatus , Meriones vinogradovi , Sekeetamys calurus and Pachyuromys duprasi ). We compared the average values of acoustic variables (duration, fundamental and peak frequency) of ultrasonic calls (20 calls per pup, 1200 in total) recorded from 6- to 10-day-old pups (10 pups per species, 60 in total) isolated for 2 min at 22°C and then weighed and measured for body variables. The longest calls (56 ± 33 ms) were found in the largest species, and the highest frequency calls (74.8 ± 5.59 kHz) were found in the smallest species. However, across species, call duration (ranging from 56 to 159 ms among species) did not display a significant relationship with pup body size; and, among frequency variables, only the minimum fundamental frequency depended on pup body size. Discriminant analysis assigned 100% of calls to the correct species. The effect of species identity on the acoustics was stronger than the effect of body size. We discuss these results with the hypotheses of acoustic adaptation, social complexity, hearing ranges and phylogeny.

scholarly journals Polyphony of domestic dog whines and vocal cues to body size

2020 ◽  
Author(s):  
Olga V Sibiryakova ◽  
Ilya A Volodin ◽  
Elena V Volodina
Keyword(s):  
Body Size ◽  
Fundamental Frequency ◽  
Body Mass ◽  
Domestic Dog ◽  
Acoustic Similarity ◽  
Sound Sources ◽  
Companion Dogs ◽  
Fundamental Frequencies ◽  
Ultrasonic Calls ◽  
The Relationship

Abstract In domestic dogs Canis familiaris, vocal traits have been investigated for barks and growls, and the relationship between individual body size and vocal traits investigated for growls, with less corresponding information for whines. In this study, we examined the frequency and temporal traits of whines of 20 adult companion dogs (9 males, 11 females), ranging in body mass from 3.5 to 70.0 kg and belonging to 16 breeds. Dog whines (26–71 per individual, 824 in total) were recorded in conditioned begging contexts modeled by dog owners. Whines had 3 independent fundamental frequencies: the low, the high and the ultra-high that occurred singly as monophonic calls or simultaneously as 2-voice biphonic or 3-voice polyphonic calls. From the smallest to largest dog, the upper frequency limit varied from 0.24 to 2.13 kHz for the low fundamental frequency, from 2.95 to 10.46 kHz for the high fundamental frequency and from 9.99 to 23.26 kHz for the ultra-high fundamental frequency. Within individuals, the low fundamental frequency was lower in monophonic than in biphonic whines, whereas the high fundamental frequency did not differ between those whine types. All frequency variables of the low, high, and ultra-high fundamental frequencies correlated negatively with dog body mass. For duration, no correlation with body mass was found. We discuss potential production mechanisms and sound sources for each fundamental frequency; point to the acoustic similarity between high-frequency dog whines and rodent ultrasonic calls and hypothesize that ultra-high fundamental frequencies function to allow private, “tete-a-tete” communication between members of social groups.

Leg Strength Is Related to Endurance Run Performance in Children and Adolescents with Mental Retardation

2000 ◽  
Vol 12 (3) ◽  
pp. 324-333 ◽  
Author(s):  
Bo Fernhall ◽  
Kenneth H. Pitetti
Keyword(s):  
Mental Retardation ◽  
Body Size ◽  
Children And Adolescents ◽  
Aerobic Capacity ◽  
Significant Influence ◽  
Moderate Mental Retardation ◽  
Leg Strength ◽  
And Gender ◽  
The Relationship ◽  
Shuttle Run

This study evaluated the relationship between leg strength and endurance run performance, independent of aerobic capacity (V̇O2peak), body size, and gender, in children and adolescents with mild or moderate mental retardation. Twenty-six individuals (15 boys and 11 girls) volunteered and underwent tests of V̇O2peak, isokinetic leg strength, and endurance run performance (600-yard ran/walk and 20-m shuttle run). Results showed that leg strength was significantly related to both types of run performance; however, when controlling for V̇O2peak, body size, and gender, leg strength was a more significant contributor to the 600-yard run/walk than to 20-m shuttle run performance. Gender did not influence these relationships. These data suggest that leg strength has a significant influence on endurance run performance in children and adolescents with mild or moderate mental retardation.

Comparison of Endoscopic Retrograde Pancreatography with Functional and Histologic Changes in Chronic Pancreatitis

1987 ◽  
Vol 28 (3) ◽  
pp. 289-293 ◽  
Author(s):  
H. A. Heij ◽  
H. Obertop ◽  
M. van Blankenstein ◽  
G. A. J. J. Nix ◽  
D. L. Westbroek
Keyword(s):  
Chronic Pancreatitis ◽  
Discriminant Analysis ◽  
Test Data ◽  
Pancreatic Surgery ◽  
Pancreatic Disease ◽  
Pancreatic Tissue ◽  
Endoscopic Retrograde Pancreatography ◽  
Endoscopic Retrograde ◽  
The Relationship ◽  
Histologic Changes

The findings from endoscopic retrograde pancreatography (ERP) and secretin-CCK test data were compared in 69 patients: 36 with chronic pancreatitis, 9 with possible chronic pancreatitis, and 24 without chronic pancreatic disease. The ERP findings were also compared with the histologic changes in pancreatic tissue in 18 patients who underwent pancreatic surgery for chronic pancreatitis. ERP films were reviewed according to the criteria proposed by Kasugai et coll. (8) with special attention paid to the side branches. Secretin-CCK test data were interpreted using the discriminant analysis. A good correlation between bicarbonate and chymotrypsin output and ductular changes at ERP was found. The results of ERP and the secretin-CCK test were compatible in 86 per cent of the patients. The relationship between ERP findings and histologic changes was not straightforward. It was concluded that ERP and the secretin-CCK test are complementary in the diagnosis of chronic pancreatitis. ERP does not necessarily represent the histology in chronic pancreatitis.

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.

An ecological explanation for hyperallometric scaling of reproduction

2021 ◽  
Author(s):  
Tomos Potter ◽  
Anja Felmy
Keyword(s):  
Body Size ◽  
Reproductive Output ◽  
Resource Competition ◽  
Natural Populations ◽  
Scaling Exponent ◽  
Wild Populations ◽  
Wet Season ◽  
Size Dependent ◽  
In The Wild ◽  
The Relationship

AbstractIn wild populations, large individuals have disproportionately higher reproductive output than smaller individuals. We suggest an ecological explanation for this observation: asymmetry within populations in rates of resource assimilation, where greater assimilation causes both increased reproduction and body size. We assessed how the relationship between size and reproduction differs between wild and lab-reared Trinidadian guppies. We show that (i) reproduction increased disproportionately with body size in the wild but not in the lab, where effects of resource competition were eliminated; (ii) in the wild, the scaling exponent was greatest during the wet season, when resource competition is strongest; and (iii) detection of hyperallometric scaling of reproduction is inevitable if individual differences in assimilation are ignored. We propose that variation among individuals in assimilation – caused by size-dependent resource competition, niche expansion, and chance – can explain patterns of hyperallometric scaling of reproduction in natural populations.

The Divergent Mental Health Effects of Dashed Expectations and Unfulfilled Aspirations: Evidence from American Lawyers’ Careers

2021 ◽  
pp. 019027252110450
Author(s):  
Ioana Sendroiu ◽  
Laura Upenieks ◽  
Markus Schafer
Keyword(s):  
Mental Health ◽  
Longitudinal Data ◽  
Health Outcomes ◽  
Career Advancement ◽  
Similar Relationship ◽  
Conceptual Distinction ◽  
Future Orientations ◽  
Considerable Work ◽  
Mental Health Effects ◽  
The Relationship

Considerable work has shown that optimistic future orientations can be a resource for resilience across individuals’ lives. At the same time, research has shown little downside to “shooting for the stars” and failing. Here, we bring these competing insights to the study of lawyers’ careers, investigating the relationship between mental health and failure in achieving desired career advancement. To do this, we differentiate between expectations and aspirations for the future, a conceptual distinction that has been much theorized but little tested. Using longitudinal data, we show that dashed expectations of making partner are associated with depreciated mental health outcomes, whereas a similar relationship does not exist for unfulfilled aspirations. We conclude that inasmuch as expectations are more deeply rooted in an individual’s realistic sense of their future self, failing to achieve what is expected is more psychologically damaging than failing to achieve what is simply aspired. Our findings contrast with studies of younger people that demonstrate fewer consequences for unfulfilled future orientations, and so we highlight the importance of specifying how particular future-oriented beliefs fit into distinct career and life course trajectories, for better or for worse. In the process, we contribute to the academic literatures on future orientations, work, and mental health.

scholarly journals Gender, Age, Race and Lactose Intolerance: Is There Evidence to Support a Differential Symptom Response? A Scoping Review

Nutrients ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1956 ◽  
Author(s):  
Rebecca Lapides ◽  
Dennis Savaiano
Keyword(s):  
Body Size ◽  
Scoping Review ◽  
Lactose Intolerance ◽  
The Elderly ◽  
Genetic Differences ◽  
Exhaustive Search ◽  
Google Scholar ◽  
Racial Groups ◽  
Symptom Response ◽  
The Relationship

Research evaluating the relationship between lactose intolerance (LI) symptoms and age, gender and race is reviewed. An exhaustive search was conducted on the Google Scholar and PubMed databases. The evidence suggests that women, the elderly or specific racial groups are not more susceptible to LI, but rather dose, body size and genetic differences in lactase non-persistence (LNP) are the primary drivers of intolerance symptoms.

The Beginnings

2017 ◽  
Author(s):  
Raymond Pierotti ◽  
Brandy R. Fogg
Keyword(s):  
Body Size ◽  
Gene Pool ◽  
Southern Asia ◽  
Early Stages ◽  
The World ◽  
State Of Affairs ◽  
The Relationship

This introductory chapter provides an overview of the relationship between humans and wolves. The relationship began as coevolutionary, with the species cooperating at times but also capable of functioning independently. This state of affairs dominated early stages of the relationship between the two species and may have persisted for 20,000 years or longer. In other parts of the world, for example, southern Asia, humans began to shape wolves into clearly domestic forms: animals phenotypically distinct from wolves, especially in body size. This latter process involves various aspects of the wolf gene pool being essentially divided, with many individuals staying true wolves while others changed in form, becoming what people now describe as “dogs” without losing their genetic links to their wolf ancestry or their ability to interbreed with wolves.

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