The allometry of density within the space used by populations of mammalian Carnivora

2001 ◽  
Vol 79 (9) ◽  
pp. 1634-1640 ◽  
Author(s):  
K Shawn Smallwood
Keyword(s):  
Population Density ◽  
Body Mass ◽  
Mass Density ◽  
Density Estimates ◽  
Carnivore Species ◽  
Female Brain ◽  
Develop Theory ◽  
Allometric Analysis ◽  
Species Specific ◽  
The Relationship

The relationship between body mass and population density has been used to develop theory of how energy is used in ecosystems. The usual allometric density slope, –0.75, was reduced to near zero among species of mammalian Carnivora after Smallwood and Schonewald and Blackburn and Gaston adjusted density estimates by the sizes of the corresponding study areas. In this paper, I restricted the allometric analysis to density estimates made at or near the threshold area, which is the species-specific minimum area likely to support a population. I excluded densities estimated from subpopulations and "megapopulations", thereby removing biases of study design that had previously confused the allometry of population density. Density at threshold area declined with increasing body mass. The population's mass density did not relate to threshold area, within which carnivore species averaged 9 kg/km2. The spatial intensity of oxygen consumption did not relate to body mass, but assuming that species with smaller threshold areas occur at more locations than species with larger threshold areas, one must conclude that smaller bodied species use more energy from the environment than do larger bodied species. Furthermore, threshold area and density at threshold area were most responsive to female brain mass, which provides an ecological allometry that links spatial scale, sensory perception, parental care, life-history attributes, basal metabolic rate, and body mass.

scholarly journals Using Astragalus to Model Body Mass, Habitat Preference, and Population Density of Prehistoric Bovid Duboisia santeng (Dubois, 1891) in Eastern Java island in The Early Pleistocene

2020 ◽  
Author(s):  
Andri Wibowo
Keyword(s):  
Population Density ◽  
Body Mass ◽  
Habitat Preference ◽  
Regression Models ◽  
The Body ◽  
Early Pleistocene ◽  
Large Herbivores ◽  
Length Width ◽  
Fossil Records ◽  
The Relationship

Astragalus bone is one of the most important fossil records as it can reconstruct the prehistoric life. Respectively, this study aims to model the body mass, habitat preference, and population density of prehistoric bovid Duboisia santeng (Dubois 1891) in eastern Java island in the early Pleistocene. The astragali from 9 specimens were used to estimate the body mass and population density. Likewise regression models are used to analyze the relationship between astragalus lateral length, width, and body mass compared to the astragalus of extant Bovid species. The result revealed the body mass average was 60.3 kg (95%CI: 58.9-61.7) and this indicates the D. santeng belongs to large herbivores. While the population density was estimated at about 5.39 individuals per km2 (95% CI: 3.18-7.6).

scholarly journals Densities of the Eurasian Threetoed Woodpecker Picoides tridactylus calculated from sap row surveys are on par with estimates from fixed route bird censusing

Ornis Svecica ◽  
2021 ◽  
Vol 31 ◽  
pp. 94-106
Author(s):  
Björn Ferry ◽  
Johan Ekenstedt ◽  
Martin Green
Keyword(s):  
Population Density ◽  
Home Range ◽  
Large Scale ◽  
Montane Forest ◽  
Northern Sweden ◽  
Montane Forests ◽  
Density Estimates ◽  
Species Specific ◽  
Different Parts

Species-specific tracks animals can be an effective way of mapping species that are hard to find even if they are present. We used observations of sap rows on trees to calculate densities of Eurasian Three-toed Woodpeckers Picoides tridactylus. We surveyed 14 fixed routes in northern Sweden below the montane forest for sap rows during the autumn of 2020. We used our observations of fresh sap rows together with average home range and proportion of active territories per year derived from the literature, to calculate large-scale woodpecker population density. The density based on sap rows was 0.19 pairs per km2. Densities from fixed route bird observations for different parts of Västerbotten County below the montane forests were 0.13–0.14 pairs per km2, in relative agreement with the estimates from sap rows. We also calculated the population density from fixed route observations in the montane forests, and these were almost three times higher. Our density calculations correspond to 7,900 pairs in Västerbotten County. These results indicate that systematic counts of sap rows can quickly provide credible population density estimates of Eurasian Three-toed Woodpeckers.

Relationships between body mass, population density, and the self-thinning rule in stream-living salmonids

1997 ◽  
Vol 54 (5) ◽  
pp. 1025-1030 ◽  
Author(s):  
J B Dunham ◽  
G L Vinyard
Keyword(s):  
Body Size ◽  
Population Density ◽  
Body Mass ◽  
Experimental Studies ◽  
Fish Population ◽  
Population Characteristics ◽  
Causal Mechanisms ◽  
Temporal And Spatial Variability ◽  
Temporal And Spatial ◽  
Species Specific

In food and (or) space-limited populations, increases in average body size may be accompanied by increases in per capita space and (or) energy requirements. Thus, as body size increases in time or space, the equilibrium number of individuals that can be supported in a given environment should decrease. This relationship, referred to as self-thinning, produces a negative linear relationship between log body size (mass) and log population density. We studied body mass - population density relationships in stream-living populations of several trout species from the intermountain western United States. Our analyses of relationships between body mass and population density demonstrated that self-thinning can be manifested through both temporal and spatial variability in fish population characteristics. Several populations did not show self-thinning, possibly due to species-specific traits, temporal and spatial environmental variation, or both. Thinning lines may not reveal specific causal mechanisms, but they appear to be real, density-dependent responses and thus offer a potentially useful method for studying fish populations. Experimental studies of self-thinning under more controlled conditions are needed, however, to identify causal mechanisms and eliminate alternative explanations for body size - abundance relationships.

Absolute abundance and preservation rate of Tyrannosaurus rex

Science ◽  
2021 ◽  
Vol 372 (6539) ◽  
pp. 284-287
Author(s):  
Charles R. Marshall ◽  
Daniel V. Latorre ◽  
Connor J. Wilson ◽  
Tanner M. Frank ◽  
Katherine M. Magoulick ◽  
...  
Keyword(s):  
Population Density ◽  
Body Mass ◽  
Recovery Rate ◽  
Absolute Abundance ◽  
Extinct Species ◽  
Living Species ◽  
Input Variables ◽  
The Relationship ◽  
Preservation Rate

Although much can be deduced from fossils alone, estimating abundance and preservation rates of extinct species requires data from living species. Here, we use the relationship between population density and body mass among living species combined with our substantial knowledge of Tyrannosaurus rex to calculate population variables and preservation rates for postjuvenile T. rex. We estimate that its abundance at any one time was ~20,000 individuals, that it persisted for ~127,000 generations, and that the total number of T. rex that ever lived was ~2.5 billion individuals, with a fossil recovery rate of 1 per ~80 million individuals or 1 per 16,000 individuals where its fossils are most abundant. The uncertainties in these values span more than two orders of magnitude, largely because of the variance in the density–body mass relationship rather than variance in the paleobiological input variables.

scholarly journals Asupan kalsium, vitamin D, kafein, merokok, indeks massa tubuh dan hubungannya dengan kejadian osteoporosis pada pria di Kecamatan Duren Sawit, Jakarta Timur

2009 ◽  
Vol 6 (2) ◽  
pp. 53
Author(s):  
Eka Susanti ◽  
I Dewa Putu Pramantara ◽  
Retno Pangastuti
Keyword(s):  
Body Mass Index ◽  
Vitamin D ◽  
Bone Mass ◽  
Body Mass ◽  
Significant Relationship ◽  
Mass Density ◽  
Bone Mass Density ◽  
Caffeine Consumption ◽  
Vitamin D Intake ◽  
The Relationship

Background: Osteoporosis can cause public health problem because both man and woman have high risk factor for osteoporosis. This is related to high morbidity and mortality of man. The increase of elderly population intensifies the frequency of the prevalence of osteoporosis, which limits activities of the patients.Objective: To identify the relationship between calcium, vitamin D, and caffeine intake, smoking, and mass body index with osteoporosis among elderly men.Method: This study was analytical observational which used cross sectional design. Subject of the study were men of 55– 65 years old purposively chosen. The study was carried out at Sub district of Duren Sawit, Jakarta Timur.Result: There was no significant relationship between calcium intake and bone mass density (p > 0.05). There was no significant relationship between vitamin D intake and bone mass density (p > 0.05), smoking and bone mass density (p > 0.05), and caffeine consumption and bone mass density (p > 0.05). There was a significant relationship between body mass index and osteoporosis (p < 0.05).Conclusion: The relationship between calcium and vitamin D intake, smoking, caffeine consumption, and osteoporosis was insignificant. The relationship between body mass index and osteoporosis was significant.

Relationship between Leptin Concentration in Cord Blood and Foetal Growth and Maternal Anthropometry of GDM Mothers at Delivery

1970 ◽  
Vol 25 (1) ◽  
pp. 9-13
Author(s):  
S Jahan ◽  
TR Das ◽  
KB Biswas
Keyword(s):  
Body Mass Index ◽  
Birth Weight ◽  
Cord Blood ◽  
Body Mass ◽  
Anthropometric Measurements ◽  
Anthropometric Parameters ◽  
Serum Leptin ◽  
C Peptide ◽  
Cord Serum ◽  
The Relationship

Background and Aims: Cord blood leptin may reflect the leptinemic status of a newborn at birth more accurately than the leptin values of blood collected from other sites. The present study was undertaken to determine the relationship of cord serum leptin concentration at birth with neonatal and maternal anthropometric parameters. Materials and Methods: Blood was taken from the umbilical cord of the babies at delivery. Maternal anthropometric measurements were recorded at admission for delivery. Neonatal anthropometric measurements were recorded within 48 hours after delivery. Linear regression analysis was used to explore the relationship between cord serum leptin concentration and anthropometric parameters of the baby and the mother. Both Serum leptin and serum C-peptide levels were measured by chemiluminescence-based ELISA method. Results: The leptin concentration (ng/ml, mean±SD) in cord blood was 39.13±14.44. Cord leptin levels correlated with birth weight (r=0.673, p<0.0001), ponderal index (r=0.732, p<0.0001) but it did not correlate with maternal body mass index, gestational age (r=0.135, p=0.349) at delivery or cord serum C-peptide concentration (r=-0.049, p=0.735) or placental weight (r=0.203, p=0.157). Conclusion: There are associations between cord leptin concentration at delivery and birth weight, ponderal index (PI) of the babies but not body mass index (BMI) of the mothers. High leptin levels of the baby could represent an important feedback modulator of substrate supply and subsequently for adipose tissue status during late gestation. (J Bangladesh Coll Phys Surg 2007; 25 : 9-13)

scholarly journals Combination of sleep duration, TV time and body mass index is associated with cardiometabolic risk moderated by age in youth

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ana P. Sehn ◽  
Anelise R. Gaya ◽  
Caroline Brand ◽  
Arieli F. Dias ◽  
Roya Kelishadi ◽  
...  
Keyword(s):  
Body Mass Index ◽  
Risk Factor ◽  
Sleep Duration ◽  
Body Mass ◽  
Cardiometabolic Risk ◽  
High Systolic Blood Pressure ◽  
Television Time ◽  
The Relationship ◽  
Moderating Role

AbstractObjectivesThe combination of sleep duration, television (TV) time and body mass index (BMI) may be related to the alteration of cardiometabolic risk. However, there are few studies that use these variables grouped, and showing the moderating role of age. This study aimed to verify if the combination of sleep duration, TV time and BMI is associated with cardiometabolic risk and the moderating role of age in this relationship in youth.MethodsCross-sectional study conducted with 1411 adolescents (611 male), aged 10–17 years. Sleep duration, TV time and BMI were assessed and grouped into eight categories. Cardiometabolic risk was assessed by a continuous metabolic risk score, including the following variables: low HDL-cholesterol, elevated triglycerides, dysglycemia, high systolic blood pressure, high waist circumference and low cardiorespiratory fitness. Generalized linear models were used to test moderation of age in the relationship between the eight categories of sleep duration/television time/BMI with cardiometabolic risk.ResultsCardiometabolic risk factor showed association with all overweight or obesity independent of sleep time and TV time. Age moderated the relationship between sleep duration/television time/BMI with cardiometabolic risk. This association was stronger in younger adolescents (11 and 13 years), indicating that individuals with inadequate sleep, prolonged TV time and overweight/obesity present higher cardiometabolic risk values when compared to 15-year-old adolescents.ConclusionOverweight/obesity, independently of sleep duration and TV time, is the main risk factor for cardiometabolic disorders in adolescence. When moderated by age, younger adolescents that presented the combination of risk factors had higher cardiometabolic risk.

Carnivore Size and Quaternary Climatic Change in Southern Africa

1986 ◽  
Vol 26 (1) ◽  
pp. 153-170 ◽  
Author(s):  
Richard G. Klein
Keyword(s):  
South Africa ◽  
Southern Africa ◽  
Late Quaternary ◽  
Geochemical Data ◽  
Mathematical Relationship ◽  
Carnivore Species ◽  
Quantitative Estimates ◽  
The Relationship ◽  
Problematic Aspect ◽  
Cool Conditions

The relationship between carnassial length and latitude south is analyzed for 17 African carnivore species to determine if individuals tend to be larger in cooler climates, as predicted by Bergmann's Rule. With modern data in support, middle and late Quaternary temperatures might then be inferred from mean carnassial length in fossil samples, such as those from Equus Cave, Elandsfontein, Sea Harvest. Duinefontein, and Swartklip in the Cape Province of South Africa. One problematic aspect of the study is the use of carnassial length and latitude as necessary but imperfect substitutes for body size and temperature, respectively. For some species, another difficulty is the relatively small number of available modern specimens, combined with their uneven latitudinal spread. Still, in 14 of the species, carnassial length does tend to increase with latitude south, while mean carnassial length in the same species tends to be greater in those fossil samples which accumulated under relatively cool conditions, as inferred from sedimentologic, palynological, or geochemical data. Given larger modern samples from a wide variety of latitudes, refinement of the mathematical relationship between carnassial length and latitude in various species may even permit quantitative estimates of past temperatures in southern Africa.

Sign in / Sign up

Export Citation Format

Share Document