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107 results for “size at age”
Testing size-frequency distributions as a method of ontogenetic aging: a life history assessment of hadrosaurid dinosaurs from the Dinosaur Park Formation of Alberta, Canada, with implications for hadrosaurid paleoecology
<p class="MsoNoSpacing">Hadrosaurid dinosaurs, the dominant large-bodied terrestrial herbivores in most Laurasian Late Cretaceous ecosystems, have an exceptional fossil record consisting of many species known from partial ontogenetic series making them an ideal clade with which to conduct life history studies. Previous research considered the Dinosaur Park Formation (DPF) of Alberta as an attritional, or time-averaged, sample and interpreted size-frequency distribution of long bones collected from the DPF with three size classes to suggest that hadrosaurids from the DPF attained near-asymptotic body size in under three years. This conflicted with previously published osteohistological estimates of 6+ years for penecontemporaneous hadrosaurids from the Two Medicine Formation (TMF) of Montana suggesting either extreme variation in hadrosaurid growth rates or that size-frequency distributions and/or osteohistology and growth modeling inaccurately estimate ontogenetic age.</p> <p>We tested the validity of the previously proposed size-age relationship of hadrosaurids from the DPF by significantly increasing sample size and combining data from size-frequency distributions and osteohistology across multiple long bones elements. The newly constructed size-frequency distributions typically reveal four relatively distinct size-frequency peaks that, when integrated with the osteohistological data, aligned with growth marks. The yearling size class was heavily underrepresented in the size-frequency distribution. If not due to preservation, this suggests that either juvenile (< 2 years of age) hadrosaurids from the DPF had increased survivorship following an initially high nestling mortality rate, or that yearlings were segregated from adults. A growth curve analysis revealed asymptotic body size was attained in approximately 7 years, which is consistent with hadrosaurids from the TMF. The data suggest size-frequency distributions of attritional samples underestimate age and overestimate growth rates, but when paired with osteohistology can provide unique life history insights.</p>
Figure 1. A in Age structure and body size of the Strauch's racerunner, Eremias strauchi strauchi Kessler, 1878
Figure 1. A cross-section (16 µm in thickness) at the diaphysis level of a phalanx of a female Eremias strauchi strauchi individual (m.c. = marrow cavity, r.l. = resorption line, k.l. = Kastschenko line, and e.b. = endosteal bone). The 5 LAGs are indicated by black arrows (double LAGs with double arrows).
Figure 1 in Body size and age in three populations of the northern banded newt Ommatotriton ophryticus (Berthold, 1846) from Turkey
Figure 1. Map showing the localities of studied samples of O. ophryticus (1. Bahçesultan village/Bilecik; 2. Tosya/Kastamonu; 3. Erbaa/Tokat).
Table ¹: Summary statistics for mandible measurements (in mm) of each age group of Choloepus (mean ± standard deviation [range] sample size). in Harpy eagle kill sample provides insights into the mandibular ontogenetic patterns of two-toed sloths (Xenarthra: Choloepus)
<p><b>Table ¹:</b> Summary statistics for mandible measurements (in mm) of each age group of <i>Choloepus</i> (mean ± standard deviation [range] sample size).</p><table><tbody><tr><th><b>Measurement</b></th><th><b>Age classes</b></th></tr></tbody><tbody><tr><th></th><td><b>Infant</b></td><td><b>Įuvenile</b></td><td><b>Subadult</b></td><td><b>Adult</b></td></tr><tr><th>BAC</th><td>44.08 ± 3.04 [40.7–47.92] 4</td><td>48.54 ± 2.65 [42.39–52.29] 15</td><td>54.46 ± 3.79 [50.78–59.2] 4</td><td>65.12 ± 3.28 [61.05–71.01] 9</td></tr><tr><th>BCC</th><td>20.57 ± 1.47 [18.76–22.35] 4</td><td>23.08 ± 1.33 [20.83–25.78] 16</td><td>26.51 ± 0.73 [25.53–27.25] 4</td><td>31.81 ± 1.59 [28.84–33.69] 9</td></tr><tr><th>HCA</th><td>12.84 ± 1.41 [9.66–15.12] 13</td><td>15.66 ± 1.74 [11.95–20.11] 18</td><td>17.48 ± 1.13 [16.32–18.88] 4</td><td>21 ± 1.25 [18.49–23.08] 9</td></tr><tr><th>HCC</th><td>8.16 ± 1.4 [6.01–10.29] 13</td><td>9.65 ± 1.23 [7.52–11.68] 15</td><td>13.08 ± 0.72 [12.11–13.83] 4</td><td>23.68 ± 0.98 [22.16–25.02] 9</td></tr><tr><th>LAM</th><td>17.74 ± 1.57 [14.58–20.44] 13</td><td>20.6 ± 1.15 [19.15–22.72] 18</td><td>24.11 ± 2.11 [21.29–26.3] 4</td><td>26.28 ± 1.67 [23.31–28.9] 9</td></tr><tr><th>LCD</th><td>8.69 ± 1.11 [7.48–11.43] 13</td><td>9.88 ± 0.75 [8.89–11.73] 18</td><td>11.43 ± 0.8 [10.7–12.54] 4</td><td>12 ± 1.07 [10.18–13.89] 9</td></tr><tr><th>LMS</th><td>14.78 ± 0.84 [13.52–16.22] 13</td><td>16.98 ± 0.54 [16–18.11] 18</td><td>18.74 ± 0.69 [17.72–19.15] 4</td><td>20.06 ± 0.71 [19.15–21.38] 9</td></tr><tr><th>TML</th><td>56.3 ± 3.76 [50.53–61.07] 13</td><td>64.9 ± 1.99 [62.81–68.57] 18</td><td>72.42 ± 2.12 [69.41–74.39] 4</td><td>86.67 ± 3.52 [81.7–91.93] 9</td></tr></tbody></table><p>See main text for measurement abbreviations.</p>
Figure 3 in Age, body size and growth pattern of Argenteohyla siemersi pederseni (Anura: Hylidae) in northeastern Argentina
Figure 3. Age distribution of Argenteohyla siemersi pederseni.
Circulating exosomes decrease in size and increase in number between birth and age 7: relations to fetal growth and liver fat
<p>Circulating exosomes</p>
Testing size-frequency distributions as a method of ontogenetic aging: a life history assessment of hadrosaurid dinosaurs from the Dinosaur Park Formation of Alberta, Canada, with implications for hadrosaurid paleoecology
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Data from: Age, condition and dominance-related sexual ornament size before and during the breeding season in the black grouse Lyrurus tetrix
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Data from: Size-related scaling of tree form and function in a mixed-age forest
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Data from: Plastic responses of some life history traits and cellular components of body size in Aphidius ervi as related to the age of its host Acyrthosiphon pisum
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Data from: A multigenerational effect of parental age on offspring size but not fitness in common duckweed (Lemna minor)
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Data from: How many cubs can a mum nurse? Maternal age and size influence litter size in polar bears
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TGF-beta Sma/Mab signaling regulates a set of genes in oocytes associated with reproductive aging and another set in L4 associated with body size growth
GEO Series GSE23509. Caenorhabditis elegans. 17 samples. Type: Expression profiling by array.
Antagonistic control of myofiber size and muscle protein quality control by the ubiquitin ligase UBR4 during aging
GEO Series GSE149637. Mus musculus. 16 samples. Type: Expression profiling by high throughput sequencing.
Cell size is a determinant of stem cell potential during aging (HSC size-fractionation RNA-seq dataset)
GEO Series GSE154333. Mus musculus. 8 samples. Type: Expression profiling by high throughput sequencing.
Figure 2 in The body size, age structure, and growth of Bosc's fringe-toed lizard, Acanthodactylus boskianus (Daudin, 1802)
Figure 2. Age distribution of male, female, and juvenile Acanthodactylus boskianus.
Evaluation of the Correlation Between Vein Size Inferior Cava and Right Atrial Pressure in Pediatric Age and Creation of a Possible Predictive Model
ClinicalTrials.gov study NCT06776133. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Longitudinal Zinc Intakes and Exchangeable Zinc Pool Sizes in Breastfed Small for Gestational Age vs Appropriate for Gestational Age Infants in Pakistan
ClinicalTrials.gov study NCT01140256. IPD Sharing: Not stated. Countries: 1. Publications: 0.
The Relationship Between Age and Carpal Tunnel Size
ClinicalTrials.gov study NCT03294733. IPD Sharing: NO. Countries: 1. Publications: 0.
Does Portion Size Influence Intake of Low-Energy-Dense Foods in Preschool-aged Children?
ClinicalTrials.gov study NCT00936507. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.