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114 results for “Body Length”
Data from: Individual body mass and length dataset for over 12,000 fish from Iberian streams
<p>Body size data of stream fish in the north-east of the Iberian Peninsula.</p> <p>We provide a unique fish individual body size dataset collected from our own sampling and public sources in north-eastern Spain. The dataset includes individual body size measures (fork length and mass) of 12,288 individuals of 24 fish species within 10 families collected at 118 locations in large rivers and small streams. Fish were caught by one-pass electrofishing following European standard protocols. The fish dataset has information on the local instream conditions including climatic variables (i.e., temperature and precipitation), topography (i.e., altitude), nutrient concentration (i.e., total phosphorus and nitrates), and the IMPRESS values (a measure of cumulative human impacts in lotic ecosystems). The potential uses of this new fish dataset are manifold, including developing size-based indices to further estimate the ecological status of freshwater ecosystems, allometric models, and analysis of variation in body size structure along environmental gradients.</p>
A method to evaluate body length of live aquatic vertebrates using digital images
<p>Traditional methods to measure body lengths of aquatic vertebrates rely on anesthetics, and extended handling times. These procedures can increase stress, potentially affecting the animal's welfare after its release. We developed a simple procedure using digital images to estimate body lengths of coastal cutthroat trout (<i>Oncorhynchus clarkii clarkii</i>) and larval coastal giant salamander (<i>Dicamptodon tenebrosus</i>). Images were post-processed using ImageJ2. We measured more than 1,800 individuals of these two species from 200 pool habitats along 9.6 river kilometers. The percent error (mean ± SE) of our approach compared to the use of a traditional graded measuring board was relatively small for all metrics of the two species. Total length of trout was -2.2% ± 1.0. Snout-vent length and total length of larval salamanders was 3.5% ± 3.3 and -0.6% ± 1.7, respectively. We cross-validated our results by two independent observers that followed our protocol to measure the same animals and found no significant differences (<i>p</i> > 0.7) in body size distributions for all metrics of the two species. Our procedure provides reliable information of body size reducing stress and handling time in the field. The method is transferable across taxa and the inclusion of multiple animals per image increases sampling efficiency with stored images that can be reviewed multiple times. This practical tool can improve data collection of animal size over large sampling efforts and broad spatiotemporal contexts.</p>
Telomere length and rate of change, as they relate to body size and longevity
<p><span>Telomeres, the terminal repetitive DNA sequences at the ends of linear chromosomes, have strong associations with longevity in some major taxa. Longevity has been linked to rate of decline in telomere length in birds and mammals, and absolute telomere length seems to be associated with body mass in mammals. Using a phylogenetic comparative method and 30 species of birds, we examined longevity (reflected by maximum lifespan), absolute telomere length, the rate of change in telomere length (TROC), and body mass (often strongly associated with longevity) to ascertain their degree of association. We divided lifespan into two life-history components, one reflected by body size (measured as body mass), and a component that was statistically independent of body mass. While both lifespan and body mass were strongly associated with a family tree of the species (viz., the phylogeny of the species), telomere measures were not. Telomere length was not significantly associated with longevity or body mass, or our measure of mass-independent lifespan. TROC, however, was strongly associated with mass-independent lifespan, but only to a much lesser degree at best with body mass-predicted lifespan. Our results supported an association of TROC and longevity, in particular longevity that was independent of body size and part of the pace-of-life syndrome of life histories.</span></p>
Fig. 1 in Wing-Length, Body Mass And Fat Reserves Of Robins (Erithacus Rubecula) During Autumn Migration In Hungary
Fig. 1. Location of ringing sites
Figure 2 in Comparative analysis of brain in relation to the body length and weight of common carp (Cyprinus carpio) in captive (hatchery) and wild (river system) populations
Figure 2. brain of common carps in wild environment.
Figure 1 in Comparative analysis of brain in relation to the body length and weight of common carp (Cyprinus carpio) in captive (hatchery) and wild (river system) populations
Figure 1. brain of common carps in captive environment.
Figure 2 in Comparative brain analysis of wild and hatchery reared Mahseer (Tor putitora) relative to their body weight and length
Figure 2. Relationship between body and brain weight of wild and hatchery reared fish.
body length (CMO) + body length (VT): body-length-CMO-VT.txt.gz
Details in [DATA-1664](https://eol-jira.bibalex.org/browse/DATA-1664)
American Insects: American Insects- body length
The American Insects site is an on-line guide to 2800 different insects from the Americas, containing photographs taken by Stephen Cresswell as well as information gleaned from articles, books, emails and on-line postings.
Trait Spreadsheet to DwCA: Coleoptera Body Length Data II
<p></p>https://eol-jira.bibalex.org/browse/DATA-1882<p></p>Created: 2023-02-01 15:37
Trait Spreadsheet to DwCA: Coleoptera Body Length Data
<p></p>https://eol-jira.bibalex.org/browse/DATA-1882<p></p>Updated: 2023-02-01 15:02
Trait Spreadsheet to DwCA: Body Length Data for North American Syrphidae & Tabanidae
<p></p>https://eol-jira.bibalex.org/browse/DATA-1882<p></p>Updated: 2022-12-30 10:55
FIGURE 5 Ancestral state reconstructions. A. Whorl count. B. Body length. C in Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae)
FIGURE 5 Ancestral state reconstructions. A. Whorl count. B. Body length. C. Altitude.
A method to evaluate body length of live aquatic vertebrates using digital images
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Predicting body length and assessing the shape of tail-propelled Mesozoic marine reptiles
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Telomere length and rate of change, as they relate to body size and longevity
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Variation in the ontogenetic allometry of horn length in bovids along a body mass continuum
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Data from: Genetic and maternal effects on tail spine and body length in the invasive spiny water flea (Bythotrephes longimanus)
Interest in the evolution of invasive species has grown in recent years, yet few studies have investigated sources of variation in invasive species traits experiencing natural selection. The spiny water flea, Bythotrephes longimanus, is an invasive zooplankton in the Great Lakes that exhibits seasonal changes in tail spine and body length consistent with natural selection. Evolution of Bythotrephes traits, however, depends on the presence and magnitude of quantitative genetic variation, which could change within or across years. Clonal analysis of wild-captured Bythotrephes indicated that variance components for distal spine length were variable among but not within years. Spine length was always heritable but was not always influenced by maternal effects. In contrast, variance components for body length varied both within and among years, but likewise body length was always heritable and not always influenced by maternal effects. Results indicate that important Bythotrephes traits have heritable variation comparable to native species and other invasive species that would enable an evolutionary response to natural selection. This evolutionary capacity could contribute to the widespread success and dramatic effects of Bythotrephes invasion in systems with diverse biotic and abiotic conditions.
Data from: Length, body depth, and gape relationships and inference on piscivory among North American centrarchids
Species of Centrarchidae are major components of inland fisheries in much of North America. Thus, information gained from the assessment of interspecies interactions and/or quantifying predator-prey relationships is a useful tool for fisheries managers. Using preserved fish specimens (n = 717) from 20 species of centrarchids, we made measurements of total length (TL), standard length (SL), horizontal gape, and body depth for each individual. We fitted mathematical models that included horizontal gape and body depth as functions of TL and SL, and TL as a function of SL. Linear-regression-model fits were generally good (r2 = 0.764-0.998) for all 20 species, with 61 of 78 possible models having r2 values exceeding 0.90. Horizontal gape–SL (F3,702 = 77.18, P < 0.001) and body depth-SL (F3,702 = 91.79, P < 0.001) ratios differed significantly along a gradient that reflected the species' likelihood of piscivory. Slopes of TL–SL regressions did not vary by species, which enabled development of a generalized TL–SL model for centrarchids. Supplemental analyses supported that morphometric measurements had not been influenced significantly by preservation. Results of this study are useful to fisheries managers involved with understanding species interactions within centrarchid-dominated food webs, which are of high priority in most fisheries-management plans.
Data for: Warming temperatures limit the maximum body length of teleost fishes across a latitudinal gradient in Norwegian waters
<p>As the majority of marine organisms are water-breathing ectotherms, temperature and dissolved oxygen are key environmental variables that influence their fitness and geographic distribution. In line with the gill-oxygen limitation theory (GOLT), the maximum asymptotic body size of water-breathing ectotherms is limited by an insufficient amount of oxygen that is supplied to meet metabolic demand once a threshold of gill surface area to body weight ratio is surpassed. Here we employed generalised additive models (GAMs) to investigate the relative influence of temperature, regional variation in dissolved oxygen, and geographic location (that encompasses multiple latent variables) on the maximum body length of ten teleost fish species, as well to predict their maximum body length, across a large temperature, depth and latitudinal gradient throughout Norwegian waters. As dissolved oxygen levels were near saturation across the study area, we conclude that the predicted maximum lengths of our study species were not limited by oxygen availability. Conversely, the majority of study species display a clear relationship in that their predicted maximum length is either decreasing, asymptotic or parabolic across their observed temperature range. We also observed smaller maximum body lengths for multiple species within the coldest extent of their temperature range, which may be explained by increases in basal metabolism via cold denaturation. Overall, our results suggest that the maximum lengths of our study species are influenced by temperature, thus supporting the tenants of the GOLT.</p>
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