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107 results for “size at age”
Age and Size of Smith Firs at Treeline in Tibet 1700-2013
The most widespread response to global warming among alpine treeline ecotones is not an upward shift, but an increase in tree density. However, the impact of increasing density on interactions among trees at treeline is not well understood. Here, we test if treeline densification induced by climatic warming leads to increasing intraspecific competition. We mapped and measured the size and age of Smith fir trees growing in two treelines located in the southeastern Tibetan Plateau. We used spatial point-pattern and codispersion analyses to describe the spatial association and covariation among seedlings, juveniles, and adults grouped in 30-year age classes from the 1860s to the present. Effects of competition on tree height and regeneration were inferred from bivariate mark-correlations. Since the 1950s, a rapid densification occurred at both sites in response to climatic warming. Competition between adults and juveniles or seedlings at small scales intensified as density increased. Encroachment negatively affected height growth and further reduced recruitment around mature trees. We infer that tree recruitment at the study treelines was more cold-limited prior to 1950 and shifted to a less temperature-constrained regime in response to climatic warming. Therefore, the ongoing densification and encroachment of alpine treelines could alter the way climate drives their transitions towards subalpine forests.
Size, age, telomere and ecophysiology data of Gallotia galloti lizard species sampled in Tenerife
<p>The dataset is used in the manuscript "Nina Serén, Rodrigo Megía-Palma, Tatjana Simčič, Miha Krofel, Fabio Maria Guarino, Catarina Pinho, Anamarija Žagar, Miguel A. Carretero. Functional responses in a lizard along a 3.5 km altitudinal gradient. Journal of Biogeography (under review)."</p> <p>The dataset consists of measurements of individual lizards of the species Gallotia galloti, each tagged with a unique CODE. Data include year of sampling, population name, exact elevation (in meters above sea level) and approximate elevation (rounded to the nearest hundred, in meters), and sex. Measurements were as follows: Snout Vent Length (in millimeters), Mass (in grams), AGE_Consensus (in years), Relative Telomere Length, PMA(29ºC, 33 ºC and 37ºC) (Potential metabolic activity measured at experimental conditions of 29˚C, 33ºC and 37ºC, respectively,in µLO2/mg prot/h), Catalase (in relative units U/mg protein), EWLa (accumulated evaporative water loss (in grams) and Temperature_8AM-5PM (measurements of cloacal temperature at hourly intervals starting at 8AM and ending at 5PM).</p>
Age, size, and disease severity of thinleaf alder stems along the Tanana River floodplains, collected in 2006 and 2007.
Thinleaf alder stands on the Tanana River floodplains, sampled in 2006 and 2007: A subsample of thinleaf alder stems were aged using tree-ring analysis, and the age structures of alder populations were estimated from their size structures (DN_alder_stand_structure1), based on the size/age relationships derived from this dataset. Relationships between disease incidence/severity and size/age were also explored. Included in this dataset are: the stem diameter at breast height (dbh), age of stem at ground level, age at breast height, and disease severity.
Fig. 3 in Size-At-Age Variability And Sexual Dimorphism Of Morphometric Characteristics In The Late Ontogenesis Of The Marsh Frog, Pelophylax Ridibundus (Anura, Ranidae), From Terrytory Of Crimea
Fig. 3. The differentiation of males (А) and females (B) of the marsh frog according to the absolute values of the body measurements.
Fig. 2 in Size-At-Age Variability And Sexual Dimorphism Of Morphometric Characteristics In The Late Ontogenesis Of The Marsh Frog, Pelophylax Ridibundus (Anura, Ranidae), From Terrytory Of Crimea
Fig. 2. Micrographs of cross- sections through the middle part of the diaphysis of the fifth phalange of the fourth toe of frogs: a, b, c, d, e — the arrow indicates the lines that correspond wintering 1–5.
Data from: Effects of age, breeding strategy, population density, and number of neighbors on territory size and shape in Savannah Sparrows
<p>The size and shape of an animal's breeding territory are dynamic features influenced by multiple intrinsic and extrinsic factors and can have important implications for survival and reproduction. Quantitative studies of variation in these territory features can generate deeper insights into animal ecology and behavior. We explored the effect of age, breeding strategy, population density, and number of neighbors on the size and shape of breeding territories in an island population of Savannah Sparrows (<em>Passerculus sandwichensis</em>). Our dataset consisted of 407 breeding territories belonging to 225 males sampled over 11 years. We compared territory sizes to the age of the male territorial holder, the male's reproductive strategy (monogamy vs. polygyny), the number of birds in the study population (population density), and the number of immediate territorial neighbors (local density). We found substantial variation in territory size, with territories ranging over two orders of magnitude from 57 to 5727 m2 (0.0057 to 0.57 ha). Older males had larger territories, polygynous males had larger territories, territories were smaller in years with higher population density, and larger territories were associated with more immediate territorial neighbors. We also found substantial variation in territory shape, from near-circular to irregularly-shaped territories. Males with more neighbors had irregularly shaped territories, but the shape did not vary with male age, breeding strategy, or population density. For males that lived two years or longer, we found strong consistent individual differences in territory size across years, but weaker individual differences in territory shape, suggesting that size has high repeatability whereas shape has low repeatability. Our work provides evidence that songbird territories are highly dynamic and that their size and shape reflect both intrinsic factors (age and number of breeding partners) and extrinsic factors (population density and number of territorial neighbors).</p>
Fig. 5 in The Body Size, Age Structure And Growth Pattern Of The Endemic Balkan Mosor Rock Lizard (Dinarolacerta Mosorensis Kolombatović, 1886)
Fig. 5. The growth curves of male and female Mosor rock lizards. Age was assessed by skeletochronology, while the growth curves were fitted to VON BERTALANFFY's equation
Fig. 2. A in The Body Size, Age Structure And Growth Pattern Of The Endemic Balkan Mosor Rock Lizard (Dinarolacerta Mosorensis Kolombatović, 1886)
Fig. 2. A cross-section of the femur diaphysis of an adult female Mosor rock lizard. Eight LAGs are shown (LAGs appear as thin dark lines); the first LAG is partly eroded, while the outer LAGs are closely spaced (decreasing intervals between them indicate a shift in a resource allocation after sex-
Fig. 1 in The Body Size, Age Structure And Growth Pattern Of The Endemic Balkan Mosor Rock Lizard (Dinarolacerta Mosorensis Kolombatović, 1886)
Fig. 1. The sample size and body length (SVL) distribution of Mosor rock lizard hatchlings, subadults and adults
Fig. 3 in The Body Size, Age Structure And Growth Pattern Of The Endemic Balkan Mosor Rock Lizard (Dinarolacerta Mosorensis Kolombatović, 1886)
Fig. 3. The distributions of the first and second visible LAGs. The first deposited LAG has been resorbed in sections in which the diameter of the first visible LAG is greater than 0.60 µm
Рис. 2. Линейный (А) и весовой (Б) рост бурого морского петушка Alectrias alectrolophus из разных районов Тауйской губы Охотского моря Fig. 2. Linear (A) and weight (Б) growth of stone cockscomb Alectrias alectrolophus from different regions of Taui Bay, the Sea of Okhotsk in Size-age structure, growth, and feeding of stone cockscomb Alectrias alectrolophus (Stichaeidae) from different areas of Taui Bay, the Sea of Okhotsk
Рис. 2. Линейный (А) и весовой (Б) рост бурого морского петушка Alectrias alectrolophus из разных районов Тауйской губы Охотского моря Fig. 2. Linear (A) and weight (Б) growth of stone cockscomb Alectrias alectrolophus from different regions of Taui Bay, the Sea of Okhotsk
Рис. 3. Возрастная Δинамика относитеΛьных приростов ΔΛины (А) и массы теΛа (А) бурого морского петушка Alectrias alectrolophus из разных районов Тауйской губы Охотского моря Fig. 3. Age-related dynamics of relative gains in length (A) and body weight (A) of stone cockscomb Alectrias alectrolophus from different regions of Taui Bay, the Sea of Okhotsk in Size-age structure, growth, and feeding of stone cockscomb Alectrias alectrolophus (Stichaeidae) from different areas of Taui Bay, the Sea of Okhotsk
Рис. 3. Возрастная Δинамика относитеΛьных приростов ΔΛины (А) и массы теΛа (А) бурого морского петушка Alectrias alectrolophus из разных районов Тауйской губы Охотского моря Fig. 3. Age-related dynamics of relative gains in length (A) and body weight (A) of stone cockscomb Alectrias alectrolophus from different regions of Taui Bay, the Sea of Okhotsk
Рис. 1. Возрастной (А), размерный (Б) и весовой (В) состав бурого морского петушка Alectrias alectrolophus из разных районов Тауйской губы Охотского моря in Size-age structure, growth, and feeding of stone cockscomb Alectrias alectrolophus (Stichaeidae) from different areas of Taui Bay, the Sea of Okhotsk
Рис. 1. Возрастной (А), размерный (Б) и весовой (В) состав бурого морского петушка Alectrias alectrolophus из разных районов Тауйской губы Охотского моря
Figure 1 in The body size, age structure, and growth of Bosc's fringe-toed lizard, Acanthodactylus boskianus (Daudin, 1802)
Figure 1. Cross-sections (18 µm thick) at the diaphysis level of a phalange of juvenile (A) and male (B) Acanthodactylus boskianus. A) Four-year-old juvenile, 45.14 mm body length. Four LAGs were observed in the periosteal bone. B) Eight-yearold male, 79.86 mm body length. Eight LAGs were observed in the periosteal bone (arrow heads). Endosteal resorption and endosteal bone were present. Periphery (black arrow) was not regarded as a LAG (m.c. = marrow cavity, r.l. = reversal line, e.r. = endosteal resorption, e.b. = endosteal bone).
Figure 2 in Age structure and body size of the Strauch's racerunner, Eremias strauchi strauchi Kessler, 1878
Figure 2. Age frequency distributions for males and females of an Eremias strauchi strauchi sample population.
Figure 1 in The first record of age structure and body size of the Suphan Racerunner, Eremias suphani Başoğlu & Hellmich, 1968
Figure 1. Cross-section (18 µm thick) at the diaphysis level of a phalanx of male E. suphani, 60.52 mm SVL, 7 years old. Six LAGs were observed in the periosteal bone. The first LAG was destroyed by endosteal resorption and endosteal bone was present. Periphery was not regarded as a LAG. Arrows indicate endosteal resorption and periphery, and arrowheads indicate LAGs. e.b. = endosteal bone, m.c. = marrow cavity, r.l. = reversal line, p = periphery.
Figure 2 in Body size and age in three populations of the northern banded newt Ommatotriton ophryticus (Berthold, 1846) from Turkey
Figure 2. Cross-sections through phalanges of O. ophryticus. A) An 8-year-old female from Bahçesultan. Each LAG corresponds to a year. B) An 8-year-old female from Tosya. The first LAG was destroyed by endosteal resorption. Periphery was not regarded as a LAG. Arrowheads show the LAGs and red arrow shows the false LAG (e.b. = endosteal bone, e.r. = endosteal resorption, k.l. = Kastschenko line, m.c. = marrow cavity, p. = periphery).
Data from: Effects of age, breeding strategy, population density, and number of neighbors on territory size and shape in Savannah Sparrows
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Snag size and composition across a compositional gradient of intermediate-aged and mature forest stands within Interior Alaska collected 2008-2011.
This dataset includes snag biomass data for intermediate-aged and mature boreal forest stands across interior Alaska.
Size and composition of all live and dead trees and large shrubs across a compositional gradient of intermediate-aged and mature forest stands within Interior Alaska collected 2008-2011.
This dataset includes snag biomass data for intermediate-aged (20-59 yr old) and mature (60+ yr old) boreal forest stands across interior Alaska. Data from intermediate-aged stands was published in Alexander et al. 2012.
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