Articles tagged with Body Size
A Lund University study finds that temperate regions have larger insects due to bird predation pressure and temperature, reversing a 200-million-year-old trend. This shift helps explain the global variation in body size among dragonflies and damselflies.
The cichlid fish species Lamprologous callipterus has a unique reproductive system where males are 12 times bigger than females, but also has a smaller male morph that is 60 times smaller. A new study found that the genetic mechanism underlying this size-determining sex chromosome is linked to the growth hormone regulator gene GHRHR.
A new study reveals that fishes in the deep ocean are likely to decrease in size with climate warming, which could have significant ecological effects. Researchers analyzed ancient fish otoliths to track changes in body size over glacial and interglacial periods.
A study by McGill University researchers found that Northern Tree Shrews' body size increased with warmer climates, contradicting Bergmann's rule. The team analyzed museum specimens and historical climate data, revealing a reversal of the Island rule as well, highlighting the complex interaction between ecological factors.
A new study of twins found that consistent exercise can change the molecules in the human body that influence gene behavior, leading to lower signs of metabolic disease. The study suggests that markers of metabolic disease are strongly influenced by how a person interacts with their environment, rather than just their inherited genetics.
A randomized clinical trial of 8,800 school-age children with high vitamin D deficiency showed no impact on growth or pubertal development after 3 years of weekly oral vitamin D administration. Vitamin D deficiency is associated with stunting and obesity in children.
Researchers at the University of Ottawa have discovered that patients with electrolyte abnormalities are twice as likely to be diagnosed with an eating disorder. This study analyzed Ontario health data between 2008 and 2020, identifying a potential preventative treatment for approximately 1 million Canadians.
A recent study found that ocean cooling over the past 100 million years led to increased body size in tetraodontiform fishes, adhering to Cope's and Bergmann's rules. The researchers combined genomic and fossil data to support this finding, which was previously less well understood for ectothermic species.
Clown anemonefish control their growth to match larger anemones, growing faster than fish on smaller anemones. This mutualistic interaction allows for optimized reproductive value in their environment.
A study published in Scientific Reports found that mammals with larger brains than similar-sized species were more likely to have survived extinction. The researchers investigated brain sizes of 291 living mammal species and 50 extinct species, discovering a significant correlation between brain size and survival.
A study involving 6,500 participants found a significant association between higher childhood body mass index and increased risk of premenstrual disorders. Young adults with higher childhood BMI experienced greater levels of premenstrual symptoms.
Researchers discovered a genetic mutation associated with small body size in dogs that also occurred in ancient wolves over 50,000 years ago. This finding presents a new evolutionary narrative and challenges the long-held theory that humans domesticated large wolves to create small companions.
A study of 744 Polish adults found that less than two thirds can correctly estimate their own BMI, with men underestimating their size more frequently. The research suggests that psychological interventions may help people better manage their weight by addressing body size perceptions.
Scientists at Stanford University have discovered a pattern in how life reemerges after mass extinctions. In the past half-billion years, smaller marine genera were substantially more likely to be wiped out during mass extinction events, but during recovery intervals, originators tended to be tiny compared to holdover species.
Researchers found that large hagfishes grow extremely large cells to produce stronger slime threads used in defensive attacks. The thread cells are highly dependent on body size and show a scaling factor of 0.55, much larger than other vertebrates.
Researchers discovered fossilized footprint tracks of straight-tusked elephants, indicating a Late Pleistocene nursery site in Huelva, Spain. The tracks suggest that young elephants, possibly up to two years old, were raised in this area, which may have provided a food source and reproductive habitat for female elephant herds.
A new study finds that urbanization is causing many mammal species to grow bigger, contrary to Bergmann's Rule. The study analyzed over 140,000 measurements of body length and mass from North American mammals collected over 80 years.
A new study by Durham University reveals that playing with ultra-thin dolls can negatively impact young girls' body image, particularly when combined with exposure to 'thin ideals' in media. The research suggests that this can lead to body dissatisfaction and potentially eating disorders.
A study of aquatic mammal body size evolution found that environments constrain body size more than terrestrial habitats do. The analysis suggested that thermoregulation and metabolism force aquatic mammals to grow larger than their terrestrial counterparts.
A new study of 311 hominin fossils spanning four million years shows that stature and body mass advanced at different speeds. Hominin bodies evolved in 'pulse and stasis' fluctuations, with some lineages even shrinking.
Researchers found that different parts of an organ grow at varying rates when the body changes size. This discovery could help understand how organs work and interact with each other to maintain animal health.
A new study by George Washington University researchers challenges the idea that early Homo genus evolved with an increase in body size. They found that early hominins were generally smaller than previously thought, and the increase in body size occurred later with H. erectus.
Researchers at the Universities of Cambridge and Tübingen have found that the main increase in body size occurred tens of thousands of years after Homo erectus left Africa, primarily in the Koobi Fora region of Kenya. This study suggests that human body size diversity arose much earlier than previously thought.
A research team from Instituto Gulbenkian de Ciencia found that the timing of ecdysone synthesis is sensitive to nutrition in fruit flies, regulating final body size. Environmental conditions such as starvation and temperature control ecdysone production, affecting development and growth.
A Honolulu-based study reveals that shorter men tend to live longer, thanks to a protective form of the longevity gene FOXO3. This gene is linked to smaller body size during early development and lower blood insulin levels, resulting in a longer lifespan. The study, which followed over 8,000 Japanese-American men for nearly 50 years, p...
A study published in PLOS ONE found that listeners gauge a speaker's body size from their voice frequency, quality, and formant spacing. Deep male voices and high-pitched female voices are perceived as more attractive due to their association with smaller body sizes.
A new analysis suggests that brain size relative to body size is driven by different evolutionary mechanisms in different animals, with changes in body size often occurring independently of changes in brain size.
A study by Duke University scientists found that low oxygen levels in caterpillars trigger a molt to the next stage of development, as their respiratory system is fixed in size. This discovery reveals a new factor regulating body size during specific developmental stages.
Researchers at UC Riverside found that female guppies that grew rapidly as juveniles produced fewer offspring than expected. This suggests long-term costs of early rapid growth and weight gain in adulthood, potentially impacting human reproductive success.
Research found that 8% of obese individuals perceive themselves as satisfied with their body size or believe they can gain weight. These misperceptions are associated with a higher risk of chronic diseases and lower likelihood of seeking medical care.
A new study suggests that high mortality rates in small-bodied people may be linked to their small stature. Researchers found that populations with high mortality rates experienced a decrease in height over time, while those with lower mortality rates remained stable.
A new study resolves a long-standing debate on dinosaur metabolism by using mathematical modeling and fossil data to estimate body temperatures. The results suggest that the largest dinosaurs had relatively constant body temperatures maintained through thermal inertia.
Researchers discovered that bacteria and elephants consume energy at a similar rate per unit mass, regardless of their body size. This finding suggests that living organisms can overcome physical limitations by adapting to their own biochemical characteristics.
Two studies found that manipulating ecdysone release timing and Ras activity regulates fruit fly development. The prothoracic gland acts as a size-sensing tissue, determining when metamorphosis should occur.
Researchers found a consistent relationship between ideal body mass for running performance and ground forces required at different speeds. Sprinters require more muscle and bulk, while endurance specialists need less due to lower ground forces.
The authors conclude that bodychecking should be banned in hockey until players are at least age 17 or 18 years old due to increased concussion and injury risks. Most physical growth occurs during this period, making it a critical time for protecting young athletes.
A University of Florida study found that most Americans consider mid-range body sizes attractive and socially acceptable. In contrast to the idealized thin figure often seen in media, participants preferred a range of builds from slender to rounded. As people age, they become more tolerant of varying body sizes.