Articles tagged with Population Dynamics
Researchers used drones to estimate hippo numbers in the Okavango Delta, northern Botswana, and found the method to be just as effective as traditional land surveys. The drone's bird's-eye perspective allowed for accurate counting of individual hippos, even when they were crowded together.
New research reveals how Antarctic penguins adapted to a century of human impacts, including whaling and climate change. Gentoo penguins thrive on fish and squid, while chinstrap penguins struggle with declining krill populations.
Researchers argue that climate change has a disproportionate impact on disabled populations, limiting access to knowledge and resources. The study highlights the need for urgent research into the intersection of disability rights and climate change.
A study of 127 ancient individuals' genomes found two major ancestry shifts, one during Neolithic farmers' arrival and another during the Bronze age. The results suggest that by Rome's founding, central Italy's genetics were similar to modern populations, but genetic diversity increased over time.
A recent study led by Boston College researcher Nadia Abuelezam found little evidence of the 'immigrant health paradox' among Arab Americans. In contrast to previous research on Asian and Latino immigrants, first-generation Arab immigrants had poor health profiles compared to second- or third-generation immigrants.
Researchers argue that viewing past human populations as discrete branches on an evolutionary tree is misleading and instead propose a dynamic changes in connectivity model, which better explains genetic diversity and fossil records. This shift in understanding could address complex questions in human evolutionary studies.
Scientists analyzed nearly five decades of data on over 5,800 saguaros to predict how the desert species will fare in hotter climates. They found that small variations in topography can buffer saguaro populations from harsh conditions.
Researchers found that climate change has a net zero effect on Svalbard barnacle goose populations, with benefits from warmer springs offset by increased predation. Warmer winters also led to increased egg production and gosling survival, benefiting both geese and predators like Arctic foxes.
A recent study analyzing over 10,000 scientific studies found that species are not adapting fast enough to cope with climate change. The research team identified phenological traits, such as shifting hibernation and reproduction dates, in temperate regions, where changes occurred more commonly.
A new approach predicts US population and income changes at the level of individual counties, enhancing understanding of potential climate change scenarios. The model accounts for labor migration and various social and economic factors.
A study by NOAA researchers has identified four Pacific salmon population groups as especially vulnerable to climate change, including Chinook in California's Central Valley and sockeye in Idaho's Snake River basin. The populations face threats from elevations in stream and sea surface temperatures as well as ocean acidification.
A study by D. André Green found that cold temperatures speed up the monarchs' internal timer, allowing them to terminate diapause and prepare for spring migration. The research suggests that cold temperature plays a critical role in regulating the timing of biological processes in monarchs.
A recent study published in Trends in Ecology and Evolution reveals the alarming impact of bark beetles on timberlands across Central Europe and North America. The beetles' population growth is linked to climate change, which exacerbates the problem by weakening German timberlands.
Researchers at the University of Basel's Biozentrum have discovered a new group of nerve cells in the red nucleus that changes with fine motor tasks. Practicing grasping movements strengthens connections between neurons, optimizing movement and storing it in the brain as a code.
A study found that earlier snowmelt timing reduces subalpine plants' seed production, threatening their long-term survival. Climate change poses a significant threat to these populations, even without noticeable changes in bloom timing.
The study found that Americans spent more time sitting, with 62% of children, adolescents, and adults watching TV or videos for at least 2 hours a day in 2015-2016. The proportion of people using computers during leisure time increased across all age groups from 43% to 56%.
A study comparing genome data from 55 ethnic groups in Russia found a common origin for populations in Pskov, Novgorod and Yakutia. The research used genetic data to trace the development history of these populations, revealing they were once part of a single ancestral population.
A recent study by LMU biologists found that personality differences among great tits affect their breeding timing. The more daring birds breed later but earlier when threatened, while less valiant pairs delay breeding until the threat passes.
Svalbard reindeer population behaves counterintuitively under harsher climate scenarios, with high density and competition leading to population crashes. However, the population's internal restructuring and age structure buffer the effects of climate change, allowing them to survive in a warming environment.
A study analyzed biomarkers in bird feces from pond sediment cores to reconstruct seaduck population changes throughout the 20th century. The analysis revealed long-term declines in seaducks across colonies facing high hunting pressure, likely linked to Inuit community relocation and gun introduction.
The study found that higher summer populations on northern breeding grounds correlated with larger Mexican winter colonies. Autumn temperatures and disease rates were not significantly associated with winter population sizes.
Scientists assess how meerkat populations will fare in response to future changes in seasonal rainfall and temperature. The study found that hotter summers may threaten the persistence of meerkat populations, but warmer winters can alleviate negative effects.
A recent study found that Antarctic krill populations have shifted southward due to warming in their key habitat, posing major implications for the food web and biogeochemical cycling. The team analyzed data from scientific surveys spanning nearly a century and found a substantial change in the krill population over time.
A study published in PLOS ONE found that 78% of marine mammal populations and 75% of sea turtle populations increased significantly after being listed under the U.S. Endangered Species Act. Conservation measures such as tailored species management and fishery regulations appear to have been successful in promoting species recovery.
A new mathematical model developed by University of Southern Denmark researcher Fernando Colchero can help predict the population growth of endangered species. The model takes into account age-specific survival and reproduction rates, as well as trade-offs between these factors, resulting in more accurate predictions.
Researchers found that female Magellanic penguins are more likely to be stranded along the South American coast due to their northward migration. The study suggests that females are at greater risk of encountering threats such as water pollution and marine transport hazards, leading to increased stranding.
A study by University of Washington researchers reveals that rising single male Magellanic penguins are a result of higher juvenile female mortality and population decline. The data suggests that protecting the penguins' food supply during non-breeding seasons is crucial for conservation.
Conservation efforts rely heavily on estimates of animal populations, but monitoring periods are often short due to funding cycles and experimental time frames. Research by Easton R. White suggests that 72% of species require at least 10 years of continuous monitoring for high statistical power.
Research suggests that frogs from virus-exposed groups are breeding at significantly younger ages than those in disease-free populations. This decrease in breeding age poses a risk of local extinction due to environmental changes.
New research from the University of East Anglia reveals that heatwaves can halve male reproductive fitness, reducing offspring production by three-quarters. The study found that heatwaves also damage inseminated sperm within female reproductive tracts, leading to reduced fertility and population viability.
The world's population is expected to be larger, heavier and eat more by 2050 due to population growth and changes in eating habits. According to researchers, an average adult today requires 6.1% more energy than in 1975, leading to increased food demand.
Scientists have documented how individual side-blotched lizards can change colors to become darker on lava; they identified genes that regulate coloration and found genetic changes in the population adapted to the lava flow. These findings provide a detailed example of the Baldwin effect occurring in a wild population.
A long-term monitoring program for Australian fur seals has tracked a decline in pup populations, with the first reduction since species-wide protection was implemented in 1975. The study highlights the importance of regularly assessing monitoring programs and provides valuable information on how to improve them.
Researchers use automated systems to collect around-the-clock data on bacterial populations, finding that more frequent feast cycles lead to faster recovery from famine states. The team uncovers the mechanism behind this phenomenon, attributing it to dispersal of cells during feast conditions.
Researchers introduce concept of 'live' process emerging from interactions between molecules and environment, identifying earliest hallmark of life. They suggest this process could lead to emergence of complex living organisms with characteristics currently known.
A team of multidisciplinary researchers provides novel insights into parenting and diversity, identifying common themes and future directions for research. The study sheds light on the impact of increasing population diversity on parenting adolescents, offering new ways of thinking about parenting.
A growing global population contributes to rising greenhouse gas emissions, while nearly 85 million unintended pregnancies annually exacerbate the issue. Including population information in future IPCC assessments could facilitate more effective climate policies.
A large study found that delaying hip fracture surgery beyond two days increases postoperative mortality. The researchers suggest adopting a 'don't let the sun set twice' policy for timely access to the operating room, which could avoid up to 16.5% of in-hospital deaths.
A study by ISGlobal reveals a decline in heat-related mortality in Spain, contrary to expectations of increased deaths due to rising summer temperatures. The Spanish population has adapted to the change, reducing its vulnerability to high temperatures through various socioeconomic factors.
Researchers predict Acadian flycatcher populations will decline substantially due to reduced breeding productivity and increased nest predation under severe warming projections. Climate change poses a significant risk of quasi-extinction to this common Midwestern songbird species by the twenty-first century.
A new study by Portland State University reveals that climate change impacts tree growth rates vary among widely distributed tree species in different regions of Patagonia. The research found that warmer conditions and changes in storm tracks led to altered precipitation patterns, favoring tree growth in some areas over others.
Researchers have linked the ecology of adult fish populations inhabiting coral reefs with the dispersal of baby fish between reefs, revealing a complex network called a marine metapopulation. The study found that successful larval dispersal was crucial for replenishing key reefs.
Researchers used population dynamics modeling to assess the effects of size-specific and age-specific harvesting of Atlantic cod on the eastern Scotian Shelf, Canada. Fishing practices were found to drive a significant increase in cod habitat deepening, with depths of up to 120m accounting for nearly 100% of observed changes.
A new study suggests that no civilization can sustainably survive climate change, with four possible scenarios emerging: die-off, sustainability, collapse without resource change, or collapse with resource change. Researchers used mathematical models to analyze the co-evolution of civilizations and planets.
Researchers investigate how populations across different locations respond to environmental changes, aiming to improve fisheries management and conservation. By analyzing hierarchical dynamical systems, the study sheds light on species populations and predicts factors that increase the risks of extinction.
Fecal stanols, organic molecules found in sediment, provide a more accurate clue to past population sizes. The study found Cahokia's population peaked early and slowly declined, contradicting collapse theories.
A study from Indiana University finds that white flight occurs when nonwhite residents move into a neighborhood, regardless of socioeconomic factors. Once a community reaches a certain threshold of diversity, white flight becomes more likely, with areas losing an average of 40% of their white population over a decade.
Scientists have found that high carbon dioxide levels cause squid to bungle attacks on their prey, leading to a 20% decrease in successful hunts. This effect is observed across two cephalopod orders, suggesting that many species may be impacted by rising CO2 levels in the oceans.
A recent study published in Biological Conservation shows that eBird citizen science data accurately tracks trends in government bird surveys, filling data gaps in developing nations. The analysis, led by University of Utah researcher Joshua Horns, reveals significant declines for 48% of North American bird species over the past 20 years.
A new study led by researchers from the Woods Hole Oceanographic Institution has discovered a supercolony of over 1.5 million Adélie penguins in the Danger Islands, off the Antarctic Peninsula's northern tip. The population appears to be resilient to climate change, providing valuable insights for future monitoring and conservation eff...
A USC-developed algorithm can better locate and treat people living with undiagnosed infectious diseases, such as TB and gonorrhea. The algorithm optimizes disease spread models using behavioral, demographic, and epidemic trends to capture underlying population dynamics.
A Michigan State University study reveals that the endangered piping plover population may decline over the next decade due to increasing predator pressure. The researchers developed an integrated population model coupled with a Bayesian population viability analysis to improve accuracy in forecasting population changes.
The California sea lion population has fully rebounded under the Marine Mammal Protection Act (MMPA), reaching carrying capacity in 2008. The species' recovery reflects an important success for the MMPA, which recognized marine mammals as a central element of their ocean ecosystems.
A 40-year study on Isle Royale moose reveals a 16% decline in skull size, indicating smaller individuals and shorter lives, likely linked to climate warming. The population's growth may be an imbalance in the predator-prey dynamics, with wolves' decline contributing to malnutrition.
Researchers developed a novel method to infer microbial interactions using steady-state data, avoiding perturbations and potential ethical concerns. The approach allows for accurate network inference without requiring population dynamics modeling, enabling better understanding of microbial ecosystems.
A new study found that albatross populations have halved over the last 35 years on Bird Island due to environmental change and deaths in longline and trawl fisheries. Climate change and bycatch were found to be major contributors to this decline, with grey-headed albatrosses being particularly affected.
Recent studies on passenger pigeon genomics reveal surprisingly low genetic diversity despite large populations. The study suggests that high adaptability allows faster evolution, but also drives a loss in genetic diversity, making the birds more vulnerable to extinction.
A large observational study of nearly 49,000 Malaysian heart attack patients found a significant 10-year decline in blood cholesterol levels. This trend is opposite to the national average and suggests that statins may be responsible for the decrease in cholesterol levels among ACS patients.
The study found that Laos' elephant population, which has dropped by half in the last 30 years, depends heavily on socio-economic practices. Implementing a 'maternity-leave' system for owners could help offset losses and promote breeding, potentially saving the species.
A study links population growth to increased social cost of carbon dioxide and potential savings in climate mitigation costs by reducing emissions. The model suggests that minimal population growth can lead to substantial annual savings.