Articles tagged with Population Dynamics
Climate change threatens Nigeria-Cameroon Chimpanzees with drastic habitat loss, including the savanna-woodland habitat of central Cameroon. The subspecies has only about 6,000 individuals in the wild, making it particularly vulnerable to extinction.
Researchers use light to control neurons in genetically-engineered mice, allowing for precise detection of odor dynamics. Mice demonstrate ability to discriminate between dynamic activities, suggesting neural population dynamics play a crucial role in the sense of smell.
Scientists develop model to predict which populations will go extinct due to climate change by analyzing how different species adapt. The study finds that small changes in climate can lead to sudden extinction, even for species with strong adaptation strategies.
Researchers prove climate change could not have caused population decline in Europe at the end of the Bronze Age. Human activity decline and social stress are likely causes of sudden fall in numbers.
The Urban Dynamics Institute at Oak Ridge National Laboratory is applying Big Data analysis to improve polio vaccination efforts in developing countries, particularly in Nigeria. The institute will help estimate vaccine needed and target areas of priority, saving time and money.
A new theorem provides a fundamental approach to estimate the age structure of any population, from fruit flies to humans. This discovery can be applied to predict rates of infectious diseases and anticipate healthcare needs. By understanding age distribution, researchers can better comprehend risks and make informed decisions.
A new framework by Aaron Stutz reveals that the human population explosion was rooted in ancient political and economic organization, with a tipping point around 1,500 years ago. This insight offers a fresh perspective on modern-day population dynamics and potential consequences for society.
Research reveals Ebola's profound effects on gorilla populations, including changes in reproduction, immigration, and social dynamics. Long-term monitoring is necessary to understand disease impacts on wildlife.
A new study by John Bongaarts found that mortality projections from low-mortality countries are overly pessimistic, as the decline in smoking-related mortality is not accounted for. This suggests that pension and healthcare costs will rise due to an aging population living longer.
Research from NOAA Fisheries reveals how a shift in prey species led to cod aggregating in a small area, making them easily caught by fishermen. This change affected fishery management and assessment results, highlighting the need for accurate indicators of stock abundance.
The latest issue of Reproductive Health Matters highlights the intersection of population dynamics and sustainability in development policies. The issue emphasizes the need to learn from history and avoid repeated mistakes in family planning policy and practice.
A mathematical model studies opinion dynamics in a population, considering factors like interaction with peers, media influence, and social media. The study provides insights into how information distribution affects societal opinions.
A 32-year study in Finnish Lapland found that 90% of moth species are stable or increasing, despite rising temperatures and precipitation. However, warmer temperatures reduced population growth rates, suggesting unknown ecological forces may be masking the negative effects of climate change.
Researchers at the University of Hawaii are studying copepods to understand their response to global climate change. They have published a transcriptome for the key North Atlantic copepod Calanus finmarchicus, which provides insights into population changes and may help predict future declines.
A study found that smoking prevalence among healthcare professionals decreased from 2003 to 2010-2011, with registered nurses showing the largest decline. Despite this, current smoking remained prevalent among healthcare professionals, particularly among licensed practical nurses, highlighting a continued need for tobacco interventions.
A new study found that minority students in the US are attending schools with fewer white classmates than in 1993. Despite increased diversity, the exposure of blacks and Hispanics to whites was higher than expected, according to researcher Jeremy Fiel.
Researchers confirmed Haldane's 90-year-old theory that new genes may get lost from populations but found it cannot predict the ultimate fate of beneficial alleles. Genetic diversity can be maintained indefinitely through complex population dynamics.
Researchers in Italy found a local low-cost information campaign significantly decreased antibiotic prescribing rates by 11.9%, outperforming the national decrease of 3.2%. The campaign's effectiveness was attributed to doctors' endorsement and increased awareness, not patient pressure.
Researchers found that neurotic men born after 1957 have fewer children, while extraverted men and conscientious women tend to have more. The study suggests personality effects may be contributing to the decline of fertility rates in Europe.
A recent study by Rice University researchers found that altering the dynamics of a population can have measurable consequences on complex ecosystems. The study's results suggest that changing the structure of populations can alter entire food webs and ecosystems, highlighting their fragility.
Researchers studied temperature-driven changes in tea tortrix population dynamics, finding that desynchronization leads to more synchronous outbreaks. A mathematical model predicts population cycles under constant and seasonally driven temperature regimes, shedding light on how temperature influences insect populations.
Researchers found that young lizards' early meals significantly impact their lives, influencing dispersal, growth, and survival. A single meal also affects reproductive success two years later, highlighting the importance of fleeting moments in shaping individual and population evolution.
A new study found that a yeast colony dominated by non-producers is more likely to face extinction than one consisting entirely of producers. The researchers discovered that even a small proportion of 'cheaters' can disrupt the social unit's survival, highlighting the central dilemma in the evolution of cooperation.
A recent study found that climate change disrupts the seasonal timing of songbirds, but density-dependent processes are helping to mitigate this effect by allowing some birds to survive and reproduce despite earlier or later food availability. This temporary rescue is buying time for evolutionary adaptation.
Researchers found rapid genetic changes in laboratory soil mites leading to population growth and increased fertility, rescuing populations from extinction. The study demonstrates the intertwined nature of ecology and evolution.
A University of Leeds-led study found significant genetic changes in soil mites after just 15 generations, leading to doubling of age at adulthood and large population size changes. This research demonstrates the interconnectedness of ecology and evolution, with major implications for conservation and fisheries management.
A new study reveals that some turtle populations are among the least likely to recover from climate change impacts. Protecting key regional nesting beaches and areas suitable for future nesting is crucial to enhance marine turtles' resilience.
A Dartmouth study suggests that increasing competitor and predator beetle populations can prevent population explosions of pine beetles, a major forest pest. The research confirms that some species, like the southern pine beetle, exhibit extreme fluctuations in abundance with no middle ground.
A study found that climate change is affecting boreal bird species populations, with some groups increasing in density while others are declining. The research suggests that habitat-specific responses to climate change may be driving these trends, with open mires and mountain heaths being more rapidly affected.
Researchers examine the effects of human activity on land modification, finding over 50% of Earth's surface has been transformed. This transformation influences local and global food production, leading to concerns about planetary resources and population overshoot.
Researchers funded by NSF found that changing climatic conditions, rather than tourism, are driving the decline in chinstrap-penguin populations. The study analyzed data from 1994-2011 and found a significant decline of 50% in breeding pairs at Baily Head since 1986-87.
Some desert plant species adapt well to climate change, benefiting from fluctuating weather conditions. This is contrary to predictions by climate models, which forecast unfavorable effects on ecosystems. Researchers found that these plants have a unique physiology allowing them to thrive in arid regions.
Countries prioritizing poorest groups show fastest progress in increasing maternal and child health coverage. Lead author highlights importance of equity in assessing overall coverage progress.
A study by University of Southampton researchers found that women are delaying motherhood due to longer periods of education and training. The average age of first-time mothers rose from 24 in 1974 to 27 in 2004.
A population-level approach to preventing cardiovascular disease could reduce deaths by up to 50%, according to the European Society of Cardiology. The organization recommends changes in agricultural policies, taxation, and advertising to support healthy diets, physical activity, and reduced alcohol consumption.
Climate models show that warmer beach conditions and increased frequency of hot years will lead to high egg and hatchling mortality rates among leatherback sea turtles. The eastern Pacific population is projected to decline by 75% by 2100, making conservation efforts crucial for their recovery.
A European team of ecologists used a new modeling approach to predict how mountain plants will migrate in response to climate change. The results indicate that by the end of the 21st century, Alpine high mountain flora will lose an average of 44-50% of its current distribution area.
A new study reveals a large number of emperor penguins in Antarctica, with 595,000 birds estimated, providing an important benchmark for monitoring environmental change. The research uses high-resolution satellite images to differentiate between birds and ice, allowing for accurate estimates.
A new study found that health disparities have grown dramatically among people in the same socioeconomic groups, often more than between groups. Researchers identified factors such as income instability and changes in population composition contributing to these growing disparities.
The UCLA-developed integral projection model improves predictions for species facing climate change by analyzing multiple data sources simultaneously. The model reveals that gradual environmental changes have a greater impact on populations than fluctuating changes.
Researchers at Imperial College London have developed a way to predict the impact of climate change on animal populations, body size and genetics. By analyzing data from 15 years of wolf population trends, they created a mathematical model that can be applied to other species with similar environmental data.
Researchers investigated the dynamics of virus populations in the human gut during dietary changes, finding that viral populations became more similar over time. The study provided new insights into the 'gut virome' and its response to diet, shedding light on potential health consequences.
A new population model explains Atlantic herring population trends driven by haddock egg predation. The study suggests that when haddock populations are high, conservative fishing efforts can trigger severe declines in herring populations due to predation on eggs.
A study published in Mammal Review found that fishing is the largest known human factor contributing to the decline of New Zealand's endangered native sea lion population. The team identified resource competition and by-catch incidents as the primary causes, leading to a 40% breeding decline on Auckland Islands.
Diabetes rates are higher in Aboriginal adults in Alberta, but the increase is less pronounced compared to the general population. Mortality rates for status Aboriginals with and without diabetes have remained relatively unchanged over 12 years, despite overall improvements in mortality rates among people with diabetes.
A global review of research on stature and health during the agriculture transition found consistent trends of declining height and health globally. The study, published by Emory Health Sciences, analyzed data from various world regions and cultures, revealing a link between early agricultural practices and reduced adaptability to stress.
A new study estimates that over 19 million people will be affected by rising sea levels in four regions by 2030. The analysis highlights the importance of considering population movement patterns and demographic vulnerability to better understand environmental impacts.
A 440-year-old document reveals that the Andean population in Peru bounced back briefly after initial Spanish invasion but declined due to repeated disasters, rigid administration and epidemic disease. The census data challenges long-held assumptions about indigenous population decline in the Americas.
A 360-million-year-old mass extinction event devastated fish populations, allowing crinoids to thrive and diversify. The study found that the ripple effects of this extinction event could last millions of years.
The updated studies will provide long-term projections and help researchers identify new trends using 2010 census data. This living resource will be available online and continuously updated to inform policymakers.
Researchers found a link between the fur trade routes and modern-day patterns of tuberculosis. The particular TB strain was introduced to remote Aboriginal populations in Canada by French Canadian fur traders during this period.
Belovsky's study reveals that grasshopper behavior changes with the threat of predators, affecting survival and reproduction. At low densities, reduced feeding increases survival, but at higher densities, it worsens food shortages.
A study confirms that climate change is causing rapid environmental fluctuations, resulting in 'bluer' environments and higher extinction risks for animals. The research links temperature changes to population dynamics, with bluer populations indicating faster oscillations and lower extinction risks.
Researchers from North Carolina State University discovered that craniofacial features of men and women have become less pronounced in Spanish skulls spanning four centuries. The study highlights the changes in facial structure among females, which may be attributed to improved nutrition or environmental factors.
A UBC study found that certain populations of Fraser River sockeye salmon are more likely to adapt to changing environmental conditions due to their unique migration routes and specialized physiological adaptations. These findings have implications for conservation efforts in other watersheds worldwide.
Virginia Tech forest researcher Jason Holliday has received a $1.5 million NSF grant to investigate how tree populations adapt at the genomic scale in response to climate change. The study aims to improve breeding applications for poplar planting stock in a changing climate.
New research reveals that native residents are more likely to leave neighborhoods with growing immigrant populations, with decreasing homeownership rates and increasing housing costs playing a role. Meanwhile, large concentrations of immigrants outside the neighborhood reduce the likelihood of native black and white residents leaving.
A new research agenda prioritizing baseline data for marine species is needed to diagnose population recovery after the Deepwater Horizon oil spill. The authors emphasize focusing on endangered species and economic impacts to inform management strategies.
The Florida Keys bonefish census showed a 25% decline in bonefish population, with only about 240,000 fish found compared to an 8-year average of 316,805. The decline may signal broader ecosystem problems and requires careful future monitoring.
Horseshoe crabs, considered living fossils, face population decline due to climate-driven habitat destruction and overharvesting. Their genetic variation reveals sensitivity to natural climate change, posing a significant threat to their survival.