Articles tagged with Population Dynamics
Removal of just 15 females from thresher shark populations annually could lead to population decline and even extinction. The study used stereo videography to monitor the population and found fragility in their behavior.
A young female fisher traveled 118 kilometers from Durham to the White Mountains in New Hampshire, the longest recorded dispersal for the species. This journey, documented over winter with deep snow, underscores the fisher's adaptability and highlights the need for further research into movement patterns.
A new study finds Golden Eagles in Nevada at risk due to high mortality rates and habitat loss, potentially drawing in birds from other areas. Conservation efforts, such as maintaining natural habitat structure, are crucial to mitigating these impacts.
Research reveals West Coast transient killer whales are two distinct subpopulations, differing in diet, hunting grounds and social behavior. The inner coast transients are expert navigators of nearshore inlets, while the outer coast whales thrive in deep canyons and rugged underwater terrain.
A University of Maryland-led study found that wild canids create and stick to specific travel routes within their territories, while felids tend to roam more freely. The research challenges traditional assumptions about animal movement and has implications for conservation and management of at-risk mammalian carnivores globally.
Researchers found that the caterpillars' cycles interact with natural controls like viral disease, and they're highly adapted to their environment. Outbreaks can be predicted and damage controlled, but the exact timing is linked to specific factors.
Bird populations in the tropics have dropped by roughly a third since 1980, with some species experiencing declines of over 50%. The study highlights the impact of extreme heat on bird mortality, fertility, breeding behaviors, and offspring survival.
A study of 25 years of behavioral observations found that gorillas' aggression is shaped by their individual needs and social environment. Pregnant and lactating females directed more aggression towards more powerful group members, while females with more males in the group targeted less powerful opponents.
Research suggests that the intention to have a child is complicated and nuanced, with many women uncertain about their ability to meet this goal. Women with higher education and income levels are more likely to say they will have children, but even those with a bachelor's degree show a decline in certainty over time.
Researchers found that birds of similar age tend to have more similar repertoires, while mixed-age neighbourhoods exhibit higher cultural diversity. The pace of song turnover is driven by individuals coming and going, with older birds serving as 'cultural repositories' of older song types.
A new study found that wind power projects in Oregon and Washington alter the structure of nesting raptor communities. Golden Eagles and Ferruginous Hawks declined in abundance, while Great-horned Owls increased. The research emphasizes the need to consider community composition in raptor conservation.
A new USC study reveals that the US is facing a shortage of 4.5 million homes due to policy missteps in the early 2000s, which led to a historic housing bubble and subsequent Great Recession. The crisis has disproportionately affected millennials and people of color, with racial and ethnic disparities in homeownership widening over time.
A new study assesses the sustainability of varying Pacific walrus harvest rates under different climate and human disturbance scenarios. The research finds that current harvest levels are within a sustainable range if assessed regularly and adjusted accordingly.
Large-scale declines in African elephant populations have been confirmed over 53 years of survey data. Forest elephant populations decreased by 90%, while savanna elephant populations fell by 70%. The study, published in Proceedings of the National Academy of Sciences, provides a comprehensive assessment of African elephants and highli...
Climate change affects deer populations by altering their physiology, behavior, and distribution. As temperatures rise, some species adapt to milder winters, while others struggle with heat stress and parasites.
A study of UK-based Twitter tweets found that the top 1% of users generated 23% of anti-immigration content, with anti-immigration tweets spreading 1.66 times faster than pro-immigration ones. This concentration of power among a few users highlights the need for efforts to curb online hate content.
A recent study suggests that fear of conflict significantly impacted the development of prehistoric European societies, leading to population declines and concentrations in safer locations. The researchers' computational model matches archaeological evidence, providing context for future refinements to modeling.
A new study led by the University of Arizona finds that early-life struggles can cut adult lifespan in red squirrels by at least 14%, but a natural food boom may buffer against these effects. The researchers suggest that climate change could disrupt this dynamic, potentially affecting animal resilience.
A new study projects the impacts of increased migration on Austria's labor market and economy. The research reveals a positive effect on economic growth but significant variations in unemployment across different cohorts.
Research suggests that warmer fall seasons may lead to colony collapse in honey bees due to increased flying time. However, cold storage for colonies could help reduce the risk of colony collapse by allowing bees to cluster earlier and save workers.
A new study on sea anemones sheds light on the complex relationships between predators and prey in marine ecosystems. The research found that a native population of anemones lacking a key neurotoxin exhibited weakened defensive abilities, while its presence attracted natural predators of grass shrimp.
A new study by UMass Amherst and the Wildlife Conservation Society finds that climate change disproportionately affects older African elephants, who will have decreased chances of survival. This can lead to a ripple effect on their ecosystems and cultures, highlighting the need for coordinated management strategies at all levels.
Researchers at Oregon State University discovered that marine heat waves trigger earlier reproduction and high mortality in early life stages of Pacific cod. The study found these changes persisted in subsequent years, potentially impacting the future of Gulf of Alaska's Pacific cod population.
Researchers developed a model demonstrating that chasing interactions can induce dynamical patterns in bacterial organization. The structure becomes visible on a higher level, without requiring adhesion or alignment.
Augusta University researcher Arni S.R. Srinivasa Rao calls for updating the UN's traditional approach to measuring population replacement levels. He proposes a new formula that allows for more timely and accurate measurement, which is essential for understanding emerging global demographics.
Researchers at the Complexity Science Hub found that periodic outbreaks of warfare can account for boom-bust patterns in population dynamics of early farming societies. The study suggests that social conflict played a crucial role in shaping the population dynamics of these societies, contrary to previous assumptions that climate chang...
A study found that certain pteropod species in the Southern Ocean are vulnerable to climate change due to varying life cycles. The research suggests that population stability is essential for species survival and that prolonged exposure to unfavorable conditions may jeopardize future populations.
A study at Kyoto University has demonstrated the computational power of ecological networks, providing a new direction for rapidly developing AI technologies. The researchers developed two types of ecological reservoir computing that efficiently process information and can be utilized as a computational resource.
A genetic census has been used to estimate the number and population structure of critically endangered western chimpanzees in West Africa. The analysis identified a total of 136 chimpanzees living in four different communities, with high levels of shared ancestry and genetic diversity.
Researchers found that bacteria's cooperative behavior helps in the short term but fails to protect them from predators. However, individual defense through filament formation proves successful and stabilizes bacterial population densities.
Research suggests that alternating years of low and high acorn production contribute to an increase in wild boar populations. Biennial episodes of acorn production coincide with the generation time of wild boars, leading to positive population growth.
A new study finds epigenetic aging is associated with aberrant neural oscillatory dynamics serving visuospatial processing in people with HIV. Participants showed accelerated biological age and different brain activity patterns compared to controls, suggesting a link between biological aging and neural function in PWH.
Research suggests that the ratio of adult females to males influences sex roles in animal species. Variation in this ratio can lead to differences in mate competition, parental care, and social behavior among species. The study proposes that understanding these dynamics can inform conservation efforts.
Researchers found that short-term changes in health of juvenile sockeye salmon are related to the quality of zooplankton, not biomass or composition. This highlights concerns about climate change affecting ocean conditions and salmon populations.
Researchers at the Max Born Institute have used novel ultrashort soft X-ray spectroscopy to study the fate of molecular nitrogen when an electron is kicked out. They found that the B state has a similar degree of excitation as the X state, contradicting previous models. Instead, a coherent interplay between light fields enables lasing ...
A Hebrew University study reveals that desert isopods, when predators like scorpions are nearby, prefer larger females but settle for smaller ones instead. Males also adjust their behavior, with smaller males opting for second-best females closer to the predator.
A new study from the University of Waterloo highlights the need for Toronto's public transit system to improve its accessibility and affordability to retain vulnerable users. The researchers recommend a reassessment of travel networks, equitable pricing, and enhanced safety measures to connect core riders better with the rest of the city.
A research group from Nagoya University found that large-scale flowering and seeding of dwarf bamboo boosts Japanese field mouse populations, especially in mast years. The team's study showed an increase in both large and small mouse populations two years after the event, indicating good breeding conditions.
Machine learning helps researchers discover how bacterial populations adapt to environmental diversity by analyzing growth curves. The analysis reveals distinct decision-making components for lag, growth, and saturation phases, protecting the population from extinction.
A new study from North Carolina State University shows that soil temperature can be used to predict the spread of the corn earworm, an important pest affecting various crop species. The research reveals three geographic zones where the pest can overwinter, and models suggest that these zones will shift northward due to climate change.
A study by OIST Graduate University's Marine Biophysics Unit found that mangroves in the Ryukyu Islands have limited connectivity, making it crucial to protect isolated forests. The research used genetics and oceanography to track propagule dispersal, revealing rare genetic exchanges between islands.
Researchers developed a new quantitative RT-qPCR assay to detect and quantify the Omicron variant of SARS-CoV-2 in wastewater. The assay revealed that Omicron displaced Delta as the dominant variant within just 3 weeks in an Italian population.
A national survey of 1000 adults in Greenland found that 3 out of 4 support extracting and exporting sand from the melting ice sheet, with most preferring local involvement. The study highlights a rare example of an Arctic Indigenous population wanting to be involved in decision-making about adapting to accelerated Arctic changes.
Scientists analyzed UK bumblebee populations and found evidence of increasing stress due to climate change, with higher asymmetry in wing shapes linked to hotter and wetter years. The study used ancient DNA methods to determine genetic diversity loss and adaptability of bee genomes over time.
Researchers at the University of Tennessee are investigating the movement of amphibian pathogens in wildlife trade networks, with a focus on disease mitigation strategies. The project aims to understand how socio-economic factors impact pathogen dynamics and develop market-based mechanisms to promote healthy trade.
Employment-to-population ratio for people with disabilities decreased from 34.9% in June 2022 to 34.4% in July 2022. Labor force participation rate also decreased, but remains above pre-COVID levels and historic high of 2008.
A team of scientists developed a computational model that explains Italy's town distribution using only a small set of mathematical equations and a map of the landscape. The model simulates how population and road networks interact, demonstrating that landscape alone is insufficient to explain population distribution.
Researchers investigate how foraging adaptations affect Arctic charr resilience to climate change. The team aims to develop a framework linking genetic and malleable components of feeding trait diversity to population demography, habitat, and eco-evolutionary potential.
A new study found that coral spawning events at deeper depths occur at lower intensities than those in shallow waters. The researchers suggest that deep reefs may more often rely on shallow-reef corals to survive.
A study found that pandemic restrictions negatively affected mental wellbeing, with workplace closures being the only positive effect. Women and young people were disproportionately impacted, highlighting disparities in mental health outcomes between social groups.
A study led by ICM-CSIC finds that mass mortality events caused by marine heatwaves affected all Mediterranean regions between 2015 and 2019, resulting in recurrent mass mortalities throughout the period. The research highlights the significant positive relationship between the duration of heat waves and the incidence of mortality events.
A new study by researchers at the University of Oxford found that ageing female wild red deer on the Isle of Rum in Scotland tend to adopt a life of solitude as they grow older. They interact with fewer other individuals within their home ranges and shift to less populated areas of their habitat.
Researchers examine the relationship between thermal biology and sexual selection, finding that animals often tolerate perilous temperatures during mating to increase reproductive success. The study highlights the importance of considering scale in understanding the impact of global warming on reproductive processes.
At least 30 out of 114 North American bird species have become less well-adjusted to their climate over the last 30 years, according to a recent study. Climate decoupling, where species distributions and abundances diverge from climate conditions, is particularly prominent among habitat specialists.
Researchers have discovered a selfish genetic element, known as Segregation Distorter (SD), that skews genetic inheritance. SD has caused dramatic changes in chromosome organization and genetic diversity, leading to the accumulation of deleterious mutations.
Researchers found that New Caledonian humpback whales can learn and accurately sing songs from Australian counterparts with remarkable accuracy. This cultural transmission is rare in non-human species and provides insight into the evolution of cultural communication in animals and humans.
A new study by Bocconi University researchers found that Google searches are an effective tool to track and predict domestic violence, especially in crisis situations. The study analyzed keywords related to domestic violence and found a positive correlation with calls to the Italian helpline and emergency number.
A new UBC study finds that southern resident killer whales have been in an energy deficit for six of the last 40 years, with three recent years (2018-2020) being particularly dire. The researchers attribute this decline to lower Chinook salmon abundance and size, which are the primary food source for these whales.
Scientists analyzed over 30% of populations in an ecological database and found evidence of chaotic dynamics, contradicting previous findings. The research suggests that intrinsic limits exist to ecological forecasting and caution against equilibrium-based approaches for conservation and management, particularly for short-lived species.
A new study reveals that population declines have been greatest among species that migrate to areas with more human infrastructure, habitat degradation, and climate change. The research identified 16 human-induced threats to migratory birds, including infrastructure associated with bird disturbance and collisions.