Articles tagged with Natural Populations
Fossilized shark scales from Panama's Pacific and Caribbean coasts provide a window into ancient shark populations. The study reveals that the two regions once supported vastly different densities of sharks, with the Pacific coast having roughly 20 times more sharks than its Caribbean counterpart.
A study found that mountain lion visits to a small preserve led to changes in deer activity, vegetation growth, and the presence of smaller predators like coyotes and foxes. This 'ecology of fear' demonstrates the ripple effects of apex predators on ecosystems.
Researchers found that pregnant Pacific pocket mice trained to fear snakes produce more vigilant offspring, which survive better in the wild. This method of antipredator training may improve conservation breeding and reintroduction programs.
Researchers can now estimate genetic diversity of dolphins using environmental DNA (eDNA) from seawater samples, providing insights into population size and vulnerability to environmental changes. The study's findings suggest that repeated eDNA sampling can be used to monitor the health of dolphin populations.
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 study led by Dr. Frédérik Saltré suggests that sterilizing 22% of adult females annually could stabilize the population at an estimated cost of $34 million over 25 years. This approach prioritizes both animal welfare and ecosystem health, offering a humane solution to the unsustainable koala numbers.
Researchers found that rats contributed significantly to Rapa Nui's deforestation by consuming palm nuts, preventing trees from regrowing. The islanders cleared land for agriculture and used slash-and-burn practices, but the slow-growing palm trees made them vulnerable to rat predation.
Low to moderate-severity fires boost bird populations with effects lasting up to 35 years, contrary to traditional fire suppression practices. Forest managers can use controlled burns and pyrodiversity to benefit majority of birds in the forest.
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.
A study by Bielefeld University reveals that common wall lizards behave far more socially in urban areas, maintaining multiple contacts and developing stronger bonds due to the city environment's structure.
A new study analyzing the dietary choices of wild woodrats reveals that individual diets may not be as diverse as previously assumed. The research suggests that the costs of specializing on one food source or diversifying one's diet have a strong impact on an animal's ability to survive and thrive.
A long-term study in southeastern Madagascar found that protected forest fragments improve the survival of endangered mouse lemurs. The study suggests that habitat protection is critical for conserving this species.
A recent study found that behavioral flexibility is related to foraging breadth, not social or habitat use behaviors, in great-tailed grackles rapidly expanding their geographic range. The researchers discovered that flexible individuals switched between different food types more often in the wild.
Researchers at the University of Illinois are working to bring back biodiversity to the Midwest by analyzing commercially sold seeds and plants. They found that long-lived species were more available than sensitive ones, and certain plant groups were over- or underrepresented in commercial seed mixes.
A new study by Griffith University highlights the need to rethink wildlife tourism and move away from objectifying animals. The researchers argue that even non-consumptive wildlife tourism can result in harm if it distorts public perception of animals.
Northern Arizona University is taking stock of its 5,000-6,000 trees to advance sustainability and carbon sequestration. The project will provide hands-on research opportunities for students and shed light on the trees' ability to mitigate climate change.
New research reveals evolutionary reversal in island plants where wild-growing tomatoes on western islands produce alkaloids similar to those found in eggplants. The study suggests that environmental conditions may be driving the reversal, and this phenomenon could have implications for human evolution and nature's ability to adapt.
A global research team tracked over 100 species of marine animals, revealing key migration patterns and hotspots critical for conservation. The study, MegaMove, uses satellite data to inform a new blueprint for ocean conservation, highlighting the need for targeted mitigation efforts.
Researchers found a total of 2,829 genetically defined species, with bacteria richness being 10.3 times greater than eukaryotes. The study revealed previously unknown associations between bacteria and eukaryotes, suggesting novel mutualisms that may promote nutrient exchange.
A recent study on the Haenyeo divers from Korea found that they have distinct genetic adaptations, including gene variants associated with cold tolerance and decreased blood pressure. The researchers also discovered two unique gene variants in the Haenyeo population that may help them cope with the pressures of diving.
A new study from the University of Kansas reveals that studying spatial synchrony over a long enough timescale leads to better testing of ideas, improved statistical results, and new conceptual realms for understanding ecology. Long-term data can expose ecological trends and inform policy and management related to the environment.
A new study analyzing over 175 scientific reviews found that agricultural intensification is a major driver of insect decline, but climate change has multiple individual drivers such as extreme precipitation and temperature. The research highlights the need for a multi-pronged approach to conserve insect biodiversity.
New research suggests that conservation efforts can better protect bird species at greatest risk from climate change by understanding the specific climatic conditions they need to thrive. The study found that species with narrower climatic niches are more susceptible to population declines.
Researchers at the University of Maryland discovered a way to predict treatment success for cutaneous leishmaniasis, a devastating skin infection. By analyzing a patient's immune system, they identified a distinctive pattern that distinguishes responders from non-responders, with 90% accuracy.
Researchers from North Carolina State University found that red meat is the most effective bait for detecting weasels, with salmon oil adding to its allure. The study aimed to address the lack of standardized monitoring protocols for weasel populations and provides a framework for future surveys.
Researchers have developed a more efficient method to monitor the olive fly population, enabling growers to make informed decisions on pest control. The new system uses small double-sided yellow adhesive panels, distributed at 4-15 traps per hectare, to accurately estimate olive fly numbers and damage.
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 published in Science tallies butterfly data from over 76,000 surveys across the US, revealing a 22% decline in total butterfly abundance between 2000 and 2020. This alarming rate affects 554 species, with 107 experiencing population losses of more than half.
A Rice University study has found that rising temperatures exacerbate competition within populations, leading to population crashes. This research provides a critical link between temperature increases and declines in species populations, shedding new light on the threats posed by global warming.
Research by Montana State University ecologist Diane Debinski found that eastern monarch butterflies are delaying their fall migration, staying in the field for nine days longer than they did in 2003. This delay was linked to a similar shift in the timing of milkweed blooming, which could have implications for population dynamics and v...
Researchers at Texas A&M University have developed a low-cost technology using curcumin to curb bacterial resistance. The study shows that photodynamic inactivation can trigger deleterious reactions within bacteria, killing them and reducing the number of antibiotic-resistant strains.
Researchers at Tokyo University of Science have found that opioid delta-receptor agonists can alleviate stress-induced IBS symptoms in a validated mouse model by targeting the central nervous system. The study suggests that these drugs could provide a more definitive solution for IBS with minimal adverse effects.
A study by University of Toronto researchers links polar bear population decline to extended energy deficits caused by a lack of food on dwindling sea ice. The model, tracking the bears' energy balance, shows reduced reproduction and cub survival rates due to shorter hunting seasons.
A deadly ciliate parasite has decimated sea urchin populations in the Caribbean, Red Sea, and Indian Ocean, with mortality rates reaching over 90%. The International team of researchers is working to track the disease and preserve sea urchins, which play a crucial role in maintaining coral reef health.
Borealis Mud Volcano provides a hard substrate for various species like anemones and octocoral colonies, sustaining local fish populations. The volcano's carbonates also offer shelter and feeding opportunities.
Researchers argue that zoos should adopt a rational approach to population management, balancing education and conservation goals with the reality of animal mortality. Planned culling can help maintain self-sustaining populations and reduce carbon footprint by utilizing in-house meat supplies.
A recent study analyzed genomic variation distribution, genetic diversity, and heterotic group types in modern maize inbred lines. The research found new potential heterotic groups and identified elite breeding loci for traits like yield, plant architecture, and stress resistance.
A recent study suggests coral heat tolerance adaptation may not keep pace with ocean warming, and some sensitive species may face extinction. The research modelled different climate scenarios, revealing that natural selection may be insufficient to ensure coral survival under expected warming levels.
A new gene drive technology, known as e-Drive, has been developed to reverse insecticide resistance in pests by replacing mutant genes with native ones. The system is designed to spread and then disappear, leaving only a population of insects susceptible to pesticides.
A nationwide coyote survey reveals that human hunting practices may increase, rather than reduce, local coyote numbers. Coyotes are found to be most abundant in grasslands and agricultural landscapes.
A recent study by CU Anschutz scientists found that an ancient gene mutation among First Nations inhabitants of Oceania may make them more susceptible to certain infectious diseases. The allele, KIR3DLI*114, is widespread and unique to Oceania, with up to 30% of individuals carrying it.
Scientists used acoustic mapping technique to track vulnerable capelin species and observe massive predation event involving Atlantic cod. The study revealed that as climate change causes Arctic ice sheet to retreat, capelin will be more stressed and vulnerable to natural predation events.
Research shows that animals, including humans, can become less sociable as they age to avoid diseases and parasites. This phenomenon, known as social ageing, may bring benefits, such as reduced competition and increased safety.
Researchers studied an isolated population of sparrows on Lundy Island and found that older birds tend to have fewer friends, similar to humans. The study suggests that there is no 'evolutionary pressure' to maintain social connections in older age, leading to a decline in friendships.
Researchers found that 57% of tested chemicals altered fruit fly larvae behavior significantly, even at non-lethal doses. Long-term survival was compromised in a dose-dependent manner, with a 60% drop in egg-laying rates observed among exposed mosquitoes and Painted Lady butterflies.
A research team, led by Francesco Ferretti, located signs of white sharks at four sites in the Sicilian Channel, a stronghold of the endangered species. The team used improved methods and technologies, including eDNA sampling and camera traps, to detect the presence of the sharks.
Researchers have successfully established new sacred fir forests on a nearby volcano to serve as overwintering sites for monarch butterflies, which are projected to disappear from their current habitats due to global warming.
In a 30-year experiment, scientists witnessed rapid evolution of marine snails in response to pollution and climate change. The snails' adaptation was driven by genetic diversity and gene flow from neighboring populations, allowing them to rapidly adapt to their new environment.
A recent study published in Nature Aging suggests that life expectancy gains are slowing down due to the detrimental effects of aging. The study found that life expectancy has increased only an average of six and a half years since 1990, contradicting some scientists' expectations.
In Dominica, Hurricane Maria killed most Purple-throated caribs, allowing other birds to pollinate heliconia plants. Researchers found that specialized pollination systems can become generalized after natural disturbances, showing resilience in ecosystems.
A study reveals that shrinking Japanese cities are often medium-sized or small, and that urban policies should be tailored to their specific needs. The research found correlations between population changes and social, economic, and urban-planning factors in cities of varying sizes.
Northern elephant seals nearly went extinct due to overhunting but have since recovered to around 225,000 individuals. The recent study found the species' genetic diversity was reduced during this period, which may impair their ability to cope with future environmental changes.
A new study using a mammal model suggests that fitness loss through spontaneous mutations will not significantly affect human populations. The research indicates that even without natural selection, the rate of fitness decline is not a cause for concern, providing reassurance about human viability in the near future.
A study highlights the importance of dedicated exits for vulnerable populations during building evacuations, with findings suggesting that centrally located dedicated exits can improve evacuation efficiency. Dedicated exits are most beneficial in low to moderate crowd densities and should be carefully considered in high-density scenarios.
A recent study published in PLOSONE reveals that young, bred corals from the Coral Seeding approach are more resistant to bleaching under extreme heat stress. This finding provides evidence that assisted coral recruits can play a crucial role in securing the future of coral reefs.
Underwater noise pollution from human activities significantly impacts the ability of orcas to hunt successfully in the Salish Sea. The study found that increased ambient noise levels, particularly around vessel propellers, interfere with echolocation behavior and hunting efforts. This hindrance affects females more than males, potenti...
A recent study found that actively managed habitats can slow or reverse population declines in at-risk butterflies. Habitat management, such as prescribed burns and planting nectar plants, appeared to dampen the effect of climate change on butterfly timing.
A study sequenced the genomes of nearly 300 rabbits to understand their colonization success. Researchers found that domestication-linked genes are often eliminated in feral populations due to natural selection, leading to a mix of domestic and wild origin. This helps explain how domestic animals can thrive in the wild.
Researchers used supercomputer simulations to study the evolution of social norms in subdivided communities. They found that these communities facilitate the emergence and stability of cooperative norms, which are essential for sustained cooperation.
A genomic analysis of last surviving woolly mammoths on Wrangel Island reveals signs of inbreeding and low genetic diversity, contradicting the idea that they were doomed to extinction. The research suggests that a random event likely led to their demise.