Articles tagged with Predators
A study on trembling aspen found that phenolic glycosides and extrafloral nectaries are distributed together in the same leaves, contradicting previous assumptions. The presence of extrafloral nectaries is positively correlated with higher levels of chemical defenses, suggesting a complex relationship between these defense mechanisms.
Cristina Eisenberg's new book highlights the importance of top predators in maintaining healthy ecosystems. Research shows that keystone predators like wolves, cougars, and bears play a critical role in controlling population growth and preventing overgrazing.
Scientists from Oregon State University are trying to address a looming crisis caused by the lionfish invasion in the Caribbean Sea. The invasive species is eating its way through entire ecosystems, reducing small fish populations by up to 79 percent and disrupting delicate ecological balances.
Researchers successfully trained northern quolls to associate the taste of toxic cane toads with nausea, allowing them to survive up to five times longer in areas infested with these invasives. This approach could provide a vital new weapon in the fight against invasive species.
A University of Illinois legal expert warns that court privacy rulings could have a chilling effect on mainstream journalists, restricting disclosures of scandals and corruption. She proposes a standard holding journalists liable only when their peers widely agree that coverage has crossed the line.
A new study reveals that birds, bats, and lizards play a crucial role in maintaining forest health by controlling insect populations. By eating herbivores and their insect predators, these animals reduce plant damage by 40%, leading to a 14% increase in plant biomass.
New Cornell University research reveals how plants at the bottom of the food chain have evolved mechanisms that influence ecosystem dynamics. Plants have developed three main strategies to increase their biomass, including producing volatile compounds called sesquiterpenes that attract predators, which drive modern ecosystems' structure.
Researchers found that sea urchins prey on crinoids, a type of marine animal known as sea lilies, and suggested that these interactions drove the development of motility in sea lilies. The study, published in PNAS, provides evidence for an evolutionary arms race between predators and prey dating back over 200 million years.
A previously unknown predatory thrips species, Karnyothrips flavipes, has been identified as a predator of the coffee berry borer, Hypothenemus hampei. This discovery could have significant implications for integrated pest management in coffee-producing countries.
Researchers found that nutrient enrichment caused a steady increase in organisms lower on the food chain but had no effect on predators like salamanders and macroinvertebrates. The study suggests that maintaining patterns of energy flow between predators and prey is critical for healthy ecosystems.
Researchers at UC Davis studied birds' alarm calls to determine their purpose. The findings suggest that these vocalizations serve both to alert other birds to danger and to warn off predators.
A rare woodland plant, Monotropsis odorata, has evolved 'cryptic coloration' as a defense mechanism to avoid herbivores. The plant's bracts function as camouflage, making it blend in with its surroundings, which increases its fitness and survival rate.
Researchers found that skunks' distinctive black-and-white coloration is not enough to deter predators, but rather it's the combination of color and body shape. In areas where skunks are common, predators avoid animals with similar shapes or colors, highlighting a stronger learning component in prey recognition.
A new study led by Dan MacNulty found that wolves' predatory ability peaks when they are two to three years old, not throughout their entire adult lives. The study suggests that physiology limits predation and that older wolves rely on athletic ability, which diminishes with age.
A new study finds that the decline of apex predators has led to a significant increase in mesopredator populations, resulting in ecosystem collapse and economic losses. The study highlights the complex interactions between humans and wildlife, emphasizing the need for careful consideration of solutions to manage these issues.
Researchers at McMaster University found that corpses of animals emit the same death stench, produced by specific fatty acids, which repels living relatives of insects. This ancient warning signal may have evolved to avoid disease and predators, with potential applications in pest control and immunity activation.
A new study reveals that oil development in the Arctic is attracting opportunistic predators like Arctic foxes, ravens, and gulls, which feed on nesting birds. These predators are using oil infrastructure to build nests or dens, leading to a significant loss of nests in areas closer to oil development.
Researchers find that field mice base their diet on holm oak and pine seeds, leading to habitat deterioration and the expansion of scrubland. The study reveals a consistent pattern of seed predation by rodents across different habitats.
Theropod dinosaurs likely targeted young and small dinosaur species as a primary food source, exploiting their softer bones. This hypothesis is supported by fossil finds and stomach contents, suggesting that giant carnivores mainly fed on juvenile animals, not large herbivorous dinosaurs.
Researchers discovered that Yellow-lipped Sea Kraits deceive predators by twisting their tails to resemble a second head, complete with venom. This false-head behaviour is an overlooked anti-predator adaptation that helps sea snakes survive in the ocean.
Perennial crops offer a solution to unsustainable agricultural systems by producing more, requiring less input, and maintaining soil health. Increasing landscape diversity can also boost populations of pests' natural enemies, reducing the need for pesticides.
A study reveals that the lesser short-tailed bat's walking ability evolved in an ancient Australian lineage, contradicting previous assumptions. The bat's unique adaptations, such as adhesive grooves and extra talons, have advantages only in specific circumstances, not due to competition from other mammals.
The discovery of Suminia getmanovi, a small plant-eating synapsid, provides evidence that vertebrates took to trees early in Earth's evolution. The tree-climbing lifestyle offers access to new food resources and protection from ground-dwelling predators.
Scientists have developed computer models explaining polymorphism in animal populations, where individuals can display multiple distinct forms. The research suggests that a modest level of predator dietary wariness is sufficient to maintain large numbers of prey forms within a single species.
Researchers at Yale University found that predator-prey interactions play a crucial role in creating spatial synchronicity among living organisms. The study showed that changes in these interactions can have disastrous consequences for ecosystems.
Researchers propose a Scottish Highland test case to reintroduce wolves and study their impact on red deer behavior and ecosystems. The goal is to restore landscapes of fear, controlling overgrazing and promoting biodiversity.
A study published by Montana State University researchers found that elk are having fewer calves due to changes in their nutrition, mainly caused by the presence of wolves. Elk are changing their behavior and foraging habits, such as browsing more in forested areas, resulting in a 27% decrease in food intake.
Researchers have identified the largest carnivorous dinosaur tooth in Spain, measuring 9.83cm, and attributed it to the Allosauroidea clade. The tooth's features provide key information about its former owner, a large predatory theropod that likely belonged to the same group as Turiasaurus riodevensis.
Scientists tracked white shark hunting patterns using geographic profiling, revealing that sharks refine search patterns with experience and concentrate efforts in prime hunting areas. The study expands knowledge of large predator hunting behavior and has implications for understanding marine communities.
A water snake from South East Asia has developed an unusual hunting technique that startles fish into fleeing towards its head. The snake uses sound waves to trigger the fish's 'C-start' response, driving them to swim directly into its jaws.
A study on guppies led by UC Riverside's Swanne Gordon found that the fish adapted to a new environment in less than 30 generations, or eight years. The guppies developed larger and fewer offspring with each reproductive cycle in the low-predation environment, but not in the high-predation environment.
A tiny fly, the midge Corethrella appendiculata, eats more of the invasive Asian tiger mosquito larvae than native Eastern treehole mosquito larvae. This allows native mosquitoes to survive despite being outcompeted by the invasive species.
A study published in the Proceedings of the National Academy of Sciences has found that snail shells in the Atlantic Ocean have increased in size due to changes in local conditions, such as wave exposure and invasive species
Researchers found that seagulls watch and mimic their neighbors' behavior during rest periods, indicating a life-saving trend. This study suggests animals don't act independently but cue on reactions from other members of their group.
Rafe Sagarin, a Duke University ecologist, advocates for a Darwinian approach to homeland defense, emphasizing adaptability and responsiveness over rigid security measures. By learning to live with threats rather than eliminating them entirely, organisms can better handle unforeseen risks in an escalating arms race.
Climate change is causing Antarctic sea life to face an invasion of predatory king crabs and exotic species, potentially devastating the region's unique ecosystem. Rising temperatures are allowing these species to expand their habitats, disrupting delicate ecological relationships and putting the world's last truly wild places at risk.
A new study reveals human predation is accelerating trait changes in commercially harvested species, with 20% smaller body sizes and 25% earlier first reproduction compared to previous generations. This process has been observed at a rate 300% above natural systems and 50% faster than other human influences.
Butterflies use their hind wings to make quick turns and evade predators, according to a study published in the Proceedings of the National Academy of Sciences. The study found that removing hind wings reduces turning acceleration in half, making it harder for predators to catch them.
Dinosaurs had more air cavities in their heads than expected, which may have helped lighten the load of their heads and enabled them to move their heads quickly. These sinus cavities also played a biomechanical role by making bones hollow, similar to hollow beams used in construction.
Researchers discovered that butterfly species with similar wing patterns have evolved to live in the same territory, maximizing benefits of their appearance. This adaptation highlights the role of protection from predators in evolution beyond pure competition.
Researchers found that cockroaches choose between four primary escape routes at fixed angles from threats, avoiding predictability and allowing them to stay one step ahead of predators. This study challenges the idea that 'unpredictable' behavior is random, suggesting instead that animals may be choosing between multiple strategies.
A Brown scientist found that quahog clams increase in number in hypoxic zones, as they can withstand oxygen-depleted waters and their predators cannot survive there. This suggests that certain species may benefit from dead zones, contradicting the conventional wisdom on these areas.
Bald eagles adjust their foraging tactics in response to the decline of Alaskan sea otters. Sea otters play a crucial role in maintaining kelp forest ecosystems, which provide food and habitat for many fish and invertebrates. As otter populations decrease, bald eagles shift their diet from kelp-forest fish to birds.
Patrick Crowley, a computer architect, is designing a new network for the US Department of Defense to facilitate real-time information sharing. The goal is to enable commanders to understand the location and status of all platforms, equipment, and personnel in real-time.
A new species of Bagworm Moth with predatory larvae has been discovered in Panama's tropical forest. The larvae construct portable structures called 'bags' to capture prey, including spiders and insects.
Researchers found milkweed plants have declined in three key defense traits against caterpillars, such as hairs, cardenolides and latex, but increased ability to regrow. This evolutionary trend may be an energy-efficient response to counter caterpillar attacks.
A new study found that lionfish can slash the survival of other reef fishes by 80 percent within a short period. The invasive species disrupts the ecological balance of coral reefs, allowing seaweeds to overwhelm them. This is another major threat to coral reefs, following overfishing and pollution.
A team of scientists found that blackcap birds can distinguish between genuine and fake cuckoo eggs by altering the UV reflectivity. The study, published in The Journal of Experimental Biology, shows that when blackcap eggs are coated with a UV blocker or Vaseline, they are rejected by the parents.
Researchers found that bold birds, who sing from exposed sites, are more likely to be explorers and risk-takers in the wild. These individuals have a higher mating success due to their attractiveness to females.
Research at Queen's University reveals that migrating songbirds observe and learn from local birds' 'mob' behavior to avoid predators. By recognizing social cues, they can gain valuable information about predator location and identity.
Researchers found that New Zealand birds can change their nesting behavior in response to introduced predators, reducing the risk of predation. This adaptation allows island birds to survive even in areas with high levels of predator activity, providing new insights for conservation efforts.
Researchers at the University of Bristol demonstrate that birds respond to subtle signals from humans, including eye-gaze direction, to avoid predators. This ability allows starlings to gain valuable feeding time before others join a competitive foraging patch.
Researchers at MU identified communication tactics used by child sexual predators, including deceptive trust development and grooming strategies. These tactics aim to build a trusting relationship and isolate victims from their support network, ultimately leading to physical contact or abuse.
Researchers created a living system using genetically altered bacteria to study the dynamics of interacting populations. The system, which consists of two distinct populations of bacteria that control each other's survival rates, provides a unique model for exploring population changes in a predictable manner.
A new international study reveals how the Komodo dragon can efficiently kill prey despite having a weak bite and featherweight skull. The 'space-frame' skull, combined with powerful neck muscles and razor-sharp teeth, allows it to butcher large animal prey.
Researchers at the Smithsonian Tropical Research Institute found that bats are more effective pest control agents than birds in a lowland tropical rainforest. In the study, plants lost 13.3% of their leaf area when only bats were excluded, compared to 7.2% with only birds excluded.
Larval sand dollars use cloning as a survival mechanism to reduce size and visibility to predators when threatened. By creating clones, they increase chances of survival by having multiple individuals, but this may come at the cost of reduced size later in life.
A new study reveals that some snakes have evolved super-resistance to the toxic newt's poison, rendering it ineffective. This rare exception highlights a previously unknown aspect of co-evolutionary arms races and challenges our understanding of species interactions.
A Yale study finds that predators, rather than plants, determine the type and abundance of herbivores and carnivores in an ecosystem. The research shows how spider hunting modes affect grasshopper behavior, promoting habitat diversity but also depleting nitrogen in the soil.
A new study reveals that well-meaning efforts to protect cougars in Washington State have actually increased dangers for the species. Biologists are now scrambling to find a science-based path to coexistence between people and predators.