Articles tagged with Predators
Researchers found that competition for prey among carnivores wasn't a cause of megafaunal extinction. Instead, climate change and human arrival led to the demise of giant predators like saber-toothed cats. Today's apex predators in North America are smaller animals that took advantage of the extinction.
A new study found that elk in northern Yellowstone avoid both cougars and wolves by selecting specific habitats. The research highlights the importance of considering multiple predator species when studying prey populations and ecosystems.
A new study reveals that humans' presence creates a 'landscape of fear,' causing large carnivores to suppress their behavior and allowing rodents to forage more intensively. This shift has significant consequences for the entire food web, highlighting the need for ecologists to understand human-wildlife interactions.
A new Cornell University study reveals that releasing natural enemies to combat pests is more effective in fields surrounded by forests and natural areas, resulting in fewer pests, less plant damage, and increased crop biomass. Conversely, farms with predominantly agricultural landscapes saw the opposite outcome.
Research at Lund University reveals that prey animals with a weaker immune system have an increased risk of illness due to chronic stress from predator presence. The study found that bold individuals with a greater need for defense exhibit a better immune response.
A team of researchers found a peculiar tooth composition in great white sharks and their relatives, which is similar to that of the fossil shark Palaeocarcharias stromeri. The shared tooth histology indicates that this small shark gave rise to one of the most iconic shark lineages.
Researchers found that great crested grebes change their egg-laying schedule to coincide with neighboring birds' breeding cycles, utilizing protection services from species like black-headed gulls and black terns. This adaptation allows them to safeguard their nests from predators such as hooded crows.
Research finds that rodent mothers become more pregnant after smelling odors from scared males, indicating a nuanced risk assessment of their environment. This phenomenon showcases the power of olfactory 'eavesdropping' in animal communication.
A new study found that extreme drought conditions can lead to an explosion of root-feeding nematodes in grassland ecosystems, decreasing grass root production and potentially exacerbating carbon sequestration loss. The research team hopes to learn more about the interaction between water and nematode stresses to plants.
Researchers found that scorpions adapt their stingers and venom use to minimize costs, with strategies including avoiding venom, using claws or pedipalps, and adjusting sting volume and composition. Scorpions can also tailor venom to a target through on-the-fly adjustments and over weeks of exposure.
A new model developed by marine biologists has revealed that reef fish enter the 'danger zone' around invasive lionfish at similar rates to native predators. The study found that prey are up to twice as likely to be captured by lionfish than by native predators, highlighting the need for conservation efforts to protect vulnerable species.
A team of researchers, led by Princeton's Rob Pringle, studied the effects of invading predators on prey species in the Bahamas. The study found that when prey can respond rapidly to the presence of a predator, predators might reduce the ability of prey species to coexist.
Researchers found that the mere presence of Dikerogammarus villosus can reduce the effectiveness of its prey, causing them to expend more energy avoiding the predator. This phenomenon, known as a non-consumptive effect (NCE), has major localized effects on river ecosystems and may impact their recovery following perturbation.
A new study found that magpies are the most common predators of songbird nests, accounting for 70% of visits. Nests within magpie breeding territories were also more likely to be predated, especially in late season when magpies have young. The research highlights the need to identify and remove problem individuals to improve management...
Beetles infected with intestinal parasites exhibit reduced aggressive behavior during simulated attacks from predators and rival males. Larger beetles tend to fight back more than smaller ones, while parasitized beetles produce fewer squeaks as a defensive behavior.
Human screams exhibit a wide range of acoustic factors, including high pitch and roughness, which can vary in emotional context. The study's findings suggest that humans may use different-sounding screams in various situations, warranting further investigation into their interpretation.
Scientists discovered two instances of flightless rail species colonizing Aldabra island, evolving independently after tens of thousands of years. The study provides the first evidence of iterative evolution in rails, revealing how a single species from Madagascar gave rise to two distinct species on the island.
Researchers observed Herring Gulls developing a complicated behavior to 'skin' sea creatures, making them safe to eat. The birds grasp the sea squirt's tunic in their beaks, shake it to loosen the soft edible inner body, and then switch to hold and shake again until the inedible outer layer is removed.
Researchers discovered that deep-sea fish can see color in the dark by examining the genomes of 101 species. This ability may have evolved as a survival weapon to quickly detect predators or prey in low-light conditions.
Historical records show that lions are injured by porcupine quills when they attempt to hunt them. Young male lions are more likely to be injured or killed, and their injuries can impair their hunting abilities and even lead to man-eating.
A new scat study provides insights into the diets of Humboldt martens, revealing a diverse range of prey species including voles, birds, and berries. The research suggests that vegetation in coastal forests offers an ideal environment for these martens, with less competition from predators.
The annual Winter Study report chronicles the effects of wolf reintroductions on the island's ecosystem, with 13 new wolves and 20 radio-collared moose providing valuable data. Researchers expect a slowing down of moose population growth due to severe vegetation damage, while wolf pups may be possible this year.
Research by the University of Saskatchewan found that fish release 'disturbance cues' to signal nearby dangers like predators. This voluntary chemical release can trigger a 'fright response' in fish, promoting defensive behavior.
A new study by Penn State researchers finds that male fence lizards' physical traits and behaviors used to attract mates remain unchanged under low levels of stress. This suggests that these traits are more resilient to stress than previously thought.
Research reveals that white sharks immediately vacate their preferred hunting grounds when orcas arrive, resulting in no shark sightings for up to a year. Elephant seal colonies also indirectly benefit from these interactions, with significantly reduced predation events during the orca presence period.
A new study found that leaders in groups of animals are more vulnerable to attack from predators due to their riskier position within the group. Researchers used virtual prey in aquarium tanks and found leaders were more likely to be attacked than followers, with isolated individuals also being at higher risk.
Researchers found that being part of a group provides safer protection from predators, with prey positioned in the middle of schools having the safest position. The study revealed that predators are more likely to attack isolated individuals than those in groups, highlighting the benefits of collective behavior.
Aphid soldiers expel lipid-rich fluids to create a soft clot around the gall wound, which is swiftly hardened and melanin-darkened through phenoloxidase. This collective action amplifies an immune response for social defense, providing molecular clues to altruistic social defense mechanisms.
Researchers at the University of Saskatchewan found that even tiny amounts of neonicotinoid pesticides can severely impact flying insects' motion detection abilities. The study's results suggest that very low doses of these widely-used neurotoxins can profoundly affect a flying insect's ability to detect movement, making it crucial for...
Researchers question the predictability of ecosystem changes when apex predators are reintroduced, citing climate change and invasive species as complicating factors. The study's findings have big implications for wildlife conservation in places like Yellowstone National Park.
Research reveals marine reserves increase predation rates, protecting predators that were heavily fished by humans, leading to greater impacts on prey species. The analysis highlights the importance of considering ecological processes in reserve design and management.
Researchers have captured high-speed videos of kangaroo rats defending themselves against rattlesnake attacks, showcasing their record-breaking reaction times and evasive maneuvers. The data suggest that the kangaroo rats' powerful legs and mid-air kicks allow them to avoid being envenomated.
Elk exhibit minimal avoidance of wolves due to philopatry, returning to familiar foraging areas despite small risk of predation. The study's findings suggest that wolves have negligible impacts on elk movements, contradicting previous theories.
A new study of eastern US deer numbers found that coyote predators did not significantly affect deer population sizes. Despite coyotes preying on vulnerable individuals, predation on healthy adults is uncommon and may not impact deer populations at large scales.
A new SDSU study reveals that California sheephead and spiny lobsters play a crucial role in controlling sea urchin populations in Southern California kelp forests. The research provides valuable insights into the complex predator-prey relationships in these ecosystems, which are essential for maintaining the health of kelp forests.
Mowing grasslands in June or July can increase monarch butterfly egg laying by 3-10 times, while also reducing predators. This strategy aims to provide a food source for the butterflies' larval stage and create a more favorable environment for their survival.
Researchers at the University of Wisconsin Oshkosh found evidence that a juvenile T. rex fed on a plant-eating Edmontosaurus dinosaur, despite lacking adult bone-crushing abilities. The discovery provides insight into how T. rex developed changes in diet and feeding habits as it grew.
Researchers observed coyote families at a Utah facility during breeding seasons and found that parental influence plays a major role in shaping their behavior. Coyotes become bolder when parents are more fearless, and this trait is passed on to their offspring, which can lead to negative interactions with humans.
A new study on Mozambique's Gorongosa National Park shows that the loss of top carnivores can have far-reaching consequences for prey and plant populations, turning 'landscapes of fear' into 'landscapes of fearlessness'. However, carnivore restoration in these areas could help reverse any ill effects of human activity.
Researchers discovered that the removal of large carnivores like leopards and hyenas led to an expansion of antelope species into open plains. Reintroducing these predators reversed this effect, causing antelopes to retreat to wooded areas, while plants flourished in their absence.
A new study found little evidence of elk modifying their behavior to avoid grey wolves in Yellowstone National Park, contradicting earlier research on the topic. The study used GPS tracking technology to monitor elk and wolf movements between 2012 and 2016.
A University of Michigan-led team of biologists has documented 15 rare and disturbing predator-prey interactions in the Amazon rainforest, including images of tarantulas dragging opossums across the forest floor. The study highlights the importance of arthropods like spiders as a source of vertebrate mortality in tropical ecosystems.
Researchers at the University of Cincinnati found that adult jumping spiders mimic two species of ants to deceive predators, but retain their spiderly figures to woo potential mates. The spiders' detailed mimicry involves waving forelegs like antennae and performing weaving behavior, but they have lost the ability to jump.
Research found that mule deer shift to higher, steeper elevations away from roads and toward brushy terrain when faced with wolves. White-tailed deer stick to normal behavior, sprinting across open terrain with good visibility. The changes may affect hunting opportunities and ecosystem dynamics.
Researchers from the University of Exeter found that lion killing by Maasai farmers increases when lions are identified as culprits of livestock death. This study challenges the common belief that lion killing is a retributive act caused by general loss of livestock.
New research finds humans struggle to accurately classify snail shells due to differences in colour perception. A study using spectrometry reveals distinct clusters for brown, pink, and yellow snails, providing a baseline measure for future studies on animal colour and genetics.
In a study published in Communications Biology, viceroy butterflies living in northern Florida have evolved to produce a foul-tasting chemical, making them unpalatable to predators. This discovery challenges traditional mimicry theories and suggests a continuum between Batesian and Mullerian mimicry.
Researchers developed a framework to detect species interactions using camera trap data, highlighting the need for standardized data collection and collaboration. The study found that many records are needed to produce trustworthy results, but standardization can achieve this by combining datasets from multiple studies.
A newly discovered tyrannosaur, Moros intrepidus, has narrowed a 70-million-year gap in the North American fossil record. The species, which lived about 96 million years ago, was small but exceptionally fast and had advanced sensory capabilities.
A study published in Nature Climate Change finds that climate change can redistribute the strength of ecological interactions between predator and prey species. Higher temperatures lead to more intense predation pressure, while increased climate instability weakens predators' effectiveness in controlling pests.
Zebras evolved striped coats to evade tabanid horse flies, which carry debilitating diseases. The study found that stripes don't deter flies at a distance, but disrupt their approach, making it harder for them to land and feed on zebras.
A new study published in PLOS One found that zebra stripes deter horse flies from landing on them by reducing the likelihood of a successful bite. The striped coat prevented flies from slowing down and failing to land, leading to fewer bites.
Researchers discovered that some Australian sea snakes can sense light on their tail skin, prompting them to withdraw their tails under shelter. This unique ability, found in only six species of sea snakes, helps protect their vulnerable paddle-shaped tails from predators.
A new study has documented the unexpected consequences of great white shark decline on an ocean ecosystem. Sevengill sharks, a top predator with unique characteristics, have emerged as a result of great whites' disappearance. The researchers observed sevengill shark sightings increasing in number after great whites vanished from surveys.
Spotted lanternflies modify their diet and coloration to become distasteful and signal this to predators. The insects accumulate specific chemicals from tree juices, making them toxic to birds, which learn to avoid them based on their bright colors.
A study by Oregon State University found that extreme draining of Fall Creek Reservoir helps juvenile spring chinook salmon migrate downstream, but also changes the aquatic food web and releases potential predators. The effects on the entire river system are uncertain, but the impacts for juvenile salmon are twofold.
A genus of deaf moth has evolved a novel sound-producing structure in its wings to warn bats of its presence. The discovery suggests that the moths are acoustically mimicking unpalatable, sound-producing moths to deter bats.
The ancient archosaur Smok wawelski exhibited bone-crushing behavior, consuming prey bones for their salt and marrow content. Researchers linked coprolites to the species through synchrotron microtomography and found crushed teeth and bite-marked bones.
A study by University of Delaware researchers reveals that larger-bodied fish, like juveniles, associate with anemones for protection, while smaller species partner with them throughout their lives. This mutualistic relationship is driven by predation and helps fish avoid predators in ocean reefs.
A new study reveals that polar marine predators have a metabolic advantage in cold temperatures, allowing them to thrive with greater species richness at the poles than in the tropics. This challenges the typical latitudinal gradient of increasing diversity towards the equator.