Articles tagged with Predators
Historians detail a burst of fishing from 1900 to 1950 that preceded the decline of bluefin tuna populations in the North Atlantic. The research suggests high fishing pressure played a key role in the species' disappearance.
A new study published in Biological Conservation shows that wolves are allowing aspen trees to recover in Yellowstone National Park for the first time in over 50 years. The presence of wolves is altering elk behavior, causing them to avoid browsing in certain areas where they feel vulnerable, leading to a significant reduction in elk b...
Research reveals that butterfly mimicry benefits both species involved, as predators avoid eating the most unpalatable species but still learn to distinguish between them. The study provides insight into how insects evolve to resemble one another and change their behavior.
Researchers from IRD and IMARPE found that fishermen adopt similar movement strategies to natural predators when searching for anchovy fish, highlighting the importance of an ecosystem-based approach to fisheries management. This study used VMS data to analyze vessel movements and identify areas with high vulnerability of stock exploited.
Researchers discovered Alaska's ancient wolves were distinct from modern wolves, with robust bodies and massive canine teeth. The study suggests these specialized hunters and scavengers thrived in ancient Alaska, but their extinction portends potential demise of similar predators due to global warming.
A study by Dr. Joel Berger found that prey animals like moose and elk only fear predators they regularly encounter. The research demonstrated that the loss of wolves led to a decrease in vigilance and fear responses in these species.
Researchers found that Phaeocystis globosa can change its colony formation based on the presence of nearby grazers, enhancing or suppressing colonies to avoid being eaten. This complex defensive behavior has implications for global climate change, as Phaeocystis blooms play a key role in the carbon cycle.
Researchers found that female side-blotched lizards induce different color patterns in their offspring based on social cues, which helps ensure survival. The mother's influence determines whether her progeny have stripes or bars on their backs, adapting to the environment they will encounter as adults.
Researchers found that fishermen's movement patterns are comparable to those of natural predators, such as albatross or seals. This convergence suggests that fishermen are not solely economic agents but part of the ecosystem, influencing fish stock management and requiring an ecosystem-based approach to fisheries management.
In a study of fiddler crabs, researchers found that females prefer males with hood-like sand castles as these signals help them avoid predators while sequentially visiting and assessing potential mates. This new understanding highlights how the ecology of choosing a mate can shape sexual communication.
A new census confirms the Amur leopard's precarious survival, with fewer than 35 individuals remaining in the wild. The species is threatened by encroaching civilization, poaching, and climate change, highlighting the need for expanded protected areas and conservation efforts.
Researchers at the University of New Hampshire are setting the winter flounder fishery on the fast track to recovery through stock enhancement. The study found that hatchery-raised fish must be as fit as wild fish to ensure success, and acclimatization cages can help reduce vulnerability to predators.
Researchers found that fish in schools escape using a relatively fixed chronological order, indicating a potential leadership structure. This study was conducted at the International Marine Centre in Sardinia, Italy, and will be presented at the Annual Meeting of the Society for Experimental Biology.
Research by Jorgen Johnsson and Fredrik Sundström found that naive fish benefited from the skills of pre-trained group mates despite having outdated knowledge on predation risk. Social learning improved foraging success, suggesting it can be a beneficial strategy even in uncertain environments.
Researchers found that moths can detect and respond to bat calls, even when others cannot. The yellow underwing moth's ear adjusts its sensitivity in response to changing sound frequencies, allowing it to stay 'tuned' for up to several minutes after the call stops.
Male crickets sing less and for longer in autumn due to parasitic fly presence, while females are reluctant to approach singing males. This finding sheds light on the interplay between sexual selection and natural selection.
Researchers discovered that groupers and giant moray eels work together to hunt prey, sharing roles and coordinating behavior. This mutually beneficial arrangement highlights the complexity of fish social interaction and challenges our understanding of animal intelligence.
Dunkleosteus terrelli, a 400-million-year-old fish, had the strongest bite of any fish with a force of 1,100 pounds, rivaling that of large alligators and Tyrannosaurus rex. Its unique bladed dentition focused the bite force into a small area, while its ability to open its mouth quickly created a strong suction force.
Researchers found that island lizards' hind legs shifted from longer to shorter limbs in just six months, favoring survival in a new predatory environment. This rapid evolution highlights the importance of behavioral flexibility in driving evolutionary changes.
A new theory suggests that phenotypic plasticity acts as a barrier to invasion unless invaders are given a huge competitive advantage. Invasions often alter ecological relationships, requiring species to modify traits to survive.
A new study reveals that traditional ranchers are being priced out of business as wealthy 'amenity' owners buy up large ranches around Yellowstone National Park. These new owners often prioritize restoration of native ecosystems, large-scale conservation projects, and innovative approaches to blending conventional ranching with non-let...
A new study by Oregon State University researchers found that cougar predation has a significant impact on the environment, leading to severe ecological damage and loss of biodiversity in Zion National Park. The 'trophic cascade' effect, where the decline of a major predator leads to changes in herbivore populations and behavior, is ev...
An interdisciplinary team will investigate how environmental changes influence an organism's evolution and how the evolving organism affects the ecosystem. The study, led by UC Riverside's David Reznick, aims to understand eco-evolutionary feedback loops in guppy populations coexisting with Hart's killifish.
Researchers have found that trap-jaw ants can propel themselves through the air using their fast-moving jaws, with two types of defensive propulsion mechanisms discovered. The ants use these mechanisms to escape predators and eject intruders, with bouncer defense allowing them to bounce away from large objects.
Researchers at the University of New Hampshire found that blue mussels can recognize and respond to two invasive crab species within 15 years. In southern New England, mussels thickened their shells in response to Hemigrapsus sanguineus, while northern populations showed a delayed response.
Researchers at University of Wisconsin-Madison suggest a double whammy of intensive trapping and predator fish manipulation may rid lakes of the invasive species, restoring ecosystem balance. The two-pronged attack has shown promising results in reducing rusty crayfish populations on Sparkling Lake.
Scientists suggest that primates evolved good close-up eyesight to avoid snakes, which were the primary predators of modern mammals. Fossil records show that snakes emerged around 100 million years ago, prompting primates to adapt their vision.
Male guppies with rare color patterns have a highly significant survival advantage in the wild, surviving at 84% rate compared to 69% for common-patterned males. This phenomenon is linked to frequency-dependent survival, where rarity confers an advantage over common variants.
A study finds that US sheep industry decline is linked to market trends, not predation losses, contradicting decades of federally subsidized predator control efforts. The study's findings suggest re-evaluation of federal funding for predator control in the sheep industry.
Researchers found that harmless frogs can look like less toxic species without losing protection from predators through stimulus generalization. This discovery challenges traditional mimicry theory and reveals a new mechanism involved in mimicry processes.
In a study at Ngamba Island Chimpanzee Sanctuary in Uganda, chimpanzees were found to understand when they needed help and chose the best collaborative partner. They recognized individual strengths and weaknesses among chimps, such as Mawa's poor cooperation skills, and consistently selected Bwambale as their preferred partner.
Researchers have developed various methods to minimize predation conflicts, including fladry with electrically charged wires and paintball-type devices. However, it's essential to consider the complex psychological relationship between humans and predators when implementing these strategies.
A study in a Venezuelan reservoir found that predator-free islands had significantly fewer plant species and smaller sapling densities than larger land masses. The researchers concluded that the presence of predators is essential for maintaining biodiversity and preventing ecosystem collapse.
Primates, including early humans, evolved to avoid predators, not hunt them. This theory suggests that intelligence and social skills developed as a result of outsmarting predators, leading to modern human traits like cooperation and socialization.
Despite losing some predators, anti-predator behavior can persist due to co-adapted suites with multiple predators. Studies of wallabies show that retention of anti-predator behavior is possible even after isolation from all predators.
Researchers found that introduced foxes reduced guano deposits, affecting plants and animals at the bottom of the food web. The study showed significant differences in plant communities between fox-infested and fox-free islands.
A study in Science journal reveals that marine reserves can support the growth of parrotfish populations, maintaining reef ecosystems. The Nassau Grouper's impact on the reef is minimal due to the size limit for predation, enabling healthy coral reef recovery.
Aplysia sea slugs use a system to mix and release chemicals, including L-lysine, L-arginine, and an enzyme protein called escapin, to defend against predators. The secretion stimulates feeding behaviors in some animals but deters it in others, and may also have antimicrobial properties.
Research by Dr. Mark Boyce found that removing one egg from a whooping crane nest increases the probability of nest success, leading to an increase in population numbers and establishment of new populations. The program has been successful in enhancing the conservation of the species, with over 200 birds currently thriving.
A new species of ancient crocodile, Dakosaurus andiniensis, has been discovered in Patagonia, South America. The massive creature had a T. rex-like snout and jaws powerful enough to catch large sea creatures.
Michal Kowalewski, a Virginia Tech geobiologist, has won the Schuchert Award for his groundbreaking research on ancient predators and their ecosystems. His work reveals that predators' struggle to survive may be due to menu selection errors over 500 million years ago.
Researchers found that sea lilies move by shedding stalk ends and using feathery arms to crawl. This defense strategy helps them evade sea urchins, which prey on them. The discovery sheds light on the evolution and ecology of deep-sea creatures.
Researchers have calculated the math behind nearly weightless water walkers' ability to scale water walls several times their height. Tiny obstacles, such as leaves on streams or stones on riverbanks, pose an invisible challenge to these creatures.
The study found that wolf exclusion led to a 10-fold increase in elk populations, resulting in decreased beaver lodge construction and disappearance of songbirds dependent on willow habitat. The findings support the role of large predators in conservation and restoration strategies.
Researchers have developed artificial sensory hair systems inspired by crickets' cerci, which can detect low-frequency sound with high sensitivity and directivity. The artificial hairs are energy-efficient and show potential applications in various fields such as sensor networks and aerodynamics.
A study of fossilized brachiopod shells reveals that predators were a constant threat throughout the Paleozoic Era, with subtle increases in predation traces suggesting escalating predation pressures. The findings suggest that marine ecosystems have become increasingly hostile to survival, consistent with macroevolutionary models.
Researchers found attacks on brachiopods were rare but widespread during the Paleozoic Era, with predators likely mistaking them for other prey. The findings hint at how the food chain changed over time as predators diversified and prey groups became better armored.
A recent study found that male fish with larger gonopodia are more attractive to females for mating purposes, but simultaneously exhibit reduced swimming performance when trying to evade predators. The research suggests a trade-off between genetic size and predator escape value in certain fish species.
Gray wolves help regulate elk populations, providing a steady food source for scavengers like bears and eagles during severe winters. The study highlights the importance of wolves in mitigating the effects of climate change on ecosystems.
Researchers discovered that vampire bats can run, unlike most bat species, and power their gait with their forelimbs. This unique ability may have evolved independently to aid in feeding behavior, allowing them to avoid predators and catch prey while sleeping.
A new study from PLOS Biology shows that reintroduced gray wolves in Yellowstone Park provide a crucial safety net for scavengers during climate change. Wolf kills temper the devastating effects of climate-related carrion shortages on scavengers.
Research from University of Bristol provides strongest evidence that disruptive patterns protect insects from birds, a predator that shaped evolution of protective coloration. By varying colors, size, and location of patterns on artificial moths, the team identified effective combinations that mimicked tree characteristics.
Researchers discovered that gliding ants, like Cephalotes atratus, can land on tree trunks and climb back up, with 85% success rate. The ants' ability to change direction mid-air is still a mystery, but it's likely due to their unique morphology, including flattened hind legs and head flanges.
A new study published in the Royal Society journal found that managing GM herbicide tolerant sugar beet crops can increase yields while reducing herbicide use. The research also shows that single glyphosate applications can enhance weed seed production, benefiting wildlife.
Researchers found that warming swordfishes' eyes allows them to process visual information faster than cooled eyes, giving them a significant edge over prey. By heating their eyes, swordfishes retain the ability to spot quickly moving objects, enabling successful hunts in cold water.
Researchers explore links between chronic stress in birds, depleted medieval fish stocks, and the costs of extended lifespan. Studies reveal how food and predators impact physiology and demography in songbirds and propose a norm for inseparable effects on both.
Researchers studied social implications of winner and loser effects in green swordtail fish, nocturnal colour vision in geckos, and bird distress calls. They also examined queen and worker policing in wasps and developed a model to minimize the impact of exotic infections.
Scientists have discovered a new species of sea reptile, Dinocephalosaurus orientalis, from the Guanling Formation in southeast China. The creature had a long-necked body, measuring over five feet, with relatively stiff neck and short limbs, suggesting it was adapted for life in the water.
Researchers discovered a significant increase in arm regeneration frequency among fossil crinoids during the Middle Paleozoic Marine Revolution, coinciding with the diversification of predators and prey adaptations. The findings suggest that broken arms may be collateral damage, rather than direct targets of predation.
Researchers developed a mathematical model that accurately reproduces gypsy moth population outbreaks, combining host-pathogen and predator dynamics. The model resolves the irregular timing of outbreaks and accounts for spatial synchrony, paving the way for applications to other forest insects and small mammals.