Articles tagged with Predators
A nearly 1.5-kilometer-long trackway of early-human footprints has been discovered at White Sands National Park, showing a woman or adolescent male carrying a toddler in their arms. The tracks, dating back over 11,500 years, suggest a perilous journey through mud and animal habitats.
A RUDN University mathematician has enhanced the standard predator-prey model to include nonlocal interactions, which affect system dynamics and lead to different patterns of predation and prey growth. This improved model will help ecologists better understand natural systems and predict their development.
A study found that carnivores near people consume over half of their diets from human food sources, disrupting ecosystems. This reliance increases competition among predators, potentially leading to conflicts and detrimental ecological consequences.
Researchers found that the formation of the Isthmus of Panama led to a significant reduction in native South American mammal diversity, allowing North American immigrants to thrive. The resulting asymmetry has lasting effects on modern species distribution.
Researchers modelled the changing ecologies of fossil reptiles in Mesozoic oceans, discovering six ecological categories that linked movement, habitat, and feeding styles. The study shows that these marine reptiles avoided competition with each other, with some groups conserving their ecological roles over time.
Research on ancestral wolf species reveals evidence of food-sharing and family care, as evidenced by healed injuries. Fossil specimens from China and California show similar dental infections and leg fractures to modern wolves.
Researchers have identified a unique enzyme used by predatory bacteria to rupture the cell wall of its prey bacteria and exit without damaging its own cell wall. The discovery of this novel lysozyme holds promise for developing new therapies against antibiotic-resistant pathogens.
Researchers found that drought and flood conditions in bromeliad microcosms affected the functioning of aquatic ecosystems, particularly at the bottom of the food chain. The study showed that smaller organisms suffer more from rainfall instability than larger ones.
Researchers at the University of Queensland discovered that male funnel web spider venom is deadlier than female venom due to evolutionary adaptations. The study, published in PNAS, sheds light on the unique properties of delta-hexatoxins and their fatal neurotoxic effects on humans.
Researchers identified 22 additional δ-hexatoxins from 10 Australian funnel web spider species, suggesting the venom plays a defensive role. The toxins' high human toxicity may have emerged as a result of their original function against nonhuman vertebrate predators.
A team of researchers from the University of Portsmouth discovered over 1,200 dinosaur teeth that confirm Spinosaurus was a river-monster. The findings support the theory that dinosaurs were adapted to an aquatic lifestyle, with Spinosaurus being the most commonly found creature in the Kem Kem river system.
Researchers found climate change impacts parasitoid wasps and flies, altering ratios between warm- and cold-adapted species. This study provides insights into how global warming affects ecosystems, increasing understanding of ecology and potential solutions.
New research reveals that climate change is exacerbating the decline of sea otters, which in turn are destroying Alaskan kelp forests. The loss of sea otters is allowing sea urchins to overgraze the coralline algae that form the reefs.
A 40-year study reveals that the rise of sticklebacks, a key predator of algae, is driven by reduced numbers of larger fish species. This shift from predator-dominated to algae-dominated ecosystems has significant implications for ecosystem restoration and management.
The discovery of a fossilized ichthyosaur with a smaller marine reptile in its stomach provides direct evidence of megapredation during the Triassic period. The prey was likely a thalattosaur, a group of marine reptiles that were more lizard-like in appearance than ichthyosaurs.
A new study confirms Deinosuchus had the head size and jaw strength to prey on dinosaurs. The massive creature lived in North America during the late Cretaceous period, up to 33 feet in length, making it one of the largest crocodylian genera ever in existence.
Pygmy owls' ability to overwinter is threatened by climate-driven rot of their stored food. The study found that warmer temperatures and increased rainfall lead to reduced food quality, affecting female owls' survival.
A new study of over 44,000 species reveals herbivores have consistently faced the highest threat of extinction in modern times, past decades, and the late Pleistocene era. The research also shows that ocean predators are facing greater existential pressures than their land-dwelling counterparts.
A global study by Utah State University researchers suggests that plant-eaters, including megaherbivores, are the most at-risk group for extinction. Human activities have led to the disproportionate extinction of herbivores compared to predators since the late Pleistocene.
Researchers studied angel shark body shapes using modern methods and found that early species had distinct external features, while modern species show reduced variation in shape. The integration of skull parts may limit adaptability, increasing extinction risk.
Researchers found that aquatic beetle Regimbartia attenuata can actively escape from the vent of frog Pelophylax nigromaculatus via its digestive system. The beetle promotes frog excretion to facilitate its escape, and this behavior was observed in four other frog species.
A recent study found that noisy boats and ships can affect the prey response of young fishes, leading to decreased activity and reduced swimming distance. This can result in slower escape responses and increased mortality rates among juvenile reef fish.
Lionfish in Curacao reefs exhibit strong preference for brown chromis over other two prey fish species. The study suggests that lionfish can be picky about their daily menu as long as they are not starving, with poorer condition fish being less selective.
Scientists have found that brown-throated three-toed sloths adapt to a primarily diurnal schedule in highly disturbed environments where predators are extinct and food is more accessible. The study suggests that the animals developed a more synchronous pattern of activity to thrive in the challenging environment.
Researchers found that baby blacktip reef sharks can tolerate the extreme conditions of their nurseries, but these environments face an uncertain future due to climate change. The habitats' dramatic temperature and oxygen fluctuations can be a strain on the young sharks.
A University of Michigan study found that Michigan coyotes in the Upper Peninsula have a less meat-based diet due to coexistence with gray wolves. The researchers analyzed scat samples and gut microbiomes to determine the animal's position in the local food web.
Researchers found that ferrets generalize avian smells, while hedgehogs do not, which could inform strategies to protect bird colonies by saturating the area with bird smell. The study provides insights into the hunting strategies and priorities of invasive predators.
A study by Oregon State University found that Caspian terns have a significant impact on steelhead survival, with predation adding to the annual death toll. The birds' presence was connected to statistically significant decreases in steelhead survival rates, highlighting the need for effective predator management.
Researchers found that addressing habitat loss, snowpack variation, and other factors are crucial to saving the endangered species. The study suggests that a renewed emphasis on securing habitat is necessary to protect mountain caribou from extinction.
Researchers replicated extreme rainfall events in Central and South America's neotropics, finding top-heavy food webs with predators when rainfall varied daily. This altered the trophic structure of bromeliad tanks, affecting energy flow through ecosystems.
Caterpillars of the Lycaenidae family have evolved to associate with ants, which protect them from predators in exchange for sugary secretions. These associations are driven by chemical signals and rewards, allowing caterpillars to minimize energetic costs while maximizing protection.
A new review of lizard data reveals that up to 2.75% of all lizards may have two or more tails, with potential ecological impacts on individual fitness and population dynamics.
A recent study found that tropical reefs are driven by bottom-up forcing, while temperate reefs are more influenced by top-down forcing. Marine reserves increased predator populations in both tropical and temperate regions.
Thylacosmilus atrox, a marsupial from Argentina, was previously thought to be a fierce predator like Smilodon. However, new research reveals it was likely a scavenger, using its canines to open carcasses and possibly its tongue to extract innards. Its skull and teeth show distinct differences from those of placental saber-toothed cats.
Researchers found that moon jellyfish contain essential fatty acids like arachidonic acid and eicosapentaenoic acid, vital for predator growth and reproduction. This suggests that despite low caloric value, jellyfish can be an attractive prey item for predators through sheer quantity.
Research confirms that breeding areas with more open canopies do provide opportunities for timber rattlesnakes to reach required body temperatures, but also increase risk of hawks and bobcats. Forest managers should balance canopy cover and predation risk during future conservation efforts.
The largest fish produce more offspring, while smaller competitors gain an advantage when it comes to finding mates. Females tend to be rarer than males at spawning grounds, and early life-history affects female reproduction.
A Stirling-led project aims to reduce the prevalence of schistosomiasis, a debilitating infection affecting 200 million people worldwide. By boosting native snail predators through aquaculture, researchers hope to control snail populations and limit the spread of the disease.
A recent literature review in Biological Reviews reveals significant knowledge gaps about crocodilians' ecological role, emphasizing the need for future research on population dynamics, feeding and nutrition, and decline impact. The study also highlights San Diego Zoo Global's conservation efforts for crocodilians.
Researchers found that living among land's rich topography forced animals to plan rather than act based on habits, increasing survival rates. The optimal level of barriers in the environment played a crucial role in this planning ability.
Researchers found that Trinidadian guppies use a unique strategy to evade pike cichlid attacks by turning their irises black, drawing attention to their head rather than body. Larger guppies were better at escaping using this method, potentially due to increased size allowing them to reverse the negative effect of reduced agility.
A new study finds that sea otter recovery generates significant economic benefits, including increased tourism and carbon capture, which outweigh the losses to commercial fisheries by up to $46 million annually. However, the costs of recovery are not evenly distributed, with Indigenous communities experiencing disproportionate impacts.
A study found that Night Parrots' visual system is not well-adapted to life in the dark, contrary to expectations. Their eye size and optic nerves are similar to other parrots, with poor resolution vision, making it difficult to distinguish obstacles.
A new Oregon State University-led study reveals that the reintroduction of wolves in Yellowstone National Park has led to an increase in the height of willows in northern Yellowstone. The researchers found that a reduction in elk browsing over the last two decades allowed willows to grow taller, despite a warming and drying climate.
Researchers found Oriental tit birds give distinct alarm calls to snakes and chipmunks, warning nestlings of snake threat but not chipmunk danger. The study suggests a specific call signals 'be aware of a snake' rather than general predator alert.
Researchers analyzed 2-5 million year old fossil teeth to reconstruct body size distribution patterns of the great white shark in the past. The discovery reveals a significant nursery area with high percentages of young sharks, indicating that environmental changes can impact population dynamics and evolutionary success.
Research reveals that European viper's characteristic zig-zag pattern serves multiple functions during predation events, including hiding and producing an illusionary effect. The study resolves theoretical tensions between opposing functions of color patterns, suggesting a broader scope for evolution.
A study recorded spiny lobster antennal rasps at distances of up to 400m, with large individuals detectable up to 3 km away in low-noise conditions. This non-invasive tool helps monitor and survey populations of vulnerable spiny lobsters.
The larvae of beetle genus Toramus attach their exuviae to the distal abdomen and retain them throughout development. This unique behavior may serve as a form of autotomy, allowing predators to remove exuviae without harming the larva. However, further studies are needed to confirm its defensive function.
Research reveals that deep-diving southern elephant seals exploit the bioluminescent flashes of squid and fish to locate prey. The flashes serve as a warning signal for the prey, allowing them to distract potential predators and escape.
A study by Toshitaka Suzuki found that birds can visualize a snake when hearing specific alarm calls from another species. The coal tit was observed to approach the experimental area during these calls, indicating it mentally retrieves 'snake' images.
A study led by University of California, Berkeley researchers suggests that effectively reducing encounters between domestic prey and wild predators requires knowing the principles governing ecological interactions among these players and their surrounding landscape. By considering the ecology of how predators hunt, how their prey beha...
Research finds giant T. rex relied on low-energy walking due to their massive size, contrary to previous focus on running speeds for theropod dinosaurs. The study analyzed limb proportions, body mass, and gaits of over 70 species, suggesting a trade-off between speed and efficiency in theropods.
Male treefrogs synchronize their mating calls with neighboring frogs to create an auditory illusion that attracts predators to the leading call, leaving females unaffected. Researchers found this strategy allows male frogs to find mates without risking their lives.
Researchers observed that monkeys on Coiba spent up to 14.5 minutes on the ground, whereas mainland sites had smaller group sizes and limited ground time. The absence of predators likely played a key role in the behavior.
Researchers analyzed fossil vertebrates from the Kem Kem Group, revealing a diverse array of predators, including flying reptiles, crocodile-like hunters, and giant fish. The study provides insights into Africa's Age of Dinosaurs and sheds light on the Sahara's ancient past.
Researchers studied Aegean wall lizards on predator-free islands and found they rapidly developed new chemical signals distinct from their source population. This change occurred after only four generations and offers a unique opportunity to understand animal communication.
A new computer model, ApoSim, simulates the evolution of various prey behaviors, including permanent and switchable warning signals. The model explores how predators' learning speeds impact evolutionary outcomes, providing insights into the diversity of prey defenses.
Researchers analyze 13,000-year-old fossils to understand the origin of light-scattering nanostructures in insects, which create colorful iridescent colors. The study finds that these structures may have evolved as a means of camouflage, with similar color patterns maintained over hundreds of thousands of generations.
Researchers found that black rhinos carrying oxpeckers are better at sensing and avoiding humans than those without the birds. Oxpeckers' alarm calls help rhinos detect humans from a safe distance, allowing them to reorient themselves to face downwind.