Articles tagged with Predators
In a new study published in Scientific Reports, researchers at Brown University found that guppy moms in low-predation areas (LP) produce larger offspring with more mature internal anatomy, including wider mouth joints and harder heads. This adaptation enables LP guppies to better compete for food and survive in their environment.
Researchers discovered a massive predatory fish species called Birgeria americana in Nevada's Early Triassic fossils, rewriting the history of apex predators. The find shows that marine ecosystems recovered faster than previously thought, and temperature conditions were suitable for life near the equator.
A recent study found that the scent of a praying mantis can cause fruit flies to spend less time eating, more time being vigilant, and produce fewer offspring, leading to increased extinction risk. The study sheds light on the Allee effect, a long-standing biological conundrum related to population size and extinction.
Invasive giant slug <i>Limax maximus</i> has spread to Hokkaido, Japan, where it is preyed upon by microphagous leech <i>Orobdella kawakatsuorum</i>. The study reveals that the invasive species feeds on various crops including cucumber and sweet potato.
The copepod Calanus finmarchicus uses a genetic clock to regulate its daily vertical migration, which is likely the largest daily movement of biomass worldwide. This internal rhythm influences the entire food web in the North Atlantic and has significant implications for marine ecosystems.
Researchers found that small 'weedy' species will thrive in high CO2 environments, dominating marine biodiversity. The study suggests that reducing overfishing of intermediate predators could delay biodiversity loss and ecosystem change.
Researchers expose burrowing bettongs to feral cats, observing improved evasion behaviors and increased vigilance. The study suggests this technique could aid the reintroduction of threatened Australian mammals onto the mainland.
A new study by Oregon State University researchers found that American bullfrog embryos can learn about predators while still in the egg, developing faster and hiding more when exposed to predator signals. This allows them to avoid becoming vulnerable prey, making it harder to control their spread.
The study found a strong correlation between predator size and the diameter of drill holes, suggesting that larger predators have hunted smaller prey in the past. The researchers believe that growing bigger predators may not need to switch to larger targets due to more nutritious small prey.
Researchers found that as predators grew in size, they targeted smaller prey rather than larger quarry, suggesting a shift in ecological dynamics. The study's findings support the escalation hypothesis, which posits that top-down pressure from larger predators drove key evolutionary developments in prey species.
A new study reveals that marine invertebrate predators have increased in size over the past 500 million years, while their prey has remained relatively constant. The 'escalation hypothesis' is supported by the findings, which show a significant increase in predator-prey size ratio driven by changes in marine ecosystems.
Research by University of Exeter scientists shows motorboat noise reduces fish survival rates and changes parental behavior, with increased aggression and reduced feeding among affected males. Motorboat noise is considered a global pollutant, distracting fish from protecting their young.
Researchers have found that red light has no significant effect on the activity of slow-flying, light-shy bats. In contrast, white and green light substantially reduce their activity levels, making red light a potential solution to mitigate habitat loss.
Researchers discover lionfish preying on a newly named deep-sea fish species in the Caribbean, raising concerns about biodiversity loss and ecosystem disruption. The finding suggests that invasive lionfish are extending their range to the unexplored 'twilight zone,' where little is known about reefs or resident species.
Research shows that top predators like wolves need continuous territories to effectively control ecosystems. Fragmented wolf populations, such as in North America, are unable to control smaller predators like coyotes.
A new study reveals a global pattern of caterpillar predation driven by tiny arthropod predators like ants, contrary to expectations. The trends show that caterpillars near the Equator are eight times more likely to be eaten than those at the poles.
A global pattern in predation on insect herbivores has been discovered using 'dummy caterpillars', revealing that tiny arthropod predators like ants drive the increase in predation risk towards the Equator. The study found a significant decrease in predation risk near the poles, with a corresponding increase near the Equator.
Researchers used time-lapse photography to study interactions between predatory fishes, urchins, and algae in the Galapagos Marine Reserve. The findings show that triggerfish control pencil urchin abundance, affecting algae consumption, while green urchins are not preyed upon by fish.
A study by Lund University found that bold common roaches, known for their bravery, are twice as likely to be eaten by cormorants. Shyer individuals, on the other hand, survive to a greater extent in the wild. The researchers' focus on behavioral traits rather than morphology provides new insights into predator-prey interactions.
Researchers found that in areas with high predation risk, fish differentiate into leaders and followers, leading to increased shoal cohesion. The study suggests that decision-making in social groups can adapt depending on ecological factors.
Researchers found that two species of triggerfish control pencil urchin populations, reducing their consumption of algae. This mid-level predator has a strong impact on the coastal ecosystems' vitality.
Ghost crabs actively select dark sand for dark-colored individuals and light sand for light-colored ones, showcasing active choice in crypsis. This behavior has implications for understanding anti-predator adaptations and evolution.
A UTA Ph.D. student is awarded a grant to investigate how eyes and brains evolved in response to predation, exploring the relationship between eye size and survival rates in Caribbean killifish populations.
Researchers found that competition among grazers, such as herbivorous fishes and algae, structures the space use patterns and feeding behaviors of bulletheads. The study suggests that predation risk has a limited impact on prey foraging behaviors in areas with high levels of competition.
Researchers from the University of Exeter used online computer games to test animal camouflage and colour vision. They found that trichromats, like humans, outperformed dichromats in finding camouflaged prey, but dichromats improved faster over time.
Researchers created digital food web capturing human interactions with environment, revealing how humans disrupted existing ecosystems when introducing corn and altering food sources. The study sheds light on future human choices and climate change impacts.
Wolves in Yellowstone National Park prefer to hunt elk over bison despite bison being more abundant, likely due to the danger posed by larger prey.
Gray wolves and other large predators are adapting to human-modified environments by changing their social structures, movements, and behavior to acquire anthropogenic resources. This phenomenon has serious implications for wider conservation efforts, including wolf reintroduction programs.
Researchers studied how Bdellovibrio bacteriovorus tracks down prey using high-resolution video microscopy. The study found that the bacterial predator uses hydrodynamic flow fields generated by its own swimming movements and those of its prey to bring them in close proximity, increasing the chances of a successful attack.
Researchers found that adult male common wall lizards exposed to humans become habituated and hide less, with yellow lizards being the most tolerant. In contrast, red lizards exhibit increased sensitivity to potential attacks, suggesting a relationship between coloration and antipredator response.
A new study led by University of Nebraska-Lincoln ecologist John Benson found that eastern coyotes hunt moose and other large prey far less frequently than does the eastern wolf. The findings suggest that eastern coyotes have not filled the ecological niche left vacant when the eastern wolf became threatened.
Scientists have discovered fossilized damselflies in Burmese amber that display ancient courtship behaviors, including elaborate leg structures and wing-like features. The findings suggest that damselfly mating rituals may have occurred as far back as the dinosaur era.
Researchers discovered that robber flies employ a constant bearing angle strategy and 'lock on' to their prey at a distance, allowing them to capture small targets. The flies' eyes have been found to have a high spatial resolution, enabling them to detect prey items up to 100 body lengths away.
In a study published in Behavioral Ecology, researchers found that spiders form large colonies in response to environmental conditions, such as heavy rainfall and predation. This discovery contradicts the idea that family bonds drive social behavior, instead suggesting that difficult environments lead to cooperative living.
Researchers found that restoring predators and prey species together is faster and more efficient than pursuing restoration of one species at a time. This approach, also known as synchronous recovery, can lead to significant ecological and economic benefits.
Researchers found that up to 90% of predatory fish are gone from Caribbean coral reefs, straining the ecosystem and coastal economy. Protected supersites could support large numbers of predator fishes, potentially boosting the economy through tourism.
A new study by University of California - Santa Barbara researchers found that synchronously restoring predator and prey species speeds recovery efforts of both. This approach is nearly always more efficient and on average about twice as fast as sequential recovery.
A new study suggests reducing pressure on both predators and prey simultaneously is the most effective way to help their populations recover. This approach, known as synchronous recovery, has been shown to produce faster and more direct recovery rates than sequential approaches.
Researchers found that moths in the subfamily Arctiinae mimic wasps to evade birds and other predators. However, their nearly perfect resemblance is not due to learning from experience, as previously thought, but rather to deceive actual wasps into thinking they are part of the same species, thereby avoiding attack.
A study found that male birds' mobbing behavior, such as dive bombing and aerial swoops, serves not only as protection against predators but also as a way to showcase their physical qualities to attract females. When females from the same species are present, males increase their participation in these displays.
A new study by Vladimir Dinets of the University of Tennessee at Knoxville shows that broad-footed moles feed on the ground frequently during cool, wet nights with fog or rain. This nocturnal foraging behavior makes surface-active moles difficult to observe, and contradicts long-held assumptions about their fossorial lifestyle.
A new miniaturized camera inspired by eagles' sharp vision uses multi-aperture design to capture high-resolution images with improved center sharpness. The 'foveated imaging' system has potential in areas like endoscopy, optical sensors, and surveillance drones.
A study published in PLOS ONE found that around a quarter of snow leopard and Himalayan wolf diets consist of livestock, highlighting the challenges for conserving these endangered species. The research analyzed DNA and hairs in scats from 182 snow leopards and 57 wolves, revealing prey preferences and diet composition.
Researchers discovered wolves kill less often in the presence of brown bears due to competition for food. The consistency of results between two continents suggests that brown bears may be reducing wolf kill rates, but the reasons behind this phenomenon are still unclear.
Research in Fiji Islands reveals that small community-based marine protected areas can be susceptible to attacks by crown-of-thorns sea stars, which can devastate coral reefs. Despite the importance of these protected areas, the findings highlight a new threat that may emerge from degraded areas surrounding healthy ecosystems.
Researchers found that Trinidadian guppies developed stronger and more stable social bonds when they thought predators were in the area. This coincided with smaller social groups, indicating a possible trade-off between forming strong relationships and living in larger groups.
Researchers found that areas with high deer numbers tend to have fewer birds that rely on forest shrubs for nesting and hunting. This is because white-tailed deer eat away at these plants, leading to a decline in songbird populations such as the Hooded Warbler and Prairie Warbler.
Research by University of Bristol scientists found that traffic noise hinders animals' response to warning signals, making them more vulnerable to predators. The study suggests that man-made noise can have a broader impact on information transfer between and within species.
A University of Washington study reveals that invasive marine snails react differently to threat signals compared to native snails. Native snails use multiple sources of information before fleeing or hiding, while invasive snails respond impulsively and hide at the first whiff of danger.
A new study suggests that China's success in sustaining large catches is due to reducing predatory fish populations, allowing preyed-upon species to increase. This approach can lead to increased harvests, but may also have negative impacts on biodiversity.
A new study from Rice University found that smaller, younger predators have a significant ecological impact on pond ecosystems. The research, which involved over 54 test ponds and thousands of hours of data analysis, showed that even the earliest stages of salamander development can lead to lasting changes in the environment.
Researchers found that starlings are safer from predation in larger flocks due to the confusion effect, where predators struggle to target individual birds. The study suggests that this behavior may be one of many functions of these impressive groups in starlings.
UC Riverside-led research quantifies rattlesnake strikes for the first time using portable high-speed cameras, capturing three-dimensional video of a snake preying on a kangaroo rat. The study reveals that snakes can greatly exceed lab observations and that kangaroo rats may use elastic energy storage to evade strikes.
A study from the University of California, Davis found that reef fish are willing to overcome their fear of sharks and eat algae in danger zones. This behavior can help counteract excess algae growth in coral reefs threatened by nutrient pollution.
A study by Thomas Zaret and Robert Paine found that peacock bass introductions led to the extirpation of 60% of native freshwater fish in Gatun Lake. The invasive species still have not recovered, with many other exotic fish introduced over time.
Two studies led by Oxford University scientists found that human activities caused 88% of male lion deaths in Hwange National Park, Zimbabwe. The research highlights the risks faced by lions when they enter farmland or hunting areas, and the need for improved trophy hunting management to protect populations.
Researchers found that guppies with superior mathematical abilities were better at distinguishing between bigger and smaller shoals, as well as choosing larger food items. This enhanced cognitive ability led to increased survival rates and foraging success in the wild.
Researchers analyzed incubation rhythms of 32 monogamous shorebird species across 729 nests, finding significant within- and between-species diversity. The study suggests that the risk of egg loss from predators is a key factor determining incubation bout lengths, with cryptic nest behavior influencing this relationship.
A global-scale survey of 100 snake species has found a larger number of snakes with a mutation that protects them from the deadly toxins stored in toad skin. The research reveals these mutations occur in a wider range of species than previously believed, challenging the initial assumption they were limited to toad-eating snakes.
Researchers found two snail species in Japan and Russia that use their shells to hit and knock over carabid beetles. This active defense strategy is unique and suggests the importance of predator-prey interactions in animal evolution.