Articles tagged with Wild Populations
A new study by WCS and USGS found that wild tigers in India's Nagarahole National Park lose nearly a quarter of their population each year, but total numbers remain stable due to high reproductive rates and abundant prey. The study highlights the need for protected areas with high prey densities and anti-poaching efforts.
The Wildlife Conservation Society proposes a simpler, four-tiered system to measure conservation success for wildlife populations. The system aims to move beyond demographic sustainability and focus on ecological functionality, where species serve their role in ecosystems.
A groundbreaking study shows that fishing can promote fluctuations in targeted fish populations, increasing uncertainty and risk of collapse. The study analyzed CalCOFI data to find that fishing selectively culls larger individuals, leaving a stock of near-juveniles less able to cope with environmental pulses.
Research finds that commercial fishing causes significant variability in exploited fish populations, leaving them vulnerable to collapse. The study suggests that managing fish stocks must account for this increased variability to ensure their long-term sustainability.
Scientists developed a DNA chip to monitor Atlantic salmon health and performance, identifying genes that influence key traits such as disease resistance, oil production, and growth efficiency. The chip will help farmers assess stock accuracy and conservationists sample wild populations.
A comprehensive study finds tiger habitats have declined by 40% since last decade, with only 7% of historic range remaining. The report identifies 76 tiger conservation landscapes that can support viable populations, calling for increased protection and international cooperation.
The Wildlife Conservation Society has launched the 'Tigers Forever' initiative, aiming to increase tiger populations in key areas by 50% over a decade. The program involves working with local governments and partners to track tigers and boost anti-poaching activities.
Researchers used DNA sequence profiling to re-examine the giant panda population in Wanglang Nature Reserve, doubling earlier estimates and finding no genetic evidence of a demographic bottleneck. The study suggests the species may have a better chance of long-term viability than previously thought.
A recent study using DNA analysis from giant panda feces found the population underestimated by over 50% in previous surveys. The findings suggest a better chance of long-term viability for the species, but warn against complacency due to still-perilously low numbers.
The US government has approved a multi-million dollar surveillance network to track the avian flu virus overseas. The Global Avian Influenza Network for Surveillance (GAINS) will provide valuable forecasts on viral storms, enabling the prevention of avian flu spread and preparation for outbreaks.
A 14-year study of wild capuchin monkeys reveals that fathers almost never mate with their daughters, despite alpha males siring most offspring from unrelated females. This suggests the evolution of sophisticated behavioral barriers to prevent inbreeding within individual populations.
Research reveals farmed salmon have evolved genetically differently to wild salmon, backing claims of negative impact on health. The study found 20% difference in genes and potential for hybridization altering wild salmon's fitness.
A new MIT sensor system tracks enormous fish populations over a vast area, revealing the first-ever images of these groups. Researchers observed fractal patterns and 'waves' of population density, potentially indicating communication among fish.
A recent study using genetic data demonstrates a drastic decline of orang-utan populations on the island of Borneo, coinciding with colonial powers' arrival and accelerated timber extraction. The research highlights the urgent need for conservation efforts to protect the species.
A recent study by UC Riverside graduate student Matthew Walsh found that harvesting large individuals from a fish population introduces genetic changes that harm the overall fish population. The remaining fish become progressively smaller, have fewer and smaller eggs with lower survival rates, and lower foraging and feeding capabilities.
Researchers propose 'Darwinian debt' as a key factor in fish stock depletion, suggesting that species' inability to adapt to changing environmental conditions leads to population decline. This concept challenges traditional views on conservation and management strategies for marine ecosystems.
Researchers analyzed genetic data and outbreak patterns to find that the Zaire strain of Ebola virus is spreading as a wave from its first epidemic in Yambuku, Gabon. This suggests that the virus may reach populated areas within 1-2 years and devastated gorilla populations in 3-6 years.
Researchers will explore the Oculina Bank's deepwater coral reefs, which support dense and diverse populations of fish species and are critical breeding grounds for commercially important populations. The team aims to verify a newly produced high-resolution sonar map and assess the extent of the reefs to inform protection efforts.
The mosquito fish's reproductive habits rely on male coercion, which is affected by environmental temperatures. Females select for strong male genes and adapt their behavior to optimal temperatures.
A study found that maximum avoidance inbreeding strategies can help reduce population crashes and extinction risk when released into the wild. This approach is more effective than limited inbreeding for certain species.
Research using mitochondrial DNA identified two distinct populations in Algeria and Morocco as founders of the Gibraltar macaque population. The study found that the Gibraltar macaques retained a surprisingly high level of genetic variability despite long-term isolation.
A recent study reveals the far-reaching impact of salmon farms on wild juvenile salmon, with sea lice infections increasing by 73 times near the farm and extending 30 km beyond. The research sheds light on the critical threat posed to dwindling wild salmon populations in British Columbia.
A study by UC Berkeley researcher Alan Krakauer found that subordinate male wild turkeys benefit indirectly from helping their dominant brothers breed, gaining an average of 1.7 offspring. This cooperative behavior is a key example of kin selection, which favors cooperation over selfishness.
Researchers have discovered that older fish produce exponentially more larvae, which are crucial for the survival and growth of younger fish. Removing these older fish can lead to a 'Darwinian debt' for future generations, where evolutionary damage is difficult to repair.
Researchers question current fisheries management practices, highlighting the importance of older fish in maintaining productive populations. The study reveals that eliminating older generations drastically reduces a population's ability to replenish itself, leading to collapse of West Coast fisheries.
A diverse network of marine protected areas may be essential for restoring depleted groundfish stocks. Older fish produce more eggs with increased survival chances for larvae, which can grow faster and survive starvation longer.
In a groundbreaking study, researchers confirmed that wild capuchin monkeys in northeastern Brazil routinely crack open palm nuts using heavy stones. The behavior was previously observed only in chimpanzees and other primates. This finding expands our understanding of tool use among non-human primates.
A new tiger subspecies has been identified through a genetic analysis of over 130 tigers, suggesting six living subspecies rather than the traditional five. The study provides valuable data for conservation strategies and captive breeding programs to combat the decline of wild tiger populations.
A team of scientists identified genomic regions in wild tomato species that boost yield and drought resistance, outperforming commercially available hybrids. Their approach harnesses natural biodiversity to enrich the genetic basis of cultivated plants.
A new species of coral-dwelling goby was found in Papua New Guinea and is closely related to another goby species. Genetic analysis reveals that the two species diverged from each other around 200,000 years ago due to host shift, suggesting sympatric speciation by host shift as a plausible explanation.
A study found that zebra mussel invasion leads to population declines in open-water fish like American shad, while sunfish species increase in abundance. The mussels' grazing on food particles and increased light penetration create more food for shoreline fish.
The study suggests that lakes can have either a high or low abundance of invasive rusty crayfish, favoring native species or altering fish populations. Researchers believe alternate states of crayfish abundance may exist among lakes, allowing for strategies to remove these invaders and restore habitats.
A long-term study by Cornell University finds that marine-organism disease is increasing in some taxa, such as turtles and mammals, but declining in fish due to over-fishing. However, disease rates are still too low to be observed for many populations of wild fish.
A team of six leading ecologists warn that hatchery fish cannot save wild salmon populations, and urges NMFS to exclude them from population counts. The panel recommends protecting habitats to ensure robust wild populations, as hatcheries can dilute gene pools and alter behavior.
A Canadian researcher finds a strong link between sea lice from salmon farms and declining native salmon populations in BC. Meanwhile, an opposing expert suggests other factors are at play and that correlation does not necessarily imply causation.
Purdue scientists Rick Howard and colleagues discovered that genetically modified fish have a reproductive advantage, but their offspring are less likely to survive. This paradox could lead to a population dwindling in size and potentially disappearing entirely if not managed carefully.
Researchers used mathematical models to investigate transgene escape from confined crops, finding a high probability that leakage can occur sooner than expected. The study suggests that even with effective containment strategies, genes can still spread to wild populations within a relatively short time frame.
Researchers at the University of Wisconsin-Madison developed mathematical models to understand the effects of gene flow from crops to wild plants. The models show that crop genes can rapidly take over wild populations, leading to genetic changes, population decline and loss of natural traits.
The Wildlife Conservation Society reports a substantial increase in Tibetan antelope, wild yaks, and other species due to enhanced protection. The increased numbers are attributed to better enforcement and education, but challenges persist in managing human-wildlife conflicts.
Farm-raised male salmon outcompete wild males in spawning events, fertilizing large numbers of eggs with their rapid maturity and high reproductive performance. This accelerates the gene flow into native populations.
A field study by Vanderbilt University and Indiana University found that wild sunflowers already possess some level of resistance to white mold, reducing the need for genetic modification. The study suggested that transgenes may not spread widely through wild populations if they do not confer a reproductive advantage.
A study published in Nature reveals that wild chimpanzee and gorilla populations have declined by over 50% in the past few decades, with an estimated 80% decline expected within 30 years. The researchers attribute this to illegal hunting and Ebola outbreaks, highlighting the need for improved anti-poaching laws and Ebola research.
A recent study reveals significant discrepancies in shark fin trade reports, with estimates suggesting under-reporting of 24-49% compared to Hong Kong's quantities. The study highlights the need for continued monitoring and analysis in key seafood trading centers like Hong Kong.
A recent study uses sunflowers to predict the likelihood of genes from hybrid crops entering wild populations. The research found that domesticated crop genes can persist even when hybrids perform poorly, suggesting a challenge for controlling their spread.
Research suggests hatchery steelhead do not harm wild steelhead, but may jeopardize wild chinook survival rates. Studies reveal a strong negative association between hatchery steelhead and wild chinook smolt-to-adult survival.
A recent study found that only a small proportion of individuals produce large numbers of offspring that survive, threatening the genetic diversity of marine fish populations. With millions of fish remaining, even a few hundred capable breeders can be insufficient to sustain genetic variability.
A new study by Oregon State University researchers found that removing any one species from a marine food web can have devastating effects, leading to population collapse and regional extinction. The study's findings highlight the importance of preserving biodiversity in marine ecosystems.
Researchers found a decline in genetic diversity in Tasman Bay's New Zealand snapper population, starting from the 1950s when it began to be commercially fished. The 'virgin' population showed a significant decline in six of seven microsatellite loci, raising concerns about the sustainability of commercial fishing industries.
Researchers found that selective fishing practices can lead to dramatic changes in fish size, affecting growth rates and productivity. They propose rethinking minimum size restrictions and establishing no-take reserves to manage fisheries sustainably.
A genetic model found that hatchery salmon can develop 'captive traits' and introduce them to wild populations, decreasing their survival rate. Conservation efforts, such as conserving or restoring habitats, may be effective in preventing this shift.
A study by Kevin Lafferty and Leah Gerber found that non-otter diseases, such as parasitic worms and toxoplasmosis, are contributing to the decline of California sea otter populations. Improving waste disposal and reducing human exposure to these diseases may help protect the otters.
Researchers used paleoenvironmental techniques to study West Coast salmon populations over 2000 years, finding low population numbers in ancient periods solely due to natural fluctuations. Climatic change is the primary cause for past fluctuations, while humans have contributed to decline, particularly in southern range.
Researchers have discovered a new method to isolate and understand the chemicals released by male sea lampreys to lure females. The study reveals that males release pheromones, not females, to initiate mating, offering potential new strategies for controlling sea lamprey populations.
Scientists have identified a genetic marker that points to Mexico as the origin of domesticated squash, contradicting previous theories. The study used mitochondrial DNA genetic markers to analyze the relationships between wild and domesticated Cucurbita pepo populations.
Research found giant pandas have moderate genetic diversity compared to other carnivores, with some populations showing signs of isolation. To ensure the species' survival, conservation efforts focus on restoring gene flow among populations through natural corridors and ecological restoration.
A study found that genetic traits from crops can persist in weeds for generations, potentially leading to hardy and hard-to-kill weeds. This raises concerns about the long-term impact of transgenic crops on weed populations.
A UMass researcher has found that new species can arise in as little as 12-14 generations, rather than the previously accepted maximum of 200-400 generations. This discovery suggests that adaptation can lead to reproductive isolation at a much faster rate than previously thought.
Several mesocarnivore species, including marten, fisher, and red fox, have staged remarkable recoveries in the Northeast. However, wolves and cougars, two large predators native to the region, continue to face challenges due to persecution and habitat loss.
A recent study by Dr. Whit Gibbons has discovered the smallest and youngest non-hatchling Blanding's turtle ever recorded, just two and a half inches long and four years old. The finding highlights the importance of understanding the species' life cycle and habitat needs to inform conservation efforts.
Researchers analyze three whale species to assess their recovery status and develop novel approaches to understanding decline. The study highlights the difficulties in determining when a population has recovered, emphasizing the need for data-driven conservation policy.