Even at sublethal levels, pesticides may slow the recovery of wild salmon populations
Exposure to common pesticides limits wild salmon growth and size; improving water quality conditions could potentially increase the rate of recovery
Wild Populations
Articles tagged with Wild Populations
Nepal expands critical tiger habitat
The Government of Nepal has expanded Bardia National Park in the Terai Arc Landscape to increase critical tiger habitat. WWF welcomes the move and aims to help the country double its number of endangered tigers through innovative conservation strategies.
Report documents the risks of giant invasive snakes in the US
The USGS report highlights five giant non-native snake species that pose high ecological risks to the US, including Burmese pythons, anacondas, and boas. These snakes have been documented reproducing in the wild in South Florida and can attack and kill people, posing a small risk.
A new chemical method for distinguishing between farmed and wild salmon
Researchers have developed a technique to distinguish between farmed and wild salmon by analyzing the chemistry of their scales, which grows like tree rings and preserves a record of the water they lived in. The new method achieved 98% accuracy and has the potential to identify farms responsible for releasing wild fish into rivers.
River flow and temperature limit trout numbers
A 23-year study by Javier Lobón-Cerviá reveals that environmental conditions, including river flow and temperature, significantly impact trout populations. The research shows that optimal conditions for young trout development are characterized by average river flow and suitable temperatures.
Sick fish may get sicker
Fish populations are being increasingly affected by emerging diseases, exacerbated by climate change and other stresses. As a result, population fluctuations, extinction, reduced health, and increased susceptibility to predation are expected, according to Dr. Jim Winton of the USGS Western Fisheries Research Center.
Sichuan earthquake caused significant damage to giant panda habitat
The Sichuan earthquake in 2008 destroyed nearly a quarter of the giant pandas' habitat, with over 354 square kilometers converted to bare land. Habitat fragmentation is also a significant concern, as it can lead to population isolation and increased risk of extinction.
Disease threat may change how frogs mate
Research by Dr. Amber Teacher reveals that wild frog populations in the UK are changing their mating behaviour in response to Ranavirus infection, with healthy frogs selecting mates based on their Major Histocompatibility Complex (MHC) type.
US-Mexico border wall could threaten wildlife species
A new study suggests that a 700-mile US-Mexico border wall could significantly alter wildlife movement and connectivity, threatening populations of some species. Design tweaks and technology can improve animal movement, but the impact on biodiversity is still uncertain.
Kenya's national parks not free from wildlife declines
A study found long-term declines of elephants, giraffe, and other animals in Kenya's national parks are occurring at the same rates as outside the country. The research highlights the problems of maintaining protected areas on wildlife and ecosystems inside and outside the parks.
Hatchery fish may hurt efforts to sustain wild salmon runs
A new study published by Oregon State University researchers found that hatchery fish significantly impair the reproductive fitness of their offspring, even if they survive and reproduce in the wild. This could be hurting efforts to sustain wild salmon runs, scientists said.
New study shows widespread and substantial declines in wildlife in Kenya's Masai Mara
A new study reveals widespread and substantial declines in wildlife populations in Kenya's Masai Mara National Reserve. The researchers found that a growing concentration of human settlements near the reserve is linked to large losses of wildlife, including giraffes, hartebeest, impala, and warthogs.
Largemouth bass vulnerability to being caught by anglers a heritable trait
Researchers found that largemouth bass vulnerability to being caught by anglers is influenced by genetic factors. The study showed that repeated catches increase an individual fish's susceptibility to angling, making it more vulnerable to future catches.
You don't call, you don't write: Connectivity in marine fish populations
A new study reveals the remarkable ability of marine fish larvae to disperse over long distances, connecting populations across marine protected areas. The research provides critical insights into larval dispersal patterns, which affect population resilience and ecosystem dynamics.
New tracking tags are providing fish-eye views of ways to manage depressed fisheries
A new study by Cornell University uses advanced tracking technologies to monitor declining fish populations. The research reveals that mixing of stocks is a major issue in unsustainable fishing practices, highlighting the need for updated management strategies.
Black wolves: The first genetically modified predators?
A new study reveals that black wolves, the first genetically modified predators, have adapted to changing environments thanks to human dog breeding. The trait, which originated from domesticated dogs, has proven valuable for wolf populations as their arctic habitats shrink.
Gene-engineered flies are pest solution
Researchers have created gene-engineered male flies that die as embryos, outcompeting wild pests and reducing crop damage. This new method of pest control eliminates the need for radiation, increasing safety and effectiveness.
UGA study may give hope that ivory-billed woodpeckers still around
A UGA study by Warnell researchers found that just five breeding pairs of ivory-billed woodpeckers could have ensured the species' persistence in southeastern US forests. The analysis suggests sufficient reproduction and survival rates are more important than large numbers of individuals.
As super-predators, humans reshape their prey at super-natural speeds
A new study reveals human predation is accelerating trait changes in commercially harvested species, with 20% smaller body sizes and 25% earlier first reproduction compared to previous generations. This process has been observed at a rate 300% above natural systems and 50% faster than other human influences.
A fisheries catch-22
A review of salmonids reveals that captive breeding can rapidly lead to genetic diversity loss, hindering the ability of fish to adapt in the wild. The study highlights the need for more data and alternatives to captive breeding, such as live freezing or population relocation, to conserve biodiversity.
Orangutan's spontaneous whistling opens new chapter in study of evolution of speech
Researchers have documented a primate mimicking a sound from another species without specific training, shedding light on the evolution of speech and learning in orangutans. The study's findings suggest that orangutans can learn new sounds and use them voluntarily, opening up new avenues for studying human speech evolution.
Research pushes back history of crop development 10,000 years
A new mathematical model developed by researchers at the University of Warwick suggests that plant agriculture began much earlier than previously thought, around 23,000 years ago. The study found that useful gene types took thousands of years to become stable and that crop development was a slow process.
Photos reveal Myanmar's large and small predators
Researchers from WCS have gathered data on Myanmar's tiger and smaller carnivore populations using remote camera traps, revealing estimates of 7-70 tigers in the Hukaung Tiger Reserve. The study also confirms the existence of 18 smaller carnivores across various habitats.
Scavenger birds chew the fat
A study found that bearded vultures choose bones with the highest fat content for their consumption and delivery to their young. This finding has significant implications for conservation efforts, as it suggests that providing the most nutritious bones in feeding programs can aid in the expansion and breeding of this endangered species.
Recovery efforts not enough for critically endangered Asian vulture
A University of Michigan analysis shows that captive breeding colonies are too small to protect the critically endangered Asian vulture from extinction. Adding wild birds to the captive colonies is crucial but hampered by political and logistical barriers.
Commercial bees spreading disease to wild pollinating bees
New research reveals that commercial bees are infecting and spreading diseases to wild pollinators, contributing to declining pollinator populations. The study found that commercially produced bumble bees carry a harmful pathogen that can be transmitted to wild bees at flowers.
Frogs with disease-resistance genes may escape extinction
Researchers identified certain genes that enable frogs to develop resistance to harmful bacteria and disease. The discovery may provide new strategies for protecting frog populations in the wild by selectively breeding individuals with known disease-resistance genes.
Great Ape Trust's Wich lead author of Oryx paper on continuing orangutan population declines
New estimates from Great Ape Trust reveal declining orangutan populations, with 75% living outside national parks. Conservation efforts must focus on island-specific action to address ecological threats.
Attitudes toward consumption and conservation of tigers in China
A recent study published in PLOS ONE found that a significant proportion of Chinese consumers admit to purchasing tiger products, despite widespread support for the country's ban on selling these products. The researchers also discovered that 71% of respondents preferred products made from wild tigers over those from farmed tigers.
Hatchery fish outnumber wild chinook salmon in troubled fall run
A study by University of California - Santa Cruz researchers found that 90% of California's fall-run Chinook salmon population comes from hatcheries. The findings are troubling given the decline in natural populations, which may force commercial and recreational fishing to close.
5th annual Keys bonefish population census results announced
The 5th annual Keys bonefish population census has shown a fairly steady population of approximately 364,000 bonefish, indicating reliable research methods. The study also highlights the importance of understanding the bonefish population for environmental conservation and sustainable tourism in Florida.
To save or savor? It's decision time for Atlantic bluefin tuna
New research reveals two genetically distinct populations of Atlantic bluefin tuna, raising concerns about current fisheries-management practices and the impact of trans-Atlantic tourism on fish stocks. The study suggests that Mediterranean-spawned fish are flocking to the western Atlantic, potentially making it appear healthier than i...
Fish devastated by sex-changing chemicals in municipal wastewater
Researchers found that miniscule amounts of synthetic estrogen in municipal wastewater can decimate wild fish populations living downstream, causing feminization and reproductive issues. Removing estrogen through wastewater treatment can reverse the adverse impact on wild fish populations, offering a glimmer of hope for recovery.
Dramatic declines in wild salmon populations are associated with exposure to farmed salmon
A new study reveals that farmed salmon exposure leads to significant declines in wild salmon survival rates, threatening global salmonid populations. The research found a 50% reduction in wild salmon abundance when associated with salmon farms, highlighting the need for sustainable aquaculture practices.
Hybridization partially restores vision in cavefish, NYU study finds
Researchers at NYU have found that hybridizing blind cave fish from different populations can partially restore their vision. The study suggests that genetic engineering can override centuries of evolutionary change in one generation.
Wild chimpanzees appear not to regularly experience menopause
A study of wild chimpanzees found they do not experience menopause, unlike humans and most other primates. In contrast to human females with several decades of post-reproductive life, chimpanzee reproductive declines occur in tandem with overall mortality.
Fish farms drive wild salmon populations toward extinction
A study reveals that fish farms are causing a severe decline in wild salmon populations by infecting them with sea lice, which can lead to a 99% collapse of the population within four years. This has serious implications for the entire ecosystem, as salmon play a crucial role in supporting various industries and wildlife.
The 'bear' necessities of aging
A new study published in PLOS ONE found that bears' selective feeding habits on salmon with less signs of senescence accelerates the aging process in these fish. The research suggests that predation pressure is a primary driver of senescence, rather than the physical characteristics of the prey.
UW launches cutting-edge DNA 'fin-printing' project for salmon
The University of Washington's new DNA fin-printing project aims to create open-access databases for Pacific salmon populations, helping managers and scientists understand their ocean migration. By employing genetic markers, researchers can distinguish between individual fish and track population movements, informing conservation effor...
Salmonid hatcheries cause 'stunning' loss of reproduction
A new study by Oregon State University reveals that rearing steelhead trout in hatcheries causes a dramatic drop in their ability to reproduce in the wild, with reproductive success dropping by up to 40% per generation.
New paper examines dams' effects on California salmon
Researchers at Duke University warn that dams in California's Central Valley are harming spring-run Chinook salmon populations by blocking access to habitat and fragmenting these populations. The study suggests removing dams could help alleviate water shortages and aid fish species.
Edible fish feasts beats malaria
Nile tilapia significantly reduced Anopheles gambiae and Anopheles funestus mosquito populations by over 94%. The sustainable method provides a win-win situation for Kenyans, offering food and income while controlling malaria.
Longest study finds reef fish need longer break
Researchers found that commercially important species take a quarter of a century to recover fully, while ecological equilibrium takes even longer to achieve. Fish recovery rates vary among species due to competition for resources.
Viable tiger populations, tiger trade incompatible
The wild tiger population has declined dramatically due to habitat loss and poaching, with only 7% of their historical range remaining. Experts warn that China's potential reopening of the tiger trade poses a new threat to the species' survival.
Threats to wild tigers growing
The wild tiger's population has declined by 41% over the past decade due to habitat loss and trade in tiger parts. Successful conservation programs, such as those in India and Nepal, have shown promise in protecting the species.
Coral reef fish make their way home
A recent study found that coral reef fish hatchlings can successfully return to their home reefs, with about 60% of young clownfish and butterflyfish making it back. The research also showed significant exchange between populations separated by open sea, highlighting the importance of marine protected areas.
Nemo comes home with a tag
Researchers have pioneered a new way to study fish populations by 'tagging' adult fish with a harmless isotope, enabling them to understand the extent to which young fish return to their 'home' area or go off to interbreed. The findings reveal that around 60% of juvenile clownfish returned to the home reef, while 40% came from distant ...
Help comes in the mail for drinkers
A new study led by the University of Alberta found that mailing brief self-help materials to interested drinkers in the general population reduced binge drinking by 10%. The study provided self-help materials to 877 male and female drinkers, aged 43, who were recruited from the general population.
Manipulating nature: Scientists query wildlife birth-control method
Researchers warn that an immuno-contraception vaccine, which aims to control wildlife populations, is not fully effective and may manipulate natural reproduction in unpredictable ways. The vaccine also raises concerns about the potential for individuals who survive the vaccine to carry infectious diseases affecting other animals.
UCR researchers examine how some invasive plants gain a foothold
Researchers found that controlling sexual compatibility in self-incompatible plants like the California wild radish can help minimize their reproductive success and prevent establishment. Larger population sizes and genetic diversity also boosted reproduction, highlighting potential strategies to combat invasive plant spread.
Wild tigers need cat food
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.
Save the whales? Sure, but how many?
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.
Commercial fishing causes dangerous fluctuations in fish populations
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.
Ocean data confirms fishing puts targeted species in 'double jeopardy'
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.
Special chip provides better picture of salmon health
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.
New tiger report release: Tiger habitat down from just a decade ago
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.
Tigers get a business plan
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.
Molecular censusing doubles estimate of key giant panda population
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.
Brighter future for giant panda?
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.
US gov't approves multi-million $ wild bird avian flu surveillance network
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.