Articles tagged with Population Biology
Researchers found that great-tailed grackles are expanding their range into urban and arid environments due to increased behavioral flexibility. This allows them to adapt to changing conditions and find new food sources. In contrast, boat-tailed grackles only expanded slightly northwards in response to climate change.
A new report highlights Vietnam's high reptile diversity, with 484 known species, including 74 threatened with extinction. The study recommends increasing breeding populations to maintain suitable numbers for restocking, and modern zoos can play a crucial role in conservation efforts.
A new species of the Persian Gold Tarantula has been discovered in northwestern Iran, belonging to the genus Chaetopelma. The newly described species, Chaetopelma persianum, is an obligate burrower and inhabits high elevations in well-vegetated mountainous regions of the northern Zagros Mountains.
A new biodiversity study shows that even seemingly healthy ecosystems with increasing species numbers may already be on the path to decline and loss of species. The study's findings suggest that species richness is not a reliable metric for monitoring ecosystems, as it can mask negative trends in species extinction.
Current measures to protect grasslands in the Qinghai-Tibetan Plateau are damaging the ecosystem and should be stopped. Small burrowing mammals, like the plateau pika and zokor, play crucial ecological roles in maintaining ecosystem health and biodiversity.
A worldwide decline in insect populations is attributed to land-use intensification, climate change, and the spread of invasive animal species. The consequences of this trend include a loss of biodiversity, reduced pollination services, and increased risk to food sources for animals.
A new plant species, Carex quixotiana, has been discovered in the La Mancha region of Spain, specifically known for being the setting of Miguel de Cervantes' classic novel Don Quixote. The species is a type of sedge with unique characteristics and limited distribution.
The Cinereous Vulture has been reintroduced to Bulgaria after being extinct for 36 years. The successful re-introduction campaign, led by Green Balkans and other organizations, involved importing 72 birds from Spain and European zoos. The team recommends the aviary method and delayed release for establishing a new core population, and ...
A genetic census has been used to estimate the number and population structure of critically endangered western chimpanzees in West Africa. The analysis identified a total of 136 chimpanzees living in four different communities, with high levels of shared ancestry and genetic diversity.
The Chinese sturgeon, critically endangered with a limited spawning ground, has a polygynandry mating system and breeding interval of 2-6 years. Genetic diversity remains relatively high despite inbreeding coefficients indicating low detrimental effects on offspring.
Researchers from Xi'an Jiaotong-Liverpool University identify vital differences between the plants, including pollinators and lifespan, confirming their classification. The study highlights the importance of recognizing every species for conservation programs.
A new study reveals climate-driven conflicts between humans and wildlife are on the rise globally, with six continents experiencing exacerbation of these conflicts. The research identifies trends in human-wildlife conflicts linked to climate change, including altered animal habitats, resource availability, and changes in wildlife behav...
Bowhead whales are shifting their migration patterns due to declining sea ice in the Arctic, affecting their long-term health and impact on Indigenous communities. The lack of ice is causing changes in bowhead availability for hunters, leading to competition for resources and increased human interaction.
A global registry for gene-drive modified organisms could facilitate transparent communication, monitor ecological impacts, and inform local decision-making. Experts agree that a registry is necessary for the fair development, testing, and use of gene-drive technologies.
Researchers at UC Santa Barbara discovered that the ecology of small mammals upon which ticks feed can explain rates of human Lyme disease in California. The study found a clear link between infected ticks and their frequent hosts, such as dusky-footed woodrats, with diverse species playing a role in transmission.
A distinct population of oceanic manta rays was identified off the coast of Ecuador, with an estimated total population of over 22,000 individuals, making it more than 10 times larger than any other known subpopulation. The population is large and potentially healthy due to favorable conditions in the region.
Researchers at the Royal Netherlands Institute for Sea Research found an upward trend in skate populations in the North Sea, with a significant increase off Scotland's north coast. The study also revealed that skates mainly eat shrimp, providing ecological potential for more fish to thrive.
Research from the University of Oxford and Yellowstone National Park found that wolves with black coats are more likely to survive canine distemper virus (CDV) outbreaks. This suggests that the gene for a black coat may provide protection against the virus, leading to its increased frequency in areas with CDV outbreaks.
A new study by Rice University biologist Tom Miller explores the role of fungi in determining the range limits of plants in Texas. The research reveals that fungal partnerships improve drought tolerance and could potentially extend the range of grasses in response to climate change.
Researchers developed VegSense, an open-source application that uses a Microsoft HoloLens to quantify mature trees in the wild. The device excels at detecting relatively healthy forests by capturing vegetation patterns with a holograph-like grid pattern.
A Dartmouth-led study found that urban gardens with rare plant species tend to attract rare bee and bird species. Women, older gardeners, and those living near the gardens are more likely to curate these rare plants, suggesting a cascading effect on biodiversity.
A global survey of biodiversity experts finds that more species are threatened with extinction than previously thought, with estimates suggesting 30% of species have been lost since 1500. The study identifies climate change, pollution, and land-use changes as key drivers of biodiversity loss.
A team of ecologists from CU museum identified over 7,000 organisms, mostly bacteria, in the guts of Rocky Mountain snails collected between 1920 and 2018. The findings show that microbiomes can offer insights into how animals interacted with their environments centuries ago.
Scientists analyzed over 30% of populations in an ecological database and found evidence of chaotic dynamics, contradicting previous findings. The research suggests that intrinsic limits exist to ecological forecasting and caution against equilibrium-based approaches for conservation and management, particularly for short-lived species.
A previously unknown subpopulation of polar bears living in Southeast Greenland has been genetically distinct and uniquely adapted to its environment. The study provides insight into how the species might persist into the future, but highlights the need for careful extrapolation due to limited access to sea ice.
A team of University of Hawaii researchers found that the number of hours of darkness during the lunar cycle triggers mature Hawaiian box jellyfish to swim to shore to spawn. The study also revealed that jellies are likely to come from the lee of Diamond Head Crater, where they benefit from shelter and food.
The Ecological Society of America will hold its 107th Annual Meeting in Montreal from August 14-19, 2022. This year's meeting combines resources and interests of the ESA and Canadian Society for Ecology and Evolution, focusing on theme "A Change Is Gonna Come" exploring global environmental and evolutionary change.
A threatened South American coati was recorded in Canoas, Brazil's fourth most populous city, using a camera trap at a remaining green space. The finding underscores the significance of urban areas for species adaptation and highlights the need for conservation efforts beyond protected zones.
A 12-year longitudinal study in Israel reveals that controlling stray cat populations requires continuous and intensive neutering of at least 70% of street cats. The study also suggests implementing a policy to control cat food resources, ensuring cats are properly fed before neutering, to mitigate rebound effects.
A large-scale study analyzing long-term data on insects from over 900 locations worldwide found little evidence for indicator species. Different groups of insects showed different trends, highlighting the importance of monitoring multiple groups simultaneously to provide guidelines for conservation policies.
A study by Washington State University found that social support can mitigate the risk of heart disease and death in older American Indians. Higher rates of depression symptoms, poor quality of life, and social isolation were linked to increased mortality, but instrumental social support reversed this effect.
Researchers found chytrid infections were more common and intense at higher elevations, with the California red-legged frog being among the most infected. The disease was also more prevalent in Baja California, where 68% of surveyed animals had the fungus, compared to 15% in Southern California.
Researchers identify previously unknown population of white-handed gibbons in Peninsular Malaysia, showing unusual mutations and potential local speciation. The discovery informs conservation efforts for translocation and reintroduction programs.
Researchers employed radiocarbon analysis to determine springtail diet, finding they rely on living plants for food. The study sheds light on the soil food web and its dynamics, with implications for terrestrial carbon cycling.
Research found that damselflies infected with Wolbachia bacterium have reduced genetic diversity, making them less adaptable to changing environments. This could lead to a decline in the species' ability to expand its range and survive climate change.
Researchers found that in dry years, birds funnel into riparian environments due to increased greenness, leading to overcrowding and decreased bird populations. The study highlights the importance of understanding how birds respond to climate change for conservation purposes.
A new study reveals that a female elephant seal's age and experience are more important than ocean conditions in determining the condition of her pup at weaning. Higher population densities lead to smaller pups, but older females outperform younger ones.
Researchers found that high biodiversity enhances ecosystem functions by 20%, with environmental heterogeneity significantly boosting this positive impact. Species richness was more important for ecosystem functioning than species turnover in African ecosystems along Mount Kilimanjaro's elevational gradient.
Researchers in Peru have estimated the population density of spectacled bears and identified an unknown hotspot, revealing over 10 bears per 100 square kilometers. The team also observed the first 'golden' bear with nearly golden fur, sparking further investigation into its unusual characteristics.
A new study finds that male acorn woodpeckers breeding in polygamous groups with one or two other males sire significantly more chicks over their lifetimes than males breeding alone. In contrast, females in polygamous groups leave behind fewer offspring than those in monogamous pairs.
A recent study found that microplastic ingestion by dinoflagellates lowers their growth and abundance, affecting the larger marine animals that feed on them. The impact is significant, with energy transfer up the food chain reduced by as much as 30%.
Researchers analyzed over 100 datasets to identify changes in Hispanic population health research from 1960 to 2019. They found an increase in studies including adult populations and measures of ethnic and racial identity, but noted gaps in data on children and youth, gender identity, and immigration status.
A 48-year record of Australian collecting trips has been made publicly available, providing accurate details on specimen collection dates and locations. The data is now accessible via the Zenodo open-data repository in Darwin Core format.
A mathematician's study on 'swarmalators' reveals new class of math problems, finding rich patterns in time and space through coupling of synchronization and swarming. This research opens doors for various parts of science, exploring new areas and possibilities.
Research suggests that increasing plant diversity can limit the nutrient supply for insect pests, reducing their populations. By introducing different genotypes of the same crop species with varying nutrient levels, farmers may be able to control insects while maintaining consistent production.
A new analysis of the BIODEPTH project reveals that complementary interactions between species play a stronger role in determining ecosystem productivity than previously thought. This finding suggests that conserving a variety of species is crucial for maintaining healthy ecosystems.