Showing 20 articles starting at article 1221

< Previous 20 articles        Next 20 articles >

Categories: Environmental: Ecosystems, Paleontology: Early Mammals and Birds

Return to the site home page

     (via sciencedaily.com)     Original source 

Scientists have developed a method for the direct observation of fine roots, which control the uptake of nutrients and water by trees. This provides a valuable addition to the existing knowledge of carbon and nutrient cycling in the forest floor, leading to further understanding of the carbon cycle from the view point of initial carbon input into the soil and aiding forest management and soil conservation.

     (via sciencedaily.com) 

Narwhals are changing their migration patterns in response to pressure from changing Arctic climates, a new UBC report has found.

     (via sciencedaily.com) 

Piecing together the crushed skull of a fossil bird that lived alongside the dinosaurs helped researchers extrapolate what its brain would have looked like: big olfactory bulbs would have meant that this bird, the earliest known animal to eat fruit, had a better sense of smell than most modern birds. And the bones around its eye sockets revealed that it would have been better at seeing by day than at night.

     (via sciencedaily.com) 

Prescribed fire -- a tool increasingly used by forest managers and landowners to combat invasive species, improve wildlife habitat and restore ecosystem health -- also could play a role in reducing the abundance of ticks and the transmission of disease pathogens they carry, according to a team of scientists.

     (via sciencedaily.com)     Original source 

Researchers found thousands of seedlings growing after recent fires in Montana, especially at sites with cooler, damper conditions -- often found in the shade of the dead trees and upper canopy, as well as on the north side of mountains with higher elevations and more undergrowth. Researchers found fewer seedlings at sites with less shade and drier, hotter conditions.

     (via sciencedaily.com) 

Coral reef halos, also known as grazing halos or sand halos, are bands of bare, sandy seafloor that surround coral patch reefs. These features, clearly-visible from satellite imagery, may provide a window into reef health around the world, according to a recently published study.

     (via sciencedaily.com) 

A new study on early human migration shows that semi-arid and desert zones of Central Asia may have served as key areas for the dispersal of hominins into Eurasia during the Middle Pleistocene. Central Asia is positioned at a crossroads linking several zones important to hominin dispersal during this period, however much evidence from this region lacks context for dating and climate conditions, making it difficult to understand these dynamics.

     (via sciencedaily.com) 

Some of Asia's largest animals, including tigers and elephants, are defying 12,000 years of extinction trends by thriving alongside humans, a new study has revealed.

     (via sciencedaily.com) 

Scientists have puzzled over the origin of Namibia's fairy circles for nearly half a century. It boiled down to two main theories: either termites were responsible, or plants were somehow self-organizing. Now, researchers benefiting from two exceptionally good rainfall seasons in the Namib Desert, show that the grasses within the fairy circles died immediately after rainfall, but termite activity did not cause the bare patches. Instead, continuous soil-moisture measurements demonstrate that the grasses around the circles strongly depleted the water within the circles and thereby likely induced the death of the grasses inside the circles.

     (via sciencedaily.com) 

The Laramie chickensage is unusual among the hundreds of species of sagebrush, most of which are primarily pollinated by the wind.

     (via sciencedaily.com) 

Ancient trees -- those that are many hundreds, or even thousands, of years old -- play a vital role in biodiversity and ecosystem preservation by providing stability, strength, and protection to at-risk environments. A team of ecologists highlight the importance of preserving these monumental organisms and present a project initiative to ensure their protection and longevity.

     (via sciencedaily.com) 

Climate change is causing the Arctic Ocean's sea ice to melt away. When the polar ocean loses its cover of sea ice, carbon dioxide uptake increases disrupting the food web in the water according to a new study.

     (via sciencedaily.com) 

New research, offering a comprehensive analysis of Asian elephant movement and habitat preference, finds that elephants prefer habitats on the periphery of protected areas, rather than the areas themselves.

     (via sciencedaily.com) 

By the end of this century, permafrost in the rapidly warming Arctic will likely emit as much carbon dioxide and methane into the atmosphere as a large industrial nation, and potentially more than the U.S. has emitted since the start of the industrial revolution. A new study forecasts cumulative emissions from this 'country of permafrost' through 2100 under low, medium, and high warming scenarios.

     (via sciencedaily.com) 

A major new project will help benchmark biodiversity change in the Arctic Ocean and guide conservation efforts by identifying unique species and assessing their extinction risk.

     (via sciencedaily.com) 

Stumbling upon a new source of underwater caffeine was just an added bonus of a new study examining the impact of chemical compounds that corals release into the seawater.

     (via sciencedaily.com) 

A new study indicates previously unknown high altitude contests between two of America's most sensational mammals -- mountain goats and bighorn sheep -- over access to minerals previously unavailable due to the past presence of glaciers which, now, are vanishing due to global warming.

     (via sciencedaily.com)     Original source 

The strong winds and torrential rains that accompany a cyclone do tremendous damage to ecosystems, and this damage can make them more prone to future wildfires. As intense cyclones are projected to become more frequent worldwide, a team of researchers examines the links between cyclones and forest fires, how they fuel one another, and why we may see fires burning in unlikely places in the future.

     (via sciencedaily.com)     Original source 

A new study shows that losing a particular group of endangered animals -- those that eat fruit and help disperse the seeds of trees and other plants -- could severely disrupt seed-dispersal networks in the Atlantic Forest, a shrinking stretch of tropical forest and critical biodiversity hotspot on the coast of Brazil.

     (via sciencedaily.com) 

Current protected areas only poorly cover the places most relevant for conserving soil ecological values. To assess global hotspots for preserving soil ecological values, an international team of scientists measured different facets of soil biodiversity (local species richness and uniqueness) and ecosystem services (like water regulation or carbon storage). They found that these facets peaked in contrasting regions of the world. For instance, temperate ecosystems showed higher local soil biodiversity (species richness), while colder ecosystems were identified as hotspots of soil ecosystem services. In addition, the results suggest that tropical and arid ecosystems hold the most unique communities of soil organisms. Soil ecological values are often overlooked in nature conservation management and policy decisions; the new study demonstrates where efforts to protect them are needed most.