Not exact matches
While overall
habitat loss is a factor in these declines, research also indicates that even fields
of sufficient size, if they are
fragmented or interrupted by hedgerows or natural windbreaks, will be passed over by the birds, which may view the linear plantings as cover for predators.
The authors examine the concept and importance
of maintaining connectivity (ability
of wildlife populations to move among landscapes between
habitat «islands» such as mountain tops, forest
fragments and isolated wetlands) and corridor ecology.
The tropical forests
of the Amazon, for example, were being
fragmented by logging and burning, resulting in a patchwork
of good and bad
habitat.
The consequences
of cougar overcrowding in
fragmented habitat are painfully clear just 300 miles south
of the Santa Cruz population, where biologists struggle to save about 12 mountain lions in the Santa Monica Mountains above LA.
The
habitat that remains is indeed more
fragmented, mostly because
of road construction.
Roads also
fragment and isolate turtle
habitats by establishing a barrier to migration and the movement
of individuals.
The sites — including locations in the Crane Naval Surface and Warfare Center, Big Oaks National Wildlife Refuge, and state parks — varied in
habitat size and form, ranging from small to large forest
fragments with varying degrees
of tree cover.
That meant they missed important changes in
habitat suitability and how much
of the
habitat, however good, is
fragmented.
«Panda
habitat shrinking, becoming more
fragmented: Modern GIS technologies could improve our assessment
of the species» extinction risks.»
«What our results then mean is that if we keep splitting natural
habitats into smaller and smaller pieces, we may not only lose a lot
of species from the resultant
fragments, but also change the structure and functioning
of local food webs.»
Restoring the connections between
habitats that have been
fragmented by human actions — instead
of just focusing on maximizing total
habitat area — is key if we want to give these butterflies a fighting chance, Oliver says.
If that climate scenario is combined with
habitat restoration efforts, particularly those aimed at connecting
habitats that have been
fragmented by human activity, the average population has a much higher probability
of survival — about 50 %.
The report identified over 40 key actions needed to boost gibbon numbers and ensure their long - term survival, including enhancing monitoring systems to keep track
of remaining individuals, creating canopy bridges between forest
fragments to expand their
habitat range, and limiting disturbance by people in forested areas.
«Our study finds that many species have much smaller remaining ranges than is widely assumed and that most
of their remaining
habitat is highly
fragmented,» they say.
Ensure that industry, mining, infrastructure, and rural development programs and projects are fully sensitive to the conservation needs
of snow leopards and their ecosystems, do not adversely affect or
fragment key populations or critical
habitats, and employ wildlife - friendly design, offsets, and other mitigation tools.
On islands and in
fragmented urban and suburban
habitats unnaturally high densities
of cats are not only capable
of reducing or eradicating populations
of birds and small mammals, they can out - compete native predators like foxes and weasels.
«To thrive in these [
fragmented]
habitats birds must have special adaptations such as the ability to respond to frequent nest predation and parasitism and to forage on a wide variety
of seasonally available foods.
We are biologically homogenising the biosphere, overharvesting certain species and functional guilds, altering a range
of biogeochemical cycles,
fragmenting vast landscapes down to local ecological communities, and saturating the planet's surface in a number
of synthetic compounds: the slash and burn approach to global
habitat management.
According to Stott, the project would have
fragmented «the combined contiguous
habitats of the Huai Kha Khaeng Wildlife Sanctuary, the Thung Yai Wildlife Sanctuary, the Kroeng Kavia Non-Hunting Area, and the undisturbed forest across the border in Burma possibly comprise the finest remaining conservation area in the whole
of mainland Asia.»
As pockets
of forest
habitat are isolated, their edges are exposed to harsher, brighter, drier conditions and plant and animal dispersal between
habitat fragments is made more difficult; in addition,
habitat fragments may be too small to sustain populations
of some species.
In the Scenic Hudson study, Dr. Michael Klemens demonstrated that the original proposal's 951 widely - spaced units would be «ecologically damaging» and would cause widespread harm to important
habitat and wildlife species by permanently
fragmenting of over 2,200 acres
of rich Hudson Valley open space.
Projected range shifts
of mammal species will be limited by
fragmented habitats and human pressures, as suggested in the TAR, with declines in species richness likely, especially in protected areas.
These nests tend to be constructed more often within a
fragmented deciduous forest than any other type
of habitat (Jessop et al, 2004).
The International Union for Conservation
of Nature notes that their numbers have dropped by nearly two - thirds since the early 1970s thanks to plantation agriculture that has destroyed and
fragmented their forest
habitat.
The
habitat in the Qinling Mountains is seriously
fragmented and the population density is very high... the brown pandas could be an indication
of local inbreeding.
While the
habitat of the woolly mammoth is widely different from what it was thousands
of years ago —
fragmented by roads and cities, for instance — the
habitat of the northern white rhino still exists.
That's mostly because
of people, who
fragmented the condor's
habitat, strung up powerlines for the condors to run into, and poisoned the birds through poisoned bait, as well as carcasses contaminated with lead ammunition.