Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 12.
  1. Library Resource
    Articles et Livres
    décembre, 2013
    Amérique septentrionale

    The National Park Service (NPS) and other land management agencies have interest in managing bison herds under “natural” conditions; yet demographic features of natural populations are not well described. One solution to this issue involves the analysis of historical bison (Bison spp.) jump data. We conducted a literature search of archeological data associated with bison jump sites in North America with the goal of analyzing the data and summarizing historical bison demographics. We identified six locations with adequate information to conduct vertical life-table analyses.

  2. Library Resource
    Articles et Livres
    décembre, 2014

    Bromus tectorum is expanding across western North America. This spread is due to its own competitive abilities, land management practices, and unintended transport by the public as the plant's spikelets often lodge in clothing. Many assume that washing in a laundry machine makes the seeds nonviable: we decided to test this assumption. We hypothesized that seeds would exhibit lower rates of germination and emergence after being laundered, and the effect would be stronger if bleach was used.

  3. Library Resource
    Articles et Livres
    décembre, 2015

    As species' geographic ranges and ecosystem functions are altered in response to climate change, there is a need to integrate biodiversity conservation approaches that promote natural adaptation into land use planning. Successful conservation will need to embrace multiple climate adaptation approaches, but to date they have not been conveyed in an integrated way to help support immediate conservation planning and action in the face of inherent spatial uncertainty about future conditions.

  4. Library Resource
    Articles et Livres
    décembre, 2016

    Land management practices, invasive species expansion, and changes in the fire regime greatly impact the distribution of native plants in natural areas. Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), a keystone species in the Great Basin, has seen a 50% reduction in its distribution. For many dryland species, reestablishment efforts have focused on direct seeding but achieved only minor success due to irregular seed germination and poor survival.

  5. Library Resource
    Articles et Livres
    décembre, 2013
    États-Unis d'Amérique

    The Florida Scrub ecosystem depends on fire to sustain ecosystem function and to support resident plant and animal species. A recent study addressed the relationship between the time since last fire (TSF) and resident amphibians and reptiles in rosemary bald, one Florida Scrub habitat type. This is a parallel study in another Florida Scrub habitat type, scrubby flatwoods, at Archbold Biological Station (ABS), Lake Placid, Florida, USA. We installed 36 400-m² enclosures (four burn units within each of three TSF categories X 3 replicates per burn unit) at ABS.

  6. Library Resource
    Articles et Livres
    décembre, 2014
    États-Unis d'Amérique, Global

    The relationship between landscape pattern and the distribution and spread of exotic species is an important determinant of where and when management actions are best applied. We have developed an interdisciplinary approach for prioritizing treatment of harmful, nonnative, invasive plants in National Park landscapes of the Mid-Atlantic USA.

  7. Library Resource
    Articles et Livres
    décembre, 2013

    Astragalus microcymbus (Fabaceae) is a rare forb endemic to Gunnison County, Colorado. For 17 years, Denver Botanic Gardens and the U.S. Bureau of Land Management (Colorado State Office) have monitored four populations of this candidate species under the ESA in the South Beaver Creek Natural Area. Large, statistically significant population declines have been documented, as have prolonged dormancy, episodic fruit production, and herbivory.

  8. Library Resource
    Articles et Livres
    décembre, 2014

    We review Miami-Dade County's Environmentally Endangered Lands (EEL) Covenant Program as a means to create protected areas on private property via financial incentives. Such incentives go a step beyond regulatory and fee simple approaches to conservation. The program is codified under Chapter 25B, Article II, of the Miami-Dade County Code as authorized by section 193.501, Florida Statutes.

  9. Library Resource
    Articles et Livres
    décembre, 2015
    États-Unis d'Amérique

    Botanical capacity plays a fundamental role in solving the grand challenges of the next century, including climate change, sustainability, food security, preservation of ecosystem services, conservation of threatened species, and control of invasive species. Yet critical components of botanical education, research, and management are lacking across government, academic, and private sectors.

  10. Library Resource
    Articles et Livres
    décembre, 2015
    États-Unis d'Amérique

    Seeds of Success (SOS) is a national native seed collection program, led by the US Department of Interior Bureau of Land Management in partnership with numerous federal agencies and nonfederal organizations. The mission of the SOS is to collect wildland native seed for long-term germplasm conservation and for use in seed research, development of native plant materials, and ecosystem restoration. Each year about 50 SOS teams are stationed across the United States to make seed collections following a single technical protocol.

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