Temperature and water potential effects on the growth,
transpiration, total nonstructural carbohydrate (TNC) content, and
nutrient uptake of sudangrass (Sorghum vulgare var. piper) were
investigated in laboratory experiments. The effect of nitrogen supply
on the growth and nutrient uptake at constant soil water potential was
also investigated in this study....
The effects of soil temperature and soil water suction on the
uptake of calcium, magnesium, and potassium by wheat (Triticum
aestivum VILL., Host) were studied. Companion studies on uptake of
nitrogen and phosphorus provided background for discussion of the
results. Plants were grown in perlite slabs separated from an
osmotic...
This research assesses prescribed burning as a habitat management
technique in wetlands and associated upland communities of Malheur
National Wildlife Refuge, southeastern Oregon. Experimental burns
were conducted to evaluate fire behavior and effects in wetland and
upland habitats, and, fire effects on Cirsium arvense. Wetland plant
communities were monotypic stands...
Ecological niche models can be a useful tool to identify candidate reintroduction sites for endangered
species but have been infrequently used for this purpose. In this paper, we (1) develop activity-specific
ecological niche models (nesting, roosting, and feeding) for the critically endangered California condor
(Gymnogyps californianus) to aid in reintroduction...
Ecological niche models can be a useful tool to identify candidate reintroduction sites for endangered
species but have been infrequently used for this purpose. In this paper, we (1) develop activity-specific
ecological niche models (nesting, roosting, and feeding) for the critically endangered California condor
(Gymnogyps californianus) to aid in reintroduction...
Full Text:
95971,
USA.
Jesse D’Elia a,b,⇑, Susan M. Haig c, Matthew Johnson c,1, Bruce G. Marcot d, RichardYoung
Ecological niche models can be a useful tool to identify candidate reintroduction sites for endangered species but have been infrequently used for this purpose. In this paper, we (1) develop activity-specific ecological niche models (nesting, roosting, and feeding) for the critically endangered California condor (Gymnogyps californianus) to aid in reintroduction...
Recent activity in the exploration and development of the ocean's
resources has created a need for scientific and technical knowledge in
many areas. One example is the need for rapid and reliable techniques
for ascertaining and for the predictions of sea state and the atmospheric
conditions at particular ocean locations....
Managers reduce piñon (Pinus spp.) and juniper (Juniperus spp.) trees that are encroaching on sagebrush (Artemisia spp.)
communities to lower fuel loads and increase cover of desirable understory species. All plant species in these communities
depend on soil water held at >-1.5 MPa matric potential in the upper 0.3 m...
Piñon (Pinus spp.) and juniper (Juniperus spp.) trees are reduced to restore native vegetation and avoid severe fires where they have expanded into sagebrush (Artemisia tridentata Nutt.) communities. However, what phase of tree infilling should treatments target to retain desirable understory cover and avoid weed dominance? Prescribed fire and tree...
We hypothesized that changes in southeastern Bering Sea foraging conditions for black-legged kittiwakes (Rissa tridactyla)
have caused shifts in habitat use with direct implications for population trends. To test this, we compared at-sea
distribution, breeding performance, and nutritional stress of kittiwakes in three years (2008–2010) at two sites in the...
Full Text:
. Young7, Kelly Benoit-Bird8, Carol Ladd9, Heather Renner10,
Scott Heppell1, Richard A. Phillips11