Some unpaved roads are closed
Recent rains have caused extensive damage to the Lavender Canyon road, Colorado Overlook road, and the Salt/Horse road. The White Rim Road is impassable from Hardscrabble camp to Upheaval Bottom. Roads will be closed until repairs can be made. More »
Extreme Fire Danger
Due to extremely dry conditions, fire restrictions are in effect in all national park units in Utah. More »
New backcountry requirements in effect
Hard-sided bear containers are required for backpackers in parts of the Needles District. More »
There is a great deal of exposed rock in Canyonlands, and much of it is covered by lichens. Lichens usually colonize north-facing surfaces since reduced solar radiation is an advantage for many organisms in the desert. Lichens also grow on healthy, mature cryptobiotic soil crust, and occasionally on live or dead plant material. Many species of lichen are found in Canyonlands.
A lichen is actually a simple community of at least two organisms, namely fungi with green algae or cyanobacteria, though sometimes with both. The lichen structure is more elaborate and durable than either fungi or algae alone. Green algae and cyanobacteria manufacture food via photosynthesis, while fungi provide a buffer against weather and are capable of extracting nutrients from soil and rock.
Lichens are well adapted to arid climates. They can carry on food production at any temperature above 32º Fahrenheit. Lichens can absorb more than their own weight of water, and can absorb temporary water like dew almost directly into their algal cells (the water does not need to go through roots and stems as it does in vascular plants).
Many plants benefit from the presence of lichens. The cyanobacterial component of lichens can transform atmospheric nitrogen (unusable to most organisms) into a form that is an essential nutrient for life. This is especially important in desert ecosystems, where lack of nitrogen is known to limit productivity.
Did You Know?
The common raven displays abilities to play and problem-solve rare among animals. This member of the crow family is also very vocal, using a variety of sounds for communication. Perhaps because of these qualities, ravens have achieved a certain stature in both European and Native American folklore. More...