Fire

Fires may be the result of natural phenomena such as lightning or they may be man-induced. Usually natural fires are an integral part of plant community development and influence such things as soil nutrient availability and biological diversity. In contrast, uncontrolled or wildfires disrupt such processes and can have a catastrophic impacts. The vast majority of wildfires are intentionally set and often occur in conifer forests. In recent years extended droughts, together with the rapidly expanding exploitation of tropical forests and the demand for the conversion of forests to other land uses, have resulted in a dramatic increase in wildfires. While some conifers have evolved to be fire dependent by having serotinous cones that open and release their seed in response to fire, their populations are so small or fragmented that even natural fires may be catastrophic. This is particularly evident in areas with a Mediterranean climate. It is the introduction of inappropriate fire regimes (frequency, severity, or seasonal timing) that can have the most severe impact.

Taxa in the category - Fire:

Page 10 of 12 pages ‹ First  < 8 9 10 11 12 > 
 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus maximartinezii Rzed.

Endemic to two locations in northern Mexico where the main threats are grazing by livestock and fire Read full species entry >

 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus nelsonii Shaw

Occurs in the southern part of the Sierra Madre Oriental of Mexico, its main threats are cattle grazing and fire Read full species entry >

 world map

blob indicating Eastern and southeastern USA	 on map

Pinus palustris Mill.

Distributed in the Atlantic and Gulf Coastal Plains of southeastern USA where extreme levels of logging have dramatically reduced the population size Read full species entry >

 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus radiata D.Don

Distributed on the Pacific coast of California and on two islands off the coast of Mexico, it is threatened by feral goats on the islands and by an introduced pathogen, and competition from other trees in the absence of periodic fires on the mainland Read full species entry >

 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus radiata var. binata (Engelm.) Lemmon

Endemic to two small islands off the coast of Baja California, Mexico: the main threats are pitch canker, impacts of possibly frequent fires, climate change, and introduced species Read full species entry >

 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus radiata var. radiata

Endemic to central-coastal California, USA where the three remaining stands are mainly threatened by fire, pitch canker and urbanisation. Read full species entry >

 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus rzedowskii Madrigal & Caball. Del.

Endemic to western Michoacan, Mexico where it is threatened by fire Read full species entry >

 world map

blob indicating China on map

Pinus squamata X.W. Li

One of the world's rarest pines, confined to a single locality in Yunnan, China with only about 20 mature individuals. Read full species entry >

Page 10 of 12 pages ‹ First  < 8 9 10 11 12 >