Pyrophyte

Last updated

Pyrophytes are plants which have adapted to tolerate fire.

Contents

Fire acts favourably for some species. "Passive pyrophytes" resist the effects of fire, particularly when it passes over quickly, and hence can out-compete less resistant plants, which are damaged. "Active pyrophytes" have a similar competing advantage to passive pyrophytes, but they also contain volatile oils and hence encourage the incidence of fires which are beneficial to them. "Pyrophile" plants are plants which require fire in order to complete their cycle of reproduction.

Passive pyrophytes

Sequoia sempervirens with remainings of a fire older than 100 years Charred.JPG
Sequoia sempervirens with remainings of a fire older than 100 years

These resist fire with adaptations including thick bark, tissue with high moisture content, or underground storage structures. Examples include:

For some species of pine, such as Aleppo pine (Pinus halepensis), European black pine (Pinus nigra) and lodgepole pine (Pinus contorta), the effects of fire can be antagonistic: if moderate, it helps pine cone bursting, seed dispersion and the cleaning of the underwoods; if intense, it destroys these resinous trees. [ citation needed ]

Active pyrophytes

Some trees and shrubs such as the Eucalyptus of Australia actually encourage the spread of fires by producing inflammable oils, and are dependent on their resistance to the fire which keeps other species of tree from invading their habitat.

Pyrophile plants

Other plants which need fire for their reproduction are called pyrophilic. Longleaf pine ( Pinus palustris ) is a pyrophile, depending on fire to clear the ground for seed germination. [4]

The passage of fire, by increasing temperature and releasing smoke, is necessary to raise seeds dormancy of pyrophile plants such as Cistus and Byblis an Australian passive carnivorous plant.

Imperata cylindrica is a plant of Papua New Guinea. Even green, it ignites easily and causes fires on the hills.

Evolution

99 million-year-old amber-preserved fossils of Phylica piloburmensis , belonging to the modern pyrophytic genus Phylica , show clear adaptations to fire including pubescent, needle-like leaves, further affirmed by the presence of burned plant remains from other Burmese amber specimens. These indicate that frequent fires have exerted an evolutionary pressure on flowering plants ever since their origins in the Cretaceous, and that adaptation to fire has been present in the family Rhamnaceae for over 99 million years. [5]

See also

Related Research Articles

<span class="mw-page-title-main">Pine</span> Genus of plants in the conifer family Pinaceae

A pine is any conifer tree or shrub in the genus Pinus of the family Pinaceae. Pinus is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts 187 species names of pines as current, together with more synonyms. The American Conifer Society (ACS) and the Royal Horticultural Society accept 121 species. Pines are commonly found in the Northern Hemisphere. Pine may also refer to the lumber derived from pine trees; it is one of the more extensively used types of lumber. The pine family is the largest conifer family and there are currently 818 named cultivars recognized by the ACS.

<span class="mw-page-title-main">Droseraceae</span> Family of carnivorous flowering plants

Droseraceae is a family of carnivorous flowering plants, also known as the sundew family. It consists of approximately 180 species in three extant genera. Representatives of the Droseraceae are found on all continents except Antarctica.

<span class="mw-page-title-main">Venus flytrap</span> Species of carnivorous plant

The Venus flytrap is a carnivorous plant native to subtropical wetlands on the East Coast of the United States in North Carolina and South Carolina. It catches its prey—chiefly insects and arachnids—with a trapping structure formed by the terminal portion of each of the plant's leaves, which is triggered by tiny hairs on their inner surfaces.

<span class="mw-page-title-main">Longleaf pine</span> Species of plant (tree)

The longleaf pine is a pine species native to the Southeastern United States, found along the coastal plain from East Texas to southern Virginia, extending into northern and central Florida. In this area it is also known as "yellow pine" or "long leaf yellow pine", although it is properly just one out of a number of species termed yellow pine. It reaches a height of 30–35 m (98–115 ft) and a diameter of 0.7 m (28 in). In the past, before extensive logging, they reportedly grew to 47 m (154 ft) with a diameter of 1.2 m (47 in). The tree is a cultural symbol of the Southern United States, being the official state tree of Alabama. Contrary to popular belief, this particular species of pine is not officially the state tree of North Carolina.

<i>Pinus elliottii</i> Species of conifer tree

Pinus elliottii, commonly known as slash pine, is a conifer tree native to the Southeastern United States. Slash pine is named after the "slashes" – swampy ground overgrown with trees and bushes – that constitute its habitat. Other common names include swamp pine, yellow slash pine, and southern Florida pine. Slash pine has two different varieties: P. e. var. elliottii and P. e. var. densa. Historically, slash pine has been an important economic timber for naval stores, turpentine, and resin. The wood of slash pine is known for its unusually high strength, especially for a pine. It exceeds many hardwoods and is even comparable to very dense woods such as ironwood.

<i>Pinus virginiana</i> Species of conifer

Pinus virginiana, the Virginia pine, scrub pine, Jersey pine, Possum pine, is a medium-sized tree, often found on poorer soils from Long Island in southern New York south through the Appalachian Mountains to western Tennessee and Alabama. The usual size range for this pine is 9–18 m, but can grow larger under optimum conditions. The trunk can be as large as 20 inches diameter. This tree prefers well-drained loam or clay, but will also grow on very poor, sandy soil, where it remains small and stunted. The typical life span is 65 to 90 years.

<span class="mw-page-title-main">Flatwoods</span> An ecological community in the southeastern coastal plain of North America

Flatwoods, pineywoods, pine savannas and longleaf pine-wiregrass ecosystem are terms that refer to an ecological community in the southeastern coastal plain of North America. Flatwoods are an ecosystem maintained by wildfire or prescribed fire and are dominated by longleaf pine, and slash pine in the tree canopy and saw palmetto, gallberry and other flammable evergreen shrubs in the understory, along with a high diversity of herb species. It was once one of the dominant ecosystem types of southeastern North America. Although grasses and pines are characteristic of this system, the precise composition changes from west to east, that is, from Texas to Florida. In Louisiana, savannas even differ between the east and west side of the Mississippi River. The key factor maintaining this habitat type is recurring fire. Without fire, the habitat is eventually invaded by other species of woody plants.

<i>Drosera regia</i> Species of carnivorous plant in the family Droseraceaea endemic to a single valley in South Africa

Drosera regia, commonly known as the king sundew, is a carnivorous plant in the sundew genus Drosera that is endemic to a single valley in South Africa. The genus name Drosera comes from the Greek word droseros, meaning "dew-covered". The specific epithet regia is derived from the Latin for "royal", a reference to the "striking appearance" of the species. Individual leaves can reach 70 cm (28 in) in length. It has many unusual relict characteristics not found in most other Drosera species, including woody rhizomes, operculate pollen, and the lack of circinate vernation in scape growth. All of these factors, combined with molecular data from phylogenetic analysis, contribute to the evidence that D. regia possesses some of the most ancient characteristics within the genus. Some of these are shared with the related Venus flytrap (Dionaea muscipula), which suggests a close evolutionary relationship.

<span class="mw-page-title-main">Serotiny</span> Seed release in response to environment

Serotiny in botany simply means 'following' or 'later'.

<span class="mw-page-title-main">Pocosin</span> Kind of wetland of the Atlantic plain

A pocosin is a type of palustrine wetland with deep, acidic, sandy, peat soils. Groundwater saturates the soil except during brief seasonal dry spells and during prolonged droughts. Pocosin soils are nutrient-deficient (oligotrophic), especially in phosphorus.

<span class="mw-page-title-main">Florida scrub</span> Temperate coniferous forests ecoregion of Florida, United States

Florida sand pine scrub is an endangered subtropical forest ecoregion found throughout Florida in the United States. It is found on coastal and inland sand ridges and is characterized by an evergreen xeromorphic plant community dominated by shrubs and dwarf oaks. Because the low-nutrient sandy soils do not retain moisture, the ecosystem is effectively an arid one. Wildfires infrequently occur in the Florida scrub. Most of the annual rainfall falls in summer. It is endangered by residential, commercial and agricultural development, with the largest remaining block in and around the Ocala National Forest. Lake Wales Ridge National Wildlife Refuge also holds a high proportion of remaining scrub habitat, while the Archbold Biological Station near Lake Placid contains about 20 km2 (7.7 sq mi) of scrub habitat and sponsors biological research on it.

<i>Conradina glabra</i> Species of flowering plant

Conradina glabra is a rare species of shrub known by the common name Apalachicola rosemary. It is endemic to Liberty County, Florida, where it is known from about ten populations. It is found only in a small area and it is threatened by habitat destruction. It is a federally listed endangered species.

<i>Pinguicula ionantha</i> Species of carnivorous plant

Pinguicula ionantha is a rare species of flowering plant in the butterwort family known by the common names Godfrey's butterwort and violet butterwort. It is endemic to the US state of Florida, where it only occurs in the central Florida Panhandle. It is threatened by the loss of its habitat, and it is a federally listed threatened species of the United States.

<span class="mw-page-title-main">Sweetbay Bogs Preserve</span> Preserve established in 1989 by the Mississippi Chapter of the Nature Conservancy

Sweetbay Bogs Preserve was established in 1989 by the Mississippi Chapter of the Nature Conservancy. Located in the western portion of Stone County, Mississippi, the property contains a classic example of a hillside seepage bog which the Conservancy designated as Sweetbay Bogs Preserve because of the multitude of sweetbay trees that occupy the site. The Preserve contains 194 acres near Red Creek, within the Pascagoula River watershed.

<i>Schizachyrium tenerum</i> Species of plant

Schizachyrium tenerum is a species of grass known by the common name slender little bluestem, or slender bluestem. It is native to the Americas, where it occurs in North, Central, and South America. In North America it can be found in the southeastern United States and much of Mexico.

<i>Quercus incana</i> Species of oak tree

Quercus incana is a species of oak known by the common names bluejack oak, upland willow oak, sandjack oak, and cinnamon oak. It is native to the Atlantic and Gulf coastal plains of the United States, from Virginia around Florida to Texas and inland to Oklahoma and Arkansas.

<span class="mw-page-title-main">Southeastern conifer forests</span> Temperate coniferous forests ecoregion of the United States

The Southeastern conifer forests are a temperate coniferous forest ecoregion of the southeastern United States. It is the largest conifer forest ecoregion east of the Mississippi River. It is also the southernmost instance of temperate coniferous forest within the Nearctic realm.

The East Gulf coastal plain savanna and wet prairie is a herbaceous wetland community found in the eastern Gulf coastal plain, in the states of Mississippi, Alabama, and Georgia. It is also known as a "lush grassland", "grass-sedge savannah", or "wet savanna".

<span class="mw-page-title-main">Palustris Experimental Forest</span>

Palustris Experimental Forest is an experimental forest operated by the Southern Research Station (SRS) of the United States Forest Service in Rapides Parish, Louisiana. It is located south of Alexandria, Louisiana within the Kisatchie National Forest. The experimental forest bears the name of the predominant pine species that covered this region before the virgin pine forests were harvested in the early 1900s.

References

  1. Boyer, W. D. (1990). "Pinus palustris". In Burns, Russell M.; Honkala, Barbara H. (eds.). Conifers. Silvics of North America. Washington, D.C.: United States Forest Service (USFS), United States Department of Agriculture (USDA). Vol. 1 via Southern Research Station.
  2. W. Schulze; E.D. Schulze; I. Schulze & R. Oren (2001). "Quantification of insect nitrogen utilization by the venus fly trap Dionaea muscipula catching prey with highly variable isotope signatures". Journal of Experimental Botany. 52 (358): 1041–1049. doi: 10.1093/jexbot/52.358.1041 . PMID   11432920.
  3. Leege, Lissa (19 August 2002). "How does the Venus flytrap digest flies?". Scientific American. Retrieved 2008-08-20.
  4. Jose, Shibu; Jokela, Eric J.; Miller, Deborah L. (2006), Jose, Shibu; Jokela, Eric J.; Miller, Deborah L. (eds.), "The Longleaf Pine Ecosystem", The Longleaf Pine Ecosystem: Ecology, Silviculture, and Restoration, New York, NY: Springer, pp. 3–8, doi:10.1007/978-0-387-30687-2_1, ISBN   978-0-387-30687-2 , retrieved 2022-10-24
  5. Shi, Chao; Wang, Shuo; Cai, Hao-hong; Zhang, Hong-rui; Long, Xiao-xuan; Tihelka, Erik; Song, Wei-cai; Feng, Qi; Jiang, Ri-xin; Cai, Chen-yang; Lombard, Natasha; Li, Xiong; Yuan, Ji; Zhu, Jian-ping; Yang, Hui-yu (February 2022). "Fire-prone Rhamnaceae with South African affinities in Cretaceous Myanmar amber". Nature Plants. 8 (2): 125–135. doi:10.1038/s41477-021-01091-w. ISSN   2055-0278.