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Pioneer species

From Wikipedia, the free encyclopedia

Centaurea maculosa, an example of pioneer species
Centaurea maculosa, an example of pioneer species

Pioneer species are hardy species which are the first to colonize previously biodiverse steady-state ecosystems.[1] Some lichens grow on rocks without soil, so may be among the first of life forms, and break down the rocks into soil for plants.[2] Since some uncolonized land may have thin, poor quality soils with few nutrients, pioneer species are often hardy plants with adaptations such as long roots, root nodes containing nitrogen-fixing bacteria, and leaves that employ transpiration. Note that they are often photosynthetic plants, as no other source of energy (such as other species) except light energy is often available in the early stages of succession, thus making it less likely for a pioneer species to be non-photosynthetic. The plants that are often pioneer species also tend to be wind-pollinated rather than insect-pollinated, as insects are unlikely to be present in the usually barren conditions in which pioneer species grow; however, pioneer species tend to reproduce asexually altogether, as the extreme or barren conditions present make it more favourable to reproduce asexually in order to increase reproductive success rather than invest energy into sexual reproduction. Pioneer species will die creating plant litter, and break down as "leaf mold" after some time, making new soil for secondary succession (see below), and nutrients for small fish and aquatic plants in adjacent bodies of water.[3]

Pioneer species of plant growing in cracks on a solidified recently erupted lava flow in Hawaii
Pioneer species of plant growing in cracks on a solidified recently erupted lava flow in Hawaii

Examples of the plants and organism that colonize such areas are pioneer species:

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  • Pioneer species-Stages Primary Succession | Ecology Basics|
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Transcription

Welcome to MooMooMath and Science In this video, I would like to talk about pioneer species and primary succession In 1980 Mount Saint Helens erupted and dust was lifted 15 miles into the atmosphere and drifted over 11 states. The area around the volcano was destroyed and lifeless. However, if you looked closely on the exposed rock you would find bacteria, some fungal, and possibly pollen. A new community of life would begin to grow on this exposed rock. This process of establishing a community in an area like a rock without soil is called primary succession. Before most plants can grow they need soil. How is this soil created? Many times lichens and moss will begin to grow on the rock. Because they are the first living things to appear and grow they are called the pioneer species. A lichen is an interesting individual and is a combination of algae or bacteria that lives among fungi Lichen can grow on almost any surface and do not need soil to grow. Moss is a nonvascular plant that can that does not need soil to grow. Therefore it can grow on rocks much like the lichen. Because lichen is part fungi they release acids that break down rocks. As the pioneer species, they begin to decay and leave behind the organic material. This organic material along with the rock sediment soil slowly begins to appear. As the soil appears small weedy plants like ferns may begin to grow. As these plants grow other individuals like fungi and insects will appear and as they die more soil is produced. All of this growth is a result of the first pioneer species which are the first individuals to grow on places like rocks that do not have soil. Thanks for watching Please subscribe and share

Contents

Pioneer fauna

Pioneering fauna will colonize an area only after flora and fungi have inhabited the area. Soil fauna, ranging from microscopic protists to larger invertebrates, have a role in soil formation and nutrient cycling. Bacteria and fungi are the most important groups in the breakdown of organic detritus left by primary producing plants such as skeletal soil, moss and algae. Soil invertebrates enhance fungal activity by breaking down detritus. As soil develops, earthworms and ants alter soil characteristics. Worm burrows aerate soil and ant hills alter sediment particle size dispersal, altering soil character profoundly.

Though vertebrates in general would not be considered pioneer species, there are exceptions. Natterjack toads are specialists in open, sparsely vegetated habitats which may be at an early seral stage.[6] Wide-ranging generalists visit early succession stage habitats, but are not obligate species of those habitats because they use a mosaic of different habitats.

Vertebrates can effect early seral stages. Herbivores may alter plant growth. Fossorial mammals could alter soil and plant community development. In a profound example, a seabird colony transfers considerable nitrogen into infertile soils, thereby altering plant growth. A keystone species may facilitate the introduction of pioneer species by creating new niches. For example, beavers may flood an area, allowing new species to immigrate.[7]

Secondary succession and pioneer species

Pioneer species can also be found in secondary succession, such as an established ecosystem being reduced by an event such as: a forest fire, deforestation, or clearing; quickly colonizing open spaces which previously supported vegetation.[8]

Common examples of the plants in such areas include:[citation needed]

See also

References

  1. ^ Duram, Leslie A. (2010). Encyclopedia of Organic, Sustainable, and Local Food. ABC-CLIO. p. 48. ISBN 9780313359637. 
  2. ^ LICHEN BIOLOGY AND THE ENVIRONMENT, LICHENS OF NORTH AMERICA, Sylvia and Stephen Sharnoff, [1]
  3. ^ Walker, Lawrence R.; Moral, Roger del (2003-02-13). Primary Succession and Ecosystem Rehabilitation. Cambridge University Press. ISBN 9780521529549. 
  4. ^ Amazing Lava Products and Forms, U.S. National Park Service. Retrieved 2015-06-16.
  5. ^ http://www.surtsey.is/pp_ens/biola_3.htm
  6. ^ Faucher, Leslie; Hénocq, Laura; Vanappelghem, Cédric; Rondel, Stéphanie; Quevillart, Robin; Gallina, Sophie; Godé, Cécile; Jaquiéry, Julie; Arnaud, Jean-François (2017-09-01). "When new human-modified habitats favour the expansion of an amphibian pioneer species: Evolutionary history of the natterjack toad (Bufo calamita) in a coal basin". Molecular Ecology. 26 (17): 4434–4451. doi:10.1111/mec.14229. ISSN 1365-294X. 
  7. ^ Wallwork, John Anthony (1970). Ecology of Soil Animals. McGraw-Hill. ISBN 0070941254. 
  8. ^ E.,, Ricklefs, Robert. Ecology : the economy of nature. Relyea, Rick,, Richter, Christoph F.,, Revision of: Ricklefs, Robert E. (Seventh edition, Canadian ed.). New York, NY. ISBN 9781464154249. OCLC 961903099. 
  9. ^ Knox, Kirsten J. E.; Morrison, David A. (2005-06-01). "Effects of inter-fire intervals on the reproductive output of resprouters and obligate seeders in the Proteaceae". Austral Ecology. 30 (4): 407–413. doi:10.1111/j.1442-9993.2005.01482.x. ISSN 1442-9993. 
This page was last edited on 21 September 2018, at 12:38
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