In biogeography, a native species is indigenous to a given region or ecosystem if its presence in that region is the result of only local natural evolution (though often popularised as "with no human intervention"). The term is equivalent to the concept of indigenous or autochthonous species. Every wild organism (as opposed to a domesticated organism) is known as an introduced species within the regions where it was anthropogenically introduced. If an introduced species causes substantial ecological, environmental, and/or economic damage, it may be regarded more specifically as an invasive species.
The notion of nativity is often a blurred concept, as it is a function of both time and political boundaries. Over long periods of time, local conditions and migratory patterns are constantly changing as tectonic plates move, join, and split. Natural climate change (which is much slower than human-caused climate change) changes sea level, ice cover, temperature, and rainfall, driving direct changes in habitability and indirect changes through the presence of predators, competitors, food sources, and even oxygen levels. Species do naturally appear, reproduce, and endure, or become extinct, and their distribution is rarely static or confined to a particular geographic location.
A native species in a location is not necessarily also endemic to that location. Endemic species are exclusively found in a particular place. A native species may occur in areas other than the one under consideration. The terms endemic and native also do not imply that an organism necessarily first originated or evolved where it is currently found.
Native species form communities and biological interactions with other specific flora, fauna, fungi, and other organisms. For example, some plant species can only reproduce with a continued mutualistic interaction with a certain animal pollinator, and the pollinating animal may also be dependent on that plant species for a food source. Many species have adapted to very limited, unusual, or harsh conditions, such as cold climates or frequent wildfires. Others can live in diverse areas or adapt well to different surroundings.
Human impact and intervention
The diversity of species across many parts of the world exists only because bioregions are separated by barriers, particularly large rivers, seas, oceans, mountains, and deserts. Humans can introduce species that have never met in their evolutionary history, on varying time scales ranging from days to decades (Long, 1981; Vermeij, 1991). Humans are moving species across the globe at an unprecedented rate. Those working to address invasive species view this as an increased risk to native species.
As humans introduce species to new locations for cultivation, or transport them by accident, some of them may become invasive species, damaging native communities. Invasive species can have profound effects on ecosystems by changing ecosystem structure, function, species abundance, and community composition. Besides ecological damage, these species can also damage agriculture, infrastructure, and cultural assets. Government agencies and environmental groups are directing increasing resources to addressing these species.
Conservation and advocacy
Native plant organizations such as the Society for Ecological Restoration, native plant societies, Wild Ones, and Lady Bird Johnson Wildflower Center encourage the use of native plants. The identification of local remnant natural areas provides a basis for this work.
Many books have been written on the subject of planting native plants in home gardens. The use of cultivars derived from native species is a widely disputed practice among native plant advocates.
Importance of nativity in conservation
When ecological restoration projects are undertaken to restore a native ecological system disturbed by economic development or other events, they may be historically inaccurate, incomplete, or pay little or no attention to ecotype accuracy or type conversions. They may fail to restore the original ecological system by overlooking the basics of remediation. Attention paid to the historical distribution of native species is a crucial first step to ensure the ecological integrity of the project. For example, to prevent erosion of the recontoured sand dunes at the western edge of the Los Angeles International Airport in 1975, landscapers stabilized the backdunes with a "natural" seed mix (Mattoni 1989a). Unfortunately, the seed mix was representative of coastal sage scrub, an exogenous plant community, instead of the native dune scrub community. As a result, the El Segundo blue butterfly (Euphilotes battoides allyni) became an endangered species. The El Segundo Blue butterfly population, which had once extended over 3200 acres along the coastal dunes from to Ocean Park to Malaga cove in Palos Verdes, began to recover when the invasive California buckwheat (Eriogonum fasciculatum) was uprooted so that the butterflies' original native plant host, the dune buckwheat (Eriogonum parvifolium), could regain some of its lost habitat.
- CEQ (1999)). Executive Order 13112
- "What are native plants?". University of Rhode Island. Retrieved 16 January 2019.
- "Autochthonous". Merriam-Webster Dictionary. Retrieved 16 January 2019.
- "Introduced species". Science Daily. Retrieved 26 December 2017.
- Levin, Phillip S; Poe, Melissa R. (2017). Conservation for the Anthropocene Ocean: Interdisciplinary Science in Support of Nature and People. Academic Press. ISBN 9780128092989.
- Aitken, Gill (2018). A New Approach to Conservation: The Importance of the Individual through Wildlife Rehabilitation. Routledge. ISBN 9781351163545.
- "Endemic". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- Indigenous, Aliens and Invasives Envirofacts
- Tallamy, Douglas W. (2007). Bringing Nature Home: How Native Plants Sustain Wildlife in Our Gardens. Timber Press. ISBN 978-0-88192-854-9.
- "Point Reyes National Seashore, Drakes Estero, A Sheltered Wilderness Estuary", National Park Service, United States Department of the Interior, p. 16.
- "Native Plant Societies". nanps.org. Retrieved 2018-09-23.
- "Lady Bird Johnson Wildflower Center". Wildflower.org. Retrieved 2012-07-09.
- Stein, Sara (1993). Noah's Garden: Restoring the Ecology of Our Own Back Yards. Houghton-Mifflin. ISBN 9780395709405.
- Wasowski, Andy and Sally (2000). The Landscaping Revolution: Garden With Mother Nature, Not Against Her. Contemporary Books. ISBN 9780809226658.
- Tallamy, Douglas W. (2020). Nature's Best Hope: A New Approach to Conservation That Starts in Your Yard. Timber Press. ISBN 978-1604699005.
- ""Nativars" Courtesy of Watermarkwoods.com". Archived from the original on 2016-03-04. Retrieved 2014-07-09.
- Travis Longcore, Rudi Mattoni, Gordon Pratt, and Catherine Rich, "On the perils of ecological restoration and the El Segundo blue butterfly", in press, for 2nd Interface Between Ecology and Land Development in California. Occidental College, April 18-19, 1997 Online.
- "Black, S. H., and D. M. Vaughan, "Species profile: Euphilotes battoides allyni, El Segundo Blue", Red List of Pollinator Insects of North America. CD - ROM Version 1 (May 2005). Portland, OR: The Xerces Society for Invertebrate Conservation. (2005)" (PDF). Archived from the original (PDF) on 2016-03-03. Retrieved 2013-09-29.
- ""California's butterflies: The El Segundo Blue", Quino Checkerspot Captive Breeding Program, Vista Murrieta High School. O line". Archived from the original on 2013-10-02. Retrieved 2013-09-29.