1. Types
    Allogenic engineers  Autogenic engineers 

2. Importance

3. Introduced species as ecosystem engineers

4. Humans as ecosystem engineers

5. Examples
    Terrestrial environments  Marine environments 

6. See also

7. References
     Bibliography  

8. External links

An ecosystem engineer is any organism that creates, significantly modifies, maintains or destroys a habitat. These organisms can have a large impact on the species richness and landscape-level heterogeneity of an area.^[1] As a result, ecosystem engineers are important for maintaining the health and stability of the environment they are living in. Since all organisms impact the environment they live in in one way or another, it has been proposed that the term "ecosystem engineers" be used only for keystone species whose behavior very strongly affects other organisms.^[2]

Types

Jones et al.^[3] identified two different types of ecosystem engineers:

Allogenic engineers

Allogenic engineers modify the biophysical environment by mechanically changing living or nonliving materials from one form to another. Beavers are the original model for ecosystem engineers; in the process of clearcutting and damming, beavers alter their ecosystem extensively. The addition of a dam will change both the distribution and the abundance of many organisms in the area.^[2] Caterpillars are another example in that by creating shelters from leaves, they are also creating shelters for other organisms which may occupy them either simultaneously or subsequently.^[4] An additional example may be that of woodpeckers or other birds who create holes in trees for them to nest in. Once these birds are through with them, the holes are used by other species of birds or mammals for housing.^[2]

Autogenic engineers

Autogenic engineers modify the environment by modifying themselves. Trees are a good example, because as they grow, their trunks and branches create habitats for other living things; these may include squirrels, birds or insects among others. In the tropics, lianas connect trees, which allow many animals to travel exclusively through the forest canopy.^[5]

Importance

Being able to identify ecosystem engineers in an environment can be important when looking at the influence these individuals may have over other organisms living in the same environment – especially in terms of resource availability.^[6]

The presence of some ecosystem engineers has been linked to higher species richness at the landscape level. By modifying the habitat, organisms like the beaver create more habitat heterogeneity and so can support species not found elsewhere.^[1] Thoughts may be that similar to other umbrella species by conserving an ecosystem engineer you may be able to protect the overall diversity of a landscape.^[1] Beavers have also been shown to maintain habitats in such a way as to protect the rare Saint Francis' satyr butterfly and increase plant diversity.^[7]

Introduced species as ecosystem engineers

Species are able to be transported across all parts of the world by humans or human-made vessels at boundless rates resulting in foreign ecosystem engineers changing the dynamics of species interactions and the possibility for engineering to occur in locations that would not have been accessible by engineers without the mediation by humans.

Introduced species, which may be invasive species, are often ecosystem engineers. Kudzu, a leguminous plant introduced to the southeast U.S., changes the distribution and number of animal and bird species in the areas it invades. It also crowds out native plant species. The zebra mussel is an ecosystem engineer in North America. By providing refuge from predators, it encourages the growth of freshwater invertebrates through increasing microhabitats. Light penetration into infected lakes also improves the ecosystem, resulting in an increase in algae. In contrast to the benefits some ecosystem engineers can cause, invasive species often have the reverse effect.

Humans as ecosystem engineers

Humans are thought to be one of the most dramatic ecosystem engineers. Niche construction has been prevalent since the earliest days of human activity.^[9] Through urban development, agricultural practices, logging, damming and mining, humans have changed the way they interact with the environment.

This interaction is more studied in the field of human ecology.

Due to the complexity of many communities and ecosystems, restoration projects are often difficult. Ecosystem engineers have been proposed as a means to restore a given area to its previous state. While ideally these would all be natural agents, with today's level of development some form of human intervention may be necessary as well. In addition to being able to assist in restoration ecology, ecosystem engineers may be a helpful agent in invasive species management.^[10] New fields are developing which focus on restoring those ecosystems which have been disrupted or destroyed by human activities as well as developing ecosystems that are sustainable with both human and ecological values.^[11]

Examples

Terrestrial environments

Besides the previously mentioned beaver acting as an ecosystem engineer, other terrestrial animals do the same. This may be through feeding habits, migration patterns or other behaviors that result in more permanent changes.

Research has suggested primates as ecosystem engineers as a result of their feeding strategies – frugivory and folivory – making them act as seed dispersers.^[6] As a whole primates are very abundant and feed on a large quantity of fruit that is then distributed around their territory. Elephants have also been designated ecosystem engineers as they cause very large changes to their environment whether it be through feeding, digging or migratory behavior.^[12]

Not only animals are ecosystem engineers. Fungi are able to connect regions that are distant from one another and translocate nutrients between them.^[13] Doing so they create nutritional niches for xylophagous invertebrates,^[14][15] supply trees with N translocated from previously predated animals^[16] or even form an "underground pipeline" that redistributes carbon between trees.^[17] Thus fungi are engineers controlling nutrient cycles in ecosystems.

Marine environments

In marine environments, filter feeders and plankton are ecosystem engineers because they alter turbidity and light penetration, controlling the depth at which photosynthesis can occur.^[19] This in turn limits the primary productivity of benthic and pelagic habitats^[20] and influences consumption patterns between trophic groups.^[21]

Another example of ecosystem engineers in marine environments would be scleractinian corals as they create the framework for the habitat most coral-reef organisms depend on.^[22] Some ecosystem engineers such as coral have help maintaining their environment. Parrotfish often help maintain coral reefs as they feed on macroalgae that competes with the coral.^[23] As this relationship is mutually beneficial, a positive feedback cycle is formed between the two organisms, making them both responsible for creating and maintaining coral reef ecosystems.^[23]

See also

• Niche construction
• Structures built by animals
• Nest-building in primates

References

Bibliography

• {{cite journal | last1 = Buse | first1 = J | last2 = Ranius | first2 = T | last3 = Assmann | first3 = T | year = 2008 | title = An endangered longhorn beetle associated with old oaks and its possible role as an ecosystem engineer | url = | journal = Conservation Biology | volume = 22 | issue = 2| pages = 329–337 | doi=10.1111/j.1523-1739.2007.00880.x| pmid = 18261146 }}
• {{cite journal | last1 = Crawford | first1 = KM | last2 = Crutsinger | first2 = GM | last3 = Sander | first3 = NJ | year = 2007 | title = Host-plant genotypic diversity mediates the distribution of an ecosystem engineer | url = http://trace.tennessee.edu/cgi/viewcontent.cgi?article=1949&context=utk_chanhonoproj | journal = Ecology | volume = 88 | issue = 8| pages = 2114–2120 | doi=10.1890/06-1441.1}}
• {{cite journal | last1 = Commito | first1 = J. A. | last2 = Celano | first2 = E. A. | last3 = Celico | first3 = H. J. | last4 = Como | first4 = S. | last5 = Johnson | first5 = C. P. | year = 2005 | title = Mussels matter: postlarval dispersal dynamics altered by a spatially complex ecosystem engineer | url = http://www.sciencedirect.com/science/article/pii/S0022098104006136 | journal = Journal of Experimental Marine Biology and Ecology | volume = 316 | issue = 2| pages = 133–147 | doi=10.1016/j.jembe.2004.10.010}}
• {{cite journal | last1 = Wright | first1 = JP | last2 = Jones | first2 = CG | year = 2006 | title = The concept of organisms as ecosystem engineers ten years on: progress, limitations, and challenges | url = https://www.researchgate.net/publication/202001805 | journal = BioScience | volume = 56 | issue = 3| pages = 203–209 | doi=10.1641/0006-3568(2006)056[0203:tcooae]2.0.co;2}}

External links

• [https://www.youtube.com/watch?v=zS2EBvtnMdA A lecture by Moshe Shachak, the developer of the concept of ecosystem engineers (together with CG. Jones and JH. Lawton) during the 90's.]

• Eugenia plumbea
• Eugenia polypora
• Eugenia porphyrantha
• Eugenia praestigiosa
• Eugenia prasina
• Eugenia pseudoclaviflora
• Eugenia pustulescens
• Eugenia pycnoneura
• Eugenia quadrata
• Eugenia Randolph
• Eugenia Randolph Lord
• Eugenia rendlei
• Eugenia rheophytica
• Eugenia rhomboidea
• Eugenia rivulorum
• Eugenia rostadonis
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• Eugenia rotundata
• Eugenia rufo-fulva
• Eugenia sachetae
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• Eugenia salamensis
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• Eugenia schunkei