Rare Species of Animals and Plants Organize in Ghettos to Survive

Coral Reef Tropical Fish

Among the ecological communities studied are corals.

An international research team in which Spanish experts participate has shown that sparse species are associated spatially in 90% of the animal and plant communities studied.

“Animal and plant communities are organized in a similar way to cities, ghettos or ethnic neighborhoods,” the researchers say. “This organization could be behind the persistence of rare species since they could avoid the competitive pressure of the most abundant species, either because they cooperate with each other or because they prefer specific microhabitats or both at the same time,” they point out.

The results of this research, published in Nature Ecology & Evolution on December 16, 2019, suggest a general explanation for the maintenance of biodiversity in competitive environments, clarifying the principle of competitive exclusion whereby species with the lowest competitive abilities should be excluded by more efficient competitors. “This pattern could explain how species that compete for the same resources are able to coexist,” biologists say.

Spanish institutions participating in this study are the National Museum of Natural Sciences and the Doñana Biological Station (both of the CSIC), the University of Alcalá, the Complutense University of Madrid, the Rey Juan Carlos University, the Autonomous University of Madrid, the University of Castilla-La Mancha, the University of the Basque Country.

From conservation to the study of diseases

To carry out the study, more than three hundred worldwide ecological communities of mosses, herbs, trees, insects, arachnids and corals, among others, have been analyzed.

The researchers explain that they used the network theory to detect ghettos or groups, while they applied numerical simulations to study the mechanisms that gave rise to them. The results of these simulations confirm that the grouping between sparse species is necessary to explain the coexistence patterns observed all around the world.

These findings may have profound implications for the understanding of the formation of ecological communities. Among their applications, experts highlight conservation planning or even the study of human diseases related to the intestinal microbiome, “where the coexistence of species is essential.”

“However, the specific interactions and mechanisms that allow associations of rare species are still unknown, which should also boost a new research agenda in various fields of life sciences,” researchers acknowledge.

Reference: “Positive associations among rare species and their persistence in ecological assemblages” by Joaquín Calatayud, Enrique Andivia, Adrián Escudero, Carlos J. Melián, Rubén Bernardo-Madrid, Markus Stoffel, Cristina Aponte, Nagore G. Medina, Rafael Molina-Venegas, Xavier Arnan, Martin Rosvall, Magnus Neuman, Jorge Ari Noriega, Fernanda Alves-Martins, Isabel Draper, Arantzazu Luzuriaga, Juan Antonio Ballesteros-Cánovas, César Morales-Molino, Pablo Ferrandis, Asier Herrero, Luciano Pataro, Leandro Juen, Alex Cea and Jaime Madrigal-González, 16 December 2019, Nature Ecology & Evolution.
DOI: 10.1038/s41559-019-1053-5

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