Current mass extinction spurs major study of which species to save

Washington, Oct 22 : The Earth is in the midst of the sixth mass extinction of both plants and animals, which has spurred a study by biologists at UC (University of California) Santa Barbara, to determine which species must be saved.

"The current extinction event is due to human activity, paving the planet, creating pollution, many of the things that we are doing today," said co-author Bradley J. Cardinale, assistant professor of ecology, evolution and marine biology (EEMB) at UC Santa Barbara.

"The Earth might well lose half of its species in our lifetime. We want to know which ones deserve the highest priority for conservation," he added.

According to the current study, the most genetically unique species are the ones that have the greatest importance in an ecosystem. These are the ones that the scientists recommend be listed as top priority for conservation.

"Given that we are losing species from ecosystems around the world, we need to know which species matter the most -- and which we should pour our resources into protecting," said first author Marc W. Cadotte, postdoctoral fellow at UCSB's National Center for Ecological Analysis and Synthesis (NCEAS).

Cadotte, Cardinale, and co-author Todd Oakley, an EEMB associate professor, put together a "meta-analysis" of approximately 40 important studies of grassland ecosystems around the world.

They reconstructed the evolutionary history among 177 flowering plants used in these studies by comparing the genetic makeup of the plants.

The scientists found that some species are more critical than others in preserving the functions of ecosystems and that these species tend to be those that are genetically unique.

Therefore, they are looking to evolutionary history for guidance in conservation efforts and in understanding the potential impacts of species loss.

As the biomass of plants plummets around the globe, the composition of gasses in the atmosphere that support life could be profoundly affected.

Additionally, there are fewer plants for herbivorous animals to eat. Entire food chains can be disrupted, which can impact the production of crops and fisheries.

The loss of species that are not closely related to other species in the ecosystem reduces productivity more than the loss of species with close relatives.

The more genetically distinct a species is, the more impact it has on the amount of biomass in an ecosystem.

"Losing a very unique species may be worse than losing one with a close relative in the community," said Oakley.

According to Cadotte, "These 40 studies are showing the same thing for all plants around the world. It is not a willy-nilly conclusion. This study is very robust. It includes studies of plants that are found throughout the U.S., Europe, and Asia."

ANI