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A new ecological approach to protect biodiversity

New ecological approach to protect biodiversity
Demonstration of the impact, process and response approach for a warming scenario. Focusing on the community processes of dispersal, speciation, selection and drift can provide mechanistic insights into how humans alter the dynamics of terrestrial and freshwater systems via effects on community structure and function. We demonstrate the utility of this approach for a hypothetical climate warming scenario in which terrestrial communities (red circle) are turning over towards more warm-adapted species (aka thermophilising) faster than freshwater communities (blue circle). Potential differences or similarities in the strength of each process among ecosystem types can then be examined to provide possible explanations for why responses may vary or not between terrestrial and freshwater habitats. In this hypothetical scenario, a pattern of slower community turnover in freshwater compared to terrestrial habitats may be explained by weaker warming impacts and greater effective dispersal limitation in freshwaters. Credit: Ecology Letters (2022). DOI: 10.1111/ele.14153

Four fundamental processes shaping biodiversity should be taken into account to explain why some ecosystems are more sensitive than others to human impacts such as climate change and habitat destruction. The knowledge gained from this approach can be used to protect biodiversity on land and in freshwaters, researchers conclude in a recent publication in the journal Ecology Letters. One of the authors is Ian McFadden from the University of Amsterdam.

For years, researchers have observed that ecological communities can respond differently to disturbances caused by humans, depending on whether these impacts occur on land versus in such as lakes, rivers and streams. For example, while species in some ecosystems are very sensitive to climate warming, others are less affected.

A group of researchers now propose a new integrative approach that links human impacts to a set of four key ecological processes in order to better understand the responses of biodiversity to these impacts now and into the future. This will provide further tools to help protect biodiversity and give ecosystems a chance to adapt to a changing world

Differences in response

Co-lead author and UvA-IBED postdoctoral researcher Ian McFadden carried out the study during a former appointment at WSL, the Swiss Federal Institute for Forest, Snow and Landscape Research, in a cooperation with colleagues from Eawag, the Swiss Federal Institute of Aquatic Science and Technology.

"According to the theory of , there are four fundamental processes that shape local community diversity: dispersal, speciation, species-level selection and ecological drift, which is random changes in births and deaths," says McFadden.

"Dispersal and speciation add , and selection and drift remove them from local areas. Understanding the role these processes play in blue and green ecosystems, and how such as or land use affect them will help us explain why these systems can respond so differently."

Freshwater vs. terrestrial species

One important process that shapes biodiversity in a place is dispersal: new species migrate in, and other species migrate out of a local community. In their study, the researchers conclude that terrestrial organisms are generally less dispersal-limited than freshwater organisms. If humans continue to build new barriers in where dispersal is already a greater challenge, for example hydroelectric power plants, freshwater communities will be even further limited in their ability to respond to environmental change.

Terrestrial species may be more exposed to climate warming and increasingly, they also lack shady, cool refuges such as forests due to land conversion. The integrative approach of the researchers therefore suggests that may be under greater pressure to adapt rapidly to higher temperatures. In extreme cases, this selection pressure could lead to the extinction of species.

McFadden says, "Overall, our approach aims to provide tools to terrestrial and freshwater ecologists, , conservationists, policymakers and land owners to understand how and why biodiversity is changing both on land in our lakes, rivers and streams."

More information: Ian R. McFadden et al, Linking human impacts to community processes in terrestrial and freshwater ecosystems, Ecology Letters (2022). DOI: 10.1111/ele.14153

Journal information: Ecology Letters

Citation: A new ecological approach to protect biodiversity (2023, January 18) retrieved 27 February 2024 from
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