A revitalized forest may present as tall, dense, and verdant, while rejuvenated wetlands can teem with buzzing insects and fluttering birds. However, researchers have uncovered that some of the tiniest inhabitants, such as specific mosses, lichens, algae, and fungi, often remain absent in these restored habitats.
The restoration of ecosystems like forests and wetlands can aid in preserving declining species of animals and plants, facilitating their population recovery. Nevertheless, recent studies indicate that not all species return at the same pace. Some of the least conspicuous inhabitants may stay scarce or missing for extended periods, potentially impacting other species.
Ellen Macdonald, a botanist from the University of Alberta, has dedicated her career to studying forests, focusing not on the trees but on the minute flowers, mosses, liverworts, and lichens that thrive in their shadows, among their roots, or on their bark’s textured surfaces.
Macdonald emphasized the abundant diversity of these smaller species compared to tree species. While a regrown forest post-logging might appear similar to an untouched one to the average observer, Macdonald noted a subtle unbalance in regrown coniferous boreal forests during her walks.
Her comprehensive research, coupled with global data, scrutinized the duration required for plants and animals to reestablish as boreal forests recover following clearcutting. The findings, recently published in the journal Nature Sustainability, revealed that birch and aspen forests and their inhabitants rejuvenate within 25 years. In contrast, conifer forests necessitate significantly longer periods for recovery. Understory plants, particularly lichens, mosses, and liverworts, take 85 years or more to reappear in conifer forests, with some species still missing even after a century.
This phenomenon is not exclusive to boreal forests. Researchers studying restored wetlands and other habitats have also observed the persistence of absent less visible species despite the overall apparent health of these ecosystems.
The gradual decline of species, described by Viktoria Wagner as “dark diversity,” indicates a silent loss where species vanish from numerous previously inhabited locations, reducing species richness at individual sites. This phenomenon can have far-reaching consequences on ecosystem dynamics, affecting other species negatively.
Understanding these recovery patterns can guide landscape managers on preserving more species. Macdonald’s research suggests that selective or partial harvesting of conifer forests may be more beneficial than clearcutting to conserve biodiversity.
Algae habitats, crucial for various species, face threats worldwide. Michael Melkonian’s efforts to collect and preserve algae strains highlight the importance of maintaining biodiversity across landscapes, emphasizing the need for active interventions to combat ongoing species loss.