A rejuvenated forest may appear tall, dense, and verdant, while restored wetlands can teem with insects and fluttering birds. However, researchers have discovered that some of the smallest inhabitants, such as specific mosses, lichens, algae, and fungi, are often absent even after habitat restoration efforts.
Rebuilding ecosystems like forests and wetlands can aid in the recovery of declining animal and plant species. Nonetheless, recent studies indicate that not all species return at the same pace. Certain inconspicuous inhabitants may remain scarce or missing for decades, potentially impacting other species.
Ellen Macdonald, a botanist from the University of Alberta, has dedicated her career to studying forests, focusing on the minute flowers, mosses, liverworts, and lichens that thrive in the forest understory. Macdonald emphasized the abundant diversity of these species compared to tree species.
While an average person might perceive a regrown forest as similar to an untouched one, Macdonald observed discrepancies in regrown coniferous boreal forests that hinted at missing elements requiring data collection to discern.
Macdonald’s research, combined with global data, investigated the recovery timeline of plants and animals in boreal forests post-clearcutting. The study, recently published in the journal Nature Sustainability, revealed that birch and aspen forests recovered within 25 years, whereas conifer forests took significantly longer. In conifer forests, understory plants, notably lichens, mosses, and liverworts, took 85 years or more to reestablish, with some species still absent after a century.
The challenge of missing species extends beyond boreal forests. Scientists studying restored habitats like wetlands have encountered a similar scenario, where some less visible species remain absent despite the apparent health of the ecosystem.
The decline of species, described as “dark diversity” by researcher Viktoria Wagner, signifies a silent loss where species vanish from numerous locations, reducing overall biodiversity. Restoring landscapes is complex and not always successful, as species may struggle to return once locally extinct.
The absence of species can impede ecosystem recovery and have far-reaching consequences. Algae, despite their small size, play a crucial role in global photosynthesis and ecosystem functioning. Declining diversity can disrupt ecosystem balance and negatively impact other species.
Understanding these patterns can guide landscape managers on preserving more species. Selectively harvesting conifer forests instead of clearcutting may help conserve biodiversity. Preserving habitats for algae and other species is crucial, emphasizing the need for active interventions to sustain biodiversity across landscapes.
Efforts to collect and preserve algae strains highlight the importance of maintaining living repositories of species. This approach ensures the conservation of diverse species and their habitats, emphasizing the continuous need for biodiversity preservation and restoration.
