With over 1,400 species globally, bats represent an exceptionally diverse mammalian group, many of which in Central Europe historically rely on dense deciduous forests rich in hollow trees for shelter and roosting. The Leisler’s bat embodies this dependence, typically nesting in tree cavities created by natural decay or woodpecker activity. However, intensification of forest management has given rise to monocultural plantations dominated by conifers such as pines and spruces—habitats poorly suited for these bats. This shift has placed immense pressure on their customary roosting sites, undermining population resilience.

Groundbreaking research led by the Leibniz Institute for Zoo and Wildlife Research adopted state-of-the-art GPS telemetry to track 32 adult Leisler’s bats in Germany’s Brandenburg region. This pioneering approach provided an unprecedented window into their daily movements and habitat preferences. The GPS-generated data allowed researchers to cross-reference the bats’ precise foraging and roosting locations with detailed landscape maps, including forest tree species compositions and small-scale habitat features such as hedgerows and copses.

The results unequivocally demonstrate a preference for structurally rich oak forests, revealing these habitats as critical for both roosting and foraging. In contrast, spruce-dominated coniferous forests were significantly avoided. Oak trees’ highly heterogeneous structure, characterized by abundant cavities and fissures, provides crucial shelter particularly for maternity colonies and daytime roosting. This ecological specificity corroborates why the loss of such habitats severely threatens the species.

Of particular concern is the bats’ increasing colonization of urban and suburban green spaces. The data indicate that Leisler’s bats frequently occupy old hollow trees in residential areas and historic buildings such as churches, effectively adapting to anthropogenic landscapes. This shift likely arises from a scarcity of suitable tree cavities in intensively managed forests, forcing bats to exploit alternative refuges. Urban green spaces thus serve a vital conservation role, offering critical roosting habitats when natural forests fall short.

The expansion of urban roosting underscores the broader implications of intensive forestry practices that favor fast-growing, economically valuable tree species over structurally complex deciduous woodlands. Modern forestry methods, which often involve the removal of old trees and deadwood, inadvertently reduce habitat complexity essential to forest-dependent species. Consequently, ecological degradation is compounded, leaving bats vulnerable to a cascade of threats.

Sustainable forestry practices emerge as a pivotal strategy to mitigate habitat loss for the Leisler’s bat. Experts advocate for management that retains old trees, promotes species and structural diversity, and prolongs forest growth periods prior to harvesting. Such interventions not only support biodiversity but can be balanced with timber production goals through careful planning and selective extraction. Additionally, urban planning must integrate conservation perspectives by protecting aging trees and historic structures that provide indispensable roosting opportunities.

Another formidable risk confronting Leisler’s bats is the increasing deployment of wind turbines, particularly within forested landscapes. Research suggests that these bats are attracted to turbines, possibly mistaking the tall structures for large trees suitable for roosting. This misperception leads to fatal collisions with turbine blades, imposing significant mortality risks. Understanding the movement ecology of this highly mobile species is crucial for informing the siting of wind energy infrastructure to minimize adverse effects.

Collaboration among ecologists, foresters, urban planners, and renewable energy stakeholders is essential to reconcile conservation with societal development. Integrating fine-scale movement data into landscape management plans enables evidence-based decisions that respect species’ ecological needs. For instance, avoiding turbine placement near key roosts or dense deciduous woodlands can substantially reduce bat fatalities.

The findings from Brandenburg offer a compelling case study illustrating how modern technology can inform species conservation in an era of rapid environmental change. By capturing detailed spatial behavior, the research transcends traditional habitat assessments, revealing nuanced patterns of habitat selection and highlighting the critical value of non-forest refuges. These insights emphasize that conserving forest specialists requires a broad landscape perspective, incorporating both natural and human-modified habitats.

As this research underscores, forests are not merely collections of trees but intricate ecosystems whose structural attributes critically influence biodiversity. For forest-dependent bats like Nyctalus leisleri, structural diversity equates to survival, dictating access to shelter, foraging resources, and safe migratory corridors. Recognizing and preserving this complexity amid economic and energetic pressures poses a pressing challenge for conservationists worldwide.

In summary, the persistent decline of old, hollow-bearing trees in managed forests and the proliferation of wind turbines within bat habitats threaten to undermine the viability of Leisler’s bat populations. However, the species’ adaptability to urban green spaces offers a hopeful avenue for mitigating habitat loss. By harmonizing sustainable forestry, urban conservation, and wildlife-sensitive renewable energy planning, it is possible to create a mosaic of habitats that support forest specialists despite anthropogenic transformations.

The research conducted by the Leibniz Institute and its collaborators thus provides a vital template for conserving forest-affiliated bat species across Europe. It calls for a paradigm shift in landscape management that embraces multi-faceted, data-driven approaches to ensure these enigmatic mammals continue to thrive amid evolving environmental and societal contexts.

Subject of Research: Animals

Article Title: Oak woodlands and urban green spaces: Landscape management for a forest-affiliated bat, the Leisler’s bat (Nyctalus leisleri)

News Publication Date: 26-May-2025

Web References: http://dx.doi.org/10.1016/j.jenvman.2025.125753

Image Credits: Photo by Carolin Scholz

Keywords: Leisler’s bat, Nyctalus leisleri, forest management, oak woodland, urban green spaces, bat telemetry, habitat conservation, sustainable forestry, wind turbine impacts, bat roosting behavior, biodiversity, wildlife management

The study focused on how the Wrinkle-lipped free-tailed bat not only covers extensive distances during its foraging expeditions, but also meticulously selects high altitudes that coincide with the flight patterns of planthoppers. This is of notable relevance; traditional pest control methods often fail to manage these flying insects at elevated altitudes. By leveraging their unique hunting adaptation, the bats address pest populations responsible for severe rice crop damage, which is crucial for food security in regions heavily reliant on rice cultivation.

Rice is a staple food for more than half of the world’s population, particularly in Southeast Asia where it forms the backbone of local economies and diets. Planthoppers, which can travel significant distances when wind conditions are favorable, present challenges during their mass migratory phases. This heightens the importance of studying the interactions between natural predators like the Wrinkle-lipped free-tailed bat and pest species, as it opens doors to more sustainable agricultural practices that rely on biological pest management rather than chemical pesticides.

Prof. Dr. Christian Voigt, head of the evolutionary ecology department at Leibniz-IZW, articulated the uniqueness of the Wrinkle-lipped free-tailed bat in his findings. "Mops plicatus is a specialized aerial hunter that excels in catching flying insects at open heights, above the dense vegetation that characterizes rice fields," he explains. His research, spanning multiple years, employed miniaturized GPS loggers attached to the bats to track their movements and foraging patterns in their natural habitats.

One of the most remarkable discoveries was the extensive foraging ranges exhibited by these bats, reaching up to 1,743 square kilometers—the size of an area nearly double that of Berlin. This finding specifically highlights the ecological adaptability of a species that only weighs 18 grams. Remarkably, some bats traveled beyond 200 kilometers from their roosting caves in just one night, spending hours aloft, often above 150 meters, and frequently surpassing the 1,600-meter mark.

The study highlighted the behavior of the bats during peak planthopper activity, a time when their hunting fills a critical ecological niche. By utilizing rice fields as primary hunting grounds, they not only enhance their foraging efficiency but also serve a vital role in controlling pest populations. The implications of this research reflect how natural predators can be aligned with agricultural needs, providing essential services that can stabilize production levels and support local economies.

Dr. Supawan Srilopan, a scientist from Prince of Songkla University and the paper’s first author, emphasized the ecological implications of the bats’ feeding preferences. “Our research sheds light on how the Wrinkle-lipped free-tailed bats select habitats, notably favoring rice fields even when these are farther from their caves compared to areas where other crops are grown. This preference likely derives from the abundant presence of planthopper insects in these fields,” she stated.

Highlighting the importance of habitat conservation, the researchers advocate for protective measures for the natural roosting sites of these bats. Despite the large populations of Mops plicatus, only a limited number of caves provide year-round habitation for them. Protecting these areas from disturbances caused by human activities, such as tourism, is crucial not only for the bats but also for the agricultural sectors that benefit from their presence.

The ecosystem services rendered by these bats extend beyond immediate geographical areas, influencing agricultural practices in distant regions, including China, Korea, and Japan. Therefore, the conservation of the Wrinkle-lipped free-tailed bat is critical for promoting sustainable rice production across Asia.

The researchers gathered their data from the Lopburi Province in central Thailand. Utilizing mist nets and hand nets allowed them to capture multiple adult specimens of the Wrinkle-lipped free-tailed bat for the study. The GPS devices they employed were designed to unobtrusively monitor the bats’ flight patterns and foraging behaviors, thus providing unprecedented insight into their hunting strategies.

The pressing need for ecology-driven approaches in agriculture is more evident than ever. As global populations expand and demand for food increases, the interaction between natural pest control via species like Mops plicatus and traditional agricultural practices can hold the key to a more resilient food supply chain.

In conclusion, the research highlighting the ecological significance of the Wrinkle-lipped free-tailed bats underscores the interconnectedness of species within ecosystems. The findings advocate for an enlightened perspective on wildlife conservation, suggesting that preserving such species not only benefits biodiversity but also supports agricultural sustainability and economic stability in heavily impacted regions.

Subject of Research: Animals
Article Title: Large and high-altitude foraging ranges suggests importance of Wrinkle-lipped free-tailed bats (Mops plicatus) for consuming dispersing pest insects
News Publication Date: 8-Feb-2025
Web References: DOI link
References: N/A
Image Credits: Photo by Christian Voigt/Leibniz-IZW

Keywords: Wrinkle-lipped free-tailed bats, Mops plicatus, ecological significance, altitude foraging, pest control, rice production, Southeast Asia, conservation, biodiversity, agricultural sustainability, GPS tracking, planthoppers.