Abstract
Urban environments have the potential to support a healthy bat community
if suitable resources are readily available for a diversity of species.
For example, bats can use water sources in urban areas, such as drainage
ditches and ponds. However, when these sources are not available or have
limited distribution, bats may utilize an alternative source;
residential swimming pools. Thus, if such pools could be made more
accessible, this may improve urban habitats for bats. Over three years,
we conducted behavioral observation and acoustic surveys at 20 pools in
suburban Fort Worth, Texas to determine whether pool treatment, shape,
lighting, and size influenced bat activity. Using night vision, thermal
cameras, and acoustic detectors, we recorded bat activity over the
pools. Our results revealed that residential swimming pools can provide
at least two resources for bats; drinking and foraging. Yet access and
potential availability are dependent on the pool characteristics and the
importance of characteristics depended on the type of activity being
exhibited. For example, while pool shape affected drinking behavior with
more bats drinking at straight-edged pools as opposed to curved-edged
pools, it had no impact on foraging. Water treatment types also
influenced activity: mineral- and salt-treated pools supported higher
drinking and foraging activity compared to chlorine-treated pools.
Artificial lighting at pools deterred both bat presence and resource use
and lastly, pool size emerged as a key factor for species diversity,
with larger pools (>70 m2 in size) supporting more species
and activities. These findings emphasize the potential of urban swimming
pools as resources for bats and provide practical guidance for designing
bat-friendly water sources in residential areas.