All articles tagged with #urban ecology
A newly identified spider species, Pikelinia floydmuraria, about 3–4 mm long, lives in urban wall crevices in southern Brazil and can capture prey up to six times its size, often near artificial lights that attract insects like mosquitoes and flies; described in Zoosystematics and Evolution, the discovery sheds light on the ecology of the Pikelinia genus, with DNA studies needed to clarify its evolutionary relationships.
A European, multi-country study across 37 bird species found urban birds take flight sooner when approached by women than by men, with men able to stand closer by about a meter. The exact cues driving this sex difference—such as scent, gait, or body shape—remain unknown, and researchers call for follow-up experiments to identify the responsible signals. The 2,701 observations suggest urban birds are sensitive to subtle human cues, with implications for urban ecology and how scientists study animal behavior in cities.
An international study of 37 urban bird species across five European countries found birds let male researchers approach about three feet closer before fleeing than female researchers, a robust sex-based difference in flight initiation distance across cities and species. Researchers ruled out obvious factors like hair length, body size, and height, and suggested possibilities such as subtle appearance cues or odor, but no definitive explanation yet. The finding is consistent but remains puzzling to scientists.
New research shows Paris has become quieter over the past decade thanks to measures like cyclist-friendly streets, automated noise cameras, and Bruitparif monitoring, reducing noise by about three decibels. However, great tits in Paris still sing at higher pitches than birds in nearby quiet forests, indicating that further noise reductions are needed before urban birds can revert to their natural songs. The study also notes that quieter periods, such as COVID-19 lockdowns, briefly allowed some birds to lower their pitch, illustrating the potential for change when cities become quieter.
In Gladsaxe near Copenhagen, Denmark replaced standard white LED streetlights with red LEDs along Frederiksborgvej to protect a nearby bat colony and reduce light pollution, balancing driver safety with wildlife. The project is part of a broader EU Lighting Metropolis program advancing greener urban lighting aligned with UNDP sustainable-city goals.
Hundreds of people participated in the first organized swim in the Chicago River in nearly 100 years, symbolizing the significant environmental improvements made over the past decades to clean up the river, which was once heavily polluted and considered untouchable. The event highlights the progress in restoring urban waterways and the ongoing efforts needed to maintain these ecological gains.
A study from the University of Georgia suggests that the invasive Joro spider is surprisingly tolerant of urban vibrations and noise, making it more successful in urban landscapes than most native spiders. The research found that the spiders near busy roads are somewhat less likely to attack simulated prey, but this doesn't seem to affect their body mass or health. The study indicates that the Joro spider's tolerance of urban vibrations and sounds is likely a factor in its exponential growth, but researchers assure that the spiders are rather timid.