Long Point Bird Observatory, situated on a 40-kilometre sandspit near Lake Erie in southwestern Ontario, is a UNESCO Biosphere Reserve and the oldest continuously operating bird sanctuary in North America. Recent research from the Proceedings of the National Academy of Sciences reveals concerning effects of climate change on the wildlife at Long Point.
The study, conducted by researchers from the University of Michigan and Birds Canada using data from Long Point Bird Observatory, indicates a decline in tree swallow populations. Since 1969, tree swallows have been laying fewer eggs and reducing in body size. Aerial insectivores, like tree swallows, have decreased by 43%, while insect numbers have plummeted by over 60% since 1977.
Lead author Charlotte Probst, a PhD student at the University of Michigan, highlighted the impact of climate change on the timing of events. Insects are emerging earlier due to warmer temperatures, causing a mismatch with the birds’ breeding and migration cycles. This phenological mismatch is a significant consequence of climate change, affecting the availability of food for tree swallows.
Matthew Fuirst, a research ecologist at Birds Canada, noted that years with low insect abundance led to smaller and fewer eggs in tree swallows. The study revealed that the timing mismatch has been increasing by more than three days per decade since 1977, emphasizing the widening gap between bird behavior and insect availability.
Insect biomass researcher Hadil Elsayed from York University found that rising temperatures are causing insects to emerge earlier. The reduction in insect populations, observed across various species, is attributed to changes in vegetation and climate. To mitigate the impact locally, experts recommend planting native wildflowers, reducing pesticide use, and creating habitats for insects to support the ecosystem.
The interconnectedness of species underscores the importance of addressing insect decline to ensure the well-being of tree swallows and the broader food chain at Long Point Bird Observatory.