Author: Sanuli Wijayasundara
Date: October 3, 2025
Area of Impact:
Atlantic Canada
Article Information and Location:
https://canadiangeographic.ca/articles/wildlife-wednesday
Sarah Brown, Canadian Geographic, November 8, 2023
INTRODUCTION
Wildlife is revealing the impacts of climate change and environmental pollution. Researchers studying the American pika, a small mountain-dwelling rodent known as an indicator species in B.C. and Alberta, are using its poop to analyze eDNA, offering insights into the species’ decline and the broader effects of climate change. Meanwhile, orcas are facing health risks due to toxic “forever chemicals” in their diet, with certain populations more affected based on their prey choices. The article also touches on southern bird species encroaching on northern territories and the unwanted arrival of invasive red swamp crayfish in Nova Scotia.
INFORMATION AND SIGNIFICANCE
Researchers in B.C. and Alberta are studying the American pika for climate change. By analyzing eDNA from pika poop, scientists aim to understand the factors behind the species’ decline and how rapid environmental changes are affecting ecosystems. This non-invasive approach helps researchers monitor the pika’s genetic health and food web relationships, with the hopes of aiding their survival in changing climates.
In the ocean, orcas are facing health threats from persistent organic pollutants (POPs), as mentioned in a study (Jensen et al., 1969). A recent study shows that orcas consuming marine mammals, which have higher fat content, are exposed to higher levels of these toxins compared to those eating fish. These chemicals disrupt orca reproductive and immune systems, underscoring the urgent need for stricter chemical disposal and conservation measures to protect these apex predators.
The article also highlights how climate change is reshaping wildlife dynamics, with southern bird species moving into northern regions, and invasive red swamp crayfish emerging as an ecological threat in Nova Scotia. These shifts in species populations reflect the broader challenges of environmental change and biodiversity loss in response to rising temperatures and human activity.
CONCLUSION
The challenges faced by species like pikas, orcas, and birds reflect the growing impact of climate change and pollution on our planet’s ecosystems. These shifts in wildlife behaviour and health are stark reminders of the urgent need for action. By supporting conservation efforts, reducing chemical waste, and advocating for policies that address environmental threats, we can help preserve the biodiversity that sustains us.
REFERENCES
Jensen, S., Johnels, A. G., Olsson, M., & Otterlind, G. (1969). DDT and PCB in marine animals from Swedish waters. Nature, 224(5216), 247-250.
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