Thank you, Mr. Chair.
I'm a registered professional biologist in British Columbia, and currently employed as the marine conservation specialist for the David Suzuki Foundation. Prior to joining the David Suzuki Foundation, I spent 10 years as a research scientist studying temperate marine and coastal ecosystems.
I'm here today to provide a science-based perspective on two issues which I believe are fundamental to the committee's study of the ecosystem impacts and management of pinniped populations.
Firstly, I would like to address the belief that there is an overpopulation of pinnipeds on our coasts as the motion for this study asserts. This belief is generally based on the steep growth experienced by many pinniped populations in the second half of the 20th century. However, to fully understand the current status of pinniped populations, we must look beyond the narrow snapshot of steep growth often presented by proponents of pinniped culls.
In the middle of the last century, many pinniped populations were severely depleted as a result of decades of commercial harvesting and predator control programs. In the Pacific, for example, harbour seals have been reduced to 10% of their historical abundance. The steep growth seen after the species received protection is therefore not the sign a population explosion but rather a population recovering from over-exploitation. Since their successful recovery, most pinniped populations have been stable at or near historical levels with very little change in the last few decades.
Populations that have been stable for decades at or near historical levels are clearly not exhibiting signs of overpopulation. It is worth noting that the numbers of pinnipeds we are seeing today have coexisted with healthy and abundant fish stocks in the past.
The second issue I would like to speak to is the notion that simply because pinnipeds consume a certain volume of the fish stock, reducing the number of pinnipeds would benefit that stock. Marine food webs are far too complex for such a simplistic approach to work. On the west coast, for example, a pinniped cull is being proposed to restore Pacific salmon populations. However, the most recent diet data from the Salish Sea shows that harbour seals prey on 57 different species. Each of these 57 species represents a pathway for the unintended consequences from a pinniped cull to ripple through the food web with potentially devastating impacts on the ecosystem and the very fish stocks we are trying to restore.
One of those possible unintended consequences is an increase in the Pacific hake population. Pacific hake are the most common prey item for harbour seals in the Salish Sea, making up 24% of their diet on average, compared to 3.5% for chinook and 2.2% for sockeye. We know that Pacific hake prey on juvenile salmon, which means that a pinniped cull could actually lead to an increase and not a reduction in the mortality of Pacific salmon.
While my examples focus on the west coast, the underlying drivers, which are the inherent complexity of temperate marine food webs and the generalist feeding habits of pinnipeds, apply elsewhere. This is why comprehensive reviews of culling programs from ecosystems across the world have found that unintended consequences for the target species and the wider ecosystem are commonly observed.
A cull of pinnipeds to benefit commercially valuable fish stocks is therefore a gamble with the health of coastal ecosystems of epic proportions, and with questionable prospects of achieving the desired outcome. The unpredictability and riskiness of this gamble is compounded by the significant and rapid changes we are already seeing in coastal ecosystems as a result of climate change. These changes are not only affecting the survival and recovery of commercial fish stocks, like salmon or cod, but are also having an impact on pinniped populations from the reduction of sea ice, intensification of disease outbreaks and decreases in prey availability.
Pinnipeds aren't only impacted by climate change. They also play an important role in climate change mitigation. A study published just last month in a leading scientific journal showed that protecting and restoring wild animal populations, including pinnipeds, can significantly enhance the natural carbon capture and storage capacity of ecosystems.
The best way to safeguard Canada's fishery for future generations in the face of climate change is therefore to maintain healthy, diverse and resilient ecosystems. The culling of pinnipeds with unpredictable outcomes would be counterproductive to this goal.
Thank you very much for your time, and I look forward to answering any questions.
I am happy to provide you with any of the source materials I have cited in my opening statement.