Whales Could Face Greater Collision Risks from Altered Shipping Routes, Warn Scientists

Shift in Global Trade Routes Raises Concern for Marine Life

Whales could be harmed by diverted – Researchers have raised alarms about the growing threat to whales off the coast of South Africa’s south-western region, attributing the heightened danger to shifting maritime paths caused by ongoing conflicts in the Middle East. Since 2023, the rerouting of commercial vessels around the Cape of Good Hope has significantly increased, according to a report by the International Monetary Fund’s PortWatch. This change in shipping lanes, driven by tensions between the US and Iran, as well as the Houthi rebels’ seizure of a British ship near Yemen, has created new challenges for marine ecosystems.

Global Trade Disruptions Impact Whale Habitats

The surge in vessels navigating alternative routes has led to a doubling of traffic in the area. Specifically, 89 commercial ships passed through the region between March and April this year, compared to 44 in the same period in 2023, as highlighted by the AFP news agency. These vessels, transporting goods between Asia and Europe, now bypass the Middle East entirely, increasing their exposure to whale populations. Scientists argue that this shift has disrupted natural migration patterns, forcing whales into denser zones of human activity.

Scientific Analysis of Collision Risks

Professor Els Vermeulen, chief scientist at the University of Pretoria’s Whale Unit, and her research team have analyzed the overlap between whale distribution and shipping routes to assess collision risks. Their findings, presented to the International Whaling Commission, reveal that certain areas off the Western Cape are now more prone to incidents involving ships and whales. By mapping species-specific habitats against current maritime traffic, Vermeulen and her colleagues identified high-risk zones where encounters are most likely.

“We’ve examined the spatial models of various whale species and overlaid them with shipping routes to pinpoint potential collision hotspots,” Vermeulen explained to the BBC.

Hidden Mortality Threats to Whale Populations

One of the key challenges in measuring the impact of these collisions is the phenomenon known as “cryptic mortality.” Vermeulen noted that many incidents occur deep offshore, where whales may sink without being observed on the coast. This makes it difficult to estimate the true scale of the problem, as traditional methods of tracking whale deaths—such as beach strandings—often miss a significant portion of the casualties. The lack of comprehensive data complicates efforts to gauge the severity of the issue or implement targeted solutions.

“It’s challenging to quantify the number of whales struck because we don’t have sufficient real-time data,” Vermeulen emphasized. “Most collisions happen far from the shore, leaving us with only fragmented insights.”

Proposed Solutions to Mitigate Risks

Vermeulen and her team have suggested several measures to reduce the threat to whales. These include adjusting shipping routes to avoid high-density whale zones and implementing speed restrictions during critical periods, such as breeding or feeding seasons. However, she stressed that without more detailed data, it’s hard to finalize recommendations. The proposed changes would require collaboration between maritime operators and conservationists to balance economic needs with ecological preservation.

Need for Systematic Whale Population Surveys

According to Vermeulen, the next step involves conducting a thorough survey of offshore whale populations. The team plans to use aerial and maritime methods to gather more precise information about species distribution and migration trends. She highlighted that such efforts would provide the foundation for effective conservation strategies. “We need support to carry out this work,” she told the BBC. “The scientific community is now under pressure to deliver reliable data on these populations.”

Global Collaboration Crucial for Addressing the Crisis

Vermeulen’s remarks underscore the importance of international cooperation in tackling this issue. While the rerouting of ships is primarily a response to geopolitical tensions, the ecological consequences require a coordinated approach. She praised the willingness of stakeholders to collaborate, but warned that without sustained investment in research, the risk to whale populations could continue to rise. “The urgency is clear,” she said. “If we don’t act now, the impact on these animals may be irreversible.”

The findings highlight a broader trend in maritime activity affecting marine life. As global trade routes adapt to conflict zones, the pressure on whales and other sea creatures intensifies. Scientists are now calling for immediate action to monitor and mitigate these risks, ensuring that the marine environment remains protected even as shipping demands grow. The University of Pretoria’s Whale Unit is working closely with environmental agencies and the International Whaling Commission to develop a comprehensive plan, but the scale of the challenge demands more resources and attention.

Vermeulen’s team is also exploring the use of technology to enhance data collection. For example, satellite tracking and acoustic monitoring could provide real-time insights into whale movements and ship traffic. These tools would help identify patterns and predict collision risks with greater accuracy. However, the implementation of such systems requires funding and logistical support, which Vermeulen said is currently limited.

The increasing number of ships in the area has not only raised concerns for whales but also for other marine species. For instance, sea turtles and dolphins are also vulnerable to ship strikes, particularly in the same high-traffic zones. Vermeulen’s research aims to create a holistic view of these threats, allowing for more targeted interventions. “We need to understand the full picture before we can take decisive action,” she added.

Despite the challenges, Vermeulen remains optimistic about the potential for positive change. She pointed to recent initiatives, such as the adoption of slower speeds during certain times of the year, as promising steps. However, she cautioned that these measures must be based on solid data. “Without accurate information, we’re just guessing,” she said. “Our goal is to provide actionable insights that can guide policy and practice.”

As the global shipping industry continues to adapt to Middle East conflicts, the long-term effects on marine ecosystems remain a pressing concern. The University of Pretoria’s Whale Unit is not alone in this effort—other research groups and conservation organizations are also working to address the issue. Together, they hope to create a sustainable solution that protects whales while maintaining the flow of global trade.

Vermeulen’s team is also advocating for better communication between ship operators and conservationists. For example, sharing real-time data on whale locations could help vessels avoid areas of high risk. This would require integrating environmental monitoring systems into existing maritime infrastructure, a process that Vermeulen believes is both feasible and necessary. “The key is to align human activity with the natural behaviors of these animals,” she said.

In conclusion, the scientists warn that the current shift in shipping routes has created an urgent need for action. The doubling of vessel traffic in the region has increased the likelihood of collisions with whales, a problem that could have far-reaching consequences for marine biodiversity. As the International Whaling Commission reviews the findings, the hope is that new strategies will emerge to safeguard these majestic creatures in the face of changing global trade dynamics.

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