As may be expected, marine species, including whales, face many natural and unnatural threats while spending their lives within the oceans. Natural threats can include impacts from predators, competition within their environment, and so on. A focus here will, however, be given to anthropogenic threats whales face, those which are caused by human activities. These threats stem from commercial and recreational uses of the oceans, the human tendency to pollute and disregard the health of the environment, and the excessive human contribution to climate change. This includes impacts of vessel strikes, entanglements, marine debris, and noise pollution, all of which will be covered throughout the Whale Safe Project.
Newfoundland and Labrador is surrounded by ocean waters which are teeming with marine ecosystems and diverse marine life. This includes several species of whales that are impacted by the aforementioned threats. These species and waters are an important part of the culture of Newfoundland residents, emphasizing the importance of spreading understanding about these threats, working towards preventing their exacerbation, and mitigating their impacts to preserve these important parts of our ecosystem and lives.
Vessel Collisions
The use of boats in the ocean waters around Newfoundland is an important part of our culture, economy, and industry. This includes commercial uses, such as our famous cod fishery, and recreational uses, such as private boating and fishing. Both of these pose threats to whales and other marine species through the interactions between these species and boats.
Vessel collisions and strikes are a big threat to marine species. These occur when a boat physically hits a whale or other species while travelling through ocean waters. This issue has become more prominent as the vessel traffic within our oceans has steadily increased, causing more boats and marine species to cross paths. This can cause serious harm to the animal, leaving permanent scarring or disabilities and in some cases causing death. With the high traffic of vessels within Newfoundland waters, including fishing vessels that go out on a daily basis, it is important that individuals understand how to avoid whales and other marine species and prevent harming them.
Fishing Gear Entanglements
Another prominent threat to many marine species, including whales, are entanglements. Entanglements occur when a marine animal interacts and gets caught up in fishing nets, ropes, and gear, or other marine debris including plastics. Whales are susceptible to this threat as entanglements around their fins, tail, and mouths are common. Entanglements can cause physical injuries to marine species, can prevent them from feeding if their mouths are blocked, and can even cause marine mammals to drown due to the weight of the debris responsible.
Fisheries are a cornerstone to the economy within Newfoundland and Labrador and are a massive part of our local culture and lifestyle. This does, however, lead to the occasional loss or abandonment of fishing gear which can contribute to the issue of entanglement and affect local marine species. Species can also be affected in a similar manner due to bycatch while fishing. This emphasizes the need to inform the public about their possible impact on marine species and promote safer alternatives, such as wildlife-friendly fishing gear and avoiding outdated or unsustainable fishing practices.
Pollution
Pollution within both terrestrial and marine ecosystems is another big issue that has resulted from human activities and affected marine wildlife. Marine debris describes garbage and other materials which make their way into the ocean and remain there. This can include all sorts of litter of varying sizes. Micro and macro plastics are a big part of this problem as these materials take hundreds of years to break down within the oceans.
An emotional example of this issue can be observed in The Great Pacific Garbage Patch seen below. This patch is the largest offshore plastic accumulation zone recorded and has resulted from the approximate 1.15 to 2.41 million tonnes of plastic that enter the ocean as debris each year. The collection of marine debris sits in the North Pacific Ocean.
The immense degree of marine debris in our oceans poses a risk to whales and other marine species as these animals commonly consume these materials accidentally while feeding. When this happens, the plastic debris cannot be digested by these marine species and remain within their stomach. This can make the animals feel full and can prevent them from feeding and taking in nutrients in the future. Some debris can also mimic food sources and as a result, can trick marine species into eating them. Images of beached whales with stomachs full of plastics have become more common within the media in recent years, showing the devastating impact of this issue and stressing the importance of reducing our impacts on the oceans.
Photography by Ray Boland, NOAA.
Noise pollution
Noise pollution is another pollution type that poses a threat to whales and other marine species. Anthropogenic noise describes sounds within marine environments that result from human activities, spread throughout the environment, and affects species within it. These sounds can result from vessel traffic, pile driving and seismic activities, windmills, oil and gas exploration and drilling, SONAR, and construction activities. The impacts of noise pollution are especially concerning to whales and other marine mammals which are highly vocal and rely on sound and echolocation to function in their environments. Masking, for example, is a common result of anthropogenic noise which reduces a marine animal’s ability to detect sounds of interest within their environment as these sounds are drowned out by human activities.
The impacts of marine noise pollution can include inducing behavioral changes in affected species, displacement in their environments, shifts and influences to migratory paths, avoidance, unnecessary stress on the animals, animals becoming stranded, and hearing damage or acoustic trauma. The latter of this list can include temporary and permanent threshold shifts which affect the range of sounds the animal can detect and can seriously affect their livelihood. Within Newfoundland, noise pollution created by vessel traffic in our fishery and recreational areas should be of concern. Therefore, communication of these possible impacts to boat-goers within our province is important to protect our marine species and preserve our local ecosystems.
Climate change
Climate change is a continual concern to species and environments worldwide. Within our oceans, temperatures are rising, species are shifting Northward in search of cooler waters, habitats are becoming uninhabitable due to temperature changes and ocean acidification, and ocean waters are rising as sea ice and glaciers melt. The changes in ocean distribution of species caused by these impacts of climate change affect their habitats and migratory patterns but also impacts our fisheries, culture, and tourism. These three aspects are a big part of Newfoundland life, with our long history in the fisheries, the industry founding our economy, and our use of local whale species and other marine species as tourist attractions to draw people to our province. This local example stresses the impacts that climate change can have on the ecosystem and our lives and the importance of combating these trends and working towards resolving the climate crisis.