Key Concepts
- Climate change impact on UK waters
- Marine heatwaves
- Species migration and appearance of new species (e.g., sps jellyfish, octopus, bluefin tuna, humpback whales, fin whales, squid, anchovy, trigger fish)
- Impact on local fisheries (e.g., welk fishery in Whitstable)
- Ocean monitoring and temperature measurements
- Ecosystem disruption and livelihood impact
Changes in UK Waters: A Warming Trend
BBC analysis reveals that UK waters are experiencing their warmest start to the year on record, attributed to climate change. This warming trend is causing significant alterations in marine ecosystems.
Observations by Snorkelers
Heather Hamilton and her father, David, experienced snorkelers in Cornwall, have observed notable changes in the marine environment:
- Sps Jellyfish Blooms: Increased sightings of sps, jellyfish-like creatures, which are typically rare in UK waters. Heather describes them as "big chains...almost glowing slightly...like fairy lights," creating an "out of this world" experience.
- Octopus Sightings: A surge in octopus sightings. David, with 30 years of snorkeling experience, saw his first octopus in the summer before the recording, followed by about 10 in one spot with Heather in late May.
Bluefin Tuna and Whale Sightings
- Bluefin Tuna: Harry Pulking Horn and Ollie Hayes, local fishermen, have been documenting the increasing presence of bluefin tuna off the coast of Cornwall. These tuna, which can grow up to 3 meters long and weigh over half a ton, started appearing about 10 years ago. They describe seeing "a thousand" tuna appear suddenly to feed on bait fish.
- Whale Sightings: Increasing reports of humpback whales and fin whales (the world's second-largest whale species) in the southwest.
Scientific Monitoring and Data
- Ocean Monitoring Vessels: The UK's main ocean monitoring vessel, the Endeavor, uses floating sensors to measure various parameters, including temperature.
- Marine Heatwaves: Data indicates that marine heatwaves, previously a "one in every 10 years event," are now occurring "almost every year."
- Species Migration: The warming seas are attracting warm-water species like squid, anchovy, and trigger fish from the south.
Impact on Fisheries: The Welk Fishery Case Study
The welk fishermen of Whitstable provide a stark example of the negative impacts of warming seas:
- Welk Die-Off: In 2022, sea temperatures in the Thames Estuary exceeded 20°C for over 60 days, leading to a "massive die off of welks."
- Economic Consequences: Fisherman Ben Cooper experienced "abysmal catches" and had to sell one of his boats due to the decline in welk populations.
- Dependence on Welks: Ben notes that the fishery has become overly reliant on welks because "everything else has disappeared." He fears that "no welks, no fisherman in Whitstable."
- Export Market: The welks caught by Ben Cooper are processed in a factory in Kingslin and exported to Korea.
Canary in the Mine
Some scientists view the changes in UK waters as a "canary in the mine," indicating the types of changes to expect as the climate continues to change.
Conclusion
While the appearance of new species like bluefin tuna and whales might seem exciting, the warming seas pose a significant threat to marine ecosystems and the livelihoods that depend on them, as demonstrated by the welk fishery crisis. The increasing frequency of marine heatwaves and the resulting species die-offs highlight the urgent need to address climate change and its impact on our oceans.
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