Sea change at Kaikoura
ฝัง
- เผยแพร่เมื่อ 2 ส.ค. 2017
- It would have been an incredible event to witness, if it hadn’t happened in darkness, just after midnight on the morning of November 14, 2016.
A 7.8 magnitude earthquake forced a 110 kilometre stretch of the Kaikoura coast to rise up from the sea. The uplift varied, from half a metre to almost 6 metres at Waipapa Bay..
Aquatic creatures and marine vegetation which had lived mostly underwater, struggled to adapt to a terrestrial world. Especially hard hit were slow-moving species such as limpets and paua, and thousands of them perished under the summer sun.
Today, it’s easy to identify areas of uplift, most platforms are covered by a carpet of green algae, commonly known as sea lettuce.
It’s flourishing in the new, drier environment.
Shawn Gerrity and Tommaso Alestra, Marine Ecology Researchers from the University of Canterbury, are working with the Ministry of Primary Industries (MPI) to monitor the effects of the uplift on marine life.
Both men were familiar with the environment, having spent many hours studying the Kaikoura coast pre-earthquake.
Alestra says “it’s quite upsetting because over the years doing my research here around the peninsula i got to love these reefs.”
He says the reefs have changed a lot, there have been massive die-offs and they are “bare and empty now.”
Except for the sea lettuce.
Gerrity wants to determine if the presence of the sea lettuce is slowing down the recovery of other algal species and invertebrates.
Certainly the wait for paua to re-establish will be a lengthy period, and may involve a decade-long closure of the paua fishery.
“How long are they going to take to recover, to the point where it could sustain the recreational fishery?” asks Gerrity, “we don’t know yet.”
Another struggling species is bull kelp. Alestra says it could take years for stocks to recover.
“Many plants were lost because they were not able to survive the heat and the dislocation from the uplift,” he says.
Local, long-time fisherman, Paul Reinke, has been able to continue his crayfish operation.
The rock lobster fishery was closed for a month after the earthquake, during which Reinke and others assisted MPI in surveying crayfish numbers.
He operates out of South Bay where the uplift was around a metre.
“For months you couldn’t get your head around how low the tide was.”
The uplift may have taken just a few, spectacular seconds, but for many plants and animals the impact will be felt for many years, though according to Tommaso Alestra, no species have been lost entirely.
“I hope they can little-by-little recover and come back to what they used to be like.”
Watch the video for the full story.
www.chchdilemmas.co.nz
what an amazing facelift to the coastline, good bad or indifferent - it certainly has changed many aspects around this coastline. As an xpat in aussie I am humbled by the sight of all those dramatic changes & how NZ has recovered. To me it is sad that it appears some species could be lost 4ever but like many comments here I too am positive that they may return plus give some new ones just to keep the adrenalin flowing for our Scientists, thank you for sharing - awesome info shared.
And good on them for not ruining it by filming it in vertical!
1:34 - this isn't sad. This is nature, doing its thing. Not only is it making New Zealand larger, it is creating new habitats below the new shoreline. It's also creating lots of additional rocky coastline for to explore, and its providing lots of work for guys like him.
Scientists that get sad about stuff like this are just missing out on an excellent learning experience.
Nature does whatever she wants...
Thanks, will be helpful for NCEA.
Natures Force just incredible - a great way to witness changes along the coastline is to take an Kaikoura Aftershock Adventure with South Pacific Whale Watch. To the Marine Ecologist we are grateful for your expertise, explanation and guardianship of our delicate resource. We look forward to more updates! Kia ora from the team at South Pacific Helicopters NZ @southpacifichelicopters
Now they don't need to worry about sea level rise.
Great video!
Please explain why this is listed as 'Christchurch Dilemma', when in fact it's a Marlborough-Kaikoura issue?
After THE BIG ONE.
Far to many fucken seals in kaikoura
Suck that stance from DOC was for people not to return the paua and crays to the sea, and not to touch them, i return hundreds of cray fish and paua to the sea 👍 i did what was right, not what the suits at DOC though was right😊
Yeah I went to food bank goddess doing lavish feed with them ant know joke World🏁⚡🧛🧭