Tag Archives: Dalhousie University

Boris Worm The Jellyfish Guy says New York turns into some kind of modern Venice with Sea Level Rise

Coastal communities, including those in Newfoundland and Labrador, could be drowned by significant sea level rise before the end of the century according to a new report released by the U.S. government (NOAA). Boris Worm, a marine scientist at Dalhousie University in Halifax, N.S., says a report by the American National Oceanic and Atmospheric Administration suggests sea levels could rise by 2.5 metres by the year 2100. “They were asking the question, how will any given amount of sea level rise be felt in the U.S. and what are the likely scenarios for sea level rise given current emissions,” he told CBC Radio’s The Broadcast. “They’ve come up with a range of projections, and the notable thing here is that that range of projections is a lot larger than it used to be.” Worm said less than a decade ago, the expectation was between one and two feet of sea level rise by the end of the century.  “They’ve now corrected this and said it’s going to be a lot more, and it could be up to 8.2 feet,” he said. “If that comes true, it means New York turns into some kind of modern Venice, Venice turns to some kind of Atlantis, and I don’t know what it means for Newfoundland … it really means a complete rethinking of how we live close to the coast.” Read the story here 13:45

Canadian Perspective on Atlantic Cod Stocks & Management

CFOODLast week we released a two part feature on the status of Atlantic cod stocks. Click here  Part was a general overview of the status of stocks while Part 2 dove deeper into the reasons behind different statuses.

Jeffrey Hutchings, a fishery scientist at Dalhousie University was inspired to comment on our CFOOD feature below;

Despite voluminous research, science discussions of Atlantic cod can verge on the simplistic. Overfishing and ‘the environment’ unhelpfully portrayed as alternative or additive causes of decline. Temperature presented unequivocally as the driver of recruitment. Variable attention to how differential responses to natural and human-induced environmental stressors can be influenced by basic elements of demography — population size, age structure, natural mortality — especially when these fall outside a population’s norm. The collapse of Northern cod was unprecedented but the low temperatures that cod experienced prior to collapse were not (it has been as cold, or colder, if one’s temporal horizon extends beyond the mid 20th Century for this 500-year-old fishery). Recruitment failure is not affecting the recovery of some depleted stocks, such as Southern Gulf of St. Lawrence cod, but altered predator-prey interactions – predicated by prolonged overfishing – almost certainly are. Not all northeast Atlantic cod are doing well, as the current status of those along the Norwegian coast will attest. Read the rest here 14:07

Shark researchers question DFO policy on catch-and-kill derbies

screen-shot-2016-08-17-at-9-53-23-amThe catching of a large female mako shark has prompted some researchers to question the Fisheries and Oceans Canada policy on Nova Scotia’s annual shark derbies. The shark derbies are annual community festivals that include a shark-fishing event. Fishermen compete to catch large sharks, which are then turned over to the Department of Fisheries and Oceans so scientists can gather biological data. Sharks smaller than 2.4 metres are tagged and released. Brendal Townsend, a shark researcher at Dalhousie University, says she is concerned that the data collected is no longer scientifically useful. She believes the same information could be gathered through catch-and-release methods. Read the rest here 10:13

Torpedo ray tagged by Dalhousie University researchers

Researchers from Dalhousie University in Halifax are hoping technology will help them learn more about some underwater giants living off the East Coast.  What makes this ray somewhat unusual from its relatives is its powerful electric organs, visible as large, kidney-shaped patches on the side of its head that can put out a shock of about 200 volts. “It uses that to stun prey, knock it out and then it swallows them whole,” Read the rest here 07:56

Two variations so far – “Canada’s cod, and many other depleted fish, unlikely to recover” and “Study offers bleak outlook for fish recovery”

By Margaret Munro, Postmedia News – Canada’s once bountiful cod stocks are not likely to bounce back, according to an international study on the dangers of overfishing. “Here we are more than 20 years after the cod was effectively depleted, and according to our analysis, the recovery of the cod stocks is highly improbable,” says fisheries scientist Jeffrey Hutchings at Dalhousie University, co-author of the study published in the journal Science on Thursday….at the end of the article: “Ecosystems change,” says Hutchings, noting how seals, herring and mackerel now fill some of the gaps left by Canada’s cod collapse. (which part does he not understand?) contined

Aly Thomson, The Canadian Press HALIFAX – The recovery of overexploited fish populations such as cod has been slower than expected and many depleted stocks may never be able to bounce back, a new study says. continued

It would be great if our Canadian friends would leave comments about this. BH

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