'Canaries' of the ocean highlight threat to world's ecosystems
Fifty-nine finfish species have 'disappeared' from fishermen's catches in the world's most species rich and vulnerable marine region, new research has shown.
|Bumphead Parrotfish Bolbometopon muricatum [Credit: Klaus Stiefel/Creative Commons]|
Drawing on the knowledge of local fishermen in the Philippines, the team were able to build a picture of how finfish populations have declined over the last 65 years.
Recording 59 species that were once common and have now disappeared from catches, the team highlighted five finfish that are now fighting for survival -- the green bumphead parrotfish, the humphead wrasse, the African pompano, the giant grouper and the mangrove red snapper. Publishing their findings this week in the science journal PLOS ONE, the report coincides with Endangered Species Day and highlights the "urgent need for action."
Lead scientist Nick Polunin, Professor or Environmental Science at Newcastle University, explains: "Most of us still think that nature is unlimited in the oceans.""But our coral reefs are good sentinels of global ocean change, and like the canary in the coal mine, they're telling us there's not much time left for action.
|Humphead Wrasse Cheilinus undulatus [Credit: Patryk Krzyzak/Creative Commons]|
"In the forests of India and Bangladesh it's the tigers and in China it's the Giant Panda; here in the Philippines we are showing that marine species are also very vulnerable. The list of endangered species is growing and we're very close to the tipping point."
Coral reefs occupy less than one percent of the marine area but they are home to 25 percent of all known marine fish species.
The team focussed their study on five areas recognised for being the most species rich in this exceptionally species-rich region: Lanuza Bay, Danajon Bank, Verde Island Passage, Polillo Islands and Honda Bay.
|Giant Grouper by Epinephelus lanceolatus [Credit: Jessica Paterson/Creative Commons]|
Conducting 2,655 interviews, 59 finfish names were reported to have gone missing from catches between the 1950s and 2014. Of the five species with highest frequency zero reported catches in all five areas, four are classed as vulnerable or endangered on the IUCN Red List. "Similar to the Newfoundland Cod, where we saw stocks crash due to overfishing, these reef finfish populations have been overexploited and they may never recover," explains Professor Polunin.
"The knock-on effects of losing these species are huge: loss of the big predators is likely to radically affect the structure of the whole system."
Professor Selina Stead, co-author and Professor of Marine Governance and Environmental Science at Newcastle University adds: "This paper provides clear evidence of the dramatic decline of once common reef fish, and the value of local knowledge in helping to build an accurate picture.
"Governments worldwide increasingly request evidence to support policy change and hopefully this paper will highlight the need for urgency for action.
Source: Newcastle University [May 20, 2016]