Mega-pesky! New paper 'unexpectedly' finds CO2 and 'acidification' dramatically IMPROVED fish reproduction in coral reefs

A paper published today in Global Change Biology finds that increased dissolved CO2 and decreased pH [so-called "acidification"] had the completely unexpected result of dramatically increasing reproduction [by 82%] in a coral reef fish. According to the authors, "This study provides the first evidence of the potential effects of ocean acidification on key reproductive attributes of marine fishes and, contrary to expectations, demonstrates an initially stimulatory (hormetic) effect in response to increased pCO2."

Increased CO2 stimulates reproduction in a coral reef fish

Gabrielle M. Miller et al

Abstract:

Ocean acidification is predicted to negatively impact the reproduction of many marine species, either by reducing fertilization success or diverting energy from reproductive effort. While recent studies have demonstrated how ocean acidification will affect larval and juvenile fishes, little is known about how increasing partial pressure of carbon dioxide (pCO2) and decreasing pH might affect reproduction in adult fishes. We investigated the effects of near-future levels of pCO2 on the reproductive performance of the cinnamon anemonefish, Amphiprion melanopus, from the Great Barrier Reef, Australia. Breeding pairs were held under three CO2 treatments (Current-day Control (430μatm), Moderate (584μatm) and High (1032μatm)) for a 9-month period that included the summer breeding season. Unexpectedly, increased CO2 dramatically stimulated breeding activity in this species of fish. Over twice as many pairs bred in the Moderate (67% of pairs) and High (55%) compared to the Control (27%) CO2 treatment. Pairs in the High CO2 group produced double the number of clutches per pair and 67% more eggs per clutch compared to the Moderate and Control groups. As a result, reproductive output in the High group was 82% higher than the Control group and 50% higher than the Moderate group. Despite the increase in reproductive activity, there was no difference in adult body condition between the three treatment groups. There was no significant difference in hatchling length between the treatment groups, but larvae from the High CO2 group had smaller yolks than Controls. This study provides the first evidence of the potential effects of ocean acidification on key reproductive attributes of marine fishes and, contrary to expectations, demonstrates an initially stimulatory (hormetic) effect in response to increased pCO2. However, any long-term consequences of increased reproductive effort on individuals or populations remains to be determined.

SOURCE

Woe! Australia has not "reported" to that great heap of corruption that is the United Nations

Just Greenies at work trying to impose their anti-human values on everyone else.  To them, no proof is needed that human activity is harming the reef.  That is just axiomatic to them -- they just  want to stop everything.  There's no such thing as a happy Greenie

THE Great Barrier Reef is set to be named as a World Heritage Site in danger by UNESCO next month.

A long-awaited assessment of the reef by UNESCO and the International Union for Conservation of Nature (IUCN), released on Friday evening, says decisive action must be taken to avoid a listing in June.

The report claims the federal and Queensland governments have failed to improve water quality or halt coastal developments that could impact the reef.

Only one annual water quality report card has been published, in 2011, which covered 2009.  A second report card was due in early 2012, but it's yet to be delivered.

The report also says there's been no clear commitment by the either federal or Queensland governments to limit port developments near the reef.  Instead about 43 proposals are under assessment.

"The above-mentioned issues represent a potential danger to the outstanding universal value of the property," the report said.

"The World Heritage Centre and IUCN ... recommend that the committee consider the Great Barrier Reef for inscription on the list of World Heritage in Danger ... in absence of a firm and demonstrable commitment on these priority issues."

Prime Minister Julia Gillard said the Federal Government was committed to keeping the reef a great heritage area for the world.

"In the last couple of weeks I announced a $200 million reef rescue commitment," she told reporters in Melbourne.  "We are very committed and we'll continue to pursue those kind of commitments in the future."

But Greens Senator Larissa Waters called on Liberal and Labor to support a Senate bill which would adopt the World Heritage Committee's recommendations as law.

"The Newman and Gillard governments have continued to fast-track mega industrial ports alongside the reef," she said.  "Protecting the Great Barrier Reef must be beyond politics and all parties should support my bill."

World Wildlife Fund spokesman Richard Leck said UNESCO had put Australia in the sin bin.  "We will likely see a reef showdown this June," he told AAP.

The only other world heritage sites in danger that aren't in a developing country or an active war zone are the UK's Liverpool Maritime Mercantile City and Florida's Everglades.

SOURCE