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Water quality is one of the biggest threats facing the Great Barrier Reef. Tatters ❀/Flickr, CC BY-NC

The Australian and Queensland governments have delivered their progress report to the UN on the Reef 2050 Plan to ensure the long-term survival of the Great Barrier Reef.

The report focuses on water quality, and managing pollution runoff, but only deals in a superficial way with the other preeminent issue for the reef - climate change.

It shows recent progress on water quality has been slow, and ultimately we will not meet water quality targets without major further investments.

Progress?

The progress report claims some success in managing water quality through improved practices in sugarcane cultivation under the SmartCane program, and in rangeland grazing.

But actual reductions in sediment and nutrients loads to the reef over the last two years have been very small, as shown in the Reef Report Card 2015. This contrasts with the first five years of Reef Plan (2008-2013) where there was modest progress, as you can see below.

Great Barrier Reef Report Card 2015

The positive news out of the Report Card was that grain cropping and non-banana horticulture were doing well, but these are the industries we have little robust data on.

And there’s been little progress towards adequate management practices in sugarcane and rangeland grazing as well as gully remediation in the large dry tropics catchments of the Burdekin, Fitzroy and Normanby.

The specific actions and funding promised in this area over the next five years mentioned in the progress report which have some real substance are:

1. Direct a further A$110 million of Reef Trust funding towards projects to improve water

2. Bring forward the review of the Reef Water Quality Protection Plan and set new scientifically based pollutant load targets

3. Invest A$33 million of Queensland government funding into two major integrated projects

4. Better prioritise of water quality as a major theme in Reef 2050 Plan.

What we need to do

However these fall far short of the real requirements to meet water quality targets on the reef, set out in the Reef 2050 Plan and the Reef Water Quality Protection Plan.

The best estimate is that meeting water quality targets by 2025 will cost A$8.2 billion. Other estimates suggest we’ll need at least A$5-10 billion over the next ten years.

If we assume that about A$4 billion is needed over the next five years, the amounts mentioned in the progress report (perhaps A$500-600 million at most) are obviously totally inadequate.

There is thus almost no chance the targets will be reached at the nominated time.

This reality has been clearly acknowledged by Dr David Wachenfeld, the Director of Reef Recovery at the Great Barrier Reef Marine Park Authority. In fact the current progress towards the targets is so poor that we will not even get close.

The actions actually needed to manage water quality for the Great Barrier Reef are well known and have been published in the Queensland Science Taskforce Report and scientific papers.

The most important of these are:

1. Allocate sufficient funding (A$4 billion over the next five years)

2. Use the legislative powers already available to the Australian government under the Great Barrier Reef Marine Park Act (1975) and the Environment Protection and Biodiversity Conservation Act 1999 (the EPBC Act) to regulate agriculture and other activities in the reef’s water catchment

3. Examine seriously the need for land use change in the reef catchment. For example, we may need to look at shifting away from more intensive forms of land use such as cropping, which produce more pollutants per hectare, to less intensive activities such as beef grazing, forestry or conservation uses

4. Continue to improve land management in sugarcane, beef grazing and horticulture but acknowledge the need to extend these programs. We also need better practices in urban and coastal development

5. Critically examine the economics and environmental consequences of the further expansion of intensive agriculture in the reef’s catchment as promoted under the Australian government’s Northern Australian Development Plan

Progress on water quality management for the Great Barrier Reef, as clearly reported in the 2015 Report Card is poor. There is little chance we will reach the water quality targets in the next ten years, without upping our game.

Jon Brodie is also a partner in the consulting partnership C2O. See: http://www.c2o.net.au/

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Red crabs migrate across Christmas Island in their thousands each year. Ian Usher/Wikimedia, CC BY-SA

Have you heard the one about the wasp that kills the bug that feeds the ants that kill the crabs that keep the forests healthy on Christmas Island?

If not, that’s because it hasn’t happened yet, but it is a tale worth telling.

In the coming weeks, Parks Australia will release a 2mm wasp on Christmas Island to control the island’s yellow crazy ant infestation. Crazy ants are a major threat to the island’s wildlife, including its famous red crabs.

Biological control – when we use one species to control another – is infamous for giving Australia its cane toad invasion. So, how do we know this one will work?

Christmas Island and its crabs

Christmas Island is a unique natural habitat with many endemic species. The national park covers two-thirds of the island, which has been referred to as the Galapagos of the Indian Ocean.

Many people are aware of the red crabs whose mass migration to the sea has been described as one of the wonders of the natural world.

Christmas Island has many other species of crabs, including the impressive robber crabs. These may be the largest land-dwelling arthropod (the group that insects and crustaceans belong to) on earth.

Together these abundant land crabs clear the forests of leaf litter and maintain burrows that prevent soil becoming compacted, creating an open and diverse forest.

But this thriving natural system was disrupted when an invasive ant species became abundant on the island.

The ants

In the early 20th century, yellow crazy ants (Anoplolepis gracilipes) found their way to Christmas Island. These ants now form super-colonies, with billions of individuals across hundreds of hectares.

The crazy ants spray formic acid in the eyes and leg joints of the crabs, which immobilises them. The crabs soon die and become food for the ants.

In some cases, crabs that live in areas free of crazy ants are killed during their annual migration and so never return to their original forest. This creates crab-free zones even where the ants do not live.

With fewer crabs, the forest has become less diverse, with a dense understory and compacted soils due to the collapse of crab burrows. Other invasive species such as the giant African land snail have become common where crabs declined.

Parks Australia has been trying lots of different methods from aerial to hand-baiting to reverse the impact of yellow crazy ants on red crabs.

The impact was so severe that a chemical control program targeting the super-colonies began in 2001. This program has slowed the decline of crab populations but is expensive and time-consuming, so researchers began to look into other options, including using other species.

The bug: a scale insect

Super-colonies of yellow crazy ants require a reliable food source and this is provided by yet another invasive species: the yellow lac scale insect (Tachardina aurantiaca).

Scale insects (a type of true bug) suck the sap of trees and produce a sweet secretion from their anal pore called honeydew, which ants then harvest.

It seems that the super-colonies of these crazy ants could not survive without the carbohydrate-rich honeydew provided by abundant scale insects in a patch of forest.

There is evidence that the scale insects increase ant reproduction and make them more likely to attack other species. One large field experiment demonstrated that if we stopped the ants getting access to the scale insects, ant activity on the ground fell by 95% in just four weeks.

The scale insects may need the ants as much as the ants need the scale insects. Some ants protect the scale insects in the same way that humans protect their livestock, by chasing away other predators.

The interaction between these two invasive species has allowed them to build their populations to extremely high densities, something known as invasional meltdown.

The good news is that scale insects, unlike ants, are amenable to biological control. For instance, Australian lady bugs were spectacularly successful in controlling the cottony cushion scale in North America.

The wasp

The search began to find a species that could control the scale insect on Christmas Island. And we found it: a tiny wasp known as Tachardiaephagus somervillei, which attacks the yellow lac scale insect in its native Southeast Asia.

This wasp lays its eggs in mature female scale insects and kills them from the inside, producing more wasps that then lay eggs in more females. This wasp (and other predators) are so effective that the yellow lac scale insect is rare in its native habitat.

Obviously, we had to test that the wasp wouldn’t attack other species. Researchers did this in the field in Malaysia, an unusual approach that yielded excellent results. The scientists exposed eight closely related scale insects to the wasp, and none were harmed.

This proves that no other scale insect population on Christmas Island is at risk if the wasp is introduced, with the possible exception of another introduced scale insect that is a pest in its own right.

Researchers also checked that the wasps would still work when the scale insects are being tended by yellow crazy ants – and they still attacked. After years of research it is exciting to be on the verge of releasing this wasp on Christmas Island.

Postscript: the toads

We all know the biological control stories that went wrong. The introduction of cane toads to control cane beetles in Australia backfired spectacularly. In Hawaii, the introduction of mongooses to control rats failed because mongooses are active during the day and the rats were active at night. In both those cases, those species were introduced without sufficient research.

But these examples changed the rules and laws around introducing species. Today governments are much more aware of the risks of invasive species. Rigorous experiments and risk assessments are required before any introduction can occur.

In this case, researchers from La Trobe University have worked closely with Parks Australia and the Forest Research Institute of Malaysia to collect enough data to satisfy the Australian government.

We believe that this is the most closely scrutinised biological control project in Australia. When the wasps arrive on Christmas Island in a few weeks, we are confident that this will set an example for best-practice conservation.

Fewer ants means more crabs, healthier trees, fewer African snails and better soil. And it will save money being spent on expensive conservation efforts for years to come.

Parks Australia has produced a special animation on the program – check it out here at http://www.parksaustralia.gov.au/christmas/news/biocontrol.html.

Susan Lawler has received funding from the Australian Research Council in the past.

Peter Green receives funding from the Department of Environment and Energy

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