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A rare glimpse of a river dolphin in Cambodia. Erwan Deverre/Flickr, CC BY-NC

It’s hot, and you’re sitting sweating in a small wooden boat. Your cold bottle of water is dripping, and the pink polyester roof does nothing to shade the glare of the setting sun. The young man at the back of the boat smiles and points at the water, and there you see it: one of Cambodia’s most magnificent spectacles.

Angkor Wat? No, it’s a critically endangered dolphin rising from the brown waters of the Mekong River, breathing, looking at you, and then disappearing below.

Our recent research suggests that while dolphin and whale tourism in Southeast Asia can be great for communities, it can also come at a cost to the environment.

So what should you look for if you’re going on tour?

Tourism boom

Dolphin- and whale-watching tourism is a booming industry worldwide, and it’s growing apace in developing parts of Asia. Many tourists flock to see spinner dolphins in Bali or Bohol; blue whales off Sri Lanka; Chinese white dolphins in Hong Kong; or Irrawaddy dolphins in great rivers like the Mekong and Ayeyarwaddy (as the Irrawaddy is now known).

Tourist boats looking for dolphins in the Mekong River, Cambodia. G E Ryan

This interest in seeing wildlife is a boon: it provides jobs for local people driving boats, selling souvenirs, or staffing restaurants and hotels. It also gives a growing Asian middle class the chance to get close to wildlife that many people are increasingly separated from in day-to-day life.

By providing jobs and building compassion for the species it targets, dolphin-watching tourism can thus provide an incentive to protect threatened species such as critically endangered river dolphins. But it has a cost.

Boat traffic can stress dolphins. What can seem like insignificant short-term stresses are known to have long-term costs on whole populations if they are repeated over a long time.

Tourist boats visiting dolphins several times a day can cause exactly this sort of problem, especially if they harass and chase animals. This happens in many places where regulation is absent or poorly enforced. We have seen large numbers of boats swarming groups of dolphins in many places.

Often such tourism is limited only by the numbers of boats and crews willing to conduct it. Understanding the long-term ecological effects of tourism activities on dolphin populations is difficult; it needs long-term data, which can be expensive and slow to collect.

This kind of work is rarely done, especially in developing Asia. So we don’t really know how tourism affects dolphins and whales in this area.

With colleagues, we recently developed a rapid risk-assessment method to understand the risk tourism poses to wildlife. We applied it to seven sites in six countries in developing Asia, including sites on the Mekong River in Cambodia, on the coasts of Bohol in the Philippines, Bali, Malaysian Borneo and Thailand, and in India’s Chilika Lagoon.

We found the highest risk from tourism was to Irrawaddy dolphins at Chilika Lagoon, and to spinner and other dolphins at Lovina Beach in Bali. Both of these sites have no regulation of the number of boats visiting dolphins, or how boats are operated around the animals. This leaves large numbers of boats free to chase dolphins around – hardly ideal.

Spinner dolphins and tourist boats in Indonesia. Putu L Mustika How to travel lightly

The sites we assessed are just a drop in a sea full of opportunities to view wild whales and dolphins. So next time you’re heading out on holiday and considering going to see some of the water’s most charismatic inhabitants, how do you know if you should go?

Here’s a few things to consider:

• Is there a land-based alternative to see the animals without disturbing them?

• Is there a code of practice for boat operators to prevent stressing animals? This may not be obvious. Talk to other tourists about how boat drivers operate around animals. Avoid operators who chase, cut off, or otherwise harass animals.

• Ask your driver not to chase animals, and reward them with thanks or tips for driving carefully around the animals.

• Ask yourself how you can meaningfully contribute to the protection of these species in other ways.

Watching wild animals in their natural environment is one of life’s great experiences. Few things in this world are as uplifting as the sight of a dolphin breaking the water’s surface, and it’s a sight we hope everyone can enjoy for countless generations.

We’re sure we will be able to if we encourage responsible dolphin-watching tourism. And that can start with you on your next getaway into the wild!

Putu Liza Mustika is also affiliated with Cetacean Sirenian Indonesia, an environmental NGO in Indonesia.

Gerry Ryan and Riccardo Welters do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.

Under Norway’s endangered predator laws, only 15 lone wolves proved to pose a threat to livestock

The Norwegian government has issued a last-minute reprieve for 32 of the 47 wolves that had been earmarked for a cull to protect sheep flocks.

The plans to kill two-thirds of the country’s wolves caused outrage among conservationists at home and abroad when they were announced by local predator management boards in September, with warnings the cull would be disastrous for the species.

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The government is exploring whether its ban on tiny pieces of plastic in cosmetics should be extended to other household products, to protect fish and other marine life.

Ministers promised earlier this year to ban microbeads in personal care products such as toothpaste and face scrubs by the end of 2017, but stopped short of pledging to ban them in other products.

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A new report finds strong support for clean energy, international climate agreements, and cutting carbon pollution - across the political spectrum

It’s almost an accepted dogma that in the United States (and in several other countries), liberals are much more in favor of taking actions to curb climate change whereas conservatives block such actions. That’s certainly true within the halls of power. For instance, in the United States, it has become a litmus test for Republication candidates to deny humans are causing climate change, to try to claim that it isn’t important, in many cases to demonize the messengers (the scientists), and to work to halt climate science so we won’t know how bad the problem is.

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European parliament draft inquiry into dieselgate has found EC ignored evidence of emissions test cheating

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The commission ignored evidence of emissions test cheating from its own science body, the Joint Research Centre (JRC), partly out of a desire to “avoid placing burdens on industry”, according to the draft report seen by the Guardian.

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New research finds householders more likely to bin food over festive season due to lack of culinary knowhow

One in three UK consumers admit to binning turkey and sprouts for their Christmas dinner before it even reaches the table because of their lack of culinary knowhow, a new report has revealed.

Official figures show that UK households throw away 7m tonnes of food every year, but the new research from supermarket chain Sainsbury’s shows householders are more likely to bin food over the festive season because they don’t know how to prepare and cook it.

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Canada’s Hudson Bay is as ice-free in November as on a summer’s day and polar bears could be extinct here by mid-century. If the bears are in trouble, so are we

Churchill, on the banks of the Hudson Bay in Canada, is known as the polar bear capital of the world. Hundreds of bears gather there each year before the sea freezes over in October and November so they can hunt seals again from the ice for the first time since the summer.

I first went there 12 years ago at this time of year. The place was white, the temperature was -20C, and the bears were out feeding.

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A guide is now available for this nationally listed endangered ecological community.

Claxton, Norfolk I recall the circumstances of the cut, how it was stored and then the moment it was sectioned to fit the fire

The garden task that gives me greatest satisfaction is the cutting of our winter wood stack. I like to joke that our logburner consumes only hand-prepared organic “food”, and there is even a sense in which each piece is an individual.

Over the years I’ve learned that the secret to preparing logs is not some fancy axe or equipment. It is time. I have thus worked out a four-stage process that spans two years, beginning with the moment when the live trees are felled.

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The year that was: Donald Trump, soaring temperatures, mass-market EVs, and price parity - even in NSW - for solar and storage.

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