Logo of Phnom Penh Post newspaper Phnom Penh Post - Human disturbances threaten conservation of cave bats in Cambodia, study says

Human disturbances threaten conservation of cave bats in Cambodia, study says

A stream of bats emerges from a cave in Battambang in 2014. A new study has said human disturbance could be detrimental to the conservation of the Kingdom's cave bats. Photo supplied / Shankar S
A stream of bats emerges from a cave in Battambang in 2014. A new study has said human disturbance could be detrimental to the conservation of the Kingdom's cave bats. Photo supplied / Shankar S

Human disturbances threaten conservation of cave bats in Cambodia, study says

Researchers in a new study say visitor activities in caves in Cambodia pose challenges for bat conservation, noting that human disturbance is often detrimental to populations, which in turn take substantial time to recover from declines.

Researchers carried out their fieldwork in Phnom Chhngok, a limestone karst outcropping popular with tourists in Kampot province. The study was published on Monday in the peer-reviewed PLOS Neglected Tropical Disease journal.

Researchers assessed the reproductive cycles of two species of bats over 23 months while also evaluating the rate of human visitation. Birth peaks, they found, coincided with the most cave visits during the Khmer New Year holiday.

“While the impact of visitor disturbance on population recruitment cannot be empirically assessed due to the absence of historical data for cave bat populations in Cambodia, it is nonetheless likely to have been considerable and raises a conservation concern,” the researchers write. “Uncontrolled human disturbance often leads to decrease in numbers of bats roosting in caves and numerous studies have demonstrated the detrimental effects of cave tourism in particular.”

Neil Furey, one of the study authors, said research worldwide, including in Southeast Asia, has demonstrated that uncontrolled human access and disturbance to caves is detrimental to cave-roosting bats.

For example, a 2016 study found that disturbance during critical periods, such as during reproduction, can lead to the death of young bats after they lose their roost-hold and fall, and it can also lead to females abandoning their roost for less ideal sites where reproduction success is lower.

Ken Sereyrotha, country director for Wildlife Conservation Society, said it is indeed believed that direct human disturbance leads to a decline in bat populations, but that there are other issues involved.

“Human disturbance is just one factor,” he said. “There should be other factors as well, such as climate change.”

The WCS hasn’t conducted any comprehensive research, but there is concern over a decrease in the bat population as they are linked to the health of the agriculture process in the country because they prey on insects.
“[A population decrease] then . . . leads to an increase of pesticides and chemicals to kill all the insects,” he said.

The study’s researchers say they are advocating for sustainable cave management practices in Cambodia, particularly given that many are the site of rituals and are popular among tourists.

Those responsible for the management of cave sites in the country should try to minimise disturbance for the bat colonies during critical reproductive periods, such as during pregnancy, lactation and weaning, which each tend to take place at specific times of year.

“For instance, this could be persuaded through practices, such as: prohibiting visitors to roost locations during maternity periods; ensuring visits by small groups; accompanied by a guide; timed visits; limiting disturbance; and avoiding or reducing lightening, noise, trash, and other anthropogenic disturbances as much as possible,” the study says.

Furey said surveys of 98 caves in three karst regions in Cambodia found that only 10 percent are undisturbed by humans, while caves used for religious and tourism purposes accounted for roughly half of the total, or 45 total.

“On use of caves for religious purposes (Buddhist shrines in this case), we advocate engagement with the Buddhist movement to address disturbance posed by cave visitors in Cambodia and elsewhere,” Furey wrote in an email. “Conservation organisations like Fauna & Flora International are already doing this in Myanmar.”

Sereyrotha said recommendations to minimise human disturbance are useful, but more discussion is needed to find a way to implement them, and to incorporate local communities.

Officials at the Ministry of Tourism and the Ministry of Environment could not be reached for comment.

MOST VIEWED

  • NY sisters inspired by Khmer heritage

    Growing up in Brooklyn, New York, Cambodian-American sisters Edo and Eyen Chorm have always felt a deep affinity for their Cambodian heritage and roots. When the pair launched their own EdoEyen namesake jewellery brand in June, 2020, they leaned heavily into designs inspired by ancient Khmer

  • Schools drawn into Manet degree row

    Prime Minister Hun Sen stepped into the Hun Manet-Sam Rainsy war of words over the validity of Manet’s degree from the US Military Academy at West Point, set off by Rainsy’s claims that Manet had received a “second-class degree” or “honorary degree”. Hun

  • Cambodia records first Omicron community case

    The Ministry of Health on January 9 reported 30 new Covid-19 cases, 29 of which were imported and all were confirmed to be the Omicron variant. The ministry also reported 11 recoveries and no new deaths. Earlier on January 9, the ministry also announced that it had detected the Kingdom's

  • The effects of the USD interest rate hike on Cambodian economy

    Experts weigh in on the effect of a potential interest rate expansion by the US Federal Reserve on a highly dollarised Cambodia Anticipation of the US Federal Reserve’s interest rate hike in March is putting developing economies on edge, a recent blog post by

  • PM eyes Myanmar peace troika

    Prime Minister Hun Sen has suggested that ASEAN member states establish a tripartite committee or diplomatic troika consisting of representatives from Cambodia, Brunei and Indonesia that would be tasked with mediating a ceasefire in Myanmar. The premier also requested that Nippon Foundation chairman Yohei Sasakawa

  • Kampot tourism quay ‘90% done’

    Construction on Kampot International Tourism Port – a 4ha quay in Teuk Chhou district about 6km west of Kampot town – has fallen off track, reaching 90 per cent completion, according to a senior Ministry of Tourism official last week. The project is now planned to be finished