Tag Archives: jungles

Tigers Seems to Be Making a Comeback in Sumatra’s Isolated Jungles

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Camera trap photo of a Sumatran tiger in the Leuser Ecosystem, Indonesia

Figel et al. 2025, BKSDA-Aceh, DLHK

Camera trap studies have discovered over double the count of endangered Sumatran tigers compared to those recorded on other Indonesian islands, signaling a positive outcome for conservation initiatives.

The Sumatran tiger represents the last surviving population of the subspecies panthera tigris sondaica, one of the two subspecies of tigers.

Collaborating with the Gayo indigenous community, researchers positioned 60 camera traps on trees within a previously unexplored area of the Leuser ecosystem on Sumatra, one of Southeast Asia’s largest remaining rainforests.

These traps captured images of 17 tigers over 90 days in 2023 and 18 in 2024, in stark contrast to earlier 90-day assessments in Sumatra, which reported an average of seven tigers. The survey documented 14 adult female tigers, 12 males, three cub pairs, and one tiger of unknown gender.

“This surpassed my expectations because previous research indicated that tigers wouldn’t be found in such densities,” stated Joe Figel from the conservation group Hutan Harimau. “This is a very promising finding and highlights the significant conservation efforts in this region.”

Sumatran tigers face threats such as poaching for trophies and traditional medicine, alongside logging activities depleting their vital dipterocarp tree habitats. Due to insufficient data, estimates for their population range from 173 to 883.

While a 90-day period was utilized for initial comparisons, researchers ultimately extended their study to 180 days in both 2023 and 2024, delivering a more comprehensive seasonal record, noted Deborah Marter from Flora and Fauna International, who was not a part of the study.

A mother grooming her large male cub. Eight months later, he was found safe and sound living independently.

Figel et al. 2025, BKSDA-Aceh, DLHK

The unexpectedly high tiger population in the Leuser Ecosystem indicates that the lowland forests are abundant in prey, particularly sambar deer, according to Figel. It also implies that monthly ranger patrols are effective in curbing poaching activities.

Located near Gunung Leuser National Park, the study area is overseen by rangers funded by the NGOs Forum Conservasi Roussel and Hutan Harimau, in partnership with the Environment and Forestry Department of the previously conflict-affected Aceh region.

However, research indicates a need for additional ranger support. Recently, tigers have vanished from Vietnam, Cambodia, and Laos.

“Do we need any further warning signs?” asks Figel. “Tiger populations throughout Southeast Asia are facing a critical crisis.”

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Source: www.newscientist.com

New excavations shed light on early human activity in Laos’ jungles

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Archaeologists excavating Tam Parin (Monkey Cave) in northeastern Laos have discovered some of the earliest fossil evidence homo sapiens Presence in mainland Southeast Asia.

Excavation survey at Thamparin in northeastern Laos. Image credit: Hernandez others., doi: 10.1016/j.quascirev.2024.108982.

“Using a technique known as microstratigraphy, we were able to reconstruct past cave conditions and identify traces of human activity in and around Tamparin,” said Flinders University's Ph.D. says. Candidate Vito Hernandez.

“This also helped us determine the exact conditions in which some of the earliest modern human fossils found in Southeast Asia were deposited at depth.”

Microstratigraphy allows scientists to study soils in minute detail, identifying structures and features that preserve information about past environments, as well as potential structures and features that were overlooked during the excavation process due to their small size. Even traces of sexual human and animal activity can be observed.

The hominin fossils discovered by archaeologists were deposited in Tamparin Cave between 86,000 and 30,000 years ago.

However, until now, no detailed analysis of the sediment surrounding these fossils has been conducted to understand how they were deposited in the cave or the environmental conditions at the time.

The new findings reveal that conditions within the cave varied dramatically, from a temperate climate with frequently wet ground conditions to a seasonally dry climate.

Dr Mike Morley from Flinders University said: “This environmental change would have affected the topography inside the cave and influenced how the deposits containing hominin fossils were deposited inside the cave.” said.

“How fast! homo sapiens The theory that they were buried deep inside the cave has long been debated, but our analysis of the sediments suggests that the fossils were pushed into the cave as loose sediment and debris that accumulated over time and were washed away by heavy rains. It has been shown that it was likely carried by water from the surrounding hillsides. ”

Researchers have also identified tiny traces of charcoal and ash preserved in the cave's sediments, indicating that forest fires occurred in the area during the dry season, or that humans visited the cave. This suggests that fire may have been used inside the cave or near the entrance. .

“With this study, our team gained unprecedented insight into the dynamics of our ancestors, who dispersed throughout Southeast Asia's ever-changing forest cover and during periods of regional climate instability.” ,” said Dr. Fabrice Demeter, a paleoanthropologist at the National Museum of Nature and Science. University of Copenhagen.

of result Published in a magazine dated October 10th Quaternary Science Review.

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VC Hernandez others. Late Pleistocene–Holocene (52–10 ka) microstratigraphy, fossil taphonomy, and depositional environment of Tam Parin Cave (northeastern Laos). Quaternary Science Reviewpublished online October 10, 2024. doi: 10.1016/j.quascirev.2024.108982

Source: www.sci.news