Journal of Threatened Taxa |
www.threatenedtaxa.org | 26 June 2022 | 14(6): 21149–21154
ISSN 0974-7907 (Online) | ISSN 0974-7893
(Print)
https://doi.org/10.11609/jott.7761.14.6.21149-21154
#7761 | Received 28 November 2021 | Final
received 03 June 2022 | Finally accepted 07 June 2022
The occurrence of Indochinese Serow Capricornis sumatraensis in Virachey
National Park, northeastern Cambodia
Gregory McCann 1,
Keith Pawlowski 2 & Thon Soukhon 3
1 Chang Gung University, 259 Wenhua 1st Road, Taoyuan City, English Division, 33375,
Taiwan.
2 State University, 12 Capen Hall, Buffalo, New York 14260-1660, USA.
3 Department of Environment, Ratanakiri province, Virachey
National Park Office, Ban Lung, Cambodia.
1 gmccann1@cgu.edu.tw
(corresponding author), 2 keith.pawlowski716@gmail.com, 3 khonvnp.kh@gmail.com
Abstract: The Mainland Serow
Capricornis sumatraensis
is an under-studied, enigmatic rupicarin in the
family Bovidae that lives in remote parts of the
interior of Cambodia’s mountain ranges, most of which border neighboring countries. Their population status in Cambodia
is unclear but thought to be in decline. Our records stem from steep forested
areas and never in open meadows or clearings. Our fairly robust camera trap
records, including direct observations, suggest that Virachey
National Park in the northeastern corner of the
country might be the species’ last best chance for survival in the wild in
Cambodia.
Keywords: Bovidae,
camera-trapping, Indochina, Mainland Serow, poaching,
threats.
Editor: David Mallon, Manchester
Metropolitan University, Manchester, UK. Date
of publication: 26 June 2022 (online & print)
Citation: McCann, G., K. Pawlowski & T. Soukhon
(2022). The occurrence of
Indochinese Serow Capricornis
sumatraensis in Virachey
National Park, northeastern Cambodia. Journal of Threatened Taxa 14(6): 21149–21154. https://doi.org/10.11609/jott.7761.14.6.21149-21154
Copyright: © McCann et al. 2022. Creative Commons Attribution 4.0 International
License. JoTT
allows unrestricted use, reproduction, and distribution of this article in any
medium by providing adequate credit to the author(s) and the source of
publication.
Funding: Initial funding was supplied by the NGO Habitat ID. Apart from that, this was a self-funded study.
Competing interests: The authors declare no competing interests.
Author
details: Gregory Mccann is an Assistant Professor at Chang Gung University in
Taiwan who obtained a PhD focusing on Ecocriticism at Tamkang
University in Taiwan. He initiated the Virachey
National Park (VNP) wildlife survey in 2014 after completing his doctoral
research on traditional animism in the villages in the buffer zone of VNP. He
has also organized and led a multi-year wildlife survey in Sumatra, Indonesia,
in search of orangutans and tigers. He was responsible for fundraising,
organizing the expeditions, and selecting the survey sites in the park. Keith Pawlowski is an independent
researcher who obtained his MS from SUNY Buffalo State College in Great Lakes
Ecology. In addition taking part in the survey expeditions, he organized the
data collected from the camera traps, and co-wrote the manuscript. Thon Soukhon
is the Deputy Director of VNP and has worked for VNP for nearly 20 years,
beginning as an ecotourism ranger and then progressing into management
positions.
Author
contributions: GM
and KP collected data in the field and wrote the manuscript; TS permitted the
trek, reviewed data, and assisted with all organizational aspects of the
expedition.
Acknowledgements: The authors would like to thank
the Ministry of Environment of Cambodia and the Department of Environment of Ratanakiri Province, Cambodia, for their generous
cooperation and permission to conduct the survey.
Introduction
Not much is
known of the life habits and ecology of the four serow
species, which are found from the Indonesian island of Sumatra, across mainland
southeastern Asia and the Himalaya, and on the
islands of Japan and Taiwan. The status of the Serow
in Cambodia has long been poorly understood, and their behavior
is not well known (Lovari et al. 2020). In this paper
we describe the Mainland Serow Capricornis
sumatraensis (which some refer to as a
sub-species called Indochinese Serow Capricornis sumatraensis
milneedwardsii) records from Cambodia’s Virachey National Park (VNP), in the northeastern
corner of the country. This region is mountainous and forested, with peaks
reaching up to 1,500 m, and is characteristic of the serow’s
preferred habitat (Mori et al. 2019; Phan et al. 2020). The only other regions
of Cambodia that are confirmed to hold serow are the
Cardamom Mountains in the southwestern corner of the country (N. Marx pers.
comm. 2021), and Ko
Seima Wildlife Sanctuary (Griffin 2019)—all locations
with mountains that reach over 1,000 m. It is possible that serow
occur in the Dangrek Mountains that serve as the
northern boundary between Cambodia and Thailand, but border tensions and
intensive illegal logging operations have deterred most researchers from
entering the area. The last serow of the Phnom Tnout Wildlife Sanctuary in Preah Vihear
province was snared in 2008 (N. Marx pers. comm. 2021), but there are anecdotal
reports that some serow persist on the Phnom Tbeng plateau, also in Preah Vihear
province in the north of the country. Overall, the serow
occurs in the high mountainous segments that in places separate Cambodia from
Thailand, Laos, and Vietnam, and their numbers are in decline due to hunting
and habitat loss.
Although
there has been a debate regarding the classification of the serow
species, in particular whether the Mainland and Indochinese Serows
are separate species, it is distinct from the Sumatran Serow
Capricornis sumatraensis,
we regard the species found in VNP and throughout Cambodia as well as in
Thailand, Laos, and Vietnam, as belonging to Capricornis
sumatraensis or Mainland Serow,
which is consistent with the recent classification by Mori et al. (2019).
Other serow species, such as Japanese Serow Capricornis crispus, Taiwan Serow Capricornis swinhoei, and
the Myanmar-China Red Serow Capricornus rubidus are clearly different in appearance. It is not
within the scope of this paper to attempt a clarification of the classification
of the species and sub-species.
We found
Mainland Serow at many of our high elevation camera
stations, and a young specimen was observed and photographed by a park ranger
in the Yak Yeuk Grasslands area of VNP wandering
alone in a rocky and semi-forested section of the meadows in 2018 (S. Leam pers comm. 2021). Interestingly, we never camera-trapped serow at any of our open grassland camera stations, but
only in the high mountains in closed forest canopy, many days’ walk from the
nearest village, so the ranger sighting might be an anomaly. In the Khmer
language, the species is called “sat kɛh” (សត្វកែ), which
correlates with Indochinese Serow, and that is also
what our guides and porters call them. Recent DNA analysis has determined that
outside of Japan and Taiwan, serows belong to the
same species Capricornis sumatraensis (Mori et al. 2019). Visibly, there is
little or nothing to distinguish between serows from
Sumatra or mainland southeastern Asia, while the
species from Japan and Taiwan are distinctly different. We have camera-trapped serows in Sumatra, Thailand, and Cambodia, and can see no
discernible difference between them.
Serows appear to be in decline because of hunting for its horns and meat for
Asian pharmacopeia, evident by the photographs which have appeared in the
conservation NGO Wildlife Alliance’s monthly reports. This paper attempts to
help fill that knowledge gap by noting the serow
distribution in VNP.
Study
site
VNP is
located in northeastern Cambodia along the
mountainous international borders with Laos and Vietnam. The park covers an
area of 3,325 km². Most of Cambodia is very flat, which is unsuitable terrain
for all serow species, as they prefer mountainous
habitats (Francis 2019; Phan et al. 2020). Several extensive grasslands dot
VNP, and the park is extremely hilly and cut by deep river valleys. Access to
its remote points near the border with Laos was, until quite recently, very
difficult, but motorbike tracks blazed for selective logging have made access
easier, something which may spur additional hunting in previously difficult to
reach regions of VNP.
Our three
study sites in the park were chosen due to their distance from villages and
their apparent high quality forest cover based on satellite imagery. Many of
the mountains which form the wild and unmarked border between VNP (Cambodia)
and Laos are steep, heavily forested, and reach up to and over 1,000 m, making
it prime serow habitat. Our three study areas are
known as the Veal Thom Grasslands, Yak Yeuk
Grasslands, and T’buen Mountain.
Materials
and methods
This was a broad wildlife survey,
where camera traps were placed in a variety of habitats. Cameras were set along
forest paths, ridge lines, game trails, basaltic clearings, streams, and
wallows in order to maximize effort and the chances of encountering different
species. We also relied heavily on the knowledge of the park rangers and our
guides for camera placement. Cameras were often placed in locations where signs
of wildlife were observed. Due to our camera deployment methodology, some
species may be either over or underrepresented. Site selection, often being on
or near game trails, may have influenced our capture rate of serow.
Camera trap stations, with one
camera per site, were set approximately 20–100 cm above the ground, depending
on slope and vegetation. All camera traps were set to be active for 24 hours
each day, and to record time, date, and temperature when triggered. Camera
traps from our three study areas were set for a combined total of 299,400 hours
or 12,475 camera trap nights. Out of 36 camera traps, 32 were set to photograph
mode, recording three pictures for every trigger event, at various time
intervals, ranging from 30 seconds to five minutes. Camera traps at wallows or
areas that showed signs of foraging were set at longer time intervals to
minimize the number of redundant photographs. Camera traps on game trails were
set at shorter intervals to maximize the number of records. The four camera
traps set to video recorded for one minute and restart after 1-minute interval
if motion was detected; the video would therefore record until the animal had
left the area. Encounters were defined as a single or series of photographs
separated by more than 30 minutes at the same camera trap location. Coordinates
and altitudes were recorded directly from a Garmin GPSMAP altimeter and a
base-map of Cambodia that was purchased from Aruna
Technologies in Phnom Penh. We used Bushnell HD Trophy Cams, Reconyx Rapidfire, Browning Strikeforce Pro XD, and Covert camera traps. Several camera
traps malfunctioned, and five were lost to theft or damaged by poachers. Camera
trap data were recorded and organized in MS Excel.
Serows in protected areas adjacent to
VNP
Serows have never been detected in the Siem Pang Wildlife Sanctuary due west of VNP (J. Eames pers comm. 2021), likely due to the flatter terrain. Direct
observations of serow were made by community patrols
in Vuen Sai-Siem Pang
National Park, which is adjacent to VNP to the south, but they were not
recorded in camera traps (V. Audibert pers comm. 2021), possibly suggesting that VNP is a
regional stronghold for the species, along with other habitats which form a
kind of semi-circular mountainous international barrier around Cambodia; it is
these mountainous barriers which serve as the habitat and likely final redoubt
for the serow in Cambodia. We recorded serow on the ridge line of Phnom Haling-Halang,
which serves as a natural boundary between Cambodia and Laos. The name of the
Lao area adjacent to VNP to the north is Nam Ghong
Provincial Protected Area (NGPPA), so it is plausible that serows
are found in this region of Laos because it contains a similar topography to
VNP.
Results
We recorded a total of 126
independent encounters, for an encounter rate of 1.01 over a period 12,475
camera trap nights (Table 1).
Serow triggered 24/36 (67%) of our
camera trap stations and were present in all three survey areas. Of the three
survey areas, the Veal Thom area had the highest number of independent
encounters and encounter rate (1.35), where it appeared on 12 of 22 camera
traps. Many of the encounters are likely the same individual, feeding or moving
past a given camera, as distinguishing characteristics were often difficult to
identify.
Sun Bears Helarctos
malayanus were seen at altitudes ranging
490–1,420 m and appeared at elevations over 1,000 m in 62% of camera-trap
occurrences (13 of 21). They were camera-trapped in evergreen, semi-evergreen,
mixed deciduous, and mixed-bamboo forest; in forested grassland corridors,
along riversides, & mud wallows; and were frequently encountered on well-traveled game trails. They were often captured in our
stream-placed cameras. Most individuals encountered appeared to be in good
health and none had evidence of snaring. All individuals photographed, except
for a mother and juvenile pair, were solitary.
Discussion
Serows were detected at all hours of
the day. In several photos they were pictured resting on the ground, while in
others they are seen feeding, crossing swift streams, walking on boulders, or
running. Similar to our records in Sumatra, serows
seemed unperturbed by camera traps and often spent extensive amounts of time
feeding in front of them, sometimes triggering several dozen photographs. Our
VNP records, however, are encouraging, as serow
appear on many of our camera stations, including some with young, and a direct
observation (also photographed) a young individual by itself.
Serows are in decline in the Cardamom
Mountains in the south-west of the country (N. Marx pers
comm. 2021), and due to their habitat requirements—steep, heavily forested
mountains—it is difficult to surmise that they are found anywhere else in
Cambodia outside of what is likely a very small population in Ko Seima Wildlife Sanctuary in Mondulkiri province. To the best of our knowledge, no
recent records stem from Bokor National Park or from
Phnom Kulen National Park—two locations with montane
forest which could possibly support serow. Also to
the best of our knowledge no recent records stem from the Dangrek
Mountain chain on the Cambodian side. This scarcity of knowledge is mainly due
to a tense military standoff between Thailand and Cambodia and the illicit
trade in Siamese Rosewood in which Khmers illegally cross into Thailand to
poach the highly sought-after hardwood, often resulting in violent
confrontations between Thai security forces and Cambodian loggers (Stokes
2017). All border areas between Cambodia and Thailand are now off-limits due to
the fast spread of Covid-19 in Thailand, so it will be some time before any
information can be gathered from the Cambodian side of the Dangrek
mountains and other mountainous border areas. Therefore, it is very likely that
VNP represents the greatest stronghold for the species in Cambodia.
Elsewhere in the region, limited
data from Thailand’s National Parks website pinpoints Indochinese Serow occurrence in the Dangrek
Mountains right on the Thailand-Cambodian border (www.thainationalparks.com),
but just how up-to-date and accurate this information is, is open to question.
Across Thailand, serow appear to be widespread and
abundant (T. Redford pers. comm. 2021), and we camera trapped them in Khlong Saeng Wildlife Sanctuary in southern Thailand in 2014 during
a short pilot survey. Their status in Laos is unclear, though very heavy
hunting and particularly snaring pressures are prevalent throughout the country
(DeBuys 2015), as is from neighboring
Vietnam, which would indicate population declines, possibly very drastic.
However, there is a semi-wild rescue center for them
at Phong Nha Ké Báng National Park (Tri pers.
comm. 2021) which offers some hope for the species in Vietnam; their status in
wild throughout the rest of the country is not well known, but likely in steep
decline.
The serow’s
main predators in VNP are dholes Cuon alpinus, Clouded Leopards Neofelis
nebulosa, and humans, with the latter likely
representing by far the most serious threat, as Cambodia is in the midst of a
snaring epidemic (Gray et al. 2018). A recent study
targeted at VNP’s wild cats found that Clouded Leopards are still present in
VNP (McCann et al. 2020). Dholes were also detected in that survey, but a study
on Dhole diet and prey selection noted that serow
represented just 6% of Dholes consumed biomass in Cambodia, perhaps due to the serow’s preference for steep terrain, making it more
difficult for dholes to hunt them (Kamler et al.
2020).
Overall, the Mainland or Sumatra Serow is an under-studied bovine deserving more directed
conservation attention, or it could soon go the way of the Saola
Pseudoryx nghetinhensis
of the Annamite Mountains of Laos and
Vietnam—becoming extremely rare, and possibly extinct. As such, VNP offers one
of its last best hopes for survival in the wild, especially in Indochina
(Cambodia, Laos, and Vietnam). It is probably not too late to turn the
situation around for serows in Cambodia, but as
stated previously they do not garner significant conservation attention. We
hope that this publication can help raise an alarm and bring attention and
conservation management for the species where it still occurs.
Table 1. Serow
encounter rates recorded in Virachey National Park.
Encounter rate was calculated as independent encounters/100 camera trap nights.
Encounter rates at each survey location; Yak Yeuk,
Veal Thom and T’buen are represented as YY, VT, Tb,
respectively.
Common name |
Species |
Total encounters |
Encounter rate (YY, VT, Tb) |
Total encounter rate |
Mainland Serow
|
Capricornis sumatraensis |
126 |
0.45, 1.35, 0.42 |
1.01 |
Number of encounters (YY, VT, Tb)
of C. sumatraensis = 10, 106, 10
Total camera trap nights =
12,475.
Total camera trap nights per area
(YY, VT, Tb) = 2,242, 7,865, 2,368
For figure &
images - - click here for full PDF
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