Journal of Threatened Taxa | www.threatenedtaxa.org | 26 August
2019 | 11(10): 14292–14300
First
videos of endemic Zanzibar Servaline Genet Genetta servalina archeri, African Palm Civet Nandinia
binotata (Mammalia: Carnivora: Viverridae) and other small carnivores on Unguja Island, Tanzania
Helle V. Goldman 1 &
Martin T. Walsh 2
1 Norwegian
Polar Institute, Fram Centre, PO Box 6606 Langnes, NO-9296 Tromsø, Norway.
2 Wolfson College, University of Cambridge, Barton Road,
Cambridge, CB3 9BB, UK.
1 goldman@npolar.no
(corresponding author), 2 martin.walsh@cantab.net
Abstract: The faunal diversity of the densely populated island
of Unguja, Zanzibar archipelago, Tanzania, includes
several endemic mammals. Camera-trapping
in Jozani-Chwaka Bay National Park and Kiwengwa–Pongwe Forest Reserve in
September 2017 captured the first video footage of the Zanzibar Servaline Genet Genetta
servalina archeri, an
endemic subspecies first formally described in 1998. Other native small carnivores were also
recorded on video for the first time during this survey, including the African
Palm Civet Nandinia binotata,
which was first documented in print as present in Unguja
in 2004. Also camera-trapped in 2017
were the Zanzibar Slender Mongoose Herpestes
sanguineus rufescens
and the Zanzibar Bushy-tailed Mongoose Bdeogale
crassicauda tenuis. Follow-up camera-trapping in Jozani-Chwaka Bay National Park in August 2018 captured
additional video of the Zanzibar Servaline Genet and
the African Palm Civet. No images were
obtained of the African Civet Civettictis civetta, or of the two introduced species—the Banded
Mongoose Mungos mungo and the Small
Indian Civet Viverricula indica—in either year.
As the remaining natural habitat in Zanzibar shrinks in size and becomes
fragmented, it is increasingly urgent to document the archipelago’s carnivores
and other fauna, so that sound conservation measures can be implemented.
Keywords: Bdeogale crassicauda,
Bushy-tailed Mongoose, Herpestes sanguineus, Slender Mongoose, Tanzania, Zanzibar.
Swahili
abstract: Mfumo bioanuwai wa Kisiwa cha Unguja,
kilichopo katika funguvisiwa vya Zanzibar,
Tanzania, una idadi kubwa ya watu
na baadhi ya aina za
wanyama ambao hawapatikani mahali pengine popote. Kamera zilizotegwa mwezi wa tisa
2017 katika Hifadhi ya Taifa Jozani-Chwaka
Bay na Msitu wa Hifadhi Kiwengwa-Pongwe
zimemnasa ushundwi (aina ya kanu)
Genetta servalina archeri kwa
mara ya kwanza katika video. Ushundwi ni spishi ndogo
anayepatikana Unguja pekee; alitangazwa kisayansi kwa mara
ya kwanza mwaka wa 1998. Wanyama mbua wengine wadogo waliorekodiwa pia kwa mara ya kwanza katika uchunguzi wa 2017 walikuwa ni fungo-miti Nandinia binotata, mnyama
ambaye upatikanaji wake Unguja umeelezwa kwa mara ya
kwanza 2004, kicheche aina ya Herpestes sanguineus rufescens na
kitu (kwa jina la kisiwani) Bdeogale crassicauda tenuis. Video nyingine za ushundwi na
fungo-miti zimechukuliwa ndani ya Hifadhi
ya Jozani mwezi wa nane
2018. Picha za ngawa (kwa jina
la kisiwani) Civettictis civetta, na spishi mbili za
kigeni – nguchiro Mungos mungo na fungo (kwa
jina la kisiwani) Viverricula indica – hazikupatikana
katika unasaji wa video wa mwaka
2017 na pia 2018. Kwa kuwa misitu ya asili
ya Zanzibar inazidi kupungua na kubaki
visehemu sehemu chache, ni muhimu
zaidi kutafiti na kuandika habari
za wanyama mbua na wanyama
wengine visiwani, ili hatua madhubuti
za uhifadhi wanyama hao kutoweka
kabisa ziweze kuchukuliwa.
doi: https://doi.org/10.11609/jott.4729.11.10.14292-14300
|
ZooBank: urn:lsid:zoobank.org:pub:F7754DB7-2B05-451A-8C2D-8A841628E488
Editor: Kristofer Helgen,
University of Adelaide, Australia. Date
of publication: 26 August 2019 (online & print)
Manuscript details: #4729 | Received 21 February
2019 | Final received 01 August 2019 | Finally accepted 11 August 2019
Citation: Goldman, H.V. & M.T. Walsh (2019). First videos of endemic Zanzibar
Servaline Genet Genetta servalina archeri, African
Palm Civet Nandinia binotata
(Mammalia: Carnivora: Viverridae) and other small
carnivores on Unguja Island, Tanzania. Journal of Threatened Taxa 11(10): 14292–14300. https://doi.org/10.11609/jott.4729.11.10.14292-14300
Copyright: © Goldman & Walsh 2019. Creative Commons Attribution 4.0
International License. JoTT allows unrestricted use, reproduction, and
distribution of this article in any medium by adequate credit to the author(s)
and the source of publication.
Funding: Self-funded.
Competing interests: The authors declare no competing
interests.
Author details:
Dr Helle V. Goldman is Chief
Editor of Polar Research, the
Norwegian Polar Institute’s peer-reviewed journal. Her doctoral study, in anthropology, took place in 1992–93 on the Tanzanian island
of Pemba, where she recently returned
to investigate family
histories. She has been researching
wildlife on Unguja intermittently since 1996. Dr Martin T. Walsh is a Senior Member of Wolfson College in the University
of Cambridge. His current research focuses on the cultural and natural
history of the Zanzibar archipelago and the wider western Indian Ocean region.
Author contribution: Both authors took part in the fieldwork in
2017. HVG carried
out the fieldwork in 2018. Both authors
analyzed the data and interpreted the results. MTW conceived the idea for
the paper, HVG wrote the initial draft, MTW gave critical input, and the authors revised
it together prior to submission and
also following its review. Both HVG
and MTW approve the published version
of the article.
Acknowledgements:
For facilitating our work in 2017
and 2018, we would like to express our gratitude to Soud
Mohammed Juma, Director of the Department of Forestry
and Non-renewable Natural Resources, and – at JCBNP – Head Park Warden Ali Ali Mwinyi, Ecologist and
Assistant Park Warden Mzee Khamis Mohammed, Senior
Forest Guard Vuai Ramadhan, former Senior Forest
Guard Shabani Imani Ali, Ecology Officer Habib Abdulmajid Shaban, the forest guides and other staff, and –
at KPFR -– Forest Reserve Head Salim Ali and Station Assistant Hamisi Omar. We
would especially like to thank Mzee Khamis Mohammed
for setting out and collecting the camera trap on two days in August 2018. We are also grateful to Hot Snakes Media
for providing the cameras used in 2017, to Javed
Jafferji and David Alex of Gallery Tours, and, in
particular, to Seif Mbaruk
and Salmin Haji, our tireless drivers and general
problem-fixers. Mohammed Ayoub and his
assistants at ZALA Park are thanked for their generosity. Asha Fakhi Khamis and Ahmad Kipacha
kindly helped with the Swahili translation of the abstract; we are responsible
for any errors it may contain.
Introduction
The island of Unguja, in the
Zanzibar archipelago, hosts several native carnivore species (Kingdon 1977; Pakenham 1984; Kingdon
& Howell 1993; Van Rompaey & Colyn 1998; Perkin 2004).
Three of these are considered endemic subspecies, namely, the Zanzibar
Slender Mongoose Herpestes sanguineus rufescens, the
Zanzibar Bushy-tailed Mongoose Bdeogale crassicauda tenuis, and the Zanzibar Servaline Genet Genetta
servalina archeri,
which was first formally described in 1998 (Van Rompaey
& Colyn 1998).
The remaining two native carnivores on Unguja
are the African Civet Civettictis civetta, which is the island’s largest extant wild
carnivore, and the African Palm Civet Nandinia
binotata.
The latter was first observed by a biologist during a survey in 1998–99
and noted as a possible endemic subspecies (Perkin 2004).
The density of the human population of Zanzibar is
about 400 per km2 and as the number of people expands by about 3%
per year, 1.2% of the archipelago’s forests is lost annually to cultivation and
wood extraction for firewood, charcoal production, and building materials (Siex 2011). This
lends urgency to investigating the islands’ fauna, particularly species at
higher trophic levels. Mammalian
carnivores, including small-bodied carnivores, may be particularly vulnerable
to habitat fragmentation and loss (Di Minin et al.
2016). Though Unguja’s
natural habitat is diminishing, two elusive species previously not documented
on the island were found there in the fairly recent past, as noted above.
The camera-trapping work reported here was undertaken
opportunistically, alongside other research and with limited time and
equipment, with the objective of obtaining further photographic documentation
of Unguja’s carnivores 14 years after camera-trapping
in some of the same areas by one of the authors (Goldman & Winther-Hansen 2003a, b) and six years after a much larger
scale camera-trapping survey carried out by other researchers (Siex 2011).
Study areas
Zanzibar forms part of Conservation International’s
Coastal Forests of Eastern Africa Hotspot (Critical Ecosystem Partnership Fund
2016). We set camera-traps in two of Unguja’s protected areas: Jozani-Chwaka
Bay National Park (JCBNP) and Kiwengwa–Pongwe Forest Reserve (KPFR) (Fig. 1).
JCBNP (ca. 6.183–6.291 0S, 39.375–39.443 0E)
encompasses the island’s only remaining natural, old-growth forest (Robins
1976; Williams et al. 1998; Box 5.5.4 in Rodgers & Burgess 2000) as well as
a mosaic of other habitats, including scrub forest, bracken fields, saltmarsh
grassland, and mangrove forests. Most of
the park’s 50km2 is covered by high and low scrub forest (also known
as coral rag forest (Siex 2011)) on ground
characterized by numerous outcroppings of fossilized coral (Image 1a). The scrub forest comprises such species as Euclea racemosa, Polysphaeria parvifolia,
Pachystela brevipes,
Maytenus mossambicensis,
Searsia natalensis,
Macphersonia gracilis,
Annona senegalensis, and Flueggea virosa (Leskinen et al.
1997). This vegetation cover is
classified as Eastern African Coastal Scrub Forest, in Clarke’s scheme (Clarke
2000). Some 4km2 of the park
is groundwater forest that floods during the annual heavy rains and is
dominated by Eugenia sp. and Calophyllum
inophyllum, with Pandanus rabaiensis, Vitex doniana,
and Elaeis guineensis
as subdominants (Robins 1976; Beentje 1990; Burgess
et al. 1992; Nahonyo et al. 2002). This part of the park can be classed as
coastal riverine/swamp/groundwater forest in Clarke’s classification scheme
(Clarke 2000). Contiguous with the natural old-growth forest is a former Calophyllum inophyllum
plantation (Image 1b).
KPFR (ca. 5.924–6.041 0S, 39.33–39.403 0E)
is about 31km2 in size and is covered by high and low scrub forest,
as described above. Camera-traps were
placed in the low scrub forest near the Mchekeni
caves.
In September 2017, temperatures on Unguja
were between 20°C and 32°C. In August
2018, temperatures ranged from 21°C to 30°C.
Humidity varies between 75% and 83%.
The island receives about 1,575mm of rain annually. Most precipitation falls during rainy seasons
in November–December and March–May.
During our survey, there were occasional showers. In August, the sun rises at about 06.30h and
sets at about 18.24h EAT. In September,
the sun rises at about 06.16h and sets at about 18.20h EAT.
Methods
Between 3 and 15 September 2017, 10 Bushnell Trophy
Cam camera-traps were set in JCBNP and KPFR together with bait to attract the
island’s native carnivore species: the Zanzibar Servaline
Genet, the African Palm Civet, the African Civet, the Slender Mongoose, and the
Bushy-tailed Mongoose. Most of these
species had previously been camera-trapped near JCBNP forestry headquarters and
in the scrub forest several kilometres to the north,
so we set up the traps in those areas.
We did not set the traps at pre-set points on a grid or along transects
because we were not attempting to estimate population density and did not have
the time and resources to do so.
Not all cameras were active for the entire survey
period in 2017. Multiple traps were set
up at most stations. Counting multiple traps at a single station as a single
trap, the number of trap nights in 2017 at JCBNP was 30 and at KPFR nine.
Between 04 and 12 August 2018, a single Bushnell
Trophy Cam camera-trap was set in JCBCP (at different locations) for seven trap
nights.
Results
In 2017, the Zanzibar Servaline
Genet was camera-trapped at four plantation forest stations and three scrub
forest stations in JCBNP and at one scrub forest station in KFPR (Image 2; Video 1). The
proximity of the plantation forest stations makes it possible for the same
individual Servaline Genet to be camera-trapped at
several of these stations. It is likely
that the patterns of dark markings on the pelage of Servaline
Genets permit individual identification, as has been done in capture–recapture
studies of such species as Tiger (Panthera tigris; e.g., Karanth 1995)
and Jaguar (Panthera onca;
e.g., Silver et al. 2004). Although this
would have allowed us to determine how many individual Servaline
Genets visited the plantation forest trap stations, it proved difficult to
reliably compared images of pelage patterns on account of the different body
positions of the animals vis-à-vis the cameras.
Servaline Genets were mostly camera-trapped during the dark
hours of the night in 2017, although one individual was camera-trapped in scrub
forest habitat in JCBNP in daylight at 08.45h and at 17.48h.
Camera-trap videos of Servaline
Genets in 2017 show individuals engaged in behaviours
such as ascending and descending a tree, auto-grooming, and rolling on the
ground. In one video, a Servaline Genet is chased by a Northern Giant Pouched Rat Cricetomys gambianus cosensi (Image 3).
The alarm calls of Zanzibar Sykes’s Monkey Cercopithicus
mitis albogularis and Red Bush Squirrel Paraxerus palliatus frerei were also captured on video in connection with
the presence of a male Servaline Genet at one scrub forest station in JCBNP.
In 2017, the African Palm Civet was camera-trapped in
the JCBNP at two scrub forest stations.
Palm Civets were camera-trapped exclusively at night, in trees and on
the ground. In 2018, the Zanzibar Servaline Genet was camera-trapped at one scrub forest
station and one plantation forest station and the Palm Civet was camera-trapped
at one plantation forest station (Image 4).
Camera-trapping revealed as many as three species of
carnivores—Servaline Genet, Palm Civet, and
Bushy-tailed Mongoose—visiting a single scrub forest or plantation forest
station during the course of a night.
They did not overlap on film, suggesting that they avoid one
another. The only exception was when a
Bushy-tailed Mongoose Bdeogale crassicauda tenuis and a Palm Civet visited a station
at the same time (Image 5). At two
sites, adult Bushy-tailed Mongooses were camera-trapped in pairs.
The Zanzibar Slender Mongoose (Herpestes
sanguineus rufescens)
was camera-trapped—on both the ground and a tree branch, exclusively during
daylight—in 2018 but was not camera-trapped in 2017. A Slender Mongoose was observed (by MTW)
crossing a dirt road in a cultivated area on the western periphery of Zanzibar
Town during the survey in 2017.
The African Civet was the only native species of
extant carnivore that was not camera-trapped during either of the surveys. It is the largest of the island’s surviving
wild carnivores.
In addition to the carnivores that were
camera-trapped, the following mammals appeared in the images: Zanzibar Sykes’s
Monkey Cercopithicus mitis albogularis, Zanzibar Four-toed Sengi Petrodromus tetradactylus
zanzibaricus, Black and Rufous Sengi Rhynchocyon petersi,
Red Bush Squirrel Paraxerus palliatus frerei and, as
already mentioned, Northern Giant Pouched Rat Cricetomys
gambianus cosensi. Unidentified bats and a pair of unidentified
small arboreal rodents also made appearances.
Outside of the protected areas, near the settlement of Kitogani, Greater Galago Otolemur
garnettii garnettii and
the Zanzibar subspecies of the Tanzania Dwarf Coast Galago Galagoides
zanzibaricus zanzibaricus
were camera-trapped in the same tree at different times.
Discussion
The Zanzibar Servaline Genet
was first described in a 1998 publication on the basis of a single skull and
damaged skin that came to the attention of a naturalist in 1995 (Van Rompaey & Colyn 1998). No documented scientific observations of the Servaline Genet were made until the animal was
camera-trapped in 2003 (Goldman & Winther-Hansen
2003a,b, 2007; Goldman et al. 2004). Servaline Genets were also camera-trapped on Unguja during a survey that lasted from 2008 to 2011 and
comprised 316 trap stations and 4,335 trap days (Siex
2011). That study extended the
documented range of this species—described as “geographically isolated in Jozani forest” (Van Rompaey &
Colyn 2013)—to the corridor between KPFR and JCBNP in
the north and, in the south, to the southernmost part of Unguja
(Siex 2011).
Our own camera-trapping has pushed the Zanzibar Servaline
Genet’s known range further north, into KPFR.
Servaline Genets are widely distributed in central Africa, from
the coasts of Cameroon, Equatorial Guinea, Gabon, and Congo, eastward through
Uganda, Rwanda, and Burundi and the wet forests of western Kenya (Van Rompaey & Colyn 2013) (Image
1a). East of this they are confined to
small areas of forest in Tanzania’s Eastern Arc Mountains and the forests of Unguja (Cordeiro & Seltzer
2012; Van Rompaey & Colyn
2013 and references therein) (Image 1b).
The isolation of these pockets hints that the former range of the Servaline Genet in the easternmost part of the continent
has undergone severe constriction with climatic and vegetation changes. The extent to which the Zanzibar Servaline Genet may be specially adapted to drier coastal
forest is yet to be investigated.
The presence of the African Palm Civet on Unguja first came to light when the species was observed,
and subsequently live-trapped, during a survey of nocturnal mammals (primarily galagos) in 1998–99 (Perkin 2004). It was not
camera-trapped during the large-scale survey of 2008–2011 (Siex
2011).
In mainland Africa, the distribution of the African
Palm Civet largely overlaps that of the Servaline
Genet, extending from the Senegambian coast in the west to the coast of
Tanzania in the east (Gaubert et al. 2015) (Image
1a). Regarding the African Palm Civet on
Unguja, Perkin observed that “more research may show
this population of N. binotata to be a
distinct subspecies because of the effects of isolation of Unguja
Island from the mainland” (Perkin 2004).
The separation occurred some
eight or nine thousand years ago (Prendergast et al. 2016).
The recent scientific discovery of the Servaline Genet and the African Palm Civet in Unguja is notable given the high density of the human
population (400 individuals/km2) and the small size of the island
(1,650km2). When the
camera-trapped images of the Servaline Genet and the
Palm Civet were shown to Zanzibaris in and around JCBNP, they were familiar
with the former, a nocturnal predator with a reputation for killing large
numbers of chickens in henhouses and leaving the majority of them unconsumed. In contrast, almost all Zanzibaris who
examined our African Palm Civet images professed never to have seen it before,
in life or in photographs. This attests
to the elusiveness of this species on Unguja.
Pairs of apparently full-grown Bushy-tailed Mongooses
were camera-trapped at two locations.
According to Taylor (2013), this mongoose is “primarily solitary”,
although females accompanied by young may be expected. On Unguja,
Bushy-Tailed Mongooses are known for carrying Giant African Land Snails Achatina spp. to rocks against which
the shells are cracked. Broken snail
shells accumulate around favoured rocks.
It is noteworthy that images of the African Civet, the
island’s largest extant carnivore, were obtained during camera-trapping in 2003
(Goldman & Winther-Hansen 2003a,b, 2007) and in
2008–2011 (Siex 2011) but not in 2017 or 2018. Zanzibaris residing in the vicinity of JCBNP
believe that the African Civet population has been much reduced in recent
years. Hunting for sport and, in some
cases, human consumption is said to be the cause. According to local informants, this is a new
phenomenon on the island as African Civets are not part of the traditional
diet.
Our camera-trapping produced no evidence of the two
introduced species of small carnivore included by Pakenham (1984) in his work
based primarily on his own observations in Zanzibar in the 1930s and ‘40s. These species were the Banded Mongoose Mungos mungo, which Pakenham noted was
“seldom seen now”, and the Small Indian Civet Viverricula
indica, which was “common” and “frequently
observed in early morning or late evening in semi-open grassy areas or
woodland” (Pakenham 1984). Neither of
these species was camera-trapped in 2003 (Goldman & Winther-Hansen
2003a) nor in 2008–2011 (Siex 2011). We were told that both are still present in
cultivated areas on the western side of the island, but not in Jozani or on the east coast.
Conclusion
Although very little is known about the distribution
and population status of Zanzibar’s carnivores and other mammal species across
the islands of Unguja and Pemba, deforestation can be
considered a major threat to the wildlife of the archipelago. Within JCBNP, we saw ample evidence of
wood-cutting, poaching, and cattle-grazing in spite of the dedicated efforts of
the forestry staff, who work with very limited resources. We have donated camera-trapping equipment to
the Department of Forestry and Non-renewable Natural Resources and have trained
staff in its use. We have also
facilitated the department’s procurement of two unmanned aerial vehicles for
the purposes of forest monitoring.
Government resources should be allocated to support the vigorous
protection of Zanzibar’s forest reserves and singular national park, and
patches of community forest should be carefully managed to preserve habitat for
wildlife and to keep hunting to sustainable levels.
The mammalian fauna of Unguja
includes endemic taxa that may have been shaped by the founder effect, genetic
drift, and adaptation to the local environment as a result of climatic change
and isolation from the mainland following the end of the last ice age.
Palaeozoological research has demonstrated the extinction of several
species of mammals on the island (Prendergast et al. 2016). Though many Zanzibaris believe that the
island’s former apex predator, the Zanzibar Leopard Panthera
pardus adersi, may
still be present (Goldman & Walsh 2002; Walsh & Goldman 2012, 2017),
there is no recent physical evidence for its persistence. To our knowledge there are no verified still
or moving images of the Zanzibar Leopard in the wild, and we concur with the
international authorities (e.g., Hunter et al. 2013) who consider it to have
been extirpated. Unique island animals
are particularly vulnerable to extinction and every effort should be made to
ensure the survival in the wild of mammal populations in Zanzibar.
For
figure & images – click here
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