Abundance, demography, and harvesting of water snakes from agricultural landscapes in West Java, Indonesia
Mirza D. Kusrini A , Ramdani Manurung B , Fata Habiburrahman Faz B , Aristyo Dwiputro B , Arief Tajalli B , Huda Nur Prasetyo B , Pramitama Bayu Saputra B , Umar F. Kennedi B , Ditro Wibisono Parikesit C , Richard Shine D and Daniel Natusch
D *
+ Author Affiliations
- Author Affiliations
A Faculty Forestry & Environment, IPB University, Bogor 16680, Indonesia.
B Jaga Rimba Nusantara Foundation, Bogor 16001, West Java, Indonesia.
C Agraria dan Tata Ruang, Badan Pertanahan Nasional, Bogor 16128, Indonesia.
D School of Natural Sciences, Macquarie University, Sydney, NSW 2109, Australia.
Wildlife Research 50(4) 272-282 https://doi.org/10.1071/WR22079
Submitted: 10 May 2022 Accepted: 22 July 2022 Published: 8 November 2022
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Across much of its geographic range, the masked water snake, Homalopsis buccata, is harvested each year in large numbers, questioning the sustainability of that offtake.
Aims: To quantify abundance and demography of water snakes in anthropogenically disturbed habitats in an area of West Java, where these snakes are subject to intensive harvest.
Methods: We accompanied professional snake-collectors, and conducted our own surveys of ponds and irrigation canals, to record the numbers and attributes (species, sex, size, etc.) of snakes that were captured using a variety of methods.
Key results: Snakes of several species were abundant, with mean capture rates of 32 666 snakes km−1 of irrigation canals, and 57 501 snakes km−2 of fishponds (9500 and 43 788 for H. buccata alone). Sex ratios of H. buccata were female-biased in ponds but not irrigation channels. Ponds underlain by deeper mud contained more snakes. Collecting methods varied among habitat types, in a way that reduced collateral risk to commercially farmed fish in ponds.
Conclusions: These water snakes are extremely abundant in Java, despite high levels of historical and continuing harvest. The inference of low population sizes for H. buccata in Indonesia, as presented in the IUCN Red List, is erroneous.
Implications: An ability to utilise anthropogenic resource subsidies (in this case, fish farmed in village ponds) allows some native predator species to attain remarkably high abundances, and to withstand intense efforts at harvesting.
Keywords: aquatic habitat, conservation, density, Homalopsidae, predator–prey, puff-faced water snake, resource subsidy, sustainable offtake, wildlife management.
References
Allek, A, Assis, AS, Eiras, N, Amaral, TP, Williams, B, Butt, N, Renwick, AR, Bennett, JR, and Beyer, HL (2018). The threats endangering Australia’s at-risk fauna. Biological Conservation 222, 172–179.| The threats endangering Australia’s at-risk fauna.Crossref | GoogleScholarGoogle Scholar |
Badan Informasi Geospasial (2021) Irrigation canal data for West Java Province, Indonesia. Badan Informasi Geospasial. Available at https://www.big.go.id/. [Accessed June 2021]
Bergman, RAM (1951). The anatomy of Homalopsis buccata. Proceeding of the Koninklijke Nederlandse Akademie van Wetenschappen. Series C 54, 511–524.
Bernstein, JM, Murphy, JC, Voris, HK, Brown, RM, and Ruane, S (2021). Phylogenetics of mud snakes (Squamata: Serpentes: Homalopsidae): a paradox of both undescribed diversity and taxonomic inflation. Molecular Phylogenetics and Evolution 160, 107109.
| Phylogenetics of mud snakes (Squamata: Serpentes: Homalopsidae): a paradox of both undescribed diversity and taxonomic inflation.Crossref | GoogleScholarGoogle Scholar |
Berry, PY, and Lim, GS (1967). The breeding pattern of the puff-faced water snake, Homalopsis buccata Boulenger. Copeia 1967, 307–313.
| The breeding pattern of the puff-faced water snake, Homalopsis buccata Boulenger.Crossref | GoogleScholarGoogle Scholar |
Boeadi Boeadi (1998). Biology of the commercially harvested rat snake (Ptyas mucosus) and cobra (Naja sputatrix) in Central Java. Mertensiella 9, 99–104.
Bonebrake, TC, Guo, F, Dingle, C, Baker, DM, Kitching, RL, and Ashton, LA (2019). Integrating proximal and horizon threats to biodiversity for conservation. Trends in Ecology & Evolution 34, 781–788.
| Integrating proximal and horizon threats to biodiversity for conservation.Crossref | GoogleScholarGoogle Scholar |
Boult, VL, Fishlock, V, Quaife, T, Hawkins, E, Moss, C, Lee, PC, and Sibly, RM (2019). Human-driven habitat conversion is a more immediate threat to Amboseli elephants than climate change. Conservation Science and Practice 1, e87.
| Human-driven habitat conversion is a more immediate threat to Amboseli elephants than climate change.Crossref | GoogleScholarGoogle Scholar |
Brooks, SE, Allison, EH, and Reynolds, JD (2007a). Vulnerability of Cambodian water snakes: initial assessment of the impact of hunting at Tonle Sap Lake. Biological Conservation 139, 401–414.
| Vulnerability of Cambodian water snakes: initial assessment of the impact of hunting at Tonle Sap Lake.Crossref | GoogleScholarGoogle Scholar |
Brooks SE, Reynolds JD, Allison EA, Touch B (2007b) The exploitation of homalopsid water snakes at Tonle Sap Lake, Cambodia. In ‘Homalopsid Snakes: Evolution in the Mud’. (Ed. JC Murphy) pp. 31–38. (Krieger Publishing Company: Malabar, FL, USA)
Cavia, R, Muschetto, E, Cueto, GR, and Suárez, OV (2015). Commensal rodents in the city of Buenos Aires: a temporal, spatial, and environmental analysis at the whole city level. EcoHealth 12, 468–479.
| Commensal rodents in the city of Buenos Aires: a temporal, spatial, and environmental analysis at the whole city level.Crossref | GoogleScholarGoogle Scholar |
Cochran, C, Edwards, KL, Travis, ZD, Pompe, LR, and Hayes, WK (2021). Diet and feeding frequency in the southwestern speckled rattlesnake (Crotalus pyrrhus): ontogenetic, sexual, geographic, and seasonal variation. Journal of Herpetology 55, 77–87.
| Diet and feeding frequency in the southwestern speckled rattlesnake (Crotalus pyrrhus): ontogenetic, sexual, geographic, and seasonal variation.Crossref | GoogleScholarGoogle Scholar |
Fearn, S, Robinson, B, Sambono, J, and Shine, R (2001). Pythons in the pergola: the ecology of ‘nuisance’ carpet pythons (Morelia spilota) from suburban habitats in south-eastern Queensland. Wildlife Research 28, 573–579.
| Pythons in the pergola: the ecology of ‘nuisance’ carpet pythons (Morelia spilota) from suburban habitats in south-eastern Queensland.Crossref | GoogleScholarGoogle Scholar |
Goiran, C, Dubey, S, and Shine, R (2013). Effects of season, sex and body size on the feeding ecology of turtle-headed seasnakes (Emydocephalus annulatus) on IndoPacific inshore coral reefs. Coral Reefs 32, 527–538.
| Effects of season, sex and body size on the feeding ecology of turtle-headed seasnakes (Emydocephalus annulatus) on IndoPacific inshore coral reefs.Crossref | GoogleScholarGoogle Scholar |
IUCN (2021) The IUCN red list of threatened species. Version 2021-3. Available at https://www.iucnredlist.org/species/176682/7283049#conservation-actions. [Accessed 12 March 2022]
Jones, AR, Jessop, TS, Ariefiandy, A, Brook, BW, Brown, SC, Ciofi, C, Benu, YJ, Purwandana, D, Sitorus, T, Wigley, TML, and Fordham, DA (2020). Identifying island safe havens to prevent the extinction of the World’s largest lizard from global warming. Ecology and Evolution 10, 10492–10507.
| Identifying island safe havens to prevent the extinction of the World’s largest lizard from global warming.Crossref | GoogleScholarGoogle Scholar |
Karns, DR, Murphy, JC, Voris, HK, and Suddeth, JS (2005). Comparison of semi-aquatic snake communities associated with the Khorat Basin, Thailand. Tropical Natural History 5, 73–90.
Khadiejah S, Abu-Hashim AK, Musa FH, Abdul-Patah P, Abdul-Rahman MT, Ismail HI, Wahab A, Razak NA (2020) ‘Management and Trade in Asian Water Monitors (Varnanus salvator) in Peninsular Malaysia.’ (Department of Wildlife and National Parks Peninsular Malaysia (PERHILITAN): Kuala Lumpur, Malaysia)
Kusrini, MD, and Alford, RA (2006). Indonesia’s exports of frogs’ legs. TRAFFIC Bulletin 21, 13–24.
Lilley, G (1993). The use of reptiles as a product. The Reptilian Magazine 1, 12–14.
Lim FLK, Lee MTM (1989) ‘Fascinating Snakes of Southeast Asia – an Introduction.’ (Tropical Press: Kuala Lumpur, Malaysia)
Méndez, A, Montalvo, T, Aymí, R, Carmona, M, Figuerola, J, and Navarro, J (2020). Adapting to urban ecosystems: unravelling the foraging ecology of an opportunistic predator living in cities. Urban Ecosystems 23, 1117–1126.
| Adapting to urban ecosystems: unravelling the foraging ecology of an opportunistic predator living in cities.Crossref | GoogleScholarGoogle Scholar |
Murphy JC (2007) ‘Homalopsid Snakes: Evolution in the Mud.’ (Krieger Publishing: Malabar, FL, USA)
Murphy, JC, Voris, HK, Karns, DR, Chanard, T, and Suvurat, K (1999). The ecology of the water snakes of Ban Tha Hin, Songkhla Province, Thailand. Natural History Bulletin of Siam Society 47, 129–147.
Murphy, JC, Voris, HK, Murthy, BHCK, Traub, J, and Cumberbatch, C (2012). The masked water snakes of the genus Homalopsis Kuhl & van Hasselt, 1822 (Squamata, Serpentes, Homalopsidae), with the description of a new species. Zootaxa 3208, 1–26.
| The masked water snakes of the genus Homalopsis Kuhl & van Hasselt, 1822 (Squamata, Serpentes, Homalopsidae), with the description of a new species.Crossref | GoogleScholarGoogle Scholar |
Natusch, DJD, Lyons, JA, Mumpuni, , Riyanto, A, and Shine, R (2016). Jungle giants: assessing sustainable harvesting in a difficult-to-survey species (Python reticulatus). PLoS ONE 11, e0158397.
| Jungle giants: assessing sustainable harvesting in a difficult-to-survey species (Python reticulatus).Crossref | GoogleScholarGoogle Scholar |
Natusch, DJD, Lyons, JA, Riyanto, A, Mumpuni, , Khadiejah, S, and Shine, R (2019a). Detailed biological data are informative, but robust trends are needed for informing sustainability of wildlife harvesting: a case study of reptile offtake in Southeast Asia. Biological Conservation 233, 83–92.
| Detailed biological data are informative, but robust trends are needed for informing sustainability of wildlife harvesting: a case study of reptile offtake in Southeast Asia.Crossref | GoogleScholarGoogle Scholar |
Natusch DJD, Fitzgerald L, Lyons JA, Toudonou ASC, Miccuci P, Waller T (2019b) Harvest monitoring of snakes in trade – a guide for wildlife managers. Occasional Paper of the IUCN Species Survival Commission Number 65. (IUCN: Gland, Switzerland)
Natusch, DJD, Lyons, JA, Mumpuni, , Riyanto, A, and Shine, R (2020). Harvest effects on blood pythons in North Sumatra. The Journal of Wildlife Management 84, 249–255.
| Harvest effects on blood pythons in North Sumatra.Crossref | GoogleScholarGoogle Scholar |
Neel, LK, and McBrayer, LD (2018). Habitat management alters thermal opportunity. Functional Ecology 32, 2029–2039.
| Habitat management alters thermal opportunity.Crossref | GoogleScholarGoogle Scholar |
Nijman V (2013) One hundred years of solitude: effects of long-term forest fragmentation on the primate community of Java, Indonesia. In ‘Primates in Fragments’. (Eds LK Marsh, CA Chapman) pp. 33–45. (Springer: New York, NY, USA)
Powers, RP, and Jetz, W (2019). Global habitat loss and extinction risk of terrestrial vertebrates under future land-use-change scenarios. Nature Climate Change 9, 323–329.
| Global habitat loss and extinction risk of terrestrial vertebrates under future land-use-change scenarios.Crossref | GoogleScholarGoogle Scholar |
Saint Girons, H, and Pfeffer, P (1972). Notes sur l’ecologie des serpents du Cambodge. Zoologische Mededelingen 47, 65–87.
Shanida, SS, Partasasmita, R, Husodo, T, Parikesit, P, Febrianto, P, and Megantara, EN (2018). The existence of Javan leopard (Panthera pardus melas Cuvier, 1809) in the non-conservation forest areas of Cisokan, Cianjur, West Java, Indonesia. Biodiversitas Journal of Biological Diversity 19, 42–46.
| The existence of Javan leopard (Panthera pardus melas Cuvier, 1809) in the non-conservation forest areas of Cisokan, Cianjur, West Java, Indonesia.Crossref | GoogleScholarGoogle Scholar |
Shine, R, Harlow, P, Keogh, JS, Boeadi (1995). Biology and commercial utilization of acrochordid snakes, with special reference to Karung (Acrochordus javanicus). Journal of Herpetology 29, 352–360.
| Biology and commercial utilization of acrochordid snakes, with special reference to Karung (Acrochordus javanicus).Crossref | GoogleScholarGoogle Scholar |
Shine, R, Ambariyanto, , Harlow, PS, and Mumpuni, (1999). Reticulated pythons in Sumatra: biology, harvesting and sustainability. Biological Conservation 87, 349–357.
| Reticulated pythons in Sumatra: biology, harvesting and sustainability.Crossref | GoogleScholarGoogle Scholar |
Stuart, BL (2004). The harvest and trade of reptiles at U Minh Thuong National Park, southern Viet Nam. TRAFFIC Bulletin 20, 25–34.
Thiollay, J-M, and Meyburg, BU (1988). Forest fragmentation and the conservation of raptors: a survey on the island of Java. Biological Conservation 44, 229–250.
| Forest fragmentation and the conservation of raptors: a survey on the island of Java.Crossref | GoogleScholarGoogle Scholar |
Tingley, R, Macdonald, SL, Mitchell, NJ, Woinarski, JCZ, Meiri, S, Bowles, P, Cox, NA, Shea, GM, Böhm, M, Chanson, J, Tognelli, MF, Harris, J, Walke, C, Harrison, N, Victor, S, Woods, C, Amey, AP, Bamford, M, Catt, G, Clemann, N, Couper, PJ, Cogger, H, Cowan, M, Craig, MD, Dickman, CR, Doughty, P, Ellis, R, Fenner, A, Ford, S, Gaikhorst, G, Gillespie, GR, Greenlees, MJ, Hobson, R, Hoskin, CJ, How, R, Hutchinson, MN, Lloyd, R, McDonald, P, Melville, J, Michael, DR, Moritz, C, Oliver, PM, Peterson, G, Robertson, P, Sanderson, C, Somaweera, R, Teale, R, Valentine, L, Vanderduys, E, Venz, M, Wapstra, E, Wilson, S, and Chapple, DG (2019). Geographic and taxonomic patterns of extinction risk in Australian squamates. Biological Conservation 238, 108203.
| Geographic and taxonomic patterns of extinction risk in Australian squamates.Crossref | GoogleScholarGoogle Scholar |
Tweedie MWF (1954) ‘The Snakes of Malaya.’ (F. S. Horslin, Government Printer: Singapore)
Van Hoesel JKP (1959) ‘Ophidia Javanica.’ (Museum Zoologicum Bogoriense: Kebun Raya, Indonesia)
Voris, HK, and Murphy, JC (2002). The prey and predators of homalopsine snakes. Journal of Natural History 36, 1621–1632.
| The prey and predators of homalopsine snakes.Crossref | GoogleScholarGoogle Scholar |
White B (2019) Population, involution, and employment in rural Java. In ‘Agricultural and Rural Development in Indonesia’ (Ed. GE Hansen) pp. 130–146. (Routledge: London, UK)
Wilson, RC, LeMaster, MP, and Lutterschmidt, DI (2021). Exogenous leptin promotes reproductive behavior during aphagia in red-sided garter snakes (Thamnophis sirtalis parietalis). Hormones and Behavior 128, 104 893.
| Exogenous leptin promotes reproductive behavior during aphagia in red-sided garter snakes (Thamnophis sirtalis parietalis).Crossref | GoogleScholarGoogle Scholar |
