Free Standard AU & NZ Shipping For All Book Orders Over $80!
Register      Login
Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Saltwater crocodile (Crocodylus porosus) attacks in East Nusa Tenggara, Indonesia

Brandon Sideleau https://orcid.org/0000-0001-9145-6414 A E , Tamen Sitorus B , Dadang Suryana B and Adam Britton https://orcid.org/0000-0001-5953-3061 A C D
+ Author Affiliations
- Author Affiliations

A CrocBITE, PO Box 353, Humpty Doo, NT 0836, Australia.

B Directorate General of Nature Resources and Ecosystem Conservation, Ministry of Environment and Forestry of the Republic of Indonesia, Gedung Manggala Wanabakti, Block I, 8th Floor, Jalan Jenderal Gatot Subroto, Jakarta Pusat 10270, Jakarta, Indonesia.

C Research Institute for the Environment and Livelihoods, Charles Darwin University, NT 0810, Australia.

D Big Gecko Crocodilian Research, PO Box 353, Humpty Doo, NT 0835, Australia.

E Corresponding author. Email: bsideleau@gmail.com

Marine and Freshwater Research 72(7) 978-986 https://doi.org/10.1071/MF20237
Submitted: 4 August 2020  Accepted: 28 November 2020   Published: 8 February 2021

Abstract

Saltwater crocodiles (Crocodylus porosus) are extensively distributed throughout South-east Asia, including the Indonesian province of East Nusa Tenggara (ENT), and they account for hundreds of attacks on people annually. Recorded incidents not only tell us where crocodiles are found (useful when survey data are limited), but importantly can improve our understanding of causal factors to better address risk. We compiled public attack records for ENT on humans from 2009 to 2018 using an online database of incidents (CrocBITE), then worked closely with government representatives to visit human–crocodile conflict (HCC) hot spots, where some unreported attack records were collected, and local attitudes towards crocodiles could be assessed. Of the 100 attacks we compiled, 60% were fatal incidents. Most victims were male (84%) and most attacks (75%) occurred during fishing. West Timor had the highest proportion of attacks (70%). Cultural attitudes towards crocodiles were found to be generally positive throughout ENT, similar to neighbouring Timor-Leste, although recent media stories appear to have introduced some negative beliefs and fears. We recommend that resources and training are made available to improve local crocodile knowledge, including habitat surveys in proximity to conflict areas, plus community-based education where the risk of crocodile attack is high.


References

Amarasinghe, A. A. T., Madawala, M. B., Karunarathna, D. M. S. S., Manolis, S. C., de Silva, A., and Sommerlad, R. (2015). Human–crocodile conflict and conservation implications of saltwater crocodiles Crocodylus porosus (Reptilia: Crocodylia: Crocodylidae) in Sri Lanka. Journal of Threatened Taxa 7, 7111–7130.
Human–crocodile conflict and conservation implications of saltwater crocodiles Crocodylus porosus (Reptilia: Crocodylia: Crocodylidae) in Sri Lanka.Crossref | GoogleScholarGoogle Scholar |

Andi, S. (2019). BKSDA Akan Evakuasi Buaya yang Ditangkap Warga di Bawean. In BeritaGresik, 24 September 2019. Available at https://beritagresik.com/news/peristiwa/24/09/2019/bksda-akan-evakuasi-buaya-yang-ditangkap-warga-di-bawean.html [Verified 9 March 2020].

Asosiasi Penyelenggara Jasa Internet Indonesia (2017). Infografis Penetrasi & Perilaku Pengguna Internet Indonesia. (APJII.) Available at https://bit.ly/35Z8n83 [Verified 1 January 2021].

Asosiasi Penyelenggara Jasa Internet Indonesia (2018). Laporan Survei Penetrasi & Profil Perilaku Pengguna Internet Indonesia. (APJII.) Available at https://bit.ly/35Z8n83 [Verified 1 January 2021].

Bezuijen, M. R., Suryansyah, B., Huda, I., Pratjihno, P. S., Andriyono, S., Potess, L. F., and Sommerlad, R. (2005). False gharial (Tomistoma schlegelii) surveys in West Kalimantan, Indonesia in 2004. A co-operative project of the KSDA-West Kalimantan, CSG-TTF and PRCF. Crocodile Specialist Group Tomistoma Task Force: Frankfurt, Germany; and the People, Resources, and Conservation Foundation: Pontianak, Indonesia.

Bhatia, S., Redpath, S., Suryawanshi, K., and Mishra, C. (2020). Beyond conflict: exploring the spectrum of human–wildlife interactions and their underlying mechanisms. Oryx 54, 621–628.
Beyond conflict: exploring the spectrum of human–wildlife interactions and their underlying mechanisms.Crossref | GoogleScholarGoogle Scholar |

Boomgaard, P. (2007). Crocodiles and humans in Southeast Asia: four centuries of co-existence and confrontation. In ‘Environmental Challenges Across Asia’, 2 March 2007. Keynote Presentation. (Center for International Studies, University of Chicago: Chicago, IL, USA.) Available at http://chiasmos.uchicago.edu/media/enviro_boomgaard_512k.mov [Verified 29 January 2021].

Brackhane, S., Webb, G., Xavier, F. M. E., Gusmao, M., and Pechacek, P. (2018). When conservation becomes dangerous: human–crocodile conflict in Timor-Leste. The Journal of Wildlife Management 82, 1332–1344.
When conservation becomes dangerous: human–crocodile conflict in Timor-Leste.Crossref | GoogleScholarGoogle Scholar |

Britton, A. R. C., and Campbell, A. (2013). Croc attacks: a new website with bite. The Conversation, 3 December 2013. Available at https://theconversation.com/croc-attacks-a-new-website-with-bite-20671 [Verified 15 November 2020].

Britton, A. R. C., Whitaker, R., and Whitaker, N. (2012). Here be a dragon: exceptional size in a saltwater crocodile (Crocodylus porosus) from the Philippines. Herpetological Review 43, 541–546.

Buden, D. W., and Haglelgam, J. (2010). Review of crocodile (Reptilia: Crocodilia) and dugong (Mammalia: Sirenia) sightings in the Federated States of Micronesia. Pacific Science 64, 577–583.
Review of crocodile (Reptilia: Crocodilia) and dugong (Mammalia: Sirenia) sightings in the Federated States of Micronesia.Crossref | GoogleScholarGoogle Scholar |

Caldicott, D. G., Croser, D., Manolis, C., Webb, G., and Britton, A. (2005). Crocodile attack in Australia: an analysis of its incidence and review of the pathology and management of crocodilian attacks in general. Wilderness & Environmental Medicine 16, 143–159.
Crocodile attack in Australia: an analysis of its incidence and review of the pathology and management of crocodilian attacks in general.Crossref | GoogleScholarGoogle Scholar |

Campbell, H. A., Watts, M. E., Sullivan, S., Read, M. A., Choukroun, S., Irwin, S. R., and Franklin, C. E. (2010). Estuarine crocodiles ride surface currents to facilitate long-distance travel. Journal of Animal Ecology 79, 955–964.
Estuarine crocodiles ride surface currents to facilitate long-distance travel.Crossref | GoogleScholarGoogle Scholar |

Dflores (2014). Buaya tiwu rhewu. Dflores: Media Kawasan Pulau Flores, May–June. Available at https://issuu.com/majalahdflores/docs/dflores_perdana/23 [Veriifed 1 January 2021].

Evans, L. J., Jones, T. H., Pang, K., Saimin, S., and Goossens, B. (2016). Spatial ecology of estuarine crocodile (Crocodylus porosus) nesting in a fragmented landscape. Sensors 16, 1527.
Spatial ecology of estuarine crocodile (Crocodylus porosus) nesting in a fragmented landscape.Crossref | GoogleScholarGoogle Scholar |

Ezat, M. A., Fritsch, C. J., and Downs, C. T. (2018). Use of an unmanned aerial vehicle (drone) to survey Nile crocodile populations: a case study at Lake Nyamithi, Ndumo game reserve, South Africa. Biological Conservation 223, 76–81.
Use of an unmanned aerial vehicle (drone) to survey Nile crocodile populations: a case study at Lake Nyamithi, Ndumo game reserve, South Africa.Crossref | GoogleScholarGoogle Scholar |

Frazier, S. (2000). The crocodiles of Danau Sentarum, West Kalimantan. Borneo Research Bulletin 31, 307–322.

Fukuda, Y., Manolis, C., Saalfeld, K., and Zuur, A. (2015). Dead or alive? Factors affecting the survival of victims during attacks by saltwater crocodiles (Crocodylus porosus) in Australia. PLoS One 10, e0126778.
Dead or alive? Factors affecting the survival of victims during attacks by saltwater crocodiles (Crocodylus porosus) in Australia.Crossref | GoogleScholarGoogle Scholar | 26020948PubMed |

Grigg, G., and Kirshner, D. (2015). ‘Biology and Evolution of Crocodylians.’ (CSIRO Publishing: Melbourne, Vic., Australia.)

Hamada, J.-I., Yamanaka, M. D., Matsumoto, J., Fukao, S., Winarso, P. A., and Sribimawati, T. (2002). Spatial and temporal variations of the rainy season over Indonesia and their link to ENSO. Journal of the Meteorological Society of Japan 80, 285–310.
Spatial and temporal variations of the rainy season over Indonesia and their link to ENSO.Crossref | GoogleScholarGoogle Scholar |

Hollands, M. (1982). The status of crocodile populations in Papua New Guinea. In ‘Crocodiles, Proceedings of the 6th Working Meeting of the Crocodile Specialist Group, Victoria Falls, Zimbabwe and St Lucia Estuary’, 19–20 September 1982, Saint Lucia Estuary, South Africa. pp. 1–23. (IUCN: Gland, Switzerland.)

Kayat, Saragih, G. S., Hadi, D. S., Prasetyo, B. D., and Hidayat, O. (2016). Kajian Habitat Dan Populasi Buaya Di Wilayah Provinsi NTT. Konservasi Keanekaragaman Hayati Untuk Biosecurity, Bioprospecting, Jasa Lingkungan Dan Restorasi, Kupang, NTT, Indonesia.

Letnic, M., and Connors, G. (2006). Changes in the distribution and abundance of saltwater crocodiles (Crocodylus porosus) in the upstream freshwater reaches of rivers in the Northern Territory, Australia. Wildlife Research 33, 529–538.
Changes in the distribution and abundance of saltwater crocodiles (Crocodylus porosus) in the upstream freshwater reaches of rivers in the Northern Territory, Australia.Crossref | GoogleScholarGoogle Scholar |

Mertens, R. (1930). Die Amphibien und Reptilien der Inseln Bali, Lombok, Sumbawa und Flores (Beitrage zur Fauna der Kleinen Sunda-Inseln, 1). Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft 42, 115–344.

Oleh (2018). Buaya Kembaran Manusia di Masalembu Dianggap Biasa. Inilah, 25 August 2018. Available at https://inilah.com/news/2476091/buaya-kembaran-manusia-di-masalembu-dianggap-biasa [Verified 9 March 2020].

Pooley, S. (2015). Using predator attack data to save lives, human and crocodilian. Oryx 49, 581–583.
Using predator attack data to save lives, human and crocodilian.Crossref | GoogleScholarGoogle Scholar |

Pooley, S. (2018). Stay a long while, crocodile: mitigating human–crocodylian conflicts. In ‘Crocodiles, Proceedings of the 25th Meeting of the IUCN-SSC Crocodile Specialist Group’, 7–10 May 2018, Santa Fe, Argentina. pp. 238–242. (IUCN: Gland, Switzerland.)

Sideleau, B. (2015). Recent reports of saltwater crocodiles within East Java and Bali provinces in Indonesia. Crocodile Specialist Group Newsletter 34, 35–37.

Sideleau, B. M., Edyvane, K. S., and Britton, A. R. C. (2017). An analysis of recent saltwater crocodile (Crocodylus porosus) attacks in Timor-Leste and consequences for management and conservation. Marine and Freshwater Research 68, 801–809.
An analysis of recent saltwater crocodile (Crocodylus porosus) attacks in Timor-Leste and consequences for management and conservation.Crossref | GoogleScholarGoogle Scholar |

Supit, V. (2018). Masyarakat Manggarai Barat Tidak Takut Buaya Lagi, Ternyata Ini Penyebabnya. Infonawacita, 4 May 2018. Available at https://infonawacita.com/masyarakat-manggarai-barat-tidak-takut-buaya-lagi-ternyata-ini-penyebabnya/ [Verified 19 January 2019].

The Straits Times (2019). Killer crocodiles: why are humans being attacked in Timor-Leste? The Straits Times 29 November 2019. Available at https://www.straitstimes.com/asia/australianz/killer-crocodiles-why-are-more-humans-being-attacked-in-east-timor [Verified 9 March 2020].

Wijeratne, S., Pattiaratchi, C., and Proctor, R. (2018). Estimates of surface and subsurface boundary current transport around Australia. Journal of Geophysical Research – Oceans 123, 3444–3466.
Estimates of surface and subsurface boundary current transport around Australia.Crossref | GoogleScholarGoogle Scholar |