Freshwater Crocodiles of Kalimantan (Indonesian Borneo)

Cox, Jack H.; Frazier, Raelynn; Maturbongs, Rudi A.

doi:10.2307/1447164

Cited by 7 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whether this is a distinct species is debated (Ross, 1992;Cox et al, 1993;Das and Charles, 2000;Gratten, 2003), but it can be distinguished from the other species of Crocodylus (C. porosus and C. siamensis) otherwise known historically from Borneo (C.A.B., pers. observ.…”

Section: Methodsmentioning

confidence: 99%

Sexual Size Dimorphism and Allometric Growth of Morelet's Crocodiles in Captivity

Barrios-Quiroz

Casas-Andreu²,

Escobedo-Galván

2012

Zoological Science

View full text Add to dashboard Cite

Few studies have conducted morphological analyses of crocodilians, and little information exists on differences between size-classes and sexes in Neotropical crocodilians. In this study, we measured nine morphological traits in 121 captive Morelet's crocodiles Crocodylus moreletii (81 females and 40 males). Our results revealed that individuals < 2 m total length do not exhibit sexual dimorphism in morphometric characteristics. However, for crocodiles over 2 m in length, males were significantly larger than females in terms of dorsal-cranial length, cranial width, snout width and snout-ventral length. In general, morphological traits demonstrated a strongly significant relationship with total length at the smaller size class of 150-200 cm length. However, in the highest size class of 250-300 cm length (large adult males), morphological traits were no longer significantly related with total length. Male crocodiles demonstrated allometric growth of cranial morphology with significantly greater increase in cranial width, snout width, and mid-snout width relative to total length at higher size classes. Morphological dimorphism and allometric growth may be associated with adaptive strategies for reproductive success.

show abstract

Section: Methodsmentioning

confidence: 99%

Sexual Size Dimorphism and Allometric Growth of Morelet's Crocodiles in Captivity

Barrios-Quiroz

Casas-Andreu²,

Escobedo-Galván

2012

Zoological Science

View full text Add to dashboard Cite

show abstract

“…Furthermore, because of the osteoderms in its ventral scales, T. schlegelii was rarely if ever exploited commercially as a source of crocodile leather, so that support of research by the crocodile‐leather industry was limited, or incidental to studies of other species. However, by the mid‐1990s more information had come to light, primarily related to surveys of other crocodile species, especially the Salt‐water crocodile Crocodylus porosus in Borneo and Sumatra (Cox et al ., ; Bezuijen et al ., , ). In 1997, a research report from the Indonesian Institute of Sciences (Lembaga Ilmu Pengetahuan Indonesia: LIPI), Jakarta, and the Smithsonian Institution, Washington, DC, USA, on surveys of Siamese crocodile Crocodylus siamensis in Kalimantan, hinted that the Sunda gharial was much more widespread than had been previously thought (Bezuijen et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Conservation of the Sunda gharial Tomistoma schlegelii in Lake Mesangat, Indonesia

Stuebing

Sommerlad²,

Staniewicz

2014

International Zoo Yearbook

View full text Add to dashboard Cite

Although featured in many international zoo collections for decades, little was known about the natural history of Sunda gharial Tomistoma schlegelii until recently. Zoos rarely keep large individuals and breeding success has been low. As late as 1998, even though most conservationists regarded the conservation status of the species as Endangered, the reality was that over most of the range the actual status of the Sunda gharial was Data Deficient. Beginning with surveys of the species by international and local scientists in Indonesian Sumatra and, later, in Kalimantan, Indonesian Borneo, supported by the International Union for Conservation of Nature/Species Survival Commission Crocodile Specialist Group, more details on the broad distribution of this crocodilian came to light. Ironically, rediscovery of a large and healthy population of T. schlegelii in East Kalimantan arose from an oil‐palm company accessing the area to develop a site called Danau Mesangat. Subsequently through a cooperation agreement with the oil‐palm company's conservation department and a local foundation, a group of dedicated zoos in Europe and America, and the Tomistoma Task Force set up by the Crocodile Specialist Group, provided funding for three consecutive years of field studies by a research group. These studies investigated the ecology of T. schlegelii and of a sympatric population of the Critically Endangered Siamese crocodile Crocodylus siamensis. The role of the zoos, including their role in the development of the research programme, is described. Accounts are given of the characteristics of the Mesangat habitat, some new details about the distribution and abundance of Sunda gharial and Siamese crocodiles in the habitat, and information about reproduction in T. schlegelii. In summary, an overview of threats and suggestions for conservation actions needed at the Mesangat site are provided.

show abstract

“…According to Thorbjarnarson (1992), its existence in Indonesia is stated as being almost extinct. Cox et al(1993), conducted a study and found that C. siamensis still exists in Mesangat Lake, Muara Ancalong Sub-district, East Kutai District, East Kalimantan Province, Indonesia. Since Cox's discovery, Mesangat Lake was later included in the IUCN map as a habitat for Siamese crocodiles.…”

Section: Introductionmentioning

confidence: 99%

The potential of Mesangat Lake, East Kutai, Indonesia as an essential ecological area for habitat conservation of critically endangered Crocodylus siamensis

Sudrajat

Saleh

2019

Biodiversitas

View full text Add to dashboard Cite

Abstract. Sudrajat, Saleh HA. 2019. The potential of Mesangat Lake, East Kutai, Indonesia as an essential ecological area for habitat conservation of critically endangered Crocodylus siamensis. Biodiversitas 20: 3126-3133. The Siamese crocodile, Crocodylus siamensis, is one of the most threatened reptile species in the world with IUCN Red List status of Critically Endangered. This study aims to investigate and assess the biogeophysical conditions of Mesangat Lake area, Indonesia as an essential ecological area for C. siamensis conservation outside biodiversity conservation areas. Data was collected through direct survey using spotlight technique at night, tracking, observation and interviews with local fishermen. The results showed that the biogeophysical conditions of Mesangat Lake habitat in Long Balau, Loah Toh and Abang areas still support C. siamensis population which was marked by the presence of its nests and the occurrence of 17 individuals with sizes between 30 and 50 cm in length. Habitat conditions in the form of lake waters had depths between 30-110 cm, low currents, and covered with aquatic plant species for resting, nesting and basking, as well as contained sufficient diversity of fish and other prey. A nest was also found in the form of mound of plants measuring ± 45 cm high and ± 75 cm wide which contained 20 eggs with an average length of ± 8.45 cm, an average width of ± 4.9 cm. Potential factors that threaten C. siamensis habitat included siltation of water bodies caused by invasive weeds, over-exploitation of fishes and conversion of lake land into plantations and/or agriculture lands. Based on the results of this study, it can be stated that Mesangat Lake has the potential to be designated as an essential ecological area of C. siamensis habitat. Through this strategy, it is hoped that there will be good collaboration between local government and concession rights holders, NGOs and local communities to participate in the conservation of C. siamensis. In the area of the lake, zoning can be classified into areas of nesting, closed areas, playing and sunbathing, limited fishing, recreation.

show abstract

Freshwater Crocodiles of Kalimantan (Indonesian Borneo)

Cited by 7 publications

References 0 publications

Sexual Size Dimorphism and Allometric Growth of Morelet's Crocodiles in Captivity

Sexual Size Dimorphism and Allometric Growth of Morelet's Crocodiles in Captivity

Conservation of the Sunda gharial Tomistoma schlegelii in Lake Mesangat, Indonesia

The potential of Mesangat Lake, East Kutai, Indonesia as an essential ecological area for habitat conservation of critically endangered Crocodylus siamensis

Contact Info

Product

Resources

About