Status of Siamese Crocodile (<i>Crocodylus siamensis</i>) Schneider, 1801 (Reptilia: Crocodylia) in Laos

Bezuijen, Mark R.; Cox, Jack H.; Thorbjarnarson, John B.; Phothitay, C.; Hedemark, Michael; Rasphone, Akchousanh

doi:10.1670/11-157

Cited by 19 publications

(16 citation statements)

References 14 publications

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“…Tracks and traces of modern crocodylians are of considerable use in field research into ecology, conservation biology, and management of these big reptiles (cf. Riley and Huchzermeyer, 1999;Platt et al, 1990Platt et al, , 2006Platt et al, , 2009Wilkinson and Rice, 2000;Oliveros et al, 2006;Simpson, 2006;Buden and Haglelgam, 2010;Chang et al, 2012Chang et al, , 2015Gómez Velasco, F. 2012;Bezuijen et al, 2013;Stuart and Stuart, 2013;Sam et al, 2015). Comparisons of fossil trackways of quadrupedal archosaurs besides crocodylians (e.g.…”

Section: Introductionmentioning

confidence: 99%

Trackways of the American Crocodile (Crocodylus acutus) in Northwestern Costa Rica: Implications for Crocodylian Ichnology

Farlow

Robinson

Kumagai

et al. 2017

Ichnos

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Section: Introductionmentioning

confidence: 99%

Trackways of the American Crocodile (Crocodylus acutus) in Northwestern Costa Rica: Implications for Crocodylian Ichnology

Farlow

Robinson

Kumagai

et al. 2017

Ichnos

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“…Once widespread across Southeast Asia, C . siamensis is now restricted to a few relict areas comprising only a fraction of its historical range (Simpson and Bezuijen, ; Bezuijen et al ., ). Despite decades of conservation effort by the IUCN CSG, the status of wild populations has declined much further (Webb, ).…”

Section: Discussionmentioning

confidence: 99%

“…siamensis , correlative habitat suitability models (HSMs) were performed based on 79 species occurrence records and a set of 10 satellite‐derived environmental predictors with a spatial resolution of 1 km. Species occurrence records (Figure ) were compiled from the authors’ own field research (NB, PG), scientific papers (Thuok and Tana, ; Nabhitabhata et al ., ; Platt et al ., , , ; Polet, ; Kurniati et al ., ; Simpson et al ., ; Bezuijen et al ., , , ; Nguyen et al ., ; Oum et al ., ; Getpech, ; Kanwatanakid‐Savini et al ., ), and online databases (HerpNet, ; GBIF, ). The resulting dataset was filtered by expert opinion to remove unreliable, outdated and imprecise geographical locations from the dataset (Kamino et al ., ).…”

Section: Methodsmentioning

confidence: 97%

“…The species inhabits a wide range of lotic and lentic freshwater habitats such as slow‐moving rivers, streams, oxbow lakes, permanent and seasonal lakes covered with floating vegetation, as well as marshes and swamps, predominantly to an altitude of 730 m a.s.l. (above sea level) (Smith, ; Platt et al ., , ; Daltry et al ., ; Simpson et al ., , ; Bezuijen et al ., , ). Although the species was described more than 200 years ago, there is hardly any information on its ecology and natural history (Simpson et al ., ; Bezuijen, ).…”

Section: Introductionmentioning

confidence: 97%

“…Although in the past C . siamensis was distributed all over mainland Southeast Asia and parts of Indonesia, the few remnant wild populations today are restricted to remote spots in southern and north‐eastern Cambodia, Lao PDR, and eastern Kalimantan in Indonesia (Cox et al ., ; Ross et al ., ; Daltry and Chheang, ; Stuart and Platt, ; Platt et al ., , , ; Daltry et al ., ; Temsiripong, ; Cox, ; Simpson and Han, ; Kurniati et al ., ; Simpson et al ., , ; Timmins, ; Bezuijen et al ., , ). Apart from these sites, C .…”

Section: Introductionmentioning

confidence: 99%

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Habitat suitability, coverage by protected areas and population connectivity for the Siamese crocodile Crocodylus siamensis Schneider, 1801

Ihlow

Bonke

Hartmann

et al. 2014

Aquatic Conservation

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With estimates of fewer than 1000 mature individuals in the wild, the critically endangered Siamese crocodile, Crocodylus siamensis Schneider, 1801, is one of the least known and at the same time most threatened crocodilian species in the world. Populations have already been depleted to approximately 20% of their former size with habitat destruction, alterations, and loss being the main drivers of population declines. Habitat suitability models were computed using a combination of bioclimatic and remote sensing variables as environmental predictors to evaluate habitat suitability and coverage by designated protected areas across the species’ distributional range. In addition, population connectivity as well as current and future habitat fragmentation through dam construction was assessed by performing population connectivity models. Habitat suitability models show the spatial extent of suitable habitat to be high (46%), although only a small proportion is covered by designated reserves (11%). Population connectivity models showed remnant populations to be highly fragmented. Considering habitat suitability, coverage of reserves and population connectivity the lower Mekong River Basin stretching from the Xe Champhon and Xe Xangxoy rivers in Lao PDR to the Srepok and Sekong rivers in eastern Cambodia seem to be particularly important for future conservation prioritization for C. siamensis. The presently established protected area network is unsatisfactory in terms of size and population connectivity and needs to be significantly improved to successfully sustain viable populations of the critically endangered Siamese crocodile in the future. Copyright © 2014 John Wiley & Sons, Ltd.

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Release of critically endangered crocodiles: Development and application of a food web approach to determine suitability of release habitat

McInerney

Shackleton

Rees

et al. 2019

Aquatic Conservation

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The Siamese Crocodile (Crocodylus siamensis) is a critically endangered medium‐size crocodilian endemic to Southeast Asia. Extirpated from much of its natural range, conservation efforts in the Cardamom Mountains of Cambodia include the release of captive‐reared juveniles and sub‐adults into river reaches known to support adult C. siamensis populations. Despite conservation concerns, the biology of wild C. siamensis is not well studied and the ecology of ecosystems at release locations is poorly understood. Fish are thought to comprise a major component of the diet of C. siamensis. Here, the aim was to characterize fish communities within three potential C. siamensis release locations, focusing on community composition, density, size class structure and food web dynamics. The survey sites varied in both C. siamensis density and human fishing pressure, and the results are interpreted in light of these drivers. Genomic interrogation of fishes of the Cardamom Mountains distinguished 13 distinct fish species, contributing to genetic databases and adding to the documented taxon list for the region. The presence of two previously unconfirmed fish genera in the region is confirmed. The first estimates of fish density, biomass and size class distribution for three rivers in the Cardamom Mountains are provided. The three potential C. siamensis release reaches that were sampled showed clear differences in fish community composition, structural and trophic dynamics. Fish density and biomass were highest in the high‐density C. siamensis survey reach and lowest in the high human fishing pressure reach. Survey reaches with food webs that were more reliant on autochonously driven food webs supported higher densities and biomass of fish. These results have important implications for future C. siamensis conservation efforts in Cambodia and contribute valuable ecological information on a relatively unexplored region.

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Status of Siamese Crocodile (Crocodylus siamensis) Schneider, 1801 (Reptilia: Crocodylia) in Laos

Cited by 19 publications

References 14 publications

Trackways of the American Crocodile (Crocodylus acutus) in Northwestern Costa Rica: Implications for Crocodylian Ichnology

Trackways of the American Crocodile (Crocodylus acutus) in Northwestern Costa Rica: Implications for Crocodylian Ichnology

Habitat suitability, coverage by protected areas and population connectivity for the Siamese crocodile Crocodylus siamensis Schneider, 1801

Release of critically endangered crocodiles: Development and application of a food web approach to determine suitability of release habitat

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