Establishing mating systems by microsatellite analysis in declining saltwater crocodile (Crocodylus porosus) hatchling production at Edward River Crocodile Farm (Nth. Queensland)

Jamerlan, Mona Lisa

doi:10.14264/uql.2020.376

Cited by 2 publications

(1 citation statement)

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“…C. porosus are thought to have a polygynous mating system where dominant males mate with multiple females (Lang 1987). However, multiple paternity has been demonstrated in A. mississippiensis (Davis et al 2001) and, more recently, genetic studies have found evidence of multiple paternity in captive C. porosus (Jamerlan 2003). Ord River females in this study occupied small sections of river from May to October, which included part of the courtship and mating season.…”

Section: Movements Territoriality and Mating Systems Of Malesmentioning

confidence: 60%

Movements and home ranges of radio-tracked Crocodylus porosus in the Cambridge Gulf region of Western Australia

Kay¹

2004

Wildl. Res.

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VHF radio-tags were attached to 16 estuarine crocodiles that were tracked between October 2001 and May 2003. Male (n = 12) and female (n = 4) crocodiles exhibited distinctly different patterns of movement. Females occupied a small core linear range (1.3 ± 0.9 km) on the main river channel during the dry season and moved up to 62 km to nesting habitat during the wet season, returning to the same core area the following dry season. They occasionally made excursions away from their core areas during the dry season. Males moved considerable distances along the Ord River throughout the year. The largest range recorded was 87 km for a 2.5-m juvenile male. However, ranges of males did not appear to be related to body size, with the largest two ranges being recorded for the smallest (2.5 m) and largest (4.3 m) males tagged. Rates of movement of males did not differ significantly between three size classes of males but there were significant seasonal differences, with the highest mean rates of movement occurring during the summer wet season (4.0 ± 5.4 km day–1). However, males were quite mobile during the dry season and the highest rate of movement detected was 23.3 km day–1 for a 4.3-m male at the end of July. The highest rate of sustained movement was 9.8 km day–1 for a translocated 2.6-m juvenile male, which travelled 118 km in 12 days to return to the area of its capture. Neither males nor females showed exclusive habitat preferences for any of four broad riverine habitats identified on the Ord River. However, the three largest males had activity centres that they returned to frequently despite numerous excursions throughout the year, both up- and downriver. Males had substantial range overlaps with no obvious spatial partitioning, suggesting that territoriality is not an important behavioural characteristic of free-ranging male crocodiles along the Ord River.

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Section: Movements Territoriality and Mating Systems Of Malesmentioning

confidence: 60%

Movements and home ranges of radio-tracked Crocodylus porosus in the Cambridge Gulf region of Western Australia

Kay¹

2004

Wildl. Res.

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Human-Crocodile Conflicts in Sarawak, Malaysian Borneo: An analysis of crocodile attacks from 2000 until 2020

Gani

Hassan

Tisen

et al. 2022

International Journal of Biology and Biomedical Engineering

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Crocodiles have caused a relatively high number of fatalities towards local people in Sarawak, a Malaysian state in Borneo. However, they have important cultural values and are well respected by the riverine communities in the state. The objective of this study is to determine the patterns of human-crocodile conflict in Sarawak which could help in managing the problems between crocodile and human. Information on crocodile attacks were collected from multiple sources including records kept by local authority, media or CrocBITE database. Over a 21 years period (year 2000-2020), the record attacks (n=164) showed a balance between fatal and non-fatal cases. Most common victims in Sarawak were male (86.6%) and adults from the age of 31 to 40 years old (20.7%). The attacks occurred more during the daylight (59.4%), with the peak time for crocodile attacks was approximately between 1800 to 2359 hours (33.3%). Crocodile attacks occur slightly more during the wet season, from October to March (54.0%), with the highest one recorded in March (16.8%). Fishing (26.2%) and bathing (22.0%) in the rivers possess the highest risk of crocodile attack, suggesting that crocodiles are more likely to attack when the victim is in the water. The findings imply that crocodiles' attack pattern in Sarawak is associated with the people’s activities pattern. There is a need to update the database on crocodile attacks in Sarawak on -real time basis as this will facilitate the relevant agencies in formulating the strategies to reduce the number of crocodile attacks and ensuring the safety of the riverine communities.

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Establishing mating systems by microsatellite analysis in declining saltwater crocodile (Crocodylus porosus) hatchling production at Edward River Crocodile Farm (Nth. Queensland)

Cited by 2 publications

References 0 publications

Movements and home ranges of radio-tracked Crocodylus porosus in the Cambridge Gulf region of Western Australia

Movements and home ranges of radio-tracked Crocodylus porosus in the Cambridge Gulf region of Western Australia

Human-Crocodile Conflicts in Sarawak, Malaysian Borneo: An analysis of crocodile attacks from 2000 until 2020

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