Home range and movements of radio-tracked estuarine crocodiles (Crocodylus porosus) within a non-tidal waterhole
Home range and movements of radio-tracked estuarine crocodiles (Crocodylus porosus) within a non-tidal waterhole
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DOI：
10.1071/wr06116
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发表时间：
2008-01-01
影响因子：
1.9
通讯作者：
Grigg, Gordon C.
中科院分区：
文献类型：
--
作者：
Brien, Matthew L.;Read, Mark A.;Grigg, Gordon C.
在2003-04年旱季末/雨季中期和随后的旱季（2004年），我们在昆士兰北部莱克菲尔德国家公园的一个无潮汐水坑中对5只雄性和8只雌性河口鳄（Crocodylus porosus）进行了无线电追踪。旱季/中湿季后期，个体鳄鱼的活动范围（河道面积）（RCA） （10.64 +/- 2.86 ha）大于旱季（3.20 +/- 1.02 ha）；旱季/中湿季后期，雄性鳄鱼的活动范围（23.89 +/- 2.36 ha）大于雌性鳄鱼（5.94 +/- 1.34 ha）。在旱季，雌雄间的活动范围无明显差异。在旱季后期或雨季中期，成年雄性经常沿着水坑长途跋涉，而雌性则较少移动。在旱季，它们的活动模式变化很大，没有明显的性别差异。所有鳄鱼在下午晚些时候（1500-1800时）至午夜最活跃。个别家庭范围（RCA）在干季后期/湿季中期相当重叠。三只成年雄性的家范围重叠的程度，以及它们擦肩而过或彼此靠近的次数，尤其引人注目。尽管人们普遍认为雄性鳄鱼具有高度的领土意识，但之前的研究对野生河口鳄鱼的领土意识程度得出了相互矛盾的结论。研究结果表明，在地理上受限制的非潮汐淡水系统中，大型成年雄性河口鳄没有很强的领土意识。
We radio-tracked five male and eight female estuarine crocodiles (Crocodylus porosus) in a non-tidal water-hole in Lakefield National Park in northern Queensland during the late dry/mid-wet season (2003-04) and the following dry season (2004). Individual crocodiles occupied larger home ranges (River Channel Areas (RCA) during the late dry/midwet season (10.64 +/- 2.86 ha) than in the dry season (3.20 +/- 1.02 ha), and males occupied larger home ranges (23.89 +/- 2.36 ha) than females (5.94 +/- 1.34 ha) during the late dry/mid-wet season. There were no obvious differences in home range between sexes during the dry season. During the late dry/mid-wet season, adult males often travelled long distances along the waterhole while females moved less. During the dry season, movement patterns were quite variable, with no clear difference between sexes. All crocodiles were most active from late afternoon (1500-1800 hours) until midnight. Individual home ranges (RCA) overlapped considerably during the late dry/mid-wet season. The extent of home-range overlap between three adult males and the number of times they either passed each other or were located near each other was particularly striking. Previous research has come to conflicting conclusions about the extent of territoriality in wild estuarine crocodiles, although it has been widely believed that males are highly territorial. The findings imply that large adult male estuarine crocodiles are not highly territorial in non-tidal freshwater systems that are geographically confined.