Dispersal and dive patterns in gravid leatherback turtles during the nesting season in French Guiana
Dispersal and dive patterns in gravid leatherback turtles during the nesting season in French Guiana
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DOI：
10.3354/meps338233
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发表时间：
2007-01-01
影响因子：
2.5
通讯作者：
Georges, Jean-Yves
中科院分区：
文献类型：
--
作者：
Fossette, Sabrina;Ferraroli, Sandra;Georges, Jean-Yves
我们提出了第一个结合分析的潜水行为和扩散数据收集妊娠棱皮龟在3个连续的筑巢季节在法属圭亚那。总共有23只海龟安装了Argos卫星发射器，16只海龟（包括6只同时被卫星跟踪的海龟）安装了电子时间深度记录器，记录单个嵌套间隔，即2个连续产卵位置之间的时间深度。棱皮龟分散在大陆架上-从沿海区到大陆架断裂-并在法属圭亚那和邻国苏里南的沃茨移动了546.2 +/- 154.1 km（平均SD）。他们大多进行浅（9.4 +/- 9.2米）和短（4.4 +/- 3.4分钟）潜水，轻微的昼夜模式。当它们远离海岸时，它们潜得更深，这表明它们主要是沿着海底移动的。产卵间隔可分为2个阶段：第一阶段包括海龟在海上度过的75%的时间，在此期间，它们平均潜水47 min h（-1），而第二阶段的特点是随着海龟返回海岸，潜水努力更低，变化更大。棱皮龟的长期运动和潜水形状的精细分析表明，在法属圭亚那，棱皮龟可能会在嵌套间隔期间进食，可能是为了补偿与繁殖相关的能量成本。因此，这一极度濒危物种面临着与大陆架上的当地渔业相互作用的高风险。
We present the first combined analysis of diving behaviour and dispersal data collected from gravid leatherback turtles during 3 consecutive nesting seasons in French Guiana. In total, 23 turtles were fitted with Argos satellite transmitters and 16 individuals (including 6 that were concurrently satellite-tracked) were equipped with an electronic time-depth recorder for single inter-nesting intervals, i.e. between 2 consecutive ovi-positions. The leatherbacks dispersed over the continental shelf -from the coastal zone to the shelf break-and moved over 546.2 +/- 154.1 km (mean SD) in waters of French Guiana and neighbouring Suriname. They mostly performed shallow (9.4 +/- 9.2 m) and short (4.4 +/- 3.4 min) dives with a slight diurnal pattern. They dived deeper as they moved away from the coast, suggesting that they were predominantly following the seabed. Inter-nesting intervals could be divided into 2 phases: the first comprised 75 % of the time turtles spent at sea, during which they dived on average 47 min h(-1), while the second was characterised by lower and more variable diving effort as the turtles returned to shore. The extended movements of leatherbacks and the fine analysis of dive shapes suggest that, in French Guiana, leatherbacks may feed during the inter-nesting interval, probably to compensate for the energy costs associated with reproduction. Consequently, this critically endangered species is exposed to a high risk of interaction with local fisheries over the continental shelf.