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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spring habitat use by stocked one year old European sturgeon Acipenser sturio in the freshwater-oligohaline area of the Gironde estuary
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Spring habitat use by stocked one year old European sturgeon Acipenser sturio in the freshwater-oligohaline area of the Gironde estuary

机译：吉伦特河口淡水-低盐度地区放养的一年生欧洲European鱼Acipenser sturio在春季栖息地的使用

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Post release habitat selection was studied on forty eight 10-month-old hatchery reared European sturgeon (mean fork length 31.0 cm +/- 3.0) in the tidal part of their native catchment using acoustic telemetry. Most of the fish reached the oligohaline estuary within 2-4 days (70 km downstream the release site). Seventy four percent of the fish migrated rapidly downstream of the estuary into mesohaline waters while 26% selected habitat in the freshwater/oligohaline part of the estuary based on their linearity and residency indices. We focused on individual habitat use of these fish. The home range size (HR) was calculated using two methods: the kernel utilization distribution (KUD) which is driven by the maximum detection location density, and the Brownian Bridge (BB) approach which allows the time component of the trajectory path to be taken into account. The average 50% HR KUD was 5.6 +/- 2.7 km(2) (range 1.1 -10.3 km(2)) and it was estimated to be 6 times larger using the 50% HR BB method (average reaching 31.9 +/- 20.7 km(2), range 5.2-77.8 km(2)). Habitat characterization (available prey, substrate and depth) in the studied area was described and the Ivlev electivity index was calculated using the habitat within the 50% HR BB for each individual. Despite the spatial use of different core areas among the fish tagged, we observed a convergence in habitat preference. For substrates, sturgeons showed avoidance of gravel and large rocks as well as fine and medium gravel. There was a significant preference for sand, silts and clay. For depth, they exhibited a preference firstly for the 5-8 m depth range and secondly for the 2-5 m range, a strong avoidance of depth range 8-20 m and a slight avoidance of shallow (0-2 m) and intertidal areas. For prey, individual variability was high. The most homogenous results were found for annelid polychaeta, with a slight preference for areas with this group of preys which,are abundant in the saline estuary. For some individuals, a preference for areas with crustacea or nematodea and avoidance for areas with mollusks, insects or oligochaeta occured. We explain our results in light of foraging behavior and adaptation to the wild environment after captivity.
机译：使用声学遥测技术，在原生集水区潮汐部分的四十只10个月大孵化场孵化的欧洲European鱼（平均叉长31.0 cm +/- 3.0）上研究了释放后的栖息地选择。大部分鱼在2-4天之内（在放水点下游70公里处）到达了盐卤河口。 74％的鱼在河口下游迅速迁移到中卤水中，而26％的鱼类根据其线性和居住指数选择了河口淡水/低盐部分的栖息地。我们专注于这些鱼的个体栖息地使用。使用两种方法来计算原始范围大小（HR）：由最大检测位置密度驱动的内核利用率分布（KUD），以及允许采用轨迹路径的时间分量的布朗桥（BB）方法考虑在内。 50％HR KUD的平均值为5.6 +/- 2.7 km（2）（范围1.1 -10.3 km（2）），使用50％HR BB方法估计是其大6倍（平均达到31.9 +/- 20.7 km（2），范围为5.2-77.8 km（2））。描述了研究区域中的栖息地特征（可用的猎物，底物和深度），并使用每个人的50％HR BB内的栖息地计算了Ivlev选择性指数。尽管在标记鱼中不同核心区域在空间上的使用，我们观察到栖息地偏好的趋同。对于底物，st鱼表现出避开了砾石和大块岩石以及中细砾石。人们非常喜欢沙，淤泥和粘土。对于深度，他们首先表现出对5-8 m深度范围的偏好，其次表现出对2-5 m范围的偏好，强烈避开了8-20 m的深度范围，略微避开了浅水（0-2 m）和潮间带地区。对于猎物，个体变异性很高。圆环类多壳动物的发现最均匀，对咸水河口丰富的这类猎物区域略有偏爱。对于某些人来说，偏爱甲壳类或线虫类的区域，而避开了软体动物，昆虫或寡头类的区域。我们根据人工饲养后的觅食行为和对野生环境的适应性来解释我们的结果。

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