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首页> 外文期刊>Marine ecology progress series >Characterizing Pacific halibut movement and habitat in a Marine Protected Area using net squared displacement analysis methods
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Characterizing Pacific halibut movement and habitat in a Marine Protected Area using net squared displacement analysis methods

机译：使用净平方位移分析方法表征海洋保护区内太平洋大比目鱼的运动和栖息地

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We characterized small-scale movement patterns and habitat of acoustic-tagged adult (68 to 220 cm total length) female Pacific halibut during summer and fall in Glacier Bay National Park, Alaska, a marine protected area (MPA). We used net squared displacement analysis methods to identify 2 movement states, characterize individual dispersal patterns, and relate habitat variables to movement scales. Movement states identified for 32 of 43 halibut consisted of (1) a non-dispersive 'residential' movement state (n = 27 fish), where movement was restricted to an average movement radius of 401.3 m (95% CI 312.2-515.9 m) over a median observation period of 58 d, and (2) a 'dispersive' movement state (n = 15 fish), where movements of up to 18 km occurred over a median observation period of 27 d. Some fish (n = 10) exhibited both movement states. Individual fish demonstrated primarily non-random dispersal patterns including home range (n = 17), site fidelity (return to previously occupied locations following forays, n = 6), and shifted home ranges (n = 5). However, we also observed a random dispersal pattern (n = 4) with an estimated mean ± SE diffusion rate of 0.9 ± 0.05 km~2 d~(-1). Home range size increased with depth but not fish size. Home range locations were associated with heterogeneous habitat, intermediate tidal velocities, and depths ＜100 m. Observations of non-dispersive movement patterns, relatively small home ranges, and site fidelity for adult females suggest that MPAs such as Glacier Bay may have utility for conservation of Pacific halibut broodstock.
机译：我们在夏季和秋季在阿拉斯加海洋保护区（MPA）的冰川湾国家公园中，对带有声学标签的成年雌性大比目鱼（总长68至220 cm）雌性大比目鱼的小规模运动模式和栖息地进行了表征。我们使用净平方位移分析方法来识别2种运动状态，表征各个散布模式，并将栖息地变量与运动尺度相关联。为43个大比目鱼中的32个确定的运动状态包括（1）一种非分散的“居住”运动状态（n = 27条鱼），其中运动被限制为平均运动半径401.3 m（95％CI 312.2-515.9 m）在58 d的中值观测期内，以及（2）“分散”运动状态（n = 15条鱼），其中在27 d的中值观测期内发生了长达18 km的运动。一些鱼（n = 10）表现出两种运动状态。个别鱼主要表现出非随机散布模式，包括居家范围（n = 17），地点保真度（在突袭后返回先前占据的位置，n = 6）和居家范围偏移（n = 5）。但是，我们还观察到了随机分散模式（n = 4），估计的平均±SE扩散速率为0.9±0.05 km〜2 d〜（-1）。家庭范围的大小随深度而增加，但不随鱼类的大小而增加。家庭范围的位置与生境的异质性，潮汐的中间速度和深度＜100 m有关。对成年雌性的非分散运动方式，相对较小的栖息地范围和位置保真度的观察表明，MPA（例如冰川湾）可能对太平洋大比目鱼亲鱼的保护具有实用性。

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