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首页> 外文期刊>Canadian Journal of Zoology >Activity-related constraints on overwintering young-of-the-year stripedbass (Morone saxatilis)
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Activity-related constraints on overwintering young-of-the-year stripedbass (Morone saxatilis)

机译：与活动相关的冬季无striped鲈越冬的限制（Mor​​one saxatilis）

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The importance of activity to overwintering fishes has received little attention. Activity imposes two constraints: maximum swimming speed limits habitats that can be occupied for short periods of time, while the metabolic cost of swimming limits the habitats that are suitable for long-term residence. We measured the energetic consequences of activity and maximum swimming speeds of young-of-the-year striped bass (Morone saxatilis), a species that overwinters in tidal estuaries. The energetic cost of swimming was determined from energy changes in unfed fish forced to swim at various speeds, while energy changes in fed fish provided a measure of their ability to offset swimming costs through feeding. In high-velocity treatments, mortality was size-dependent and appeared to be related to fatigue lather than to depletion of energy reserves. The energetic cost of swimming increased with swimming velocity, but fish increased food consumption and thereby met their metabolic needs. In a second experiment the thermal dependence of swimming capacity in winter-acclimated striped bass was measured. Swimming speeds increased with temperature, from .7 body lengths (BL)/s at 2 degreesC to 4.8 BL/s at 8 and 11 degreesC, but were considerably below observed flow velocities in the Hudson River, suggesting a need for behavioral or physical refuge from tidal currents. These results indicate the flexibility of energy budgets of overwintering fishes, allowing energetic stress to be minimized by reducing activity or elevating food-consumption rates when sufficient prey are available.
机译：活动对越冬鱼类的重要性几乎没有引起注意。活动受到两个限制：最大游泳速度限制了可以在短时间内被占用的栖息地，而游泳的代谢成本限制了适合长期居住的栖息地。我们测量了年幼的条纹鲈鱼（Morone saxatilis）的活动和最大游泳速度的能量后果，该鲈鱼在潮汐河口越冬。游泳的能量消耗取决于被迫以各种速度游泳的未喂食鱼的能量变化，而喂食鱼的能量变化提供了它们通过喂食来抵消游泳费用的能力的量度。在高速治疗中，死亡率与大小有关，并且似乎与疲劳而不是能量储备的消耗有关。游泳的能量消耗随着游泳速度的增加而增加，但是鱼类增加了食物的消耗，从而满足了他们的新陈代谢需求。在第二个实验中，测量了冬季适应的条纹鲈鱼游泳能力的热依赖性。游泳速度随着温度的升高而增加，从2摄氏度下的0.7体长（BL）/ s增至8摄氏度和11摄氏度下的4.8 BL / s，但远低于哈德逊河观测到的流速，这表明需要行为或身体庇护来自潮流。这些结果表明了越冬鱼类能量预算的灵活性，当有足够的猎物时，可以通过减少活动或提高食物消耗率来最大程度地减少精力充沛的压力。

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