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首页> 外文期刊>Estuarine Coastal and Shelf Science >Latitudinal Gradients In Growth And Spawning Of Sea Bass, Dicentrarchus Labrax, And Their Relationship With Temperature And Photoperiod
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Latitudinal Gradients In Growth And Spawning Of Sea Bass, Dicentrarchus Labrax, And Their Relationship With Temperature And Photoperiod

机译：鲈鱼，鲈鱼生长和产卵的纬度梯度及其与温度和光周期的关系

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摘要

O-group Sea bass, Dicentrarchus labrax, were captured in four estuarine nursery areas along the Portuguese coast, during the spring and summer of 2005. This coast has a North-South orientation which means that it is particularly suited for the investigation of latitudinal trends. Growth and hatch dates were estimated through otolith daily increment analysis. A clear latitudinal gradient in growth rates was detected. D. labrax mean growth rates were 0.48 mm d~(-1), 0.51 mm d~(-1), 0.56 mm d~(-1) and 0.61 mm d~(-1), from the Ria de Aveiro, the Mondego estuary, the Tagus estuary and the Mira estuary, respectively. A latitudinal gradient also existed in the spawning season of this species, particularly concerning its onset, which occurred earlier in the South. Analysis of sea surface temperature data from the adjacent coastal waters showed that spawning is not triggered by an increase in temperature, as has been argued in other coastal areas at higher latitudes. Photoperiod played a crucial role in the determination of spawning season at the Portuguese coast latitudinal range. The impact of future climate change on the observed patterns is also discussed.
机译：O族鲈鱼Dicentrarchus labrax于2005年春季和夏季在葡萄牙海岸的四个河口苗圃地区被捕获。该海岸具有南北方向，这意味着它特别适合于调查纬向趋势。生长和孵化日期通过耳石每日增量分析估算。检测到明显的纬度梯度增长率。来自巴西利亚（Ria de Aveiro）的D. labrax平均生长速率分别为0.48 mm d〜（-1），0.51 mm d〜（-1），0.56 mm d〜（-1）和0.61 mm d〜（-1）。蒙德戈河口，塔霍河口和米拉河口。该物种的产卵季节也存在纬度梯度，特别是在南部较早发生时。对来自邻近沿海水域的海面温度数据的分析表明，产卵不是由温度升高触发的，正如在其他纬度较高的沿海地区所主张的那样。在确定葡萄牙沿海纬度范围产卵季节方面，光周期起着至关重要的作用。还讨论了未来气候变化对观测模式的影响。

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